S06 THC 560 Axera 5

(104)

SANDVIK TAMROCK SECOMA S.A.S19 avenue De Lattre-de-Tassigny - ZIB.P. 46 - 69881 MEYZIEU CedexTel : (33) 472 45 22 00 Fax : (33) 478 31 79 80

MAINTENANCE MANUAL

AXERA 5

THC560 DRILLING HYDRAULICS

04-03-2005 GP-RL-FL

(104) 04-03-2005 GP-RL-FLAXERA 5 THC 560 DRILLING HYDRAULICS


(104)04-03-2005 GP-RL-FL AXERA 5 THC 560 DRILLING HYDRAULICS


CONTENTS

1. GENERAL 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2. SAFETY 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3. CONTROLS OF THE THC 560 DRILLING SYSTEM 8. . . . . . . . . . . . . . . . . . . . . 3.1. Controls of the THC 560 drilling system, TB and B26 boom 8. . . . . 3.2. Controls of the THC 560 drilling system, B26NV boom 9. . . . . . . . . . 3.3. Common functions 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4. TB and B26 boom 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5. B26NV boom 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4. HYDRAULIC COMPONENTS 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.1. General 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2. Lay–out of the valve blocks 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.3. Percussion and feed control block 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.4. Anti–jamming and return automatics control block 25. . . . . . . . . . . . . 4.5. Rotation control block 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.6. Feed pressure control block 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.7. Rotation speed adjusting block 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.8. Impulse cylinders control block 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5. HYDRAULIC SYSTEM 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.1. Filtering of hydraulic fluid 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.2. Air filtering of hydraulic oil tank 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.3. Cooling of hydraulic system 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6. COMPONENTS 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7. OPERATION OF SYSTEM 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.1. Oil temperature of drilling 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.2. Reading diagrams 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.2.1. Valves 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.3. Free circulation 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.3.1. Rotation circuit 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.3.2. Percussion and feed circuits 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.4. Rotation, feed and percussion 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.4.1. Rotation 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.4.2. Feed 43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.4.3. Percussion 45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.5. Drilling 47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.5.1. Collaring 47. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.5.2. Drilling 49. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .



7.6. Anti–jamming automatics 51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.7. Flushing flow control (option) 53. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.7.1. General 53. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.7.2. Function 53. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.8. Impulse cylinder controlled return automatics 55. . . . . . . . . . . . . . . . . . 7.8.1. The function of the return automatics 56. . . . . . . . . . . . . . . . . . . . . . . . . . . 7.9. Manual control of fast feed 59. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

8. SPECIAL FUNCTIONS 61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.1. Threading 61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.2. Loosen the bit 63. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.3. Separate flushing 65. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.4. Using diesel engine for running rock drill 67. . . . . . . . . . . . . . . . . . . . . . 8.5. Optional controls 68. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9. ADJUSTMENTS OF HYDRAULIC COMPONENTS 69. . . . . . . . . . . . . . . . . . . . . 9.1. Adjusting percussion main valve 69. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.2. Adjustments of variable displacement pump (1) 70. . . . . . . . . . . . . . . . 9.3. Adjusting pilot control pressure 72. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.4. Adjusting the max. pressure of rotation circuit 73. . . . . . . . . . . . . . . . . 9.5. Adjusting anti–jamming pressure 74. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.6. Adjusting percussion half–power 76. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.7. Adjusting percussion full–power 77. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.8. Adjusting feed pressure 78. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.9. Adjusting feed pressure 78. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.10. Adjusting feed–percussion monitoring 79. . . . . . . . . . . . . . . . . . . . . . . . 9.11. Adjusting fast feed max. pressure 81. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.12. Adjusting fast feed max. speed 82. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.13. Adjusting rotation speed 83. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.14. Bleeding of the impulse cylinder block 84. . . . . . . . . . . . . . . . . . . . . . . . . 9.14.1. Adjusting the pressure switch 84. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.14.2. Bleeding of the impulse cylinders 85. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.15. Bleeding of the pressure switch (12) 85. . . . . . . . . . . . . . . . . . . . . . . . . . . 9.16. Adjusting percussion hour meter pressure switch 86. . . . . . . . . . . . . . 9.17. Adjustment of stabilizer pressure 87. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .



10. TROUBLESHOOTING 88. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.1. General 88. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.2. Pumps (1) and (50) do not rotate at all, or their speed is not

normal 88. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.3. Variable displacement pump (1) rotates normally, but the settings

of its regulator are not normal 89. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.3.1. Flow regulator (A) value deviates from the set value 22 bar 89. . . . . . . . 10.3.2. Pressure regulator (B) value deviates from the set value 225 bar 91. . . 10.4. Percussion not working at all 91. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.5. Percussion is on always when the powerpack or the diesel engine

is running 92. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.6. Percussion full–power max. pressure too high 92. . . . . . . . . . . . . . . . . 10.7. Percussion full–power max. pressure too low 93. . . . . . . . . . . . . . . . . . 10.8. Percussion half–power pressure too high 94. . . . . . . . . . . . . . . . . . . . . . 10.9. Percussion half–power pressure too low 95. . . . . . . . . . . . . . . . . . . . . . . 10.10. Feed not working at all (drilling) 95. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.11. Drilling feed pressure too low 96. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.12. Drilling feed pressure too high 97. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.13. Manually controlled fast feed not working 98. . . . . . . . . . . . . . . . . . . . . 10.14. Manually controlled fast feed too slow 99. . . . . . . . . . . . . . . . . . . . . . . . 10.15. Manually controlled fast feed too fast 99. . . . . . . . . . . . . . . . . . . . . . . . . 10.16. Rotation pressure too low 100. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.17. Rotation pressure too high during drilling 101. . . . . . . . . . . . . . . . . . . . . 10.18. Rotation speed regulation not working 101. . . . . . . . . . . . . . . . . . . . . . . . 10.19. Return automatics fast feed not working 102. . . . . . . . . . . . . . . . . . . . . . 10.20. Electric system troubleshooting 103. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.21. Main reference values (factory settings) for troubleshooting 104. . . .



1. GENERAL

These instructions describe the testing and adjusting procedures, and the operatingprinciple of the THC 560 drilling hydraulic system.

To clarify the operating principle in different situations, flowcharts with colour codesaccompany the explanations.

Tamrock Service is always willing to give advice and help in any service problems.

2. SAFETY

Always follow� ��

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3. CONTROLS OF THE THC 560 DRILLING SYSTEM

3.1. Controls of the THC 560 drilling system, TB and B26 boom

05 06 07 08

01 02 03 04

09

16

17

18

10 11 12 13 14

15

Rotation pressure gauge Rotation control lever

Percution pressure gauge Percussion control lever

Feed pressure gauge Feed control lever

Water pressure gauge Air / water flushing control lever

Boom lift and swing lever Fast feed control lever

Boom zoom and head rotation lever Feed force regulating knob

Feed tilt and swing lever Automatic return switch

Feed extention and divergence lever Power pack switch

Rotation speed control knob Emergency stop push button

01 10

02 11

03 12

04 13

05 14

06 15

07 16

08 17

09 18

04 01 02 030807060509

12 11 1015 14 1318 17 16



3.2. Controls of the THC 560 drilling system, B26NV boom

05 06 07 08

01 02 03 04

09

16

17

18

10 11 12 13 14

15

19

Rotation pressure gauge Percussion control lever

Percution pressure gauge Feed control lever

Feed pressure gauge Air / water flushing control lever

Water pressure gauge Fast feed control lever

Boom lift and swing lever Feed force regulating knob

Boom zoom and head rotation lever Automatic return switch

Feed tilt and swing lever Power pack switch

Feed extention and angle lever Emergency stop push button

Rotation speed control knob Divergence lever

Rotation control lever

01 11

02 12

03 13

04 14

05 15

06 16

07 17

08 18

09 19

10

04 01 02 030807060509

12 11 1015 14 1318 17 16

19



3.3. Common functions

Turn the switch into the START–position andrelease to start the powerpack.

Powerpack running.

Turn the switch into the O–position to stopthe powerpack.

Drilling without return–automatics selected.

Drilling with return–automatics selected.

Automatic return before reaching front limit.Turn the selector switch right and release itto middle position.



Push emergency stop button to stop thepowerpacks, the compressor and the water-pump



Push lever forward to rotating clockwise (threadopening).

Pull lever backwards to rotating counterclock-wise (drilling).

Push lever for full percussion (used to loosenthe bit).

Pull lever backwards to activate percussion indrilling.

Push lever forward to activate feed backwards.

Pull lever backwards to activate feed forward.



Push lever forward to activate air flushing.

Pull lever backwards to activate water flushing.

Push lever forward to activate fast feed back-wards.

Pull lever backwards to activate fast feed for-wards.



Turn clockwise to increase rotation speed.

Turn counterclockwise to decrease rotationspeed.

Turn clockwise to increase feed pressure.

Turn counterclockwise to decrease feed pres-sure.



3.4. TB and B26 boom

Boom swing left

Boom lifting

Boom lowering

Boom swing right

Boom head rotationcounterclockwise

Boom zoom in

Boom zoom out

Boom head rotationclockwise



Feed swing left

Feed tilt down

Feed tilt up

Feed swing right

Bolting cylinder out

Divergence down

Feed transfer forward

Feed transferbackwards

Bolting cylinder in

Divergence up



Push lever forward to close Pito jaws

Pull lever backwards to open Pito jaws

(OPTION)



3.5. B26NV boom

Boom swing left

Boom lifting

Boom lowering

Boom swing right

Boom head rotationcounterclockwise

Boom zoom in

Boom zoom out

Boom head rotationclockwise



Feed swing left

Feed tilt down

Feed tilt up

Feed swing right

Feed angle left

Feed transfer forward

Feed transferbackwards

Feed angle right



Push lever forward to divergence down

Pull lever backwards to divergence up



4. HYDRAULIC COMPONENTS

4.1. General

The return automatics system has been controlled by impulse cylinders.

Before any maintenance or adjusting operations, identify the construction of the returnautomatics (see the picture below).

HH SM

Impulse cylinders



4.2. Lay–out of the valve blocks

Main valve blocks :

- Percussion and feed control block- Anti jamming and return automatics control block- Rotation control block- Feed pressure control block- Impulse cylinders control block

These valve blocks are located on machine’s carrier, see following pages for details.



4.3. Percussion and feed control block

432

9

10 6

15

23

8

25

9M7

M9

M2

M1

M6

M2

M8

M3

16

A

136137

No Component Tightening torque[Nm] (for the cap)

2. Percussion line pressure compensator 200–215

6. Percussion half–power pressure relief valve 50

8. Feed / percussion monitoring valve 33,9

9. Orifice (percussion) –

10. Shuttle valve 33.9



23. Feed directional valve 22

25. Max. pressure relief valve for feed line A 40

43. Pilot pressure regulating valve 33.9

136. Pressure reducing and relieving valve for stabilizer pressure(option)

33.9

137. Control valve for stabilizer pressure (option) 33.9



42

5

2934

24

307

19

M3

M6

M2

M8

B

LS1

M4

LS2

X3

X4

X2X1

M5

A1

P5P1

T3

X6

X5

18


3. Percussion main valve 50

4. Percussion selector valve 33,9

5. Percussion pressure selector valve 33,9

7. Percussion max. pressure relief valve 33.9

18. Sequence valve 33.9

19. Non–return valve 33,9

24. Max. pressure relief valve for feed line B 40

29. Feed LS line selector valve 33.9

30. Fast feed max. pressure relief valve 33.9




4.4. Anti–jamming and return automatics control block

39 36 37 38 35

34

M1

M3

M2

Y47

No Component Tighteningtorque Nm

Coil tighten-ing torque Nm

34. Anti–jamming valve 8.9 –

35. Shuttle valve 33.9 –




39. Return automatics selector valve 33.9 6.8



4.5. Rotation control block

52. Pressure compensator53. Rotation directional valve55. Rotation max pressure relief valve56. Flow control valve57. Non–return valve

Tightening torques of valves

Valve number Tightening torque

55 45 Nm

57

2 11 : Entry element

2 : Controls element

3 : Locker plate

56

53

56

55

52

3



4.6. Feed pressure control block


20. Feed pressure regulating valve 33,9

32. Return circuit selector valve for feed LS line 33,9

44. Directional valve 33,9

4.7. Rotation speed adjusting block

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59. Rotation speed regulating valve 33,9

60. Shuttle valve 33,9

20

44

32



4.8. Impulse cylinders control block

123

125

124

126

127

118

119

120

121

T

P

MF

MR

R1

F1


118. Pressure relief valve (rear) 22

119. Pressure relief valve (front) 22

120. Orifice / impulse circuit (rear) 10

121. Orifice / impulse circuit (front) 10

123. Pressure switch (front) –

124. Non–return valve (front) 20

125. Pressure switch (rear) –

126. Non–return valve (rear) 20

127. Pressure regulator / relief valve 65



5. HYDRAULIC SYSTEM

5.1. Filtering of hydraulic fluid

The system uses pressure and return filtering. Pressure filtering is used in the pump (1)circuit only, but return flow filtering is common to both pumps (1 and 50).

Hose–mounted filter (112) with filtering capacity of 20 µm abs. is used for pressurefiltering. If the pressure difference over the filter rises over 2.5 bar, the indicator light H611on the indicator light panel goes on, indicating that the filter element should be replaced.The filtering unit body is also equipped with by–pass valve that opens if the pressuredifference exceeds 3.5 bar.

The return flow of both pumps passes through the return filter (113). The return filter ismounted on the tank. The filtering capacity of the return filter element is 10 µm abs. If thepressure difference over the filter rises higher than 2 bar, the indicator light H607 on theindicator light panel goes on, indicating that the filtering element should be replaced. Thefiltering unit body is also equipped with by–pass valve that opens if the pressure differenceexceeds 2.4 bar.

The manufacturer’s recommendation for the purity class of the system is 17/13 accordingto the ISO standard.

If the oil is cold (below +30°C), both pressure and return oil filtermonitoring are bypassed to avoid unnecessary alarms caused by thehigh viscosity of cold oil.

5.2. Air filtering of hydraulic oil tank

The hydraulic oil tank is also equipped with an air filter. Its filtering capacity is 5 �m. Thisfilter has no monitoring indicators but, to ensure the cleanness of hydraulic oil, it shouldbe replaced according to the service instructions.

5.3. Cooling of hydraulic system

The oil returning from the various actuators (except leakage oil) is gathered together incommon return line using a collector tube (115). From the collector tube (115) the return oilis led through the cooler (114) and the return oil filter (113) into the hydraulic oil tank (110).

The oil cooler (114) is always in operation when water flushing is on. The cooling capacityof the cooler can be increased by opening the ball valve (132) at the cooler.

The hydraulic system is also equipped with monitoring system for the hydraulic oiltemperature. The oil temperature in the tank is measured by sensor (111). Thistemperature sensor stops the powerpack if the temperature rises higher than +75C. Atthe same time, the signal light H610 in the warning light panel goes on.

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125123

124 126

127

129 130

121 120

TP

F1F2

MF MR R1

118

S80

S81

50

16

��

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15

2 3 9 7

10

428

6

5

4

2622

23

25

24

11

21

132114

115 1351

116

117

13

28

32

20

33102

103

101

100

31

14

6258

61

60

59

112FROM CARRIERCIRCUIT

39

38

37

363534

2930

19

43

137136

138

12

THE PRESSURE SWITCH OF THEPERCUSSIONHOUR METER

TO THE BOOMCONTROL (PI)

��

FROMTHEBOOMCONTROLVALVE

S126

SLX

IN

OUT

IN

OUT

OUT

IN

B IN

OUT

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44

A2/B2 K2/K4 A1/B1 T1/T3 T4

119

122

111

110

133

113R1

TO SHANK LU-BRICATION(ALTERNATIVE)

53

57

5552

56

5154

6. COMPONENTS Hydraulic system with impulse cylinder controlled return automatics

18

125123

124 126

127121 120

TP

F1F2

MF MR R1

118

S8

0

S8

1

50

16

15

2 3 9 7

10

428

6

5

4

2622

23

25

24

11

21

132114

1151

116

117

13

28

32

20

33102

103

101

100

31

14

62

58

61

60

59

112

FROM CARRIERCIRCUIT

39

38

37

363534

2930

19

43

137136

138

12

THE PRESSURESWITCH OF THEPERCUSSIONHOUR METER



S126

SLX

IN

OUT

IN

OUT

OUT

IN

BIN

OUT

44

A2/B2 K2/K4 A1/B1 T1/T3T4

119

122

111

110

133

113R1


5451

57

5352

56

55

135

129 130



1 Variable displacement pump Output for percussion, feed, boom hydraulics,and pilot control

2 Percussion line pressure compen-sator

Keeps percussion pressure constant, irrespective of variationsin input pressure

3 Percussion main valve Control oil flow to rock drill, controlled by percussion selectorvalve (4)

4 Percussion selector valve Opens and closes percussion main valve (3) according to pilotcontrol valve (14)

5 Percussion pressure selector valve Selects half or full power percussion

6 Percussion half–power pressurerelief valve

Determines pressure level for percussion half power

7 Percussion max. pressure reliefvalve

Determines percussion max. pressure

8 Feed/percussion monitoring valve Determines pressure difference between feed and percussion

9 Orifice Restricts oil flow in percussion LS line

10 Shuttle valve Directs percussion, feed, or boom LS signal to variable displ.pump

11 Percussion pressure gauge Indicates percussion line pressure

12 Pressure switch Switches on percussion hour meter

13 Percussion mechanism

14 Percussion pilot control valve Turns percussion on for drilling and thread–loosening

15 Shuttle valve Directs pressure from percussion pilot valve (14) to percussionselector valve (4)

16 Shuttle valve Directs pressure from percussion pilot valve (14) or feed pilotvalve (31) to percussion pressure selector valve (5)

18 Sequence valve Determines min. percussion pressure when drilling at full pow-er

19 Non–return valve Prevents oil flow from feed pressure to percussion LS line

20 Feed pressure regulating valve Determines feed pressure for collaring and in full power dril-ling, affects not only feed pressure but also percussion pres-sure (feed/percussion monitoring)

21 Feed pressure gauge Indicates feed pressure

22 Feed line pressure compensator Keep feed pressure constant, irrespective of input pressurevariations

23 Feed directional valve Directs oil flow to feed according to pilot valves (31) and (33)

24 Feed line B max. pressure reliefvalve

25 Feed line A max. pressure reliefvalve

26 Shuttle valve Directs oil flow in LS line of feed directional valve

28 Feed cylinder29 Feed LS line selector valve Selects normal feed pressure or fast feed pressure according

to pilot valves (31) and (33)30 Fast feed max. pressure relief

valveDetermines max. pressure for fast feed movement



18

125123

124 126

127121 120

TP

F1F2

MF MR R1

118

S8

0

S8

1

50

16

15

2 3 9 7

10

428

6

5

4

2622

23

25

24

11

21

132114

1151

116

117

13

28

32

20

33102

103

101

100

31

14

62

58

61

60

59

112

FROM CARRIERCIRCUIT

39

38

37

363534

2930

19

43

137136

138

12




S126

SLX

IN

OUT

IN

OUT

OUT

IN

BIN

OUT

44

A2/B2 K2/K4 A1/B1 T1/T3T4

119

122

111

110

133

113R1


5451

57

5352

56

55

135

129 130



31 Feed pilot control valve Determines feed speed and direction, and sets percussion to fullpower for drilling

32 Selector valve for feed LS linereturn circuit

Selects correct return line automatically for forward/reverse feed

33 Fast feed pilot control valve Determines fast feed speed and direction

34 Anti–jamming valve Controls feed direction in an anti–jamming situation

35 Shuttle valve Directs pressure information of feed pilot valve (31) to percus-sion pressure selector valve (5) and to feed LS line selectorvalve (29)

36 Shuttle valve Directs pressure information of feed pilot valve (31) to percus-sion pressure selector valve (5) and to feed LS line selectorvalve (29)

37 Shuttle valve Directs pressure information of feed pilot valve (31) or fast feedcontrol valve (33) to feed directional valve (23) (reverse feed)

38 Shuttle valve Directs pressure information of feed pilot valve (31), fast feedpilot valve (33), or return automatic to feed directional valve (23)

39 Return automatics selectorvalve

Controls feed directional valve (23) according to the value set bypilot pressure regulating valve (43)

42 Shuttle valve Directs LS signal of feed or boom circuit to variable displ. pump

43 Pilot pressure regulating valve Sets pilot circuit pressure

44 Directional valve Directs oil flow into the tank or into the feed circuit

50 Gear pump Output of oil flow to rotation circuit

51 Rotation pressure gauge Indicates rotation pressure

52 Pressure compensator Keeps rotation speend constant, irrespective of load

53 Rotation directional valve Controls oil flow to rotation motor (54)

54 Rotation mechanism

55 Rotation max. pressure reliefvalve

Determines max. pressure in rotation line

56 Flow control valve

57 Non–return valve Prevents oil flow back to pump (50)

58 Rotation pilot control valve Determines direction of rotation

59 Rotation speed regulating valve Sets rotation speed to desired value

60 Shuttle valve Directs pilot control pressure info to rot. speed regul. valve (59)

61 Orifice Restricts oil flow to directional valve of rotation (53) and to rota-62 Orifice

Restricts oil flow to directional valve of rotation (53) and to rota-tion speed regulating valve (59)

100 Water control valve Controls water flow to rock drill

101 Air control valve Controls air flow to rock drill

102 Selector valve for separateflushing

Opens/closes water or air control valve

103 Shuttle valve Activates either automatic or separate water flushing

110 Hydraulic oil tank

111 Hydraulic oil temperature gauge

112 Pressure filter Filters oil coming from variable displacement pump (1)



18

125123

124 126

127121 120

TP

F1F2

MF MR R1

118

S8

0

S8

1

50

16

15

2 3 9 7

10

428

6

5

4

2622

23

25

24

11

21

132114

1151

116

117

13

28

32

20

33102

103

101

100

31

14

62

58

61

60

59

112

FROM CARRIERCIRCUIT

39

38

37

363534

2930

19

43

137136

138

12




S126

SLX

IN

OUT

IN

OUT

OUT

IN

BIN

OUT

44

A2/B2 K2/K4 A1/B1 T1/T3T4

119

122

111

110

133

113R1


5451

57

5352

56

55

135

129 130



113 Return oil filter Filters return oil coming from drilling and carrier hydraulics

114 Cooler Oil cooler for drilling and carrier hydraulics return flows

115 Collecting piece For drilling and carrier hydraulics return flows

116 Non–return valve Prevents oil flow back to variable displacement pump

117 Non–return valve Prevents oil flow from drilling control circuit to carrier circuit

118 Pressure relief valve Determines pressure level for rear limit impulse cylinder

119 Pressure relief valve Determines pressure level for front limit impulse cylinder

120 Orifice Stabilizes rear limit impulse cylinder pressure

121 Orifice Stabilizes front limit impulse cylinder pressure

122 Air filter / hydraulic tank

123 Pressure switch Monitors pressure of the front limit impulse cylinder

124 Non–return valve Prevents return flow from front limit impulse cylinder

125 Pressure switch Monitors pressure of the rear limit impulse cylinder

126 Non–return valve Prevents return flow from rear limit impulse cylinder

127 Pressure regulator / relief valve Limits feed pressure for front and rear limit impulse circuit

129 Front impulse cylinder

130 Rear impulse cylinder

132 Ball valve For extra cooling

133 Pressure switch Monitors minimum pressure in pressure chamber

135 Collecting piece For non–pressure circuit hydraulic return flows

136 Pressure reducing and relievingvalve (option)

Sets desired stabilizer pressure

137 Control valve (option) Controls stabilizer pressure

138 Pressure switch Monitors stabilizer pressure



7. OPERATION OF SYSTEM

7.1. Oil temperature of drilling

After cold start, hydraulic oil should be warmed up to drilling temperature before drillingis started. This can be accomplished, for instance, by using an electric oil heater in thetank.

The recommended oil temperature of the drilling is between 40– 60 degrees (dependingon the type of the oil).

7.2. Reading diagrams

The following colors has been used in hydraulic diagrams for explaining different drillingoperations.

Blue – percussion Dash blue – percussion return line

Short dash blue – percussion LS–line

Red – feed Dash red – feed return line

Short dash red – feed LS–line

Green – rotation Dash green – rotation return line

Short dash green – rotation LS–line

Yellow – pilot control Dash yellow – pilot return line

Short dash yellow – pilot line

Brown – return automatics Dash brown – return automatics return line

Violet – stabilizer Dash violet – stabilizer return line

7.2.1. Valves

The number of the coil is colored red when the coil is activated.

+,��



117

125123

124 126

127

129 130

121 120

TP

F1

F2

MFMR R1

S8

0

S8

1

16

15

2 3 9 7

10

426

5

4

2622

23

25

24

11

21

132114

115

13

28

33102

103

101

31

14

61

60

59


39

38

37

363534

2930

19

43

137136

138

12

THE PRESSURESWITCH OF THEPERCUSSION HOURMETER



S126

100

50

1

116

188

OUT

OUT

OUT

OUT

IN

IN

IN

B

IN

32

20

44

A2/B2 K2/K4 A1/B1 T1/T3 T4

122

111

110

133

113R1


5451

57

5352

56

55

62

58

118119

135



7.3. Free circulation

Free circulation means a situation where the powerpack is running, but no hydraulicactuators are used.

7.3.1. Rotation circuit

The rotation pump (50) sucks the oil from the tank (110) and gives the flow out into therotation circuit. The oil flow produced by the rotation pump (50) flows through the freecirculation valve (52) of the rotation directional valve (53), the oil collector (115), the cooler(114) and the return oil filter (113) into the tank (110).

7.3.2. Percussion and feed circuits

The variable displacement pump (1) takes oil in through the intake connection of the tank(110) and pumps it into the percussion and feed circuits. As there is no consumption ofoil in these circuits during free circulation, it means that there is no pressure in the loadsensing line, either. The swash plate of the pump (1) is at 0 angle and the pump (1) ismerely maintaining a certain pressure (stand–by pressure) in the pressure line. Thestand–by pressure is regulated by the flow controller of the pump (1).

The pressure regulator / relief valve (43) regulates the pilot line pressure.



50

125123

124 126

127

129 130

121 120

TP

F1F2

MFMR R1

S80

S81

111

16

15

2 3 9 7

10

426

5

4

2622

23

25

24

11

21

132114

13

28

33102

103

101

31

14

61

60

59


39

38

37

363534

2930

19

43

137136

138

12




S126

100

1

116

117

188

OUT

OUT

OUT

OUT

IN

IN

ININ

B

32

20

44

A2/B2 K2/K4 A1/B1 T1/T3T4

122

111

110

133

113R1


5451

57

5352

56

55

62

58

118119

115 135



7.4. Rotation, feed and percussion

7.4.1. Rotation

When the control lever of the rotation pilot control valve (58) is locked into a back position(rotation to counterclockwise), pilot pressure will be able to affect the port a of the rotationdirectional valve (53) and to the port P1 of the rotation speed regulating valve (59).

When the rotation pilot control valve (58) is locked into the back position, pilot pressureaffects the port a of the rotation directional valve (53) and the port P1 of the rotation speedregulating valve (59). The oil produced by the rotation pump now flows to the rotationdirectional valve (53), the 3–way compensator (52), the rotation pressure gauge (51), theanti–jamming valve (34) and the rock drill rotation motor (54). In this situation, the 3–waycompensator (52) is activated and it tries to keep the rotation speed of the rock drill at thevalue set with the regulating valve (59)

The return flow from the rotation motor (54) passes through the connections B and T ofrotation directional valve (53), the collecting piece (115), the cooler (114), and the returnoil filter (113), and ends up in the tank (110).

The leak oil from rotation pilot control valve (58) and rotation speed regulating valve (59)will be first directed to the collecting piece (135) and from there to the hydraulic oil tank(110).

Oil flows also from the connection (X) of the rotation directional valve (53) to theconnection (P) of the control block of return automatics. From there oil flows through thepressure reducing and relieving valve (127) and the check valve (124) to the pressureswitch (123), to the pressure relief valve (119) and to the front impulse cylinder (129),through the check valve (126) to the pressure switch (125), to the pressure relief valve(118) and to the rear impulse cylinder (130). Oil flows also through the orifices (121) and(120) to the oil collector (135). From there oil flows to the hydraulic oil tank (110).



501

116

117

125123

124 126

127

129 130

121 120

TP

F1F2

MF MR R1

S8

0

S8

1

16

15

2 39 7

10

426

5

4

2622

23

25

24

11

21

132114

13

28

33102

103

101

31

14

61

60

59


39

38

37

363534

2930

19

43

137136

138

12




S126

100

188

OUT

OUT

OUT

OUT

IN

IN

ININ

B

32

20

44

A2/B2 K2/K4A1/B1T1/T3 T4

122

111

110

133

113R1


62

58

118119

115 135

5451

57

5352

56

55



7.4.2. Feed

When the control lever of the feed pilot control valve (31) is locked into a back position,(feed forward) pilot control pressure will be able to affect to control line d of the feeddirectional valve (23) through the anti–jamming valve (34) and the shuttle valve (36). Inaddition, the pilot pressure affects to the feed LS line selector valve (29) through theshuttle valve (35), and to the percussion pressure selector valve (5) through the shuttlevalve (16). The pilot pressure affects also to the directional valve (44) via shuttle valve(35).

The oil produced by the variable displacement pump (1) flows through the non–returnvalve (116) and the pressure filter (112) to the port P1 of control block of drilling. From herethe oil continues to flow through the feed line pressure compesator (22) to the controlspool of feed directional valve (23) and from there to the feed line A max. pressure reliefvalve (25) and through the connector A to the feed cylinder (28). From feed directionalvalve (23) oil flows also to the spring housing of the feed line pressure compensator (22)and through the shuttle valve (26) and the feed LS line selector valve (29) to the feedpressure regulating valve (20). After the shuttle valve (26) the oil is able also to flow to thefeed pressure gauge (21) and through the shuttle valves (42) and (10) to the flow controlvalve of variable displacement pump (1).

From connector P1 of control block of drilling the oil is able to flow to the pilot pressureregulating valve (43) and from there to the rotation pilot control valve (58), the percussionpilot control valve (14), the feed pilot control valve (31), the selector valve for separateflushing (102), the fast feed pilot control valve (33) and the return automatics selectorvalve (39) and the shank lubrication unit.

Oil from the feed cylinder (28) flows to the connection B of feed directional valve (23) andfrom there still to feed line B max. pressure relief valve (24). From here oil flows throughthe tank connector T3 of control block of drilling to the collecting piece (115), via the oilcooler (114) to the return oil filter (113) and the oil tank (110)

The leak oil from the feed pilot control valve (31) is first directed to the collecting piece(135) and from there to the hydraulic oil tank (110).



117

100

125123

124 126

127

129 130

121 120

TP

F1F2

MF MR R1

S8

0

S8

1

16

15

2 3 9 7

10

426

5

4

2622

23

25

24

11

21

132114

13

28

33102

103

101

31

14

61

60

59


39

38

37

363534

2930

19

43

137136

138

12


TO THE BOOM CONTROL(PI)


S126

501

116

188

OUT

OUT

OUT

OUT

IN

IN

IN

IN

32

20

44

A2/B2 K2/K4 A1/B1 T1/T3 T4

122

111

110

133

113R1


62

58

118119

115 135

5451

57

5352

56

55



7.4.3. Percussion

When the percussion pilot control valve (14) is locked into the back position, pilot controlpressure affects the water control valve (100) through the shuttle valve (103), and turnswater flushing on.

Pilot control pressure also activates the pressure switch (12) of the operating hour meter,and affects the percussion selector valve (4) through the shuttle valve (15). Thepercussion selector valve (4) opens the percussion main valve (3), and the output of thevariable displacement pump flows through the non–return valve (116), the pressure filter(112), the compensator (2), and the percussion main valve (3) to the percussionmechanism (13). In addition, the percussion circuit pressure reaches the pressure reliefvalve (6) for half–power percussion, passing through the orifice (9) and the percussionselector valve (5). After the orifice (9), the pressure also affects the pressure compensator(2), and reaches the load–sensing line of the variable displacement pump (1) through thethe shuttle valve (10).

The pressure after the percussion main valve (3) also affects the percussion pressuregauge (11).

The return flow from the rock drill (13) passes via the collecting piece (115), the cooler(114), and the return oil filter (113) to the hydraulic oil tank (110). Leak oil from thepercussion pilot control valve (14) is directed first to the collecting piece (135) and fromthere to the hydraulic oil tank (110).

When using rock drill with stabilizer oil flows also from the connection (P1) of the drillingcontrol block to the pressure reducing and relieving valve (136) and to the control valve(137) of the stabilizer. The control valve (137) of the stabilizer is activated when usingloosening the thread function (the control lever of percussion in front position). In thissituation there is no control pressure in the stabilizer and the oil flows from the stabilizervia the oil collector (115), the oil cooler (114), and the return filter (113) into the hydraulicoil tank (110).



117

125123

124 126

127

129 130

121 120

TP

F1F2

MF MRR1

S8

0

S8

1

16

15

2 3 9 7

10

426

5

4

2622

23

25

24

11

21

132114

13

28

33102

103

101

31

14

61

60

59


39

38

37

363534

2930

19

43

137136

138

12




S126

100

501

116

188

OUT

OUT

OUT

OUT

IN

IN

IN

IN

B

32

20

44

A2/B2 K2/K4 A1/B1T1/T3T4

122

111

110

133

113R1


62

58

118119

115 135

5451

57

5352

56

55



7.5. Drilling

7.5.1. Collaring

Collaring is composition of rotation, feed and percussion. All these functions are describedin the chapter “Rotation, feed and percussion”.

With the THC 560 system, collaring can be done accurately and smoothly by using thestepless feed and rotation speed, and feed pressure adjustments. In collaring, feed andpercussion are connected in parallel.

The control lever of feed pilot control valve (31) is used for selecting collaring andfull–power drilling. The lever offers two operating ranges: half–power and full–powerdrilling. On the lever movement, these two ranges are separated from one another by anoticeable step. Full–power drilling starts when this step is passed.

Drilling is started by locking the levers of the pilot control valves for rotation (58) andpercussion (14) into the back position. When the lever for the feed pilot control valve (31)is pulled backwards, the rock drill moves at the desired speed until the drill bit hassufficiently penetrated the rock. Full–power drilling is started by locking the control leverof the feed pilot control valve (31) into the back position.

Another method for collaring is to turn the feed pressure regulating valve (20) fully open(counterclockwise) and then lock all three control levers (rotation, percussion and feed)into the back position. Drilling starts now with half power, and continues so until the drillingvalues are returned to correspond to full–power drilling by turning the feed pressureregulating valve (20). In this collaring method, percussion and feed are also all timeconnected in series.

When using rock drill with stabilizer oil flows also from the connection (P1) of the drillingcontrol block to the pressure reducing and relieving valve (136) and to the control valve(137) of the stabilizer. The control valve (137) of the stabilizer is not activated duringcollaring, drilling, anti–jamming automatics, return automatics or threading. In thesesituation the oil flows through the control valve (137) to the pressure switch (138) and tothe stabilizer of the rock drill.



125123

124 126

127

129 130

121 120

TP

F1

F2

MF MR R1

S8

0

S8

1

16

15

2 3 9 7

10

426

5

4

2622

23

25

24

11

21

132114

13

28

33102

103

101

31

14

61

60

59


39

38

37

363534

2930

19

43

137136

138

12



FROM THEBOOMCONTROLVALVE

S126

100

117

50

1

116

188

OUT

OUT

OUT

OUT

IN

IN

IN

B

IN

32

20

44

A2/B2 K2/K4 A1/B1 T1/T3 T4

122

111

110

133

113R1


62

58

118119

115 135

5451

57

5352

56

55



7.5.2. Drilling

After successful collaring, full–power drilling is started by locking the control lever of thefeed pilot control valve (31) into the back position. The percussion pressure selector valve(5) changes its position and opens a connection through the sequence valve (18),feed/percussion monitoring valve (8), and non–return valve (19) to the feed LS circuit.Now, percussion and feed are connected in series, and percussion pressure depends onfeed pressure. The pressure difference between feed and percussion is determined bythe feed/percussion monitoring valve (8) and the sequence valve (18). The min. pressureof percussion is determined by the sequence valve (18). The max. pressure of percussionis determined by the percussion max. pressure relief valve (7).

When using rock drill with stabilizer oil flows also from the connection (P1) of the drillingcontrol block to the pressure reducing and relieving valve (136) and to the control valve(137) of the stabilizer. The control valve (137) of the stabilizer is not activated duringcollaring, drilling, anti–jamming automatics, return automatics or threading. In thissituation the oil flows through the control valve (137) to the pressure switch (138) and tothe stabilizer of the rock drill.

percussion

��

Collaring Full power drilling

�

�

max�

min�

Adjusting rangeof feed–percus-sion monitoring

Pressure differencebetween feed andpercussion



117

50

1

116

125123

124 126

127

129 130

121 120

TP

F1F2

MF MR R1

S8

0

S8

1

16

15

2 3 9 7

10

426

5

4

2622

23

25

24

11

21

132114

13

28

33102

103

101

31

14

61

60

59


39

38

37

363534

2930

19

43

137136

138

12




S126

100

188

OUT

OUT

OUT

OUT

IN

IN

IN

IN

B

32

20

44

A2/B2 K2/K4A1/B1T1/T3 T4

122

111

110

133

113R1


62

58

118119

115 135

5451

57

5352

56

55



7.6. Anti–jamming automaticsThe anti–jamming system operates in a situation where the rotation pressure of the drillrod rises above a set value due to, for instance, a fissure in the rock. In this situation, theoperation of the hydraulic system differs from normal as follows:When rotation pressure rises above the value set with the anti–jamming valve (34), thevalve (34) changes its position. The pilot control pressure now reaches the port c of thefeed directional valve (23) through the shuttle valves (37) and (38). This means that thefeed directional valve (23) also changes its position, and feed pressure enters the feedline B, and feed starts pulling backwards. Feed pressure also reaches the load–sensingline of the variable displacement pump (1) through the LS channel of the feed directionalvalve (23) and the shuttle valves (26), (42), and (10). After the non–return valve (26), thepressure in the feed LS line also reaches the pressure gauge (21). As feed backwards ison, the reversing pressure affects the tank line T1 of the feed pressure regulating valve(20). In this situation, the feed pressure regulating valve (20) does not determine the max.reversing pressure but it is determined by the max. pressure regulating valve (24) of thefeed line B of the feed directional valve (23).During the reversing phase, the rock drill (13) operates with full–power percussion. Thepercussion pressure is restricted by the percussion max. pressure relief valve (7).Feed reversing stays on until rotation pressure drops below the value set with theanti–jamming valve (34). After this, the anti–jamming valve (34) changes its position andthe control pressure from the pilot control valve (31) reaches the control line d of the feeddirectional valve (23) through the shuttle valve (36). The feed directional valve (23)changes its position and feed pressure reaches the feed line A, whereby feed startsforwards. Feed and percussion pressures are lower than normal, which is caused by thelower feed resistance and the feed/percussion monitoring. Sequence valve (18) doesn’tallow the percussion pressure go under the setting value. The feed and percussionpressures return to their normal set values as the feed resistance rises normal.The return flow from the rock drill rotation motor (54) passes through the rotationdirectional valve (53), the collecting piece (115), the cooler (114), and the return oil filter(113), and ends up into the hydraulic oil tank (110).The return flow from the percussion mechanism (13) passes through the collecting piece(115), the cooler (114), and the return oil filter (113), ending up into the hydraulic oil tank(110).The return flow from the feed cylinder (28) passes through the feed directional valve (23),the collecting piece (115), the cooler (114), and the return oil filter (113), and ends up intothe hydraulic oil tank (110).The return flow from the control block of return automatics passes through the collectingpiece (135) and ends up into the hydraulic oil tank (110).The leak oil of the pilot control valves (14), (31) and (58) is directed first to the collectingpiece (135) and from there to the hydraulic oil tank (110).When using rock drill with stabilizer oil flows also from the connection (P1) of the drillingcontrol block to the pressure reducing and relieving valve (136) and to the control valve(137) of the stabilizer. The control valve (137) of the stabilizer is not activated duringcollaring, drilling, anti–jamming automatics, return automatics or threading. In thissituation the oil flows through the control valve (137) to the pressure switch (138) and tothe stabilizer of the rock drill.



125123

124 126

127

129 130

121 120

TP

F1

F2

MF MR R1

S8

0

S8

1

16

15

2 3 9 7

10

426

5

4

2622

23

25

24

11

21

132114

13

28

33102

103

101

31

14

61

60

59


39

38

37

363534

2930

19

43

137136

138

12




S126

100

117

501

116

188

OUT

OUT

OUT

OUT

IN

IN

IN

IN

B

32

20

44

A2/B2 K2/K4A1/B1T1/T3 T4

122

111

110

133

113R1


62

58

118119

115 135

5451

57

5352

56

55



7.7. Flushing flow control (option)

7.7.1. General

Flushing flow control is an optional function. When this function is required, the rig will besupplied with a water flow meter in the flushing circuit. Each boom has its own separateflushing flow meter.

7.7.2. Function

When the water flow in the flushing circuit drops below the set value of the flow meter (forexample, due to lack of water or blocked drilling bit), the return automatics selector valve(39) is activated which lets the pilot pressure affect the connection (C) of the feeddirectional valve (23) via the shuttle valve (38).

Now there is pilot pressure at both connection (c) and (d) of the feed directional valve (23).The pilot pressure at the connection (c) is higher than at the connection (d). The spool ofthe directional valve (23) changes its position so that the rock drill starts to reverse untilthe water flow is normal.



125123

124 126

127

129 130

121 120

TP

F1

F2

MF MR R1

S8

0

S8

1

16

15

2 3 9 7

10

426

5

4

2622

23

25

24

11

21

132114

13

28

33102

103

101

31

14

61

60

59


39

38

37

363534

2930

19

43

137136

138

12




S126

100

117

501

116

188

OUT

OUT

OUT

OUT

IN

IN

IN

IN

B

32

20

44

A2/B2 K2/K4A1/B1 T1/T3 T4

122

111

110

133

113R1


62

58

118119

115 135

5451

57

5352

56

55



7.8. Impulse cylinder controlled return automaticsWhen return automatics is on and the rock drill reaches the front limit, starts the returnmovement, with rotation turned on. As the rock drill reaches the rear limit, fast feed isswitched off and relay K70 is delaying by 0.2 sec and during this time the rotation of drillrod stops. If the return automatics is desired to use without rotation, the control diode V19in the JB 102–box must be removed.

JB 102–box

V19

V10

18

29

3104

105

106

117

127

127

1215

12

V20

V11

V17

V18

V19

17

1416

1216

13

1418

K76

FLUSH.OPT.

K73

TMS

OPTION

X102B

K74 X1

K71

K72

K70

K75

Return automatics can also be used as an auxiliary function. In this case, the selectorswitch S73 for return automatics must be turned to the right and then back, whereby therock drill starts return movement with rotation.

When the rock drill reaches the front impulse cylinder (129), the pressure switch (123/S80)is activated, whereby percussion and feed control valves (14) and (31) are centralized (therotation pilot control valve (58) remains on). After that the control pressure in the saidcontrol lines disappears, and the percussion selector valve (4) changes its position andcloses the percussion main valve (3).

Control pressure is also removed from the water control valve (100), and water flushingis shuts off. The pressure switch (123/S80) activates the coil Y47 of the return automaticsselector valve (39), whereby the pilot control pressure regulated by the pilot controlpressure regulating valve (43) is able to reach the control line c of the feed directional valve(23) through the return automatics selector valve (39) and the shuttle valve (38). In thissituation, the feed directional valve (23) immediately changes its position, and fast feedis switched on.

Feed pressure also reaches the load sensing line of the variable displacement pump (1)through the shuttle valve (26), (42), and (10), and after the shuttle valve (26), also the feedpressure gauge (21). Fast feed backwards is on until the rear impulse cylinder (130) isactivated the limit switch (125/S81) . At the same time, the rotation pilot control valve (58)is centralized, and rotation is turned off, also fast feed to backwards stops.

The return flow from the rock drill rotation motor (54) passes through the rotationdirectional valve (53), the collecting piece (115), the cooler (114), and the return oil filter(113), into the hydraulic oil tank (110).



The return flow from the feed cylinder (28) passes through the feed directional valve (23),the collecting piece (115), the cooler (114), and the return oil filter (113), into the hydraulicoil tank (110).

The return flow from the control block of return automatics passes trough the collectingpiece (135) and ends up into hydraulic oil tank (110).

The leak oil of the pilot control valves (14), (31) and (58) is directed first to the collectingpiece (135) and from there to the hydraulic oil tank (110).

7.8.1. The function of the return automatics

ON

OFFPERCUSSION

FEED

ROTATION

FRONT LIMIT

START OFDRILLING FRONT LIMIT REAR LIMIT

REAR LIMIT

FAST FEEDBACKWARDS

S70

S71

S72

S80

S81

Y47

ROCK DRILLMOVEMENT

ON

OFF

ON

OFF

ON

OFF

ON

OFF

ON

OFF

FORWARDS

BACKWARDS

START OFDRILLING

FAST FEEDBACKWARDS

DRILLING



When using rock drill with stabilizer oil flows from the connection (P1) of the drillingcontrol block to the pressure reducing and relieving valve (136) and to the control valve(137) of the stabilizer. The control valve (137) of the stabilizer is not activated duringcollaring, drilling, anti– jamming automatics, return automatics or threading. In thesesituations the oil flows through the control valve (137) to the pressure switch (138) andto the stabilizer of the rock drill.



117

125123

124 126

127

129 130

121 120

TP

F1

F2

MF MR R1

S8

0

S8

1

16

15

2 3 9 7

10

426

5

4

2622

23

25

24

11

21

132114

13

2833102

103

101

31

14

61

60

59


39

38

37

363534

2930

19

43

137136

138

12




S126

100

50

1

116

188

OUT

OUT

OUT

OUT

IN

IN

IN

IN

B

32

20

44

A2/B2 K2/K4A1/B1 T1/T3 T4

122

111

110

133

113R1


62

58

118119

115 135

5451

57

5352

56

55



7.9. Manual control of fast feed

The manual control of fast feed is a proportional function, i.e. the inclination angle of thecontrol lever for the fast feed pilot control valve (33) determines the speed of fast feed (thebigger the angle the faster the speed). The control lever of the fast feed pilot control valve(33) centralized by a spring. Manual control of fast feed can, for instance, be used forflushing drilled holes.

During fast feed (forwards) the system operates as follows:

Rotation and percussion are not on in this situation, as the rotation pilot control valve (58)and the percussion pilot control valve (14) are in the central position. Free circulation ofrotation is explained in chapter ”Free circulation”.

When the control lever of the fast feed pilot control valve (33) is pulled to the back position,pilot control pressure passes through the shuttle valve (36) to the control line d of the feeddirectional valve (23). Now, the spool of the feed directional valve (23) changes itsposition, and the pressure from the percussion circuit passes through the compensator(22) and the feed directional valve (23) to the feed line A, and to the feed cylinder (28).Feed pressure also passes through the shuttle valves (26), (42), and (10) to the loadsensing line of the variable displacement pump (1), and after the shuttle valve (26) to thefeed pressure gauge (21). The max. feed pressure of fast feed forwards is restricted bythe max. pressure relief valve (25) for the feed line A of the feed directional valve, and bythe fast feed max. pressure relief valve (30) for fast feed backwards.

The return flow from the feed cylinder (28) passes through the feed directional valve (23),the collecting piece (115), the cooler (114), and the return oil filter (113), and ends up intothe hydraulic oil tank (110).

The leak oil of the pilot control valve (33) is directed first to the collecting piece (135) andfrom there to the hydraulic oil tank (110).

When using rock drill with stabilizer oil flows also from the connection (P1) of the drillingcontrol block to the pressure reducing and relieving valve (136) and to the control valve(137) of the stabilizer. The control valve (137) of the stabilizer is not activated duringcollaring, drilling, anti–jamming automatics, return automatics or threading. In thesesituation the oil flows through the control valve (137) to the pressure switch (138) and tothe stabilizer of the rock drill.



125123

124 126

127

129 130

121 120

TP

F1

F2

MF MR R1

S8

0

S8

1

16

15

2 3 9 7

10

426

5

4

2622

23

25

24

11

21

132114

13

28

33102

103

101

31

14

61

60

59


39

38

37

363534

2930

19

43

137136

138

12




S126

100

117

50

1

116

188

OUT

OUT

OUT

OUT

IN

ININ

B IN

32

20

44

A2/B2 K2/K4A1/B1 T1/T3T4

R1

122

111

110

133

113


62

58

118119

115 135

5451

57

5352

56

55



8. SPECIAL FUNCTIONS

8.1. Threading

Threading means a situation where the drill rod is threaded on or off with a rock drill shank.Threading is done with the control levers for the rotation pilot control valve (58) and thefeed pilot control valve (31).

In threading, the system operates as follows:

Rotation is turned on by pulling back the control lever of the rotation pilot control valve (58)(if required, the speed of rotation can be adjusted with the regulating valve (59) for rotationspeed). Pull the control lever of the feed pilot control valve (31) backwards to feed the rockdrill forwards at a speed that corresponds to the thread pitch. Keep the feed speedconstant throughout the threading operation. Feed pressure can be adjusted suitable withthe feed pressure regulating valve (20) (normal feed pressure for drilling can be used asthe basic setting).

The hydraulic functions of rotation and feed are explained in chapter “Rotation, feed andpercussion”.

When using rock drill with stabilizer oil flows from the connection (P1) of the drillingcontrol block to the pressure reducing and relieving valve (136) and to the control valve(137) of the stabilizer. The control valve (137) of the stabilizer is not activated duringcollaring, drilling, anti–jamming automatics, return automatics or threading. In thissituation the oil flows through the control valve (137) to the pressure switch (138) and tothe stabilizer of the rock drill.

During threading, rotation pressure must be kept below theanti–jamming activation pressure. If the pressure rises to this value, feeddirection is reversed.

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125123

124 126

127

129 130

121 120

TP

F1

F2

MF MR R1

S8

0

S8

1

16

15

2 3 9 7

10

426

5

4

2622

23

25

24

11

21

132114

13

28

33102

103

101

31

14

61

60

59


39

38

37

363534

2930

19

43

137136

138

12




S126

100

117

501

116

188

OUT

OUT

OUT

OUT

IN

IN IN

INB

32

20

44

A2/B2 K2/K4 A1/B1 T1/T3 T4

R1

122

111

110

133

113


62

58

118119

115 135

5451

57

5352

56

55



8.2. Loosen the bit

When the percussion pilot control valve (14) is locked into the front position, pilot controlpressure affects into the percussion selector valve (4) through the shuttle valve (15) andalso into the percussion pressure selector valve (5) through the shuttle valve (16). Thepercussion pressure selector valve (5) changes position and opens the serie connectionbetween feed and percussion. The percussion selector valve (4) opens the percussionmain valve (3), and the output of the variable displacement pump (1) flows through thenon–return valve (116), the pressure filter (112), the compensator (2), and the percussionmain valve (3) into the percussion mechanism (13). After the orifice (9), the pressureaffects into the pressure compensator (2), and reaches the load–sensing line of thevariable displacement pump (1) through the the shuttle valve (10). The oil flows also viasequense valve (18), monitoring valve (8) and non–return valve (19) to the feed pressureregulating valve (20). The pressure level of the percussion depends on now theadjustment of the feed regulating valve (20).

The pressure after the percussion main valve also affects into the percussion pressuregauge (11).

The return flow from the percussion mechanism (13) passes through the collecting piece(115), the cooler (114), and the return oil filter (113), ending up into the hydraulic oil tank(110).

Return flow from the feed regulating valve (20) passes through the directional valve (44),the collecting piece (115), the cooler (114) and the return oil filter (113) ending up into thehydraulic oil tank (110).


When using rock drill with stabilizer oil flows also from the connection (P1) of the drillingcontrol block to the pressure reducing and relieving valve (136) and to the control valve(137) of the stabilizer. The control valve (137) of the stabilizer is activated when usingloosening the thread function (the control lever of percussion in front position). In thissituation there is no pressure in the stabilizer and the oil flows from the stabilizer via theoil collector (115), the oil cooler (114), and the return filter (113) into the hydraulic oil tank(110).



125123

124 126

127

129 130

121 120

TP

F1

F2

MF MR R1

S8

0

S8

1

16

15

2 3 9 7

10

426

5

4

2622

23

25

24

11

21

132114

13

28

33102

103

101

31

14

61

60

59


39

38

37

363534

2930

19

43

137136

138

12




S126

100

117

50

1

116

18 8

OUT

OUT

OUT

OUT

IN

IN

IN

B

IN

32

20

44

A2/B2 K2/K4A1/B1 T1/T3 T4

R1

122

111

110

133

113


62

58

118119

115 135

5451

57

5352

56

55



8.3. Separate flushing

The THC 560 drilling system is equipped with a selector valve (102) for separate flushing.This makes it possible to flush the drilled hole with air or water as a separate function afterthe actual drilling.

The selector valve (102) for separate flushing can be locked, so that flushing can be lefton for longer periods. When the separate flushing selector valve is locked into the rearposition, water flushing is turned on, while the front position is for air flushing.

When water flushing (selector valve 102) is selected, the separate flushing function is asfollows:

When the selector valve is locked to the rear position, the pressure from the pilot controlpressure regulating valve (43) passes through the separate flushing selector valve (102)and the shuttle valve (103) to the water control valve (100), and water flushing is turnedon.




16

15

2 3 9 7

10

426

5

4

2622

23

25

24

11

21

132114

13

28

33102

103

101

31

14

61

60

59

112 FROM CARRIERCIRCUIT

39

38

37

363534

2930

19

43

137136

138

12




S126

100

125123

124 126

127

129 130

121 120

TP

F1F2

MFMRR1

S8

0

S8

1

501

116

117

188

OUT

OUT

OUT

OUT

IN

ININ

INB

32

20

44

A2/B2 K2/K4 A1/B1 T1/T3 T4

R1

122

111

110

133

113

L SX


62

58

118119

115 135

5451

57

5352

56

55



8.4. Using diesel engine for running rock drill

The THC 560 drilling system also allows the use the feed of rock drill with diesel. Thisfunction is convenient in maintenance work, when the powerpacks cannot be used. Whenthe rock drill needs to be fed forwards or backwards with diesel power, the boom controloperating valve for zoom or feed transfer must be used in addition to the feed pilot controlvalve (31). The directions of these two movements must always be chosen so that nodanger is caused to the operator or the rig.

When diesel power is used for running the rock drill forwards, the system operates asfollows:

When the feed pilot control valve (31) is pulled to the back position and, simultaneously,the boom zoom cylinder, for instance, is run inwards, the pressure that comes from thepilot control pressure regulating valve (43) reaches the feed control line d through the feedpilot control valve (31), the anti–jamming valve (34), and the shuttle valve (36). In addition,pilot control pressure passes through the shuttle valve (35) to the feed LS line selectorvalve (29). The pilot pressure affects also to the directional valve (44) via the shuttle valve(35). The oil produced by the carrier’s gear pump passes through the non–return valve(117), the pressure filter (112), the pressure compensator (22), and the feed directionalvalve (23) and to the feed cylinder (28) and through the port P5 of the percussion and feedcontrol block directly to the boom control valve. The pressure in the LS line of the feeddirectional valve passes through the shuttle valve (26) and selector valve (29) of the feedLS line, to the feed pressure regulating valve (20) and further through the selector valve(32) of the feed LS line return circuit to the return line of the feed cylinder (28). Thepressure in the feed LS line also affects the feed pressure gauge (21). The pressure inthe feed A line affects the pressure relief valve / intake valve (25), and the feed B linepressure affects the pressure relief valve / intake valve (24).

The return flow from the feed cylinder and the pilot control valves passes along the sameroute as described in chapter “Feed”.

Never use percussion mechanism with diesel. Low pressure of dieselcontrolled hydraulic system can damage components of the pressureaccumulator.

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8.5. Optional controls

THC 560 control panel is very flexible and ergonomical. In addition to drilling and boomcontrols this system is possible to equip (separately or together) also with optionalcontrols as follows:

Pito control� Pito control lever (TB / B26 boom) � Pito control and rod magazine rotation control lever (B26NV boom)

Shank lubrication control� SLU/KVL oil level low indication light � SLU oil flow error / stabilator pressure low indication light

Flushing control� Flushing control on / off selector switch



9. ADJUSTMENTS OF HYDRAULIC COMPONENTS

9.1. Adjusting percussion main valve

M9

M7X7

M1

M2

M2

M8

M3

M6

A

B

34

The percussion main valve (3) controls the oil flow to the rock drill and it is controlled bythe percussion selector valve (4). The percussion main valve is adjusted as follows:

1. Loosen the locking nut of the percussion main valve (3) adjusting screw.2. Turn the adjusting screw of the percussion main valve (3) fully closed (clockwise).3. Tighten the locking nut of the percussion main valve (3) adjusting screw.



9.2. Adjustments of variable displacement pump (1)

Before starting the powerpack, make sure that the adjusting screw of theflow controller (controller A) of variable displacement pump (1) is turnedalmost fully open (counterclockwise)

Before starting adjustments, make sure that the percussion main valve(3) is fully closed.

Before starting any adjustments remember that the hydraulic oiltemperature must be between 40–50 °C.

1. Remove the caps from the flow controller (A) and the pressure controller (B) andundo the locking nuts of their adjusting spindles.

2. Open the adjusting screws of the pressure controller (B) and the flow controller (A)almost fully open (counterclockwise).

3. Connect the pressure gauge to the pressure measuring point (M1) of the drillingcontrol block.

4. Start the powerpack.

5. Turn the adjusting screw of the flow controller (A) fully closed (clockwise). Note!The pump is now operating at constant pressure.

6. Turn the adjusting screw of the pressure controller (B) clockwise until the pressuregauge shows 100 bar. Let the LS–line bleed into a separate container by looseningthe hose connection of the flow controller (A). Let the connection stay looseneduntil all air has escaped. Then tighten the hose connection of the flow controller(A).

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��

��



7. Turn the adjusting screw of the pressure controller (B) clockwise until the pressuregauge shows 225 bar. Read the pressure value from the pressure gaugeconnected to the measuring point M1. Never exceed value 225 bar, higherpressure may damage the pump or other hydraulic components!!

8. Lock the adjustment of the pressure controller (B) with the locking nut.9. Turn the adjusting screw of the flow controller (A) almost fully open

(counterclockwise).10. Allow the pressure stabilize in the pressure gauge connected to the measuring

point M1.11. Adjust the standby pressure to 22 bar from the flow controller (A) by turning the

adjusting screw clockwise.12. Lock the adjusting screw of the flow controller (A) with the locking nut.13. Stop the powerpack.14. Allow the pressure come down (to zero) in the pressure gauge connected to the

measuring point M1.15. Start the powerpack.16. Allow the pressure stabilize in the pressure gauge connected to the measuring

point M1.17. If the standby pressure is in the recommended range in the pressure gauge

connected to the measuring point M1, install the protective caps to the flowcontroller (A) and pressure controller (B).

18. If the standby pressure is not in the right range, please readjust the flow controllerA according to the adjusting instruction chapters 9– 18.

19. Stop the powerpack.20. Remove the pressure gauge from the measuring point M1.



9.3. Adjusting pilot control pressure

43

M8

M6

M9

M7 X7

M1

M2

M2

M3

The pilot control pressure is adjusted with the pilot control pressure regulating valve (43).The adjusting procedure is as follows:

1. Loosen the locking nut of the adjusting screw of the pilot control pressureregulating valve (43).

2. Turn the adjusting screw of the valve (43) almost fully open (counterclockwise).

3. Connect a pressure gauge to the pressure measuring point M8 of the percussionand feed control block.


5. Push the control lever of the feed pilot control valve (31) to the front position (feedbackwards).

6. Adjust the pilot control pressure to 30 bar by turning the adjusting screw of the pilotcontrol pressure regulating valve (43) clockwise. Read the pressure value in the gaugeconnected to the measuring point M8.

7. Release the control lever of the feed pilot control valve (31) to the middle position(feed backwards off).

8. Lock the adjusting screw of the pilot control pressure regulating valve (43).

9. By turning on feed backwards, check the adjusted pressure value in the pressuregauge connected to the measuring point M8. If the reading is not asrecommended, readjust the pilot control pressure.

10. Stop the powerpack.

11. Remove the pressure gauge from the measuring point M8.



9.4. Adjusting the max. pressure of rotation circuit

The maximum pressure for rotation is adjusted with the rotation max. pressure relief valve(55) located in the rotation directional valve (53) inlet block. The adjusting procedure isfollowing:

1. Start the powerpack.2. Run the rock drill against the rear stopper.3. Stop the powerpack.4. Loosen the locking nut of the pressure relief valve (55).

5. Turn the pressure relief valve (55) adjusting screw almost fully open(counterclockwise).

6. Prevent the drill rod from rotating (drilling rotation).7. Turn the rotation speed regulating valve (59) closed (clockwise).8. Start the powerpack.9. Lock the control lever of the rotation pilot control valve (58) in the back position.

10. Adjust the rotation max. pressure to 180 bar with the pressure relief valve (55).Read the pressure in the rotation pressure gauge (51).

11. Lock the adjusting screw of the max. rotation pressure relief valve (55).12. Release the control lever of the rotation pilot control valve (58) to the middle

position.13. Stop the powerpack.14. Remove the tool preventing the drill rod rotation.15. Start the powerpack.16. Turn drilling rotation on again by locking the control lever of the rotation pilot control

valve (58) in the back position.17. Adjust the drill steel rotation speed to the desired value by turning the rotation

speed regulating valve (59) counterclockwise.18. Release the control lever of the rotation pilot control valve (58) to the middle

position.19. Stop the powerpack.



9.5. Adjusting anti–jamming pressure

The activation pressure of the anti–jamming automatics can be adjustedaccording to rock type. The rangerecommended by the manufacturer is 110to 140 bar, and the factory setting is 120bar. The activation pressure is adjustedwith the anti–jamming valve (34), and it canbe done during drilling. However, theadjustment is recommended to be done asfollows:

1. Loosen the locking nut of the anti–jamming valve (34) adjusting screw.2. Turn the anti–jamming valve (34) adjusting screw first fully closed (clockwise), and

open it then 2 turns (counterclockwise).3. Start the powerpack.4. Run the rock drill against the rear stopper.5. Stop the powerpack.6. Loosen the locking nut of rotation max. pressure relief valve (55) adjusting screw.7. Turn the rotation max. pressure relief valve (55) adjusting screw almost fully open

(counterclockwise).8. Turn the rotation speed regulating valve (59) closed (clockwise).

34

M1

M3

M2

Y47



�� !�

9. Plug the pressure side hose of the feed cylinder (Cf. Fig. 2).10. Prevent the drill rod from rotating (drilling rotation).11. Install a pressure gauge to the measuring point M3 of the anti–jamming/return

automatics block.12. Start the powerpack.13. Lock the control levers of rotation and feed pilot control valves (58)

and (31) to the back position.14. Adjust the desired anti–jamming activation pressure with the rotation max.

pressure relief valve (55) by turning the adjusting screw clockwise (factory setting120 bar). Read the pressure value in the rotation pressure gauge (51).

15. Adjust the anti–jamming valve (34) so that it directs feed pilot control pressure atthe set pressure to the measuring point M3 of the anti–jamming/return automaticsblock. Read the feed pilot control pressure in the pressure gauge installed in themeasuring point M3.

16. When the anti–jamming valve (34) is correctly adjusted, lock the adjusting screwof the valve (34).

17. Adjust rotation pressure with the rotation max. pressure relief valve (55) to 180 barby turning the adjusting screw clockwise. Read the pressure in the rotationpressure gauge (51).

18. Lock the adjusting screw of the rotation max. pressure relief valve (55).19. Release the control levers of rotation and feed pilot control valves (58) and (31).20. Stop the powerpack21. Remove the tool preventing the drill steel from rotating.22. Remove the plugs from the feed cylinder pressure side feed line (Cf. point 9), and

reconnect the hose to the feed cylinder.23. Start the powerpack.24. Turn drilling rotation on again by locking the control lever of rotation pilot control

valve (58) in the back position.25. Adjust the drill rod rotation speed to the desired value by turning the rotation speed

regulating valve (59) counterclockwise.26. Release the control lever of the rotation pilot control valve (58).27. Stop the powerpack.28. Remove the pressure gauge from the measuring point M3 for the

anti–jamming/return automatics.



9.6. Adjusting percussion half–power

�

M9

M7X7

M1

M2

M2

M8

M3

M6

A

B

Percussion half–power can vary between 80–100 bar. Factory setting is 100 bar.Percussion half–power is adjusted with the percussion half–power pressure relief valve(6) as follows:

1. Loosen the locking nut of the adjusting screw of percussion half–power pressurerelief valve (6).

2. Turn the adjusting screw of the percussion half power pressure relief valve (6) firstfully closed (clockwise), and then open it by 7 1/4 turns (counterclockwise).

3. Start the powerpack.4. Turn percussion half–power on by locking the control lever of percussion pilot

control valve (14) to the back position.5. Adjust percussion half–power pressure to 100 bar with the percussion half power

pressure relief valve (6). Read the pressure value from the percussion pressuregauge (11).

6. Tighten the locking nut of the adjusting screw for the percussion half–powerpressure relief valve (6).

7. Release the control lever of the percussion pilot control valve (14).8. Stop the powerpack.



9.7. Adjusting percussion full–power

M9

M7X7

M1

M2

M2

M8

M3

M6

A

B

�

The pressure of percussion full–power is adjusted to the desired value with the percussionfull–power pressure relief valve (7). Percussion full–power pressure should be adjustedaccording to the hardness of the rock and the drill steels used. The max. pressure ofpercussion may vary between 150– 210 bar with respect to the above factors. The factorysetting is 210 bar.

Percussion full–power pressure is adjusted as follows:1. Loosen the locking nut of the adjusting screw of the percussion full–power

pressure relief valve (7).2. Turn the adjusting screw of the percussion full– power pressure relief valve (7) first

fully closed (clockwise) and then open the adjusting screw 5 turns(counterclockwise).

3. Turn the feed pressure regulating valve (20) fully closed (clockwise).4. Start the powerpack.5. Lock the control lever of the percussion pilot control valve (14) to the front position.6. Adjust the percussion full– power pressure to the desired level with the adjusting

screw of the percussion full–power pressure relief valve (7). Turn clockwise toincrease the pressure and counterclockwise to decrease it. Read the pressure valuefrom the percussion pressure gauge (11).

7. Tighten the locking nut of the adjusting screw of the percussion full– powerpressure relief valve (7).

8. Release the control lever of the percussion pilot control valve (14).9. Turn the feed pressure regulating valve (20) fully open (counterclockwise).




9.8. Adjusting feed pressure

9.9. Adjusting feed pressure

Feed pressure is adjusted with the feed pressure regulating valve (20). This valve is usedfor adjusting the max. feed pressure in the system for the time when feed is run throughthe feed pilot control valve (31). In addition to this, the feed lines A and B are equippedwith a fixed pressure relief/intake valve cartridges as follows:

Feed A line (25) B line (24)

Cylinder feed TF 500 160 bar 210 bar

Cylinder feed TTF 500 160 bar 210 bar

Cylinder feed TTF 550 230 bar 210 bar

24 25

The max. feed pressures for chain feed and cylinder feed equipment are following:

Feed Max feed pressure

Cylinder feed TF 500 120 bar

Cylinder feed TTF 500 160 bar

Cylinder feed TTF 550 230 bar

NOTE! The min. feed pressure for all feeds is about 20 bar.

NB: TF 500 feed values are also applicable for CC 2500 feed.



9.10. Adjusting feed–percussion monitoringThe pressure difference between feed and percussion is determined by thefeed/percussion monitoring valve (8) and the sequence valve (18). The basic value isdetermined by the sequence valve (18). This value determines also the min percussionpressure when drilling with full power.

Monitoring valve (8) deviates the percussion pressure according the feed pressure anddetermines the starting point of the serie connection.

Turning the adjusting screw of the monitoring valve (8) clockwise increases the pressuredifference between feed and percussion and turning the screw counterclockwisedecreases it.

The final adjustment for the valve (8) is determined according to the rock conditions whendrilling with full power.

8

18

M9

X7M7

M1

M2

M2

M8

A

B

M6

M3

Basic adjusting of the feed/percussion monitoring:1. Loosen the locking nuts of the sequence valve (18) and the feed/percussion

monitoring valve (8).2. Turn the adjusting screw of the sequence valve (18) and the feed/percussion

monitoring valve (8) fully open. Make sure that the screw does not come out.3. Start the powerpack and engage percussion and feed forward (drill moves

forward).4. Turn the adjusting screw of the sequence valve (18) until the percussion pressure

gauge indicates 100bar. Lock the adjusting screw of the valve (18) by tighteningthe locking nut.

5. Disengage return automatics and run the rock drill against the front stopper.Engage forward feed and turn the feed–pressure adjusting valve (20) until thefeed–pressure gauge indicates 120bar

6. Engage percussion and feed forward, and adjust the valve (8) until thepercussion–pressure gauge indicates 210bar. Lock the adjusting screw of thevalve (8) by tightening the locking nut.



Notice! Be careful when opening (screwing counterclockwise) the adjustingscrews of the valves (8) and (18). The adjusting screws will totally come out whichmeans that there is a risk of oil flush.

Notice! Check the settings of the feed–percussion monitoring by drilling withdifferent power settings. If the shank does not smoke with any drilling power, thesettings are correct.



9.11. Adjusting fast feed max. pressure

��

The max. pressure of fast feed is adjusted with the fast feed max. pressure relief valve(30). The adjustment is done as follows:

1. Loosen the locking nut of the fast feed max. pressure relief valve (30).2. Start the powerpack.3. Run the rock drill against the rear stopper by locking the control lever of fast feed

pilot control valve (33) into the front position and adjust at the same time the fastfeed max. pressure by the pressure relief valve (30). Read the pressure value fromthe pressure gauge (21). The value of fast feed pressure relief valve depends onthe feed in use as follows:Feed Value of the fast feed relief valve (30)TF 500 210 barTTF 500/550 180 bar

4. Release the control lever of the fast feed pilot control valve (33).5. Lock the adjusting screw of the fast feed max. pressure relief valve (30).6. Stop the powerpack.



9.12. Adjusting fast feed max. speed

FORWARDS

BACKWARDS

23

The max. fast feed speeds are adjusted with the adjusting screws at the feed directionalvalve (23) (Cf. Fig.). The lower screw is for adjusting fast feed max. speed forwards andthe upper for max. speed backwards.

Tamrock recommends the following fast feed speeds:

Direction of fast feed Tamrock recommendation

Forwards TF 500 ≈ 0.3 m/s

TTF 500/550 ≈ 0.3 m/s

Backwards TF 500 ≈ 0.5 m/s

TTF 500/550 ≈ 0.3 m/s

Fast feed speeds are adjusted as follows:1. Remove the drill rod from the rock drill to enable free running of rock drill from end

to end on the feed.2. Start the powerpack.3. Loosen the locking nuts of the adjusting screws for fast feed speeds at the feed

directional valve (23) (Cf. Fig.).4. Lock the control lever of the fast feed pilot control valve (33) to the back position

to run fast feed forwards. Adjust the movement speed to approx. 0.3 m/s with thelower adjusting screw at the feed directional valve.

5. Release the control lever of the fast feed pilot control valve (33).6. Lock the lower adjusting screw for fast feed speed at the feed directional valve

(23).7. Check the adjustment and readjust as necessary.8. Lock the control lever of the fast feed pilot control valve (33) to the front position

to run fast feed backwards. Adjust the movement speed to approx. 0.5 m/s (0,3m/s with TTF 500/550) with the upper adjusting screw at the feed directional valve.

9. Release the control lever of the fast feed pilot control valve (33).10. Lock the upper adjusting screw for fast feed speed at the feed directional valve

(23).11. Check the adjustment and readjust as necessary.12. Stop the powerpack.




9.13. Adjusting rotation speed

The drill rod rotation speed is adjusted with the rotation speed regulating valve (59). Turnthe adjusting knob counterclockwise to decrease the speed and clockwise to increase thespeed. The correct drill rod rotation speed depends on the hardness of the rock and onthe hole diameter. Tamrock recommends the following rotation speeds for different holediameters:

Drill bit size Rotation speed -�./0

Ø32 250

Ø38 250

Ø45 200

Ø51 200

Ø64 150

Ø76 150

Ø89 110

Ø102 110

Ø115 80

Ø127 80

Ø178 60



9.14. Bleeding of the impulse cylinder block

Pressure switches (S80 and S81) of the impulse cylinder block is bleeded as follows:1. Start the powerpack2. Remove the cover from the measuring plugs (MF and MR) of the impulse cylinder

block3. Install end of the overflow hoses to the measuring plugs (MF and MR) and the other

ends to overflow receptacle4. Bleeding is performed, when out coming oil is free of air bubbles5. Remove the overflow hoses from the measuring plugs (MF and MR)6. Stop powerpack

MR

MF

9.14.1. Adjusting the pressure switch

Adjusting the pressure switches (S80 and S81) of impulse cylinder block, must be donein special test bench. Activating pressure of the pressure switches is 18 bar.



9.14.2. Bleeding of the impulse cylinders

Bleeding of the impulse cylinders are bleeded as follows:1. Start the powerpack2. Locate the overflow receptacle under the impulse cylinder3. Rotate the bleeding screw of the impulse cylinder carefully open

(counterclockwise)4. When all of the air has came out, tighten the bleeder–screw (clockwise)5. Stop the powerpack.

Bleeding screw

9.15. Bleeding of the pressure switch (12)1. Locate the overflow receptacle under the pressure switch.2. Start the powerpack3. Loosen a joint between pressure switch and hose joint.4. When all of the air has came out, tighten the joint.5. Stop the powerpack.



9.16. Adjusting percussion hour meter pressure switch

Adjust the pressure switch of the percussion operating hour meter as follows:

1. Turn the adjusting screw of the pressure switch (12) for the percussion operatinghour meter almost closed (clockwise).


3. Lock the control lever of the percussion pilot control valve (14) to the back position.

4. Turn the adjusting screw of the pressure switch (12) for the percussion operatinghour meter counterclockwise until it makes contact. Then, turn the pressure switch(12) adjusting screw another 2 1/2 turns counterclockwise. Use a multimeter fordetermining switch operation.




9.17. Adjustment of stabilizer pressureReducing and relieving valve (136) and pressure switch (138)

136137

Connection of thepressure switch138 (M11)

The pressure of the stabilizer is controlled by the pressure reducing / relieving valve (136),the control valve (137) and the pressure switch (138).

1. Open the locking nut of the pressure reducing / relieving valve (136).2. Turn the adjusting screw of the pressure reducing / relieving valve (136) fully open

(anti–clockwise).3. Install the pressure gauge (60 bar) into the measuring point (M10).4. Start the powerpack.5. Loosen the hydraulic hose connection slightly from the pressure switch (138)

(capture the leaking oil into a suitable container).6. Allow the air escape through the hose connection of the pressure switch (138).7. When all air has come out, tighten the hose connection of the pressure switch

(138).8. Put the feed backwards on (feed the rock drill towards the rear stopper).9. Turn the adjusting screw of the pressure reducing / relieving valve (136) clockwise

until the pressure gauge indicates pressure 10 bar.10. Tighten the locking nut of the pressure reducing / relieving valve (136).11. Stop the powerpack.12. Remove the oil container and the measuring gauge from the measuring point

(M10).

NOTE! The adjustment (5 bar) of the pressure switch (138) requires the use of specialtest bench.



10. TROUBLESHOOTING

10.1. General

If the drilling system is not working as it should, check the following points before makingany further measurements:

� Signal lights, e.g.– hydraulic oil level– hydraulic oil temperature– pressure differences over return and pressure filters– water and air pressure control– powerpacks’ direction of rotation– etc.

� External leaks at hoses, connection, adapters, and other hydraulic components.� Mechanical functions (e.g. sliding pieces, rollers and return wheels)� Supply voltage to the drilling rig / the different devices.� External cable damage.� Mounting of electric plugs.� Pressure gauge readings.

10.2. Pumps (1) and (50) do not rotate at all, or their speed is notnormal

1. Measure the supply voltage to the powerpack. If the voltage is correct, it is likelythat the fault is mechanical. If the electric motor does not receive sufficient controlvoltage, refer to electric system troubleshooting.

2. Check if a mechanical damage prevents the pumps from rotating.3. Repair or replace the damaged component.

Noisy powerpack normally predicts a mechanical fault. It is best toimmediately repair (or replace) the component that causes the noise, inorder to avoid any greater damage.

)�*$�%�



10.3. Variable displacement pump (1) rotates normally, but thesettings of its regulator are not normal

The settings of the variable displacement pump (1) regulator are as follows:– Flow regulator (A) 22 bar– Pressure regulator (B) 225 bar

These settings of the variable displacement pump (1) can be easily checked as follows:1. Install a pressure gauge to the measuring point M1 for feed and percussion.2. Start the powerpack.3. Read the stand–by pressure value in the pressure gauge

at the measuring point M1 (allow the pressure to stabilize).4. Run, for instance, the zoom cylinder inwards and read

the pressure, at the same time, in the pressure gauge at the measuring point M1.

5. Stop the powerpack.6. Remove the pressure gauge from the measuring point M1.

10.3.1. Flow regulator (A) value deviates from the set value 22 bar1. Install a pressure gauge to the measuring point M7 for

feed and percussion.2. Start the powerpack.3. If the pressure at the measuring point M7 of the feed and percussion control block

is normal tank pressure, it is likely that the regulator A of the pump (1) is incorrectlyadjusted or sticking. Adjust the free circulation pressure of the pump (1) to thecorrect value with the regulator A (Cf. “Adjustments of variable displacement pump(1)”).

4. If the above measures did not help, stop the powerpack and repair or replace thewhole regulator unit. Adjust the regulator A or the regulator unit according tochapter “Adjustments of variable displacement pump (1)”.

5. If the pressure at the pressure measuring point M7 of the feed and percussioncontrol block is over the normal tank pressure, it may be that one of the valves (3),(4), (14), (23), (31), (33), (39), or of the boom valves, is sticking (i.e. one of theabove valves is leaking, and giving a control signal to the pump (1)).

6. Start troubleshooting by checking the condition of the pilot control valves (14), (31),and (33), and the return automatics selector valve (39).

They can be inspected as follows:– Start the powerpack.– Install a pressure gauge to the following measuring points alternately:

– measuring point M9 of the feed and percussion control block– measuring points M1, M2, and M3 of the anti–jamming and return

automatics control block

�



– If the measuring point M9 receives pressure, it is likely that the spool of thepercussion pilot control valve (14) is sticking.

– If the measuring point M2 or M3 of the anti–jamming and return automatics controlblock receives pressure, it is likely that the fast feed pilot control valve (33) or thereturn automatics selector valve (39) is sticking.

– If the measuring points M1 and M2 or M1 and M3 of the anti–jamming and returnautomatics control block receive pressure simultaneously, it is likely that the feedpilot control valve (31) is sticking.

– Stop the powerpack and replace the faulty valves.7. If the above measures did not help, check the operation of the valves (3), (4), (23),

and of the boom valve. They are inspected as follows:– Install a pressure gauge to the measuring point M1 of the feed and percussion

control block.– Start the powerpack.– If the readings of the percussion (11) and feed (21) pressure gauges are zero, but

the pressure at the measuring point M1 is over stand by–pressure, it is likely thatthe boom valve is sticking.

– Stop the powerpack.– Clean, repair, or replace the boom valve.– Remove the pressure gauge from the measuring point M1.– If pressure reaches the percussion pressure gauge (11) and percussion operates

normally when the powerpack is running, it is likely that the percussion main valve(3) or the percussion selector valve (4) is faulty. In this case, do as follows:

– Stop the powerpack.– Clean and repair, or replace the faulty valve.

– If pressure reaches the feed pressure gauge (21) when the powerpack is running,it is likely that the spool of the feed directional valve (23) is sticking. In this case,do as follows:

– Stop the powerpack.– Remove the spool of the feed directional valve (23).– Clean the spool and the spool housing carefully.– Reinstall the spool (do not use excessive force).



10.3.2. Pressure regulator (B) value deviates from the set value 225 bar1. Install a pressure gauge to the measuring point M1 of the feed and percussion

control block.2. Start the powerpack.3. Run, for instance, the zoom cylinder inwards and adjust, at the same time, the

pressure regulator (B) of the pump (1) to the set value 225 bar.4. If the pressure regulator does not react to adjustment, it is either sticking or faulty.5. Stop the powerpack.6. Clean and repair the regulator (B), or replace the whole regulator unit (adjust

according to chapter “Adjustments of variable displacement pump (1)”).7. If the pressure regulator (B) operates normally during drilling, but the max.

pressure value of 225 bar is not reached when the boom is run, it is likely that theboom valve’s main pressure limit is faulty. In this case, look up into “Hydraulic TBboom” manual.

10.4. Percussion not working at all1. If the percussion pressure gauge (11) shows a reading, but percussion does not

work when the control lever of the percussion pilot control valve (14) is locked intothe rear position, it is likely that the rock drill is faulty. In this case, do the following:

– Stop the powerpack.– Repair or replace the rock drill (refer to rock drill manuals).2. If the percussion pressure gauge (11) does not show any reading when the

percussion control lever (14) is locked into the rear position, it is likely that eitherthe percussion main valve (3) or the percussion selector valve (4) is sticking.Check the operation of the valves as follows:

– Stop the powerpack.– Clean and repair, or replace the faulty valve(s).3. If the percussion pressure gauge (11) shows a reading, but percussion starts only

partially (or not at all) when the control lever of the percussion pilot control valve(14) is locked into the rear position, and while boom functions are normal, it is likelythat the orifice (9) in the load–sensing line is blocked. Check the orifice as follows:

– Stop the powerpack.– Remove the orifice (9) and check if it is blocked (clear the hole as necessary).– Mount the orifice (9) carefully back.



10.5. Percussion is on always when the powerpack or the dieselengine is running

1. First, check tank line pressure of the drilling pilot control valves (58), (14), and (31).This pressure should be less than 1 bar. The tank pressure is checked as follows:

– Stop the powerpack.– Install a pressure gauge to the tank line of the drilling pilot control valves (58), (14),

and (31).– Start the powerpack.– If the pressure in the tank line is over 1 bar, check if the tank line is correctly installed

or is there something blocking the line.2. If the tank line pressure of the pilot control valves (58), (14), and (31) is below 1

bar, it is likely that either the valves (3) and (4) or the valve (14) is sticking. Theoperation of the valves can be checked as follows:

– Install a pressure gauge to the measuring point M9 of the feed and percussioncontrol block.

– Start the powerpack.– If the measuring point M9 shows no pressure, it is likely that the valve (3) or (4) is

sticking. Check the valves as follows:– Stop the powerpack.– Clean and repair, or replace the faulty valve(s).

– If the measuring point M9 shows a pressure reading, it is likely that the valve (14)is sticking (leaking). Check the operation of the valve as follows:

– Stop the powerpack.– Replace the percussion pilot control valve (14).

10.6. Percussion full–power max. pressure too high1. If the percussion pressure is too high, start troubleshooting by checking the

adjustment of the percussion max. pressure relief valve (7) according to chapter“Adjusting percussion full–power”. If the percussion pressure relief valve (7) is notworking properly, clean and repair, or replace the valve.

2. If the above measures do not make the pressure level correct, the fault may be thatthe load–sensing line orifice (9) has loosened. The mounting of the orifice (9) ischecked from the port 9 of the feed and percussion control block as follows:

– Stop the powerpack.– Remove the plug from the port 9 of the feed and percussion control block.– Check if the orifice (9) is properly seated at the bottom of the drilling port 9.– If the orifice has loosened, retighten it carefully.– Mount the plug back on the port 9 of the feed and percussion control block.



10.7. Percussion full–power max. pressure too low1. If the percussion pressure is too low, start out by checking the operation of the

percussion max. pressure relief valve (7) according to chapter “Adjustingpercussion full–power”. If the percussion pressure relief valve (7) does not adjustas described in the said chapter, clean and repair, or replace the valve.

2. Next, check the feed pilot control pressure value:– Remove the drill rod.– Install a pressure gauge to the measuring point M1 for the anti–jamming and return

automatics.– Start the powerpack.– Run the rock drill against the front stopper by locking the control lever of the feed

pilot control valve into the rear position.– If the pressure at the measuring point M1 is not 19–21 bar, it is likely that the feed

pilot control valve (31) is faulty.– Stop the powerpack.– Replace the feed pilot control valve (31).– If the pressure at the measuring point M1 is approx. 19–21bar, it is likely that the

percussion pressure selector valve (5) is faulty or sticking. Check the operation ofthe valve as follows:

– Stop the powerpack.– Clean and repair, or replace the faulty valve (5).

3. Percussion pressure may also drop if the load–sensing line orifice (9) becomesblocked. Check the orifice (9) as follows:

– Start the powerpack.– Turn percussion on by locking the control lever of the percussion pilot control valve

(14) into the rear position, and move the boom at the same time.– If the boom functions are normal, but the percussion pressure remains low, it is

likely that the orifice (9) in the load–sensing line is at least partly blocked. Checkthe orifice (9) hole as follows:

– Stop the powerpack.– Remove the orifice (9) to check it (clear the hole as necessary).– Mount the orifice (9) back carefully.

4. If the output of the pump (1) is insufficient, the percussion pressure will drop. Theoutput of the pump (1) can be checked by installing flow meters to the percussionand feed lines. The flow rates for percussion (HL560 / HLX5) and feed (TF500 /TTF500) are following:

Feed type Percussion Feed

Cylinder feed 100 – 115 l/min 4 – 8 l/min



If the flow rates are higher than those given above, you should immediately check thecondition of the rock drill or the feed cylinder.

5. A drop in percussion pressure may also be caused by a leaking shuttle valve (10).Check the shuttle valve as follows:

– Stop the powerpack.– Clean or replace the valve (10).

6. Check the condition of the pressure gauge (11) with a calibrated reference gauge.

10.8. Percussion half–power pressure too high1. If the percussion half–power pressure is too high, check the adjustment of the

percussion half–power pressure relief valve (6) according to chapter “Adjustingpercussion half–power”. If the pressure relief valve (6) does not work as it should,clean and repair, or replace the valve.

2. If the pressure level is not correct after the above repair, the reason may also bethat the orifice (9) of the load–sensing line has loosened. The mounting of theorifice (9) is checked from the port 9 of the feed and percussion control block asfollows:

– Stop the powerpack.– Remove the plug from the port 9 of feed and percussion control block.– Check if the orifice (9) is properly seated at the bottom of the drilling port

9.– If the orifice has loosened, retighten it carefully.– Mount the plug back on the port 9 of the feed and percussion control

block.3. High pressure level of percussion half–power may also result if the percussion

pressure selector valve (5) is sticking. Check the operation of the valve as follows:– Stop the powerpack.– Clean and repair, or replace the valve (5).



10.9. Percussion half–power pressure too low1. If the percussion half–power pressure is too low, check the adjustment of the

percussion half–power pressure relief valve (6) according to chapter “Adjustingpercussion half–power”. If the pressure relief valve (6) does not work as it should,clean and repair, or replace the valve.

2. If the pressure level is not correct after the above repair, the reason may also bethat the orifice (9) of the load–sensing line has become blocked. Check the orifice(9) from the port 9 of the feed and percussion control block as follows:

– Stop the powerpack.– Remove the plug from the port 9 of feed and percussion control block.– Remove the orifice (9) at the bottom of the drilling.– Clear the orifice hole as necessary.– Mount the orifice (9) back to the bottom of the hole carefully.– Mount the plug back on port 9 of the feed and percussion control block.

10.10. Feed not working at all (drilling)

If drilling feed is not working at all, check the adjustment of feed pilot control pressure.Feed pilot control pressure is checked as follows:

1. Install a pressure gauge to the measuring point M1 of the anti–jamming and returnautomatics block.

2. Start the powerpack.3. Lock the control lever of the feed pilot control valve (31) into the rear position.4. If the pressure at the measuring point M1 is approx. 19–21 bar, and the feed

pressure gauge (21) also shows a pressure reading, it is likely that the feedcylinder is faulty, or a mechanical fault prevents feed. Repair or replace the faultycomponent(s).

5. If the pressure at the measuring point M1 is approx. 19–21 bar, but the feedpressure gauge (21) does not show any reading, it is likely that the spool of the feeddirectional valve (23) is sticking. Check the operation of the spool as follows:

– Stop the powerpack.– Remove the front cover of the feed directional valve (23). The spool

comes out with the cover.– Clean the spool and the valve housing carefully.– Mount the spool back with care.

If there is no pressure at the measuring point M1, it is likely that the feed pilot control valve(31) is faulty. Repair as follows:

1. Stop the powerpack.2. Replace the valve (31).



10.11. Drilling feed pressure too low

Troubleshooting should be started by checking the operation of the feed regulating valve(20). This is done as follows:

1. Start the powerpack.2. Lock the control lever of the feed pilot control valve (31) into the front position.3. Check if the feed pressure regulating valve (20) adjusts the feed pressure

according to the chapter “Adjusting feed pressure”. Read the pressure value in thepressure gauge (21).

4. Release the control lever of the feed pilot control valve (21) into the middle position.5. Stop the powerpack.

If the feed pressure regulating valve (20) does not adjust according to the chapter“Adjusting feed pressure”, it is likely that either the valve (20) or the feed cylinder is faulty.Check the condition of the components as follows:

1. Stop the powerpack.2. Plug the feed pressure line.3. Start the powerpack and check if the feed pressure regulating valve (20) adjusts

according to the chapter “Adjusting feed pressure”.4. If the valve (20) adjusts according to the chapter “Adjusting feed pressure”, it is

likely that the feed cylinder is faulty. Repair or replace the faulty component.5. If the feed pressure regulating valve (20) is still not adjusting, it is likely that the

valve (20) is faulty. Clean and repair or replace the valve.

If the above repairs did not remedy the feed pressure adjustment, check the feed pilotcontrol pressure value. It should be approx. 19–21 bar. Check the pressure as follows:


2. Remove the drill rod.3. Lock the control lever of the feed pilot control valve (31) into the rear position.4. If the pressure at the measuring point M1 is not approx. 19–21 bar, it is likely that

the feed pilot control valve (31) is faulty. Repair as follows:– Stop the powerpack.– Replace the faulty pilot control valve (31).



10.12. Drilling feed pressure too high1. First, check the operation of the feed pressure regulating valve (20) as instructed

in chapter “Drilling feed pressure too low”, section 1. If the pressure regulatingvalve (20) does not adjust according to the chapter “Adjusting feed pressure”, itis likely that the valve (20) is faulty. Repair as follows:

– Stop the powerpack.– Clean and repair, or replace the valve (20).

2. If the fault was not removed, follow the instructions in the Chapter “Drilling feedpressure too low”, section 2. If the pressure at the measuring point of theanti–jamming and return automatics block is well over 21 bar, it is likely that thefeed pilot control valve (31) or the fast feed pilot control valve (33) is faulty. Checkthe operation of the valves as follows:

– Install pressure gauges to the measuring points M1 and M2 of theanti–jamming and return automatics block.

– Start the powerpack.– If pressure reaches the measuring point M2 only, it is likely that the fast

feed pilot control valve (33) is faulty, but if both measuring points receivepressure simultaneously, it is likely that the feed pilot control valve (31)is faulty.

– Stop the powerpack.– Replace the faulty valve.

3. If the fault still was not removed, it is likely that the compensator (22) of the feeddirectional valve (23) is faulty. In this case, the feed directional valve (23) must bereplaced as a complete unit.



10.11. Drilling feed pressure too low

Troubleshooting should be started by checking the operation of the feed regulating valve(20). This is done as follows:

1. Start the powerpack.2. Lock the control lever of the feed pilot control valve (31) into the front position.3. Check if the feed pressure regulating valve (20) adjusts the feed pressure

according to the chapter “Adjusting feed pressure”. Read the pressure value in thepressure gauge (21).

4. Release the control lever of the feed pilot control valve (21) into the middle position.5. Stop the powerpack.

If the feed pressure regulating valve (20) does not adjust according to the chapter“Adjusting feed pressure”, it is likely that either the valve (20) or the feed cylinder is faulty.Check the condition of the components as follows:

1. Stop the powerpack.2. Plug the feed pressure line.3. Start the powerpack and check if the feed pressure regulating valve (20) adjusts

according to the chapter “Adjusting feed pressure”.4. If the valve (20) adjusts according to the chapter “Adjusting feed pressure”, it is

likely that the feed cylinder is faulty. Repair or replace the faulty component.5. If the feed pressure regulating valve (20) is still not adjusting, it is likely that the

valve (20) is faulty. Clean and repair or replace the valve.

If the above repairs did not remedy the feed pressure adjustment, check the feed pilotcontrol pressure value. It should be approx. 19–21 bar. Check the pressure as follows:


2. Remove the drill rod.3. Lock the control lever of the feed pilot control valve (31) into the rear position.4. If the pressure at the measuring point M1 is not approx. 19–21 bar, it is likely that

the feed pilot control valve (31) is faulty. Repair as follows:– Stop the powerpack.– Replace the faulty pilot control valve (31).



10.14. Manually controlled fast feed too slow1. Start troubleshooting by checking the pilot control pressures of fast feed in both

directions. The pressures are checked as follows:– Install pressure gauges to the measuring points M2 and M3 of the

anti–jamming and return automatics block.– Remove the drill rod.– Start the powerpack.– Run fast feed back and forth by turning the control lever of the fast feed

pilot control valve (33) forwards and backwards.2. If both measuring points show an approx. 30 bar pilot control pressure, it is likely

that the fault is caused by either the adjustments of fast feed max. speeds or theadjustment of fast feed max. pressure. Check the adjustments as follows:

– Run the rock drill against the rear stopper by locking the control lever of the fastfeed pilot control valve (33) into the front position.

– If the feed pressure gauge (21) shows the set 210 bar pressure, it is likely that thefast feed max. speeds are incorrectly adjusted. Adjust the fast feed max. speedsaccording to instructions in chapter “Adjusting fast feed max. speed”.

– If the fast feed max. pressure is not at the set value, adjust the pressure accordingto chapter “Adjusting fast feed max. pressure”. If the adjustment does not correctthe situation, the fault is caused by either the fast feed max. pressure relief valve(30) or the feed cylinder.

– Stop the powerpack.– Plug the feed pressure gauge.– Start the powerpack.– Run fast feed forwards by pushing the control lever of the fast feed pilot

control valve (33) forwards.– If the fast feed pressure now adjusts to the set value, it is likely that the

feed cylinder is leaking or the feed has mechanical fault. Repair or replacethe faulty component(s).

– If the pressure does not adjust with the fast feed max. pressure reliefvalve (30), it is likely that the valve is faulty. Clean and repair, or replacethe valve (30), and adjust as instructed in chapter “Adjusting fast feedmax. pressure”.

10.15. Manually controlled fast feed too fast

If manually controlled fast feed is too fast in either direction, the fast fed max. speeds areincorrectly adjusted. Refer to chapter “Adjusting fast feed max. speed” for adjustments.



10.16. Rotation pressure too low1. If rotation pressure is insufficient during drilling, you should immediately check the

setting of the rotation max. pressure relief valve (55). Refer to chapter “Adjustingthe max. pressure of rotation circuit” for checking the setting of valve (55). If thevalve (55) does not adjust to the recommended value (180 bar), it is likely that thevalve (55) is faulty. In this case, replace the valve and adjust it according to theinstructions in chapter “Adjusting the max. pressure of rotation circuit”. If thepressure still does not adjust to 180 bar, it is likely that the rotation pump (50) isfaulty. Replace the rotation pump (50) and adjust the rotation max. pressure reliefvalve (55) as instructed in chapter “Adjusting the max. pressure of rotation circuit”.

2. If the rotation pressure is lower than normal during drilling, the reason may be thatthe feed pressure is too low or the oil flow to feed is too small. In this situation, thereis a risk of underfeed, and the following points should be checked:

– Install a pressure gauge to the measuring point M1 of the anti–jammingand return automatics block.

– Remove the drill rod.– Start the powerpack.– Lock the control lever of the feed pilot control valve (31) to the rear

position.– If the pressure at the measuring point M1 is approx. 19–21 bar, it is likely

that the feed pressure is insufficient.– If the pressure is well below 19 bar, it is likely that the feed pilot control

valve (31) is faulty. Replace the faulty valve (31).3. If the rotation pressure persistently remains low, it is likely that the rock drill rotation

motor is leaking.– Replace the rock drill rotation motor.



10.17. Rotation pressure too high during drilling1. Too high rotation pressure during drilling may be caused by too high feed pressure

or incorrect drill rod rotation speed.– Refer to chapter “Adjusting rotation speed” for rotation speed adjustment.– Adjust feed pressure so that rotation pressure sets between 80 and 100

bar.2. If the above adjustments did not bring down the rotation speed, it is likely that the

rock drill rotation motor or the rotation mechanism is faulty.– Refer to the rock drill maintenance manuals.

10.18. Rotation speed regulation not working1. If the regulation of rotation speed is not working, start troubleshooting by checking

the rotation speed pilot control pressure. The pressure is checked as follows:– Install measuring adapters and pressure gauges to the pilot control lines a and b

of the rotation directional valve (53).– Turn the rotation speed regulating valve (59) fully closed (clockwise).– Start the powerpack.– Lock the control lever of the rotation pilot control valve (58) into the rear position.– Lock the control lever of the rotation pilot control valve (58) into the front position.– Release the control lever of the rotation pilot control valve (58) to the middle

position.– Stop the powerpack.– If the pilot control lines of the rotation directional valve (53) received an stand

by–pressure, it is likely that the rotation regulating valve (59) is faulty or the spoolof the rotation directional valve (53) is sticking. Check the operation of the valvesas follows:

– Clean and repair, or replace the rotation speed regulating valve (59).– Start the powerpack.– Lock the control lever of the rotation pilot control valve (58) into the rear

position.– Turn the rotation speed regulating knob between extreme positions.– Release the control lever of the rotation pilot control valve (58) to the

middle position.– Stop the powerpack.



– If the rotation speed regulation still did not work, it is likely that the spool of therotation directional valve (53) is sticking. Check the operation of the valve (53) asfollows:

– Stop the powerpack.– Remove the spool of the valve (53).– Clean the spool and the valve housing carefully.– Mount the spool back in place.

2. If the above repairs did not help to remedy the rotation speed regulation, it is likelythat the rock drill rotation motor or the rotation mechanism is faulty.

– Refer to the rock drill maintenance manuals.

10.19. Return automatics fast feed not working

If the rock drill does not start return movement automatically from the front limit, check if thereturn automatics selector switch is in the correct position (middle). If it is, check if the coil Y47of the return automatics selector valve (39) at the anti–jamming and return automatics block isreceiving control voltage.

– If the coil of the valve (39) receives control voltage, it is likely that the valve (39) issticking.

– Clean and repair, or replace the valve.– If the coil of the valve (39) is not receiving control voltage, refer to instructions in

chapter “Electric system troubleshooting”.



10.20. Electric system troubleshooting

Trouble Reason Operation

Pilot control valves fordrilling do not stay on

S70, S71, and S72 donot stay on

–Check power supply fuse–Check power supply feed cable–Check if front limit switch S80 is acti-vated

S72 does not stay onalthough S70 and S71do

–Check that V18 is fitted

–Check position of switch S73 (Returndoes not work in manual position)

–Check operation of front limit pressureswitch S80

Drilling does not stop No automatic return ofrock drill from front end

–Check cable (does relay K70 pull atfront limit)

–Check Y47 operation at front limit (LEDindicator). If LED illuminates, check op-eration of hydraulic system

Drilling stops and rockdrill tries to return, butstops

If forced return works withswitch S73, rear limit S81is maybe damaged

–Check operation of rear limit pressureswitch S81

Forced return not work-ing with switch S73

Switch maybe damaged –Check operation of switch S73

Rock drill rotation stayson after rear end

Time relay K70 maybedamaged

Check operation of time relay K70



10.21. Main reference values (factory settings) for troubleshooting

Object Value

Variable displacement pump (1)– pressure controller– flow controller

225 bar22 bar

Pilot control pressure for rotation, percussion, flushing andfast feed 30 bar

Pilot control pressure for feed 19 – 21 bar

Half–power percussion pressure 100 bar

Full–power percussion pressure• for TF 500– or TTF 500/550– feed

210 bar

Max. pressure of rotation circuit (relief valve (55)) 180 bar

Max fast feed pressure• for TF 500• for TTF 500/550

210 bar180 bar

Anti– jamming sensitivity pressure 120 bar

Max speed forwards (fast feed)• for TF 500• for TTF 500/550

≈ 0.3 m/s≈ 0.3 m/s

Max speed backwards (fast feed)• for TF 500• for TTF 500/550

≈ 0.5 m/s≈ 0.3 m/s

Control pressure of stabilizer 10 bar


S06 THC 560 Axera 5

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