RENR7528-04July 2012

D8T Track-Type TractorHydraulic SystemJ8B1-2393KPZ1-3626

Printed in U.S.A. 2012 Caterpillar, All Rights Reserved

ONE POSITION TWO POSITION THREE POSITION

VENTED PRESSURIZED RETURN ABOVE FLUID LEVEL RETURN BELOW FLUID LEVEL

LINES CROSSING LINES JOINING

TWO - WAY THREE - WAY FOUR - WAY

SPRING CONTROL VALVES RESTRICTION LINE RESTRICTION(FIXED)

PUMP(2 - SECTION)

SPRING(ADJUSTABLE)

VARIABILITY LINE RESTRICTION(VARIABLE)

PRESSURECOMPENSATION

PUMP(VARIABLE & PRESSURE

COMPENSATED)

MEASUREMENT

PRESSURE TEMPERATURE FLOW

ROTATING SHAFTS

UNIDIRECTIONAL BIDIRECTIONAL

PUSH - PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING

FIXEDDISPLACEMENT

VARIABLE DISPLACEMENTNON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

VALVE ENVELOPES VALVE PORTS

FLUID CONDITIONERPUMP OR MOTOR

FLUID POWER SYMBOLS

UNIDIRECTIONAL

BIDIRECTIONAL

RELEASED PRESSURE

EXTERNAL RETURN INTERNAL RETURN

REMOTE SUPPLY PRESSURE

SIMPLIFIED

HYDRAULIC PUMPS

ACCUMULATORS

SPRING LOADED GAS CHARGED

SOLENOID OR MANUAL

SOLENOID & PILOT

SOLENOID &PILOT OR MANUAL

SOLENOID SERVO THERMAL DETENT

HYDRAULIC & PNEUMATIC CYLINDERS

DOUBLE ACTINGSINGLE ACTING

BASICSYMBOL

SPRINGLOADED

CHECK VALVES

2 POSITIONINFINITE

POSITIONING

FLOW IN ONEDIRECTION

FLOW INEITHER

DIRECTION

3 POSITION

CROSSFLOW

PARALLELFLOW

INTERNAL PASSAGEWAYS

NORMAL POSITION

A B

P T

A B

P TSHIFTED POSITION INFINITE POSITION

CONTROL VALVES

ATTACHMENT

MANUAL SHUTOFF

SHUTTLE PILOTCONTROLLED

MAIN AUX

LINE RESTRICTION(VARIABLE & PRESSURE

COMPENSATED)

MANUAL CONTROL SYMBOLS

HYDRAULIC MOTORS

FLUID STORAGE RESERVOIRS

CROSSING & JOINING LINES

VALVES

PILOT CONTROL SYMBOLS

COMBINATION CONTROLS

BASIC COMPONENT SYMBOLS

ENERGY TRIANGLESHYDRAULIC PNEUMATIC

INTERNALSUPPLY PRESSURE

COMPLETE

FIXEDDISPLACEMENT

VARIABLE DISPLACEMENTNON-COMPENSATED

HYDRAULIC SYMBOLS (ELECTRICAL)

ELECTRICAL SYMBOLS TABLE

325-AG135 PK-14

HARNESS IDENTIFICATION CODE THIS EXAMPLEINDICATES WIRE 135 IN HARNESS AG

325-PK-14

WIRE GAUGE

WIRE COLOR

CIRCUIT NUMBERIDENTIFICATION

WIRE NUMBER IDENTIFICATION CODES

CURRENT STANDARD

PREVIOUS STANDARD

ELECTRICAL SCHEMATIC EXAMPLE HYDRAULIC SCHEMATIC EXAMPLE

325-PK

WIRE COLORCIRCUIT NUMBER

IDENTIFICATION

B

WIRE

WIRE

(EXAMPLE VALVE)

CURRENT STANDARD

TRANSDUCER(FLUID)

MELECTRIC MOTORTRANSDUCER

(GAS / AIR)

G

GENERATOR

PRESSURE SWITCH ELECTRICAL WIREPRESSURE SWITCH(ADJUSTABLE)

TEMPERATURESWITCH

PRESSURESWITCH

TEMPERATURESWITCH

LEVELSWITCH

FLOWSWITCH

ELECTRICAL SYMBOLS (ELECTRICAL)

A

CIRCUIT NUMBERIDENTIFICATION

WIRECOLOR

WIRE GAUGE

T

RE

NR

7528-0

43

0 P

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(Dim

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: 3

9 i

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es

)

HDHCX2

X1

HFPD

HPDL 13HPTR HPRR HPSIHB

HA

HA

HB

HPDL

HPTR

HPRR

HPSI

HPS

12

HPAP

IMPLEMENT CONTROL VALVES

HPAPCP1

HPSCP2

External Resolver

Solenoid Inlet Manifold

Solenoid

End Cover

Main Relief Valve

ChargingValve

FRONT VIEW

REAR VIEW

Blade Lift Control ValveBlade Tilt Control Valve

Ripper Lift Control Valve

Ripper Tip Control Valve

Accumulator

Pilot Oil Filter

Pressure Reducing Valve(Call Out 12)

Pilot Manifold

Pilot Oil Filter

36

Dual Tilt Valve Solenoid

24

25

37

29

27

28

33 32 649 11 1 2 50 23

24

5 40

39 9

47

3 74 51

45

30

2928

16

15

18 1720 19

42

13

44 43

31

46

14

27

1012 8

3448

WINCH

(36) Dual Tilt Valve (Attachment)

23

COMPONENT LOCATIONS

10

9

Pin Puller Solenoid(31) Pin Puller Valve (Attachment)

31

(9) Thermal Bypass Valve(10) Hydraulic Oil Cooler

1

(1) Steering, Charge and Fan Drive Pump

Fan Drive PumpSteering Charge PumpSteering Pump

35

41

52

53

38

HPDR HPTL

HPSO

HPWO HPWI

HPRL

Check Part Numbers in the Parts Manuals for your Specific Machine.

Description PartNumberMachineLocation

SchematicLocation

Pump Gp - Steering, Charge & Fan Drive 212-0271 1 D-3Pump Gp - Piston (Steering) 205-1823 2 D-3Pump Gp - Piston (Fan) 204-2578 3 D-2Motor Gp - Steering 252-5127 4 D-4Motor Gp - Fan Motor With Anticav Valve 205-1821 5 E-1Filter Gp - Steering Pump Charge 211-6053 6 C3Pump Gp - Piston (Implement) 214-1091 7 B-2Valve - In-line Resolver "T" 233-6942 8 E-7, F-5Valve - Cooler Bypass 124-8335 9 D-1Core As - Oil Clr 209-8380 10 D-1Manifold - Suction Gallery 209-1392 11 B-2

Manifold Gp - Cont (Manifold & Pilot Pressure Reducing Valve) 301-2269 12 B-5, C-7

Accumulator 200-0750 13 B-5, C-7Filter As - Hyd (Pilot System) 126-1813 14 B-4, C-6Valve Gp - Dozer Lift/Tilt 238-2753Valve Gp - Dozer Lift/Tilt, Ripper Lift/Tip 215-5615Manifold Gp - Implement Valve Inlet 213-4325 16 E-7, F-4Valve Gp - Dozer Lift 212-6322 17 E-7, F-4Valve Gp - Dozer Tilt 212-6323 18 D-7,EF-4Valve Gp - Ripper Lift 212-6324 19 C-4Valve Gp - Ripper Tip 212-6324 20 B-4Cover 211-1751 21 B-5, C-7Manifold - Tank Return 247-7788 22 C-4Valve Gp - Dozer Quick Drop 234-3042 23 F-3Cyl Gp - Lift 250-5861Cyl Gp - Lift With Position Sensor 222-1222Cyl Gp - Tilt 240-7347 25 E-2Manifold- Ripper Cylinder Supply And Return 211-9491 26 B-5Cyl Gp - Ripper (Raise) 155-3653 27 B-6, C-6Cyl Gp - Ripper Tip (Rh) 165-0102 28 C-6Cyl Gp - Ripper Tip (Lh) 155-3652 29 B-6Cyl Gp- Pin Puller 6E-3113 30 A-6Valve Gp - Pin Puller Control 188-6140 31 A-6Tank 209-6686 32 A-3Valve - Tank Pressure And Vacuum Relief (Plastic) 116-2810 33 A-4Valve Gp - Cold Oil Relief 198-9220 34 B-2Valve - Check 4E-1437 35 E-2

Valve Gp - Dual Tilt Valve 217-4326 36 F-2Cyl Gp - Dual Tilt 241-0550 37 F-2Cyl Gp - Dual Tilt-Angle Blade 6E-0397 38 A-3

Valve Gp - Fan Motor Reversing 162-2191 39 F-1

Motor Gp - Fan Motor Without Anticav Valve 205-1820 40 E-1

Pump Gp-fan 319-3593 41 D-2

Valve Gp - Dozer Lift/tilt, Winch 215-6822 42 E-7Valve Gp - Cont (Winch) 213-4326 43 D-7Manifold Gp 191-1443 44 D-7Winch Ar 216-9006 45 D-8

Sensor Gp - Pressure (Pressure Transducer-Implement Pump) 237-0957 46 B-5, C-7

Sensor Gp - Pressure(Pressure Transducer-Steering Charge) 224-4535 47 C-3

Switch As - Differential Pressure( Steering Charge Filter) 253-2673 48 C-3

Sensor Gp -Temp (Hydraulic Tank-2 Wire Passive Temp Sensor) 145-7028 49 B-3Sensor Gp - Pressure (Pressure Transducer-Fan Pump) 237-0957 50 B-2Sensor Gp - Speed / Direction (Steering Motor) 204-6204 51 D-4

Valve Gp- 5 Section Valve Stack 238-2755 52 F-4Valve Gp- Aux Valve Section 273-5019 53 C-4, D-4, E-4

ATTACHMENTS

DUAL TILT OPTION

REVERSING FAN OPTION

WINCH OPTION

ELECTRICAL COMPONENTS

Component Location

15 F-4

24 F-3

TapNumber Description

SchematicLocation

HA Imp Pump Pressure E-7, F-5HB Imp Pump - Signal E-7, F-5

HPAP (CP1) Hyd Pilot Accumulator Pressure C-7, A-5HPS (CP2) Regulated Pilot Pressure C-6, A-4SLP (HC) L Steering Loop-Motor D-4SRP (HD) R Steering Loop-Motor D-4SOS (F) Charge Pump Discharge Pressure C-3

X1 Right Steer Actuator D-3X2 Left Steer Actuator D-3

HPDR Hyd Pilot Dozer Raise E-6, F-4HPDL Hyd Pilot Doer Lower E-7, F-5HPTR Hyd Pilot Tilt Right D-7, E-5HPTL Hyd Pilot Tilt Left D-6, E-4HPRR Hyd Pilot Ripper Raise C-5HPRL Hyd Pilot Ripper Lower C-4HPSO Hyd Pilot Ripper Tip-out B-4HPSI Hyd Pilot Ripper Tip-in B-5HFPD Hyd Fan Pump Discharge E-2HPWO Hyd Pilot Winch Out D-6HPWI Hyd Pilot Winch In D-7

Tap LocationPressure and Sampling

22

SOSF

STEERING PUMP / MOTOR

STEERING PUMP STEERING MOTOR

TOP DOWN VIEW

RE

NR

7528-0

43

0 P

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(Dim

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Components are shown installed on a fully operable machine with the key and engine off, transmission shifterin neutral and with parking brake set.Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.

SCHEMATIC PART NUMBER: 209-9744, CHANGE: 11, VERSION: -MEDIA NUMBER: RENR7528-04 THIS SCHEMATIC IS FOR THE D8T TRACK-TYPE TRACTOR HYDRAULIC SYSTEM

12345678

A

B

C

D

E

F

12345678

A

B

C

D

E

F

LINE PATTERNS

Drain / Return Lines

Component Group

Pilot / Load Sensing Pressure

Pressure Line

CALLOUTS

Taps (Pressure, Sampling, Sensor - by letter)YY

(52) VALVE GP - CONTROL138-1234

Callout Number(Machine Location from

Component LocationsTable)

ComponentName

Part Number

AUXILIARY VALVE SECTION

HYDRAULIC CIRCUIT COLOR DESCRIPTIONSIMPLEMENT PUMP OUTPUTPILOT PUMP OUTPUT

LOAD SENSING

SUPPLY LINEDRAIN / RETURN LINESTEERING AND CHARGE PUMP OUTPUTRIPPER CYLINDERS / WINCH UNIT (IF EQUIPPED)

FAN PUMP OUTPUT / RIPPER PIN PULLER

LIFT CYLINDERS

SINGLE AND DUAL TILT CYLINDERS

SLPHC X1 X2

HPDR

HPDL

HPTL

HPRL

HPRR

HPSO

HPSI

CP2HPS

CP1HPAP

HB

HA

HPTR

MACHINE ARRANGEMENTS

WINCH SYSTEM OPTION

STANDARD ARRANGMENT

HPDR

HPTL

HB

HPDL

HA

HPTR

HPW1

CP2HPS

CP1HPAP

WINCH UNIT

RIPPER PIN PULLER

FAN REVERSING VALVE OPTION

C2

T2T

(T2)

DUAL TILT CYLINDER OPTION

TILT LTILT R

SINGLE TILT CYLINDER

P C1

HFPDSRPHD

SOSF

DRIVESHAFTTO PTO PUMP

DOZER TILT

DOZER LIFT

W1

W2T1

DOZER LIFT

DOZER TILT

WINCH

HPW0

PBYRETURN

W

X

G

DC

X

T

T

R1 R1

P

R0 R0

PC1

T2

C2

T

RAISE

LOWER

WINCH SYSTEM OPTION

T2

(8) IN-LINE RESOLVER VALVE "T"233-6942

(8) IN-LINE RESOLVER VALVE "T"233-6942

(45) WINCH ARRANGEMENT216-9006

(44) MANIFOLD GP216-9006

(46) PRESSURE SENSORPRESSURE TRANSDUCER

IMPLEMENT PUMP)237-0957

(43) WINCH CONTROL VALVE

213-4326

(14) PILOT SYSTEM FILTER126-1813

(17) DOZER LIFT CONTROL VALVE

212-6322

(16) IMPLEMENT INLET MANIFOLD VALVE

213-4325

RAISE

LOWER

TILT LTILT R

(32) TANK209-6686

(30) PIN PULLER CYLINDER6E-3113

(31) PIN PULLER CONTROL VALVE

188-6140

(33) TANK PRESSURE ANDVACUUM RELIEF VALVE (PLASTIC)116-2810

AIR RELIEF

VACUUM RELIEF

BREATHER FILTER

(13) ACCUMULATOR200-0750

(14) PILOT SYSTEM FILTER126-1813

(46) PRESSURE SENSORPRESSURE TRANSDUCER

IMPLEMENT PUMP)237-0957

(26) RIPPERCYLINDER SUPPLY AND RETURN MANIFOLD211-9491

(29) RIPPER TIP CYLINDER (LH)

155-3652

(28) RIPPER TIP CYLINDER (RH)

165-0102(27) RIPPERCYLINDER (RAISE)155-3653

(19) RIPPER LIFT CONTROL VALVE212-6324

(53) VALVE GPAUX VALVE SECTION

273-5019

(53) VALVE GPAUX VALVE SECTION

273-5019

(53) VALVE GPAUX VALVE SECTION

273-5019

(18) DOZER TILT CONTROL VALVE

212-6323

(18) DOZER TILT CONTROL VALVE

212-6323

(17) DOZER LIFT CONTROL VALVE

212-6322

(16) IMPLEMENT INLET MANIFOLD VALVE

213-4325

(52) VALVE GP5 SECTION VALVE STACK273-5019 (37) DUAL TILT

CYLINDER241-0550

(38) DUAL TILTCYLINDER ANGLE BLADE6E-0397

(38) DUAL TILTCYLINDER ANGLE BLADE6E-0397

(25) TILT CYLINDER (STANDARD)240-7347

(39) FAN MOTOR REVERSING VALVE162-2191

(34) COLD OIL RELIEF VALVE198-9220

(47) PRESSURE SENSOR (PRESSURE TRANSUCER-STEERING CHARGE)224-4535

(48) DIFFERENTIAL PRESSURE SWITCH(STEERING CHARGE FILTER253-2673

(6) STEERING PUMP CHARGE FILTER

211-6053

(35) VALVE CHECK4E-1437

(5) PISTON MOTOR (FAN MOTORWITH ANTICAV VALVE)205-1821

(40) PISTON MOTOR (FAN MOTORWITHOUT ANTICAV VALVE)205-1820

(9) COOLERBYPASS VALVE124-8335

(10) OIL COOLER209-8380

(7) PISTON PUMP (IMPLEMENT)214-1091

(12) MANIFOLD ANDPILOT PRESSUREREDUCING VALVE301-2269

(13) ACCUMULATOR200-0750

(21) COVER211-1751

(42) DOZER LIFT/TILT, WINCH VALVE215-6822

(12) MANIFOLD ANDPILOT PRESSUREREDUCING VALVE

301-2269

(20) RIPPER TIPCONTROL VALVE212-6324

(21) COVER211-1751

(27) RIPPERCYLINDER (RAISE)155-3653

(15) DOZER LIFT/TILT VALVE238-2753

DOZER LIFT/TILT, RIPPER LIFT/TIP VALVE

215-5615

(23) DOZER QUICKDROP VALVE234-3042

(24) LIFT CYLINDER250-5861LIFT CYLINDERWITH POSITION SENSOR222-1222

(36) DUAL TILTVALVE

217-4326

(11) MANIFOLD SUCTIONGALLERY209-1392

(49) TEMP SENSOR (HYDRAULIC TANK-2 WIRE

PASSIVE TEMP SENSOR)145-7028

(22) MANIFOLD TANK RETURN247-7788

(4) PISTON MOTOR(STEERING)252-5127

(51) SPEED / DIRECTIONSENSOR (STEERING MOTOR)204-6204

(1) STEERING, CHARGE AND FAN DRIVE PUMP212-0271

(2) PISTON PUMP (STEERING)205-1823

(50) PRESSURE SENSOR (PRESSURE

TRANSDUCER-FAN PUMP)

237-0957

(41) FAN PUMP319-3593

(3) PISTON PUMP(FAN)

204-2578

B A

AUX1

PORT APORT B

AUX2

PORT APORT B

AUX3

PORT APORT B

D

LOWERRAISE

PBYRETURN

W

TIP IN

TIP OUT

RIPPER LIFT

RIPPER TIP

D

PRESSURESUPPLIED BYTRANSMISSION

P

T