Eaton®Medium Duty Piston Pump

Model 70360 Variable Displacement Piston Pump40,6 cm3/r [2.48 in3/r] or 49,2 cm3/r [3.00 in3/r] DisplacementsManual Controlled -02

Repair Information

December 1998

2

Model 70360

Table of ContentsIntroduction ......................................................................................................... 2Identification ........................................................................................................ 3Tools Required .................................................................................................... 3Parts Drawing ...................................................................................................... 4 - 5Parts List ............................................................................................................. 6 - 7Repair information

Disassembly .................................................................................................. 8 - 10Reassembly ................................................................................................... 11 - 12

Fault - Logic Troubleshooting .............................................................................. 13 - 17Start-up Procedure .............................................................................................. 18

IntroductionThis manual provides service information for Eaton Models 70360 variable displacement piston pumps. Stepby step instructions for the complete disassembly, inspection, and reassembly of the pump are given. Thefollowing recommendations should be followed to insure successful repairs.

Remove the pump from the application.

Cleanliness is extremely important.

Clean the port areas thoroughly before disconnecting the hydraulic lines.

Plug the pump ports and cover the open hydraulic lines immediately after they're disconnected.

Drain the oil and clean the exterior of the pump before making repairs.

Wash all metal parts in clean solvent.

Use compressed air to dry the parts. Do not wipe them dry with paper towels or cloth.

Compressed air should be filtered and moisture free.

Always use new seals when reassembling hydraulic pumps.

Lubricate the new rubber seals with a petroleum jelly (Vaseline®) before installation.

Torque all bolts over gasketed joints, then repeat the torquing sequence to makeup for gasketcompression.

Verifying the accuracy of pump repairs on an authorized test stand is essential.

Introduction

3

Model 70360

Tools Required9/16, 7/8, 1-1/8 in. sockets and/or end

wrenchesTorque wrench (203 N.m [150 lbf.ft] capacity)Ratchet wrench7/16 in. Allen wrench or bit socketInternal and external retaining ring pliersSmall screwdrivers (2)Hammer (soft face)Light Petroleum JellySeal driver or similar tool

Serial Number Code:

A 96 01 31 JBTester's Initials

Day of Month (two digits)

Month (two digits)

Revision level of parts list.

Last two digits of year built.( 91 for 1991 etc.)

Identification Numbers - Manually Variable Displacement Piston PumpIdentification label on control arm side of housing.

A - Product Number Description70360 = Single Piston Pump78362 = Single Piston Pump with Gear Pump78361 = Tandem Piston Pumps78363 = Tandem Piston Pumps with Gear Pump

B - Sequential NumberingC - Engineering Design Code

Single Pump - Product Number:

7 0 3 6 0 - R A A - 02

Tandem Pumps - Product Number:

7 8 3 6 3 - R A B - 02

A

A

B

B

Each order must include the following information.1. Product and/or Part Number2. Serial Number Code3. Part Name4. Quantity

C

C

4

Model 70360

PartsDrawingPump drawn below is typical of a righthand rotation pump.

24-1

28

14

3

12

59

59

10-1

10

6

611

11

9

44

2041

516

1716

5

4

27

Shaft assembly for rear pump of tandem.

27

32

24

5454-1

53

Port(D2)

Port(D2)

53-1

205

1617

4

165

Shaft assembly for single pump or front pump of tandem.

70360-RXX-02

A980131JB

Identification LabelLocated on Control Arm Side

5

Model 70360

PartsDrawing

Note "V" notchlocations Lefthand

RotationRighthandRotation

Valve PlateIdentification

25-1

Used in place of Auxiliary pump.

Refer to Backplate Assembly Identification section for additional backplates.

K2-1

K2-2

K2-3

K1-1K1-2

K1-3

(K3-2)

(K3-1)

(K3-3)

Port (A)

Port(C1)

Port(C1)

Port (S)

Port (C2)

Port (B)

Port (A)

Port (B)

26

25-2

15

2

25

25-3-3

25-3b

227

8-18

237

8-18

38

30

31

39

29

18

19

61

40

25-3

45

29-1

33

3643

K3

K2

37-1

37

25-1

25-2

26

15

2

2522

78-1

8

237

8-18

18

25-3

25-3-325-3-3

25-3b

19

K1Assembly for unit withoutgerotor charge pump.

Assembly for single pump or rear pump of tandem.

25-3-3

6

Model 70360

Parts ListItem Qty. Description

2 2 Dowel Pin3 1 Crush Ring

+ 4 1 Retaining Ring+ 5 2 Retaining Ring

6 6 Screw7 2 Spring8 2 Plug Assembly

+ 8-1 2 O-ring, 2,38 mm Dia. x 22,23 mm I.D. [.0937 in. Dia. x .875 in. I.D.]9 1 Rotating Kit Assembly10 1 Cover Plate SA

+ 10-1 1 Seal, Trunnion Shaft11 6 Washer12 1 Cover Plate SA

1 Bearing Cup14 1 Bearing Cup

+ 15 1 Housing Gasket16 2 Thrust Race17 1 Needle Thrust Bearing18 2 Cap Screws19 2 Cap Screws

+ 20 1 Shaft Seal, Drive20 1 Spacer (Used in rear pump of tandem in place of drive shaft seal.)22 1 Relief Valve for Port "A"23 1 Relief Valve for Port "B"24 1 Housing Assembly24-1 1 Bearing (press fit)25 1 Backplate Assembly26 1 Valve Plate27 1 Drive Shaft28 1 Camplate - Square End Trunnion

2 Bearing Cone29 1 Charge Pump Adaptor30 1 Inner Gerotor31 1 Outer Gerotor32 1 Key, Drive Shaft

+ 33 1 O-ring (In K2 & K3 kit)34 1 Coupler35 1 Mounting Bracket36 1 Cover Plate (In K3 kit)37 1 Plug Assembly

+ 37-1 1 O-ring, 2,21 mm Dia. x 16,36 mm ID. [.087 in. Dia. x .644 in. ID.]38 1 Key, Gerotor Pump Adapter

+ 39 1 Molded O-ring40 2 Washer41 1 Washer42 1 Key, Camplate Trunnion43 2 Cap Screws, Cover Plate (In K3 kit)44 1 Insert, Camplate45 6 Washer53 1 Plug Assembly

+ 53-1 1 O-ring, 2,20 mm Dia. x 16,35 mm ID. [.087 in. Dia. x .644 in. ID.]54 1 Plug Assembly

+ 54-1 1 O-ring, 2,20 mm Dia. x 16,35 mm ID. [.087 in. Dia. x .644 in. ID.]+ 59 2 O-ring, 2,38 mm Dia. x 88,9 mm ID. [.0937 in. Dia. x 3.5 in. ID.]

7

Model 70360

Parts List

Item Qty. Description

Mounting KitsK1 1 Tandem Piston Pump Mounting KitK1-1 1 41T Coupler, 33,02 mm [1.3 in.] long

+ K1-2 1 O-ring, 1,59 mm Dia. x 101,6 mm ID. [.0625 in. Dia. x 4 in. ID.]K1-3 2 Cap ScrewsK2 1 Gear Pump Mounting Kit

+ K2-1 1 O-ring, 1,59 mm Dia. x 82,55 mm ID. [.0625 in. Dia. x 3.25 in. ID.]K2-2 1 WasherK2-3 2 Cap ScrewsK3 1 Cover Plate Kit

+ K3-1 1 O-ring, 1,59 mm Dia. x 82,55 mm ID. [.0625 in. Dia. x 3.25 in. ID.]K3-2 1 Cover PlateK3-3 2 Cap Screws

Seal Repair Kits1 Seal Repair Kit for 70360 piston pump. (Order two for tandem pumps)1 Control Shaft Bearing Shim Kit (to replace crush ring after replacement of major part).

Legend + Common parts to seal repair kits.

8

Model 70360

DisassemblyThe following disassemblyprocedure applies to a single pumpwith or without gear pump Therepair procedure for tandempumps, once they are separated, isbasically the same. The basicconfiguration differences between asingle and tandem pumps are thebackplates, pump shafts andhousing assemblies. In most

cases, only the rear pump of tandem units contain a chargepump, which is common to both the front and rear pump. Therear tandem pump does not incorporate a shaft seal.

Thoroughly clean the Eaton Model 70360 or 78362 variabledisplacement pump before anyrepairs are attempted. Whenworking on tandem pumps,separate the front and rear pumpsfirst.

1 Support the pump with theinput shaft down. Use a 9/16 in.socket or end wrench to removethe pump adapter cover plate orgear pump (see Figure 2).

2 Use a pick or similar tool toremove the adapter cover plate orgear pump o-ring (see Figure 3).

3 Use a 7/16 in. Allen wrench orbit socket remover to remove thecharge pressure relief valve springretainer from the pump adaptorassembly (see Figure 4).

4 Use a pencil magnet or similartool to carefully remove the chargepressure spring and poppet fromthe pump adaptor assembly (seeFigure 5). Use caution not to dropthe charge pump poppet into thepump adaptor assembly.

5 The charge pressure reliefvalve and poppet may be of thestandard or high pressure type. The(6.9 to 10.3 bar [100 to 150 PSI])standard spring and poppet areshown on the bottom and theoptional high pressure (13.7 to20.7 bar [200 to 300 PSI]) springand poppet is shown on the top.The same charge pressure relief valve spring retainer is used

with either the standard or highpressure (see Figure 6).

6 Use a 7/8 in. socket or endwrench to remove the optionalbypass valve assembly from thebackplate (see Figure 7).

7 The internal seal may be replaced by first removing thesmall retaining ring on the end of the bypass valve. Removeand replace the o-rings (see Figure 8).

8 Use a 1-1/16 in. socket or endwrench to remove the two highpressure relief valves from thepumps backplate assembly (seeFigure 9). Each system relief valveassembly is identified by both itspart number and relief valve settingas shown on in Parts InformationManual 06-639.

9 Firmly support the pumpassembly. Use a 9/16 in. socket orend wrench to remove the four capscrews retaining the charge pumpadapter assembly.

10 With the cap screws removed,remove the charge pump adaptorassembly from the backplate (seeFigure 11).

Note: The front pump assembliesdo not have charge pump adapterassemblies.

11 Turn the adapter assemblyover. Use an o-ring pick or similartool remove the o-ring seal (seeFigure 12).

12 Inspect the gerotor pocket and needle bearing located inthe charge pump adapter. The needles in the needle bearingmust remain intact in the bearing cage.

Repair Information

Figure 1

Figure 2

Figure 3

Figure 5

Figure 4

Figure 6

Figure 7 Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

9

Model 70360

13 When the needle bearingassembly is replaced, thenumbered end of the bearing mustface toward the flange side of theadapter to the dimension as shown(see Figure 13).

14 With the charge pump adapterremoved, remove the charge pumpassemblies outer and inner gerotorring. Next, remove the small drivekey from the pump shaft (seeFigure 14 and 15).

15 Charge pumps are available intwo different displacements Chargepump displacements are based onthe thickness of the gerotorassembly and the depth of the pocket located in the chargepump adapter. To determine the displacement, refer to thetable below.

Gerotor Pocket DepthDisplacement Depth of Pocketcm3/r [in3/r] mm [in.]

6.9 [.42] 6.35 [.25]13.8 [.84] 12.7 [.50]

16 To separate the backplateassembly from the dowel pins inthe pump housing assembly, inserttwo screwdrivers betweenbackplate and housing assemblyand pry upward (see Figure 16).

17 After separation, remove thebackplate from the housingassembly.

18 Turn the backplate assemblyover and inspect the needlebearing. The needles in the needlebearing must remain intact in thebearing cage (see Figure 17).

19 When the needle bearingassembly is replaced, thenumbered end of the bearing mustface the valve plate side of thebackplate to the dimension asshown (see Figure 18).

20 With the backplate removed,remove the gasket from the pumphousing assembly and discard (seeFigure 19).

21 Remove the valve plate from the piston block assembly.Note: This valve plate may have stuck to the backplateassembly that was just previously removed.

22 Valveplate directional rotation (CW or CCW) is identifiedby the location of the metering slots located on the face of thevalve plates. Pump inputrotation should always turninto the metering slots (seeFigure 20). A clockwisevalve plate is shown on theleft and a counter clockwisevalveplate is on the right.Note: Whenever pump input rotation is changed, the valveplate must be replaced along with the desired rotation chargepump adapter.

23 Remove the rotating kit assembly by carefully retaining itin the housing assembly. Lift the housing and rotating kitassembly and turn over assemblies allowing the rotating kitassembly to slide down the input shaft and out of the pumphousing.

24 The model 70360 variabledisplacement pumps areavailable in two differentdisplacements. The 40,6 cm3/r[2.48 in3/r] rotating kitassembly is shown below onthe left. The 49,2 cm3/r [3.00 in3/r] rotating kit assembly isshown below on the right. The 49,2 cm3lr [3 00 in3/r] rotatingassembly is easily identified by having larger pistons andcutouts in the spider (see Figure 21).

25 With the rotating kitassembly removed, remove thepiston assemblies, spider andspider pivot from the pistonbarrel (see Figure 22).

26 Inspect the pistonassemblies, spider, spider pivotand piston block. The piston blockassembly usually requires nofurther disassembly unless the pinsor block spring are damaged.

27 When any excessive wear orscratches are noted on the face ofthe piston block, the blockassembly must be replaced (see Figure 23).

DO NOT LAP THE FACE OF PISTON BLOCK ASSEMBLY.

Numbered End

Gerotor Pocket

2.41 mm[.095 in.]

Flange

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

2.79 mm[.110 in.]

1.91 mm[.075 in.]

Numbered End

Figure 18

Figure 19

Figure 20

Figure 21

Figure 22

Figure 23

Repair Information - Disassembly

10

Model 70360

28 To remove the input shaftassembly, use a pair of internalsnap ring pliers and remove theshaft seal retaining ring from thehousing assembly (see Figure 24).

29 With the retaining ringremoved, use a small press topress the shaft seal and input shaftassembly from the housingassembly (see Figure 25).

30 With the input shaft assemblyremoved, disassemble theassembly for inspection byremoving the shaft seal, washer,retaining ring thrust washers andbearing (see Figure 26).

Note: The rear pump on tandemunits uses a spacer in place of shaftseals.

31 To remove the camplate fromthe housing assembly, use a 9/16in. socket or end wrench andremove the three cap screwsretaining the trunnion cover plateassembly. Start at the cover platewith control shaft first (see Figure27).

32 With the retaining cap screwsremoved, insert two smallscrewdrivers in the notches locatedin the cover plate assembly and pryupward. Make sure bearing cupcomes off with the cover plate (seeFigure 28).

Note: The crush ring in the controlarm trunnion cover does not needto be removed (see Figure 29). Theonly time the crush ring needs tobe removed is when either thetrunnion cover, the camplateassembly or the housing assembly is replaced. A shim kit isthen required in the crush rings place.

33 Reposition the pump assembly to remove opposite coverplate. The bearing cup in this cover plate is press fit and notremovable. Repeat steps 31 through 32.

34 With housing in the uprightposition, slide the camplate towardthe control side and lift it from thepump housing (see Figure 30).

Note: The camplate control shaftwill go out either side of the pumphousing. Be sure to note on whichside of the housing the controlshaft protrudes before removing camplate from housing forcorrect reassembly orientation.

35 Use an o-ring pick or similar tool to remove the o-ringseals from the two counter-bores in the housing or the coverplates (see Figure 31).

36 To remove the control sidecover plate lip seal, use a smallpress and press the lip seal inward(see Figure 32).

39 Remove the thrust plate fromthe camplate. The thrust plate is reversible and either side mayface the camplate (see Figure 33).

40 Inspect the housingassemblies front needle bearing. Ifthe needles remain in their cageand move freely, replacementusually is not required (see Figure34).

41 When the needle bearing isreplaced, the numbered end of theneedle bearing must face awayfrom the housing and pressed tothe dimension as shown (see Figure35).

Figure 24

Figure 25

Figure 26

Figure 27

Repair Information - Disassembly

Figure 32

Figure 34

1.78 mm[.07 in.]

Numbered EndFlange End of Housing

Figure 35

Figure 28

Figure 29

Figure 30

Figure 31

Figure 33

11

Model 70360

Reassembly1 Before reassembling the pump, replace all worn anddamaged parts, assemblies, seals and o-rings. Lubricate theseals and o-rings with petroleum jelly to help retain themduring reassembly and to provide lubrication to the input andcontrol shaft seals. Lubricate all finished part surfaces freelywith clean hydraulic fluid to help provide start up lubricationbetween all rotating parts.

2 To reassemble the camplateassembly into the pump housing,tilt the camplate slightly and installthe control side of the camplatethrough the previously noted ormarked side of the housingassembly (see Figure 36).

3 With the camplate installed,lubricate the tapered bearing on thenon-control arm side of thecamplate.

4 Lubricate and install the o-ringseal into counter-bore of housing(see Figure 37).

5 Install the trunnion cover overbearing and onto pump housing.Install the three cap screws andtorque to 40,7 Nm [30 ft. lbs.] (seeFigure 38).

6 Lubricate and install thecontrol arm shaft seal into thecontrol arm trunnion cover. Installwith the lip of the seal facingupward or to the inside of thepump (see Figure 39).

7 If the housing, trunnion covers or camplate assembly havenot been replaced, the existing crush ring may be re-used. Ifyou have replaced anyone of the above a shim kit must replacethe crush ring. See Parts Information manual 06-639.

8 Place the bearing cup into trunnion cover over the crushring or shims (see Figure 40).

9 Lubricate and install the o-ringseal into counter-bore of housing(see Figure 41).

10 Install the trunnion cover overthe control shaft and into the pumphousing. Install the three retainingcap screws and torque to 40,7 Nm[30 ft. lbs.] (see Figure 42).

11 Using your fingers, tilt thecamplate back and forth to checkthe trunnion bearing preload.Proper preload is achieved whenthe camplate has a very slighttilting resistance. The camplatemust not have any side clearance.

12 Reassemble the input shaftassembly by installing the thrustwasher, thrust bearing, secondthrust washer, retaining ring,washer and shaft seal (see Figure43).

Note: The lip of the shaft seal mustpoint toward the center of the inputshaft.

13 Install the input shaft assemblyinto the housing assembly. Pushthe shaft seal in just far enough soyou can start the shaft sealretaining ring.

14 Use a pair of snap ring pliersto install retaining snap ring intothe housing assembly (see Figure44).

15 Use a seal driver or similar toolto press or drive the snap ring andseal into the housing assembly (seeFigure 45).

CAUTION! Press or drive inward until the snap ring snaps intothe snap ring groove located in the pump housing assembly.

16 The thrust plate is reversible. Either side will fit into thecamplate. In most cases if any irregularities are noted it is bestto replace the thrust plate (seeFigure 46).

17 Lubricate and install thethrustplate over the input shaftassembly and into the camplate.The thrustplate must rest firmly inits pocket located in the camplate.

Figure 38

Figure 42

Figure 43

Figure 44

Figure 45

Repair Information

Figure 39

Figure 37

Figure 36

Figure 41

Figure 40

Figure 46

12

Model 70360

18 Reassemble the rotating kitassembly by first aligning thesplines in the pivot with the splinesin the block. Install the pivot on theblock assembly pins (see Figure47).

19 Use a small socket or similartool to help retain the pivot in thecentered position. Lubricate andinstall the spider and pistonassemblies onto the pivot andpistons into the piston blockassembly (see Figure 48).

20 Hold the housing assembly inthe vertical position then carefullyinstall the rotating kit by firstaligning with the splines on theinput shaft. With splines aligned,install the rotating kit into the pumphousing (see Figure 49). Usecaution to ensure all parts are keptin their proper position.

21 With the rotating kit installed,reposition the housing assembly inthe input shaft down position andinstall a new housing gasket (seeFigure 50).

22 Lightly coat the backplate sideof the valve plate with petroleumjelly for retention during assembly.Install the valve plate over theneedle bearing, aligning the smallslot on the outside of the valveplate with the dowel pin in thebackplate (see Figure 51).

23 Carefully install the backplateassembly by aligning it with thedowel pins located in the pumphousing. Use caution not todislodge the valve plate (see Figure52).

24 Lightly coat the charge pumpassemblies drive key withpetroleum jelly and install it in thedrive shaft assembly (see Figure53).

25 Align the keyway of thegerotor’s inner ring, then lubricateand install the inner ring and outer

ring over the input shaft and ontothe backplate assembly (see Figure54).

Note: Before installing the chargepum adaptor plate, offset the outerring of the geroter as shown.

26 With the gerotor assemblyinstalled, install new o-ring intocharge pump adapter plate andplace adapter onto backplate overgerotor. Retain with cap screws.Torque cap screws to 52,9 to 56 Nm[39 to 42 ft. lbs.] (see Figure 55).

27 Install the two high pressurerelief valves. Torque valves 128,8 to142,4 Nm [95 to105 ft. lbs.] (seeFigure 56).

28 Lubricate and reassemble thebypass valve assembly. Install thebypass valve into the backplate.Torque valve to 36,6 to 40,6 Nm[27 to 30 ft. lbs.] (see Figure 57).

29 Coat the charge pressurepoppet with petroleum jelly andplace poppet onto spring and installinto the adapter plate (see Figure58).

30 Install the hollow chargepressure relief valve retainer intothe adapter plate. Torque retainerto 6,8 to 9,5 Nm [5 to 7 ft. lbs.].

31 Lubricate and install the o-ringon the cover plate or gear pump.Install the cover plate or gear pumpand two cap screws. Torque capscrews to 36,6 to 40 Nm [27 to 31ft. lbs.].

The Model 70360 or 78362 variable displacement pump is nowready for test and reinstallation.

Figure 47

Figure 48

Figure 49

Figure 50

Figure 51

Figure 52

Figure 54

Figure 55

Figure 56

Figure 57

Figure 58

Repair Information - Reassembly

Figure 53

13

Model 70360

70360-RXX-02

A980131JB

1

Inspect?

Repairor

Replace

Defective

ActionStep

CommentNumber

Decision

Solution

Symptom:

Gauges RecommendedInlet vacuum gauge: 2 bar to 1 bar [30 PSI to 30 inHg]System pressure gauge: 700 bar [10,000 PSI]Charge pressure gauge: 0 to 50 bar [0 to 600 PSI]Case pressure gauge: 0 to 25 bar [0 to 300 PSI]

ExplanatoryDiagram

This fault - logic troubleshooting guide is adiagnostic aid in locating transmission problems.

Match the transmission symptoms with the problemstatements and follow the action steps shown in thebox diagrams. This will give help in correcting minorproblems eliminating unnecessary machine downtime.

Following the fault - logic diagrams are diagramaction comments of the action steps shown in thediagrams. Where applicable, the comment number ofthe statement appears in the action block of thediagrams.

Recommended Gauge Locations

Figure 59

Pressure PortsTee In Line to CheckSystem Pressure

Charge Pump Suction PortTee In Line to Check InletVacuum

Drain PortTee In Line to CheckCase Pressure

Auxiliary PortCheck Charge Pressure

Fault - Logic Troubleshooting

Identification LabelLocated on Control Arm Side

14

Model 70360

Fault - Logic Troubleshooting

InspectServo Control

(If used)OK

1 2

InspectExternal Control

Linkage

Defective

Repairor

Replace

Defective

Repairor

Replace

Symptom: Neutral Difficult or Impossible to Find

InspectHeat

ExchangerOKOK OK

4 5 6

CheckOil Level inReservoir

Fill toProperLevel

DefectiveBelow Level

Repairor

Replace

CheckSystem

Pressure

ReduceSystemLoad

High

OK9

InspectCharge Relief

ValveOK

11

InspectChargePump 13

InspectMotor

12

InspectInlet Screen

or Filter

Replace

Clogged

OK8

CheckCharge

Pressure10

Low OK

OK

ReplacePump &Motor

Inspect PumpBypass Valve

(If used)OK

7

Inspect HeatExchanger

Bypass Valve(If used)

OK

Defective

Repairor

Replace

Defective

Repairor

Replace

Defective

Repairor

Replace

Defective

Repairor

Replace

Defective

Repairor

Replace

Symptom: System Operating Hot

15

Model 70360

InspectServo Control

(If used)OK OK

1 2 3

InspectExternal Control

Linkage

Defective

Repairor

Replace

InspectSystem Relief

Valves

Defective

Repairor

Replace

Defective

Repairor

Replace

Symptom: Operates in One Direction Only

InspectServo Control

(If used)OKOK OK

2 7

Defective

Repairor

Replace

InspectMotor

12

Replace

Clogged

CheckCharge

Pressure10

Low OK

Inspect PumpBypass Valve

(If used)

ReplacePump &Motor

Defective

Repairor

Replace

InspectInlet Screen

or FilterOKOK OK

8 13

Defective

Repairor

Replace

InspectCharge Relief

Valve11

InspectChargePump

Defective

Repairor

Replace

Defective

Repairor

Replace

Symptom: System Response Sluggish

Fault - Logic Troubleshooting

16

Model 70360

Check ExternalControlLinkage

OKOK OK4 1 7

CheckOil Level inReservoir

Fill toProperLevel

DefectiveBelow Level

Repairor

Replace

CheckSystem

PressureOK

9

InspectCharge Relief

ValveOK

11

InspectChargePump 13

InspectMotor

12

InspectInlet Screen

or Filter

Replace

Clogged

OK8

CheckCharge

Pressure10

Low OK

OK

ReplacePump &Motor

InspectServo Control

(If used)OK

2

Inspect PumpBypass Valve

(If used)

OK

Defective

Repairor

Replace

Defective

Repairor

Replace

Defective

Repairor

Replace

Defective

Repairor

Replace

Defective

Repairor

Replace

High

ReduceSystemLoad

Symptom: System Will Not Operate In Either Direction

Fault - Logic Troubleshooting

17

Model 70360

Diagram Action Step Comments

1 Inspect External Control Linkage for:a. misadjustment or disconnectionb. binding, bending or breakagec. misadjusted, damaged or broken neutral return spring

2 Inspect Servo Control Valve for: (if used)a. proper inlet pressureb. misadjusted, damaged or broken neutral return springc. galled or stuck control spoold. galled or stuck servo piston

3 Inspect System Relief Valves* for:a. improper pressure relief settingb. damaged or broken springc. valve held off seatd. damaged valve seat

4 Check Oil Level in Reservoir:a. consult owner/operators manual for the proper type

fluid and level

5 Inspect Heat Exchanger for:a. obstructed air flow (air cooled)b. obstructed water flow (water cooled)c. improper plumbing (inlet to outlet)d. obstructed fluid flow

6 Inspect Heat Exchanger Bypass Valve for: (if used)a. improper pressure adjustmentb. stuck or broken valve

7 Inspect Pump Bypass Valve for: (if used)a. held in a partial or full open position

8 Inspect Inlet Screen or Filter for:a. plugged or clogged screen or filter elementb. obstructed inlet or outletc. open inlet to charge pump

9 Check System Pressure:a. See figure 59 for location of pressure gauge installation.b. consult owner/operators manual for maximum system

relief valve settings

10 Check Charge Pressure:a. See figure 59 for location of pressure gauge installation.b. consult owner/operators manual for maximum charge

relief valve settings

11 Inspect Charge Relief Valve for:a. improper charge relief pressure setting *b. damaged or broken springc. poppet valve held off seat

12 Inspect Motor for:a. disconnected coupling

13 Inspect Charge Pump for:a. broken or missing drive keyb. damaged or missing o-ringc. excessive gerotor clearanced. galled or broken gerotor set

* System/Charge Relief Valve Pressure Settings for Eaton’sVariable Displacement Controlled Piston Pumps

Inlet Vacuum 6 inHg max.Case Pressure 25 PSI maximumCharge Pressure 100 to 150 PSI Standard

200 to 250 PSI Optional250 to 300 PSI Optional

System Pressure 5000 PSI maximum3000 PSI continuous

The high pressure relief valves are all factory preset andcannot be readjusted.

The pressure setting and assembly number is stamped oneach high pressure relief valve cartridge.

Valve Identification Example:

32060-IA 5000

Relief Valve Setting

Relief Valve Assembly Number

Fault - Logic Troubleshooting

18

Model 70360

When initially starting a new or rebuilt transmission system, itis extremely important to follow the start-up procedure. Itprevents the chance of damaging the unit which might occur ifthe system was not properly purged of air before start-up.

1 After the transmission components have been properlyinstalled, fill the pump housing at least half full with filteredsystem oil. Connect all hydraulic lines and check to be surethey are tight.

2 Install and adjust all control linkage.

3 Fill the reservoir with an approved oil that has been filteredthrough a 10 micron filter. Refer to Eaton HydraulicsTechnical Data sheet number 3-401 titled Hydraulic FluidRecommendations.

4 Gasoline or L.P. engines: remove the coil wire and turn theengine over for 15 seconds. Diesel engines: shut off thefuel flow to the injectors and turn the engine over for 15seconds.

5 Replace the coil wire or return the fuel flow to the injectors.Place the transmission unit in the neutral position, start theengine and run it at a low idle. The charge pump shouldimmediately pick up oil and fill the system. If there is noindication of fill in 30 seconds, stop the engine anddetermine the cause.

6 After the system starts to show signs of fill, slowly movepump camplate to a slight cam angle. Continue to operatesystem slowly with no load on motors until systemresponds fully.

7 Check fluid level in the reservoir and refill if necessary tothe proper level with an approved filtered oil.

8 Check all line connections for leaks and tighten ifnecessary.

The machine is now ready to be put into operation.

Frequent filter changes are recommended for the first twochanges after placing the machine back into operation. Changethe first filter in 3-5 hours and the second in approximately 50hours. Routinely scheduled filter changes are recommendedfor maximum life of the hydraulic system.

Start-up Procedure

19

Model 70360

© 2008 Eaton CorporationAll Rights ReservedPrinted in USADocument No. E-PUPI-TS016-ESupersedes 07-627January 2009

EatonFluid Power GroupHydraulics Business USA14615 Lone Oak RoadEden Prairie, MN 55344USATel: 952-937-9800Fax: 952-294-7722www.eaton.com/hydraulics

EatonFluid Power GroupHydraulics Business EuropeRoute de la Longeraie 71110 MorgesSwitzerlandTel: +41 (0) 21 811 4600Fax: +41 (0) 21 811 4601

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