RE

NR

36

80

-01

VO

L1

16

Pa

ge

Volume 1 - with Ripper

RENR3680-01August 2005

D8R Track-Type TractorHydraulic SystemAKA1-UP6YZ1-UP

© 2005 CaterpillarAll Rights Reserved

Printed in U.S.A.

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)

2-SECTION PUMP

MAIN AUX.

SPRING(ADJUSTABLE)

VARIABILITY LINE RESTRICTION(VARIABLE)

LINE RESTRICTIONVARIABLE and PRESSURE

COMPENSATED

PRESSURECOMPENSATION

PUMP: VARIABLE andPRESSURE COMPENSATED

ENERGY TRIANGLESHYDRAULIC PNEUMATIC

MEASUREMENT

PRESSURE TEMPERATURE FLOW

ROTATING SHAFTS

UNIDIRECTIONAL BIDIRECTIONAL

PUSH-PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING

MANUAL CONTROL SYMBOLS

HYDRAULIC MOTORS

FIXEDDISPLACEMENT

VARIABLE DISPLACEMENTNON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

HYDRAULIC PUMPS

FLUID STORAGE RESERVOIRS

CROSSING AND JOINING LINES

VALVE ENVELOPES VALVE PORTS

BASIC COMPONENT SYMBOLS

FLUID CONDITIONERPUMP or MOTOR

FLUID POWER SYMBOLS

FIXEDDISPLACEMENT

VARIABLE DISPLACEMENTNON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

VALVES

PILOT CONTROL SYMBOLSRELEASED PRESSURE

EXTERNAL RETURN INTERNAL RETURN

REMOTE SUPPLY PRESSURE

SIMPLIFIED COMPLETE INTERNALSUPPLY PRESSURE

ACCUMULATORS

SPRING LOADED GAS CHARGED

SOLENOIDor MANUAL

SOLENOIDand PILOT

SOLENOID andPILOT or MANUAL

COMBINATION CONTROLS

SOLENOID SERVO THERMAL DETENT

HYDRAULIC AND PNEUMATIC CYLINDERS

DOUBLE ACTINGSINGLE ACTING

BASICSYMBOL

SPRINGLOADED

CHECK VALVES

TWOPOSITION

INFINITEPOSITIONING

FLOW IN ONEDIRECTION

FLOW ALLOWED INEITHER DIRECTION

THREEPOSITION

CROSSFLOW

PARALLELFLOW

INTERNAL PASSAGEWAYS

NORMAL POSITION

A B

P T

A B

P TSHIFTED POSITION INFINITE POSITION

CONTROL VALVES

ATTACHMENT

MANUAL SHUTOFF

SHUTTLE PILOTCONTROLLED

Hydraulic Symbols (Electrical)

Electrical Symbols Table

325-AG135 PK-14

Circuit IdentificationNumber

Wire Color Wire Gauge

Harness identification codeThis example indicateswire 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 NumberIdentification

B A

Wire

Wire

(EXAMPLE VALVE)

Current Standard

Transducer(Fluid)

Transducer(Gas / Air)

G

Generator

Electrical WirePressure Switch

MElectric Motor

Pressure Switch(Adjustable)

Temperature Switch

T

PressureSymbol

TemperatureSymbol

LevelSymbol

FlowSymbol

Electrical Symbols (Electrical)

ItemNumber Description Part

NumberSchematicLocation

1 Pump Gp - Steering / Cooling 139-4151 F-42 Motor Gp - Steering 159-7162 F-73 Pump Gp - Implement 9T-8346 D-3

5 Manifold Gp - Inlet & Relief 163-0829 D-56 Valve Gp - Dozer Lift Section 160-5953 D-57 Valve Gp - Tilt Section 160-5954 C-58 Valve Gp - Ripper Lift & Tilt Sections 169-3323 B-510 Cover - End 169-9119 A-511 Valve Gp - Dozer Pilot Control 200-0189 A-312 Valve Gp - Ripper Pilot Control 184-5321 A-814 Valve Gp - Implement Lockout 130-4531 B-815 Accumulator - Pilot Circuit 200-0750 C-816 Valve Gp - Pressure Reg Manifold 162-0162 C-817 Valve Gp - Cooler Bypass 126-0747 E-318 Cooler - Hydraulic Oil 153-1271 D-219 Filter Gp - Steering Charge 177-6979 F-320 Valve Gp - Steering Pilot 9T-8693 E-321 Valve Gp - Pressure Control 163-0057 E-722 Valve Gp - Quick Drop 109-6942 D-223 Cylinder Gp - Lift 6E-1102 D-124 Cylinder Gp - Dual Tilt 6E-0397 C-125 Cylinder Gp - Single Tilt 6E-1175 B-126 Cylinder Gp - Ripper Tip (LH) 155-3652 D-827 Cylinder Gp - Ripper Tip (RH) 165-0102 D-828 Cylinder Gp - Ripper Lift 155-3653 D-729 Cylinder Gp - Pin Puller 6E-3113 D-730 Tank Gp - Hydraulic Oil 164-3700 C-332 Valve Gp - Dual Tilt 106-9648 C-1

Component Locations (Volume 1)

4 Valve Gp - Dozer & Ripper ImpDozer Only

160-5951160-5952 D-5

FWD

Tap LocationsPressure, Sampling, and Sensor

TapNumber Description Schematic

LocationHB Implement Pump Signal Pressure D-4F Charge Pump Discharge Pressure E-7G Case Return E-7H Filter Outlet Pressure F-3

HA Implement Pump Discharge At Pump E-7HC Left Steering Loop F-7HD Right Steering Loop F-7J Hydraulic Oil Cooler Inlet Pressure D-2K Filter Inlet Pressure (SOS) F-3X1 Right Steer Actuator Signal Pressure F-4X2 Left Steer Actuator Signal Pressure F-4Y1 Left Steer Pilot Signal E-3Y2 Right Steer Pilot Signal E-3CP Pilot Oil Supply Pressure B-8

A Implement Pump Discharge Pressure D-4E Charge Pump Relief Pressure E-5

MA Right Steer Loop At Pump F-5MB Left Steer Loop At Pump E-5PS Steer Pump Control Supply E-5

Non Tap Location Points Of Reference

23

23

24

24 25

26

27

28

28

15

29

16

17

22

1 3

32

18

1 1720 19

18

22

3221

21

2

11

20

19 3012 14

7 8

4 5

10

6

330

2

12 14

15 16

7 8

4 5

10

6

HD

HC

2

HA

F

21

G

X2

X1

1

HK

19

Y2 Y1

21 J

18

HB

3

CP

DOZER BLADE

RIPPER

STEERING SYSTEM

IMPLEMENT SYSTEM

RE

NR

36

80

-01

VO

L1

16

Pa

ge

,C

olo

r2

DRAIN / RETURN LINE

LINES GROUP COLOR DESCRIPTIONSSTEER PUMP OUTPUT

TILT CYLINDER CONTROL CIRCUIT

STEERING LOOP CIRCUIT

IMPLEMENT PUMP OUTPUT

RIPPER TIP CYLINDER CONTROL CIRCUIT

SUPPLY LINE

IMPLEMENT PUMP SIGNAL

STEERING PILOT CONTROL CIRCUIT

WINCH CONTROL CIRCUIT

WINCH FREE SPOOL CONTROL CIRCUITLIFT CYLINDER CONTROL CIRCUIT

RIPPER LIFT CYLINDER CONTROL CIRCUIT

12345678

A

C

D

E

F

12345678

A

B

C

D

E

F

B

HD

CP

21

28

284

5

6

1 H

Y1

K

Y2

X2 X1

HA

HB

J

G

F

HC

20

19

17

183

22

23

32 24

25

30

11

16

15

14

12

7

8

8

10

29

26

27

2

MB E

PS

MA

A

RAISE TIP

1 2 3 4

1 2 3 4T S T S

RAISE TILT

1 2 3 4

1 2 3 4T S T S

ELEC. DET.

TILT RIGHT

TILT LEFT

LOWER

RAISE

PILOT DRAINPILOT SUPPLY

SINGLE TILT OPTION

DUAL TILT OPTION

PILOTSUPPLY

MARGIN

CUT-OFF

RIPER TIP

FLOAT PILOT BOOST SIGNAL

TIP/IN

TIP/OUT

RIPER LIFT

RAISE

LOWER

TILT

LIFT

RIPPER LIFT

RIPER TIP

CONTROL PRESSURESUPPLIED BYTRANSMISSION

LINE PATTERNS

Drain / Return Lines

Component Group

Pilot / Load Sensing Pressure

Pressure Line

Attachment

Air Line

CALLOUTS

Taps (Pressure, Sampling,Sensor) by letter

Components by number

YY

52

THIS SCHEMATIC IS FOR THE D8R TRACK-TYPE TRACTORPart #: 163-5975 CHG 06 (RIPPER VERSION) VOLUME 1 OF 2Components are shown installed on a fully operable machine with the key and engineoff and transmission shifter in neutral.

AB

RE

NR

36

80

-01

VO

L2

16

Pa

ge

Volume 2 - with Winch

RENR3680-01August 2005

D8R Track-Type TractorHydraulic SystemAKA1-UP6YZ1-UP

© 2005 CaterpillarAll Rights Reserved

Printed in U.S.A.

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)

2-SECTION PUMP

MAIN AUX.

SPRING(ADJUSTABLE)

VARIABILITY LINE RESTRICTION(VARIABLE)

LINE RESTRICTIONVARIABLE and PRESSURE

COMPENSATED

PRESSURECOMPENSATION

PUMP: VARIABLE andPRESSURE COMPENSATED

ENERGY TRIANGLESHYDRAULIC PNEUMATIC

MEASUREMENT

PRESSURE TEMPERATURE FLOW

ROTATING SHAFTS

UNIDIRECTIONAL BIDIRECTIONAL

PUSH-PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING

MANUAL CONTROL SYMBOLS

HYDRAULIC MOTORS

FIXEDDISPLACEMENT

VARIABLE DISPLACEMENTNON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

HYDRAULIC PUMPS

FLUID STORAGE RESERVOIRS

CROSSING AND JOINING LINES

VALVE ENVELOPES VALVE PORTS

BASIC COMPONENT SYMBOLS

FLUID CONDITIONERPUMP or MOTOR

FLUID POWER SYMBOLS

FIXEDDISPLACEMENT

VARIABLE DISPLACEMENTNON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

VALVES

PILOT CONTROL SYMBOLSRELEASED PRESSURE

EXTERNAL RETURN INTERNAL RETURN

REMOTE SUPPLY PRESSURE

SIMPLIFIED COMPLETE INTERNALSUPPLY PRESSURE

ACCUMULATORS

SPRING LOADED GAS CHARGED

SOLENOIDor MANUAL

SOLENOIDand PILOT

SOLENOID andPILOT or MANUAL

COMBINATION CONTROLS

SOLENOID SERVO THERMAL DETENT

HYDRAULIC AND PNEUMATIC CYLINDERS

DOUBLE ACTINGSINGLE ACTING

BASICSYMBOL

SPRINGLOADED

CHECK VALVES

TWOPOSITION

INFINITEPOSITIONING

FLOW IN ONEDIRECTION

FLOW ALLOWED INEITHER DIRECTION

THREEPOSITION

CROSSFLOW

PARALLELFLOW

INTERNAL PASSAGEWAYS

NORMAL POSITION

A B

P T

A B

P TSHIFTED POSITION INFINITE POSITION

CONTROL VALVES

ATTACHMENT

MANUAL SHUTOFF

SHUTTLE PILOTCONTROLLED

Hydraulic Symbols (Electrical)

Electrical Symbols Table

325-AG135 PK-14

Circuit IdentificationNumber

Wire Color Wire Gauge

Harness identification codeThis example indicateswire 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 NumberIdentification

B A

Wire

Wire

(EXAMPLE VALVE)

Current Standard

Transducer(Fluid)

Transducer(Gas / Air)

G

Generator

Electrical WirePressure Switch

MElectric Motor

Pressure Switch(Adjustable)

Temperature Switch

T

PressureSymbol

TemperatureSymbol

LevelSymbol

FlowSymbol

Electrical Symbols (Electrical)

FWD

ItemNumber Description Part

NumberSchematicLocation

1 Pump Gp - Steering / Cooling 139-4151 F-42 Motor Gp - Steering 159-7162 F-63 Pump Gp - Implement 9T-8346 D-3

5 Manifold Gp - Inlet & Relief 163-0829 D-66 Valve Gp - Dozer Lift Section 160-5953 D-67 Valve Gp - Tilt Section 160-5954 C-69 Valve Gp - Winch Section 124-2906 B-610 Cover - End 169-9119 A-611 Valve Gp - Dozer Pilot Control 200-0189 A-313 Valve Gp - Winch Pilot Control 160-0766 A-814 Valve Gp - Implement Lockout 130-4531 B-815 Accumulator - Pilot Circuit 200-0750 B-816 Valve Gp - Pressure Reg Manifold 162-0162 C-817 Valve Gp - Cooler Bypass 126-0747 E-318 Cooler - Hydraulic Oil 153-1271 D-219 Filter Gp - Steering Charge 177-6979 F-320 Valve Gp - Steering Pilot 9T-8693 F-321 Valve Gp - Pressure Control 163-0057 E-622 Valve Gp - Quick Drop 109-6942 D-223 Cylinder Gp - Lift 6E-1102 D-124 Cylinder Gp - Dual Tilt 6E-0397 C-125 Cylinder Gp - Single Tilt 6E-1175 B-130 Tank Gp - Hydraulic Oil 164-3700 C-331 Winch Unit 160-5555 E-832 Valve Gp - Dual Tilt 106-9648 C-1

4 Valve Gp - Dozer & Winch ImpDozer Only

160-8612160-5952 D-6

Component Locations (Volume 2)

Tap LocationsPressure, Sampling, and Sensor

TapNumber Description Schematic

LocationHB Implement Pump Signal Pressure D-4F Charge Pump Discharge Pressure E-6G Case Return E-6H Filter Outlet Pressure F-3

HA Implement Pump Discharge At Pump E-6HC Left Steering Loop E-6HD Right Steering Loop F-6J Hydraulic Oil Cooler Inlet Pressure D-2K Filter Inlet Pressure (SOS) F-3X1 Right Steer Actuator Signal Pressure F-4X2 Left Steer Actuator Signal Pressure F-4Y1 Left Steer Pilot Signal E-3Y2 Right Steer Pilot Signal E-3CP Pilot Oil Supply Pressure B-8

A Implement Pump Discharge Pressure D-4E Charge Pump Relief Pressure E-5

MA Right Steer Loop At Pump F-5MB Left Steer Loop At Pump E-5PS Steer Pump Control Supply E-5

Non Tap Location Points Of Reference

15 16

17

22

1 3

32

18

1 1720 19

18

22

3221

21

2

11

20

19 3013 14

7 9

4 5

10

6

330

2

13 14

15 16

7 9

4 5

10

6

23

23

24

24 25

31 HD

HC

2

HA

F

21

G

X2

X1

1

HK

19

Y2 Y1

21 J

18

HB

3

CP

STEERING SYSTEM

IMPLEMENT SYSTEM

DOZER BLADE

WINCH

RE

NR

36

80

-01

VO

L2

16

Pa

ge

,C

olo

r2

DRAIN / RETURN LINE

LINES GROUP COLOR DESCRIPTIONSSTEER PUMP OUTPUT

TILT CYLINDER CONTROL CIRCUIT

STEERING LOOP CIRCUIT

IMPLEMENT PUMP OUTPUT

RIPPER TIP CYLINDER CONTROL CIRCUIT

SUPPLY LINE

IMPLEMENT PUMP SIGNAL

STEERING PILOT CONTROL CIRCUIT

WINCH CONTROL CIRCUIT

WINCH FREE SPOOL CONTROL CIRCUITLIFT CYLINDER CONTROL CIRCUIT

RIPPER LIFT CYLINDER CONTROL CIRCUIT

12345678

A

C

D

E

F

12345678

A

B

C

D

E

F

B

TILT RIGHT

TILT LEFT

LOWER

RAISE

PILOT DRAIN

PILOT SUPPLY

HD

21

31

4

5

6

CP

A

MB E PS

MAH

Y1

K

Y2

X2 X1

20

19

17

1

HA

G

FHC

2

HB

3

J18

22

23

32 2430

25

11

7

10

9

16

15

14

13

THIS SCHEMATIC IS FOR THE D8R TRACK-TYPE TRACTORPart #: 163-5975 CHG 06 (WINCH VERSION) VOLUME 2 OF 2Components are shown installed on a fully operable machine with the key and engineoff and transmission shifter in neutral.

LINE PATTERNS

Drain / Return Lines

Component Group

Pilot / Load Sensing Pressure

Pressure Line

Attachment

Air Line

CALLOUTS

Taps (Pressure, Sampling,Sensor) by letter

Components by number

YY

52

SINGLE TILT OPTION

DUAL TILT OPTION

PILOTSUPPLY

MARGIN

CUT-OFF

FLOAT PILOT BOOST SIGNAL

WINCH

TILT

LIFT

RAISE TILT

1 2 3 4

1 2 3 4T S T S

ELEC. DET.

AB

FREE SPOOL HAUL IN/PAY OUT

1 2 3 4

1 2 3 4T S T S

ELEC. DET.

G

X