ItemPart

NumberDescription

Schematic

Location

1C 183-4584 SPEED SENSOR (STEERING MOTOR) B-8

2C 164-7577 CHARGE FILTER BYPASS SWITCH C-6

3C 237-0957 FAN PUMP PRES TRANSDUCER B-4

4C 237-0957 IMPLEMENT PUMP PRESS TRANSDUCER D-3

5C 224-4535 CHARGE PRESS TRANSDUCER C-7

6C 145-7028 TEMPERATURE SENSOR C-2

Component Locations

ItemPart

NumberDescription

Schematic

Location

1 214-1093 STEERING PUMP A-5

2 214-1094 STEERING MOTOR B-7

3 212-2297 CHARGE FILTER C-7

4 212-0675 COLD OIL RELIEF VALVE A-6

5 214-1097 FAN PUMP B-4

6 214-1098 IMPLEMENT PUMP B-3

7 214-1099 FAN MOTOR B-5

8 124-8335 COOLER BYPASS A-5

9 206-7353 COOLER A-4

10 208-1558 SUCTION MANIFOLD B-3

11 223-8531 PRESSURE REDUCING VALVE E-4

12 200-0750 ACCUMULATORS D-4

13 201-0950 SHUT-OFF VALVE-PILOT E-4

214-1079IMPLEMENT VALVE

(BULLDOZER/RIPPER)

211-7817IMPLEMENT VALVE

(BULLDOZER/WINCH)

15 208-9683 END COVER D-7

16 217-4327 QUICK DROP VALVE E-5

165-8633 LIFT CYLINDER

225-6727 LIFT CYLINDER

18 109-6778 SINGLE TILT CYLINDER (RH) E-6

19 133-8269 CASE DRAIN MANIFOLD B-1

20 123-8098 R IPPER LIFT CYLINDER E-7, F-7

21 123-8097 RIPPER TIP CYLINDER E-7, F-7

22 6E-3113 PIN PULLER CYLINDER E-8

23 188-6140 PIN PULLER VALVE E-8

24 222-0491 TANK GP B-2

25 154-6165 VACUUM BREAKER C-2

26 126-1813 PILOT FILTER D-4

27 4E-1437 CHECK VALVE (FAN CIRCUIT) B-4

28 N/A PILOT MANIFOLD D-13

1A 217-4326 DUAL TILT VALVE F-6

2A 109-8832 DUAL TILT CYLINDER (RH) E-6

3A 109-8833 DUAL TILT CYLINDER (LH) F-6

1B 214-1100 REVERSING FAN MOTOR (OPTION) B-5

2B 229-1466 VALVE GP C-5

N/A: Part number unavalible at the time of publication.

Component Locations

DUAL TILT OPTION

REVERSING FAN OPTION

17

14 C-5

E-5

RENR7534-01

24Page,DGM

RENR7534-01

January 2005

D9T Track-Type Tractor

Hydraulic System

RJS1-UP

2005 Caterpillar

All Rights Reserved

Printed in U.S.A.

1

3

4 5

The steering charge filter (1) is a canister-type filter

with a replaceable element. It is located under the

triangular deck plate just outside the left operator

compartment door. Steering charge pump discharge

pressure can be checked using the pressure test

port (F) that is installed in the top of the filter housing

cover. The steering charge pump discharge pressure

sensor (3) is installed on top of the housing, at the

filter inlet (4). Not visible above is the steering charge

filter bypass switch (pressure differential switch). It is

installed in the housing between the filter inlet port (4)

and the filter outlet port (5). (The filter inlet hose in

the illustration above is in front of the switch from this

angle.)

The hydraulic oil cooler (1) is an oil-to-air coolerand is mounted horizontally behind the radiatorand ATAAC cores. The hydraulic oil SOS tapis located toward the top of the vertical tube onthe left side of the cooler, and is easily accessiblefrom the left side engine compartment opening.

The thermal bypass valve (3) for the hydraulic oilcooler is an internal valve, located at the left sideof the cooler. It is also accessed from the left sideengine compartment. Also shown above is thecooler inlet (4) and the cooler outlet (5).

HPDL HPTL HPRR HPSO

HPS

HA

AP

PILOT MANFOLD DUAL TILT / QUICK DROP VALVEHYDRAULIC OIL COOLERCHARGE FILTER

FAN DRIVE MOTOR

FAN PUMP

PIN PULLER / CYLINDER

IMPLEMENT VALVE STEERING PUMP

SOS

F

HD

HC

X1

X2

HFPD

Pin Puller Valve

Pin Puller Cylinder

Pin

D9T

22 21 AP

1C20

23

14

10

19 25 246C

2

15 13HB 12

26 28 4C

611 5 4

3 2C 16

17

HPS HA AP HFPD

3C

1B7

1A

5C

8 9

2B 3A 18

X2F

HD

S

HC

X1

2A

HPSO HPSI HPRR HPRL

HPTL HPTR HPDL HPDR

1

27

3

If the machine is equipped with dual tilt, the dual tilt valve (1) isinstalled at the left front of the radiator guard, behind the left grilldoor. The dual tilt solenoid (2) is located at the bottom of thedual tilt valve.

The quick-drop valve (3) is located on top, center of theradiator guard. The quick-drop valve for the D9T issolenoid operated.

4

5

6

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

PRESSURE

COMPENSATION

PUMP: VARIABLE and

PRESSURE COMPENSATED

ENERGY TRIANGLES

HYDRAULIC PNEUMATIC

MEASUREMENT

PRESSURE TEMPERATURE FLOW

ROTATING SHAFTS

UNIDIRECTIONAL BIDIRECTIONAL

PUSH-PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING

MANUAL CONTROL SYMBOLS

HYDRAULIC MOTORS

FIXED

DISPLACEMENT

VARIABLE DISPLACEMENT

NON-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

FIXED

DISPLACEMENT

VARIABLE DISPLACEMENT

NON-COMPENSATED

UNIDIRECTIONAL

BIDIRECTIONAL

VALVES

PILOT CONTROL SYMBOLSRELEASED PRESSURE

EXTERNAL RETURN INTERNAL RETURN

REMOTE SUPPLY PRESSURE

SIMPLIFIED COMPLETE INTERNAL

SUPPLY PRESSURE

ACCUMULATORS

SPRING LOADED GAS CHARGED

SOLENOID

or MANUALSOLENOID

and PILOT

SOLENOID and

PILOT or MANUAL

COMBINATION CONTROLS

SOLENOID SERVO THERMAL DETENT

HYDRAULIC AND PNEUMATIC CYLINDERS

DOUBLE ACTINGSINGLE ACTING

BASIC

SYMBOL

SPRING

LOADED

CHECK VALVES

TWO

POSITION

INFINITE

POSITIONING

FLOW IN ONE

DIRECTION

FLOW ALLOWED IN

EITHER DIRECTION

THREE

POSITION

CROSS

FLOWPARALLEL

FLOW

INTERNAL PASSAGEWAYS

NORMAL POSITION

A B

P T

A B

P T

SHIFTED POSITION INFINITE POSITION

CONTROL VALVES

ATTACHMENT

MANUAL SHUTOFF

SHUTTLE PILOT

CONTROLLED

Hydraulic Symbols (Electrical)

Electrical Symbols Table

325-AG135 PK-14

Circuit IdentificationNumber

Wire Color Wire Gauge

Harness identification code

This example indicates

wire 135 in harness "AG".

325-PK-14

Wire Gauge

Wire Color

Circuit Number

Identification

Wire Number Identification Codes

Current Standard

Previous Standard

Electrical Schematic Example Hydraulic Schematic Example

325-PK

Wire ColorCircuit Number

Identification

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)

RipperRaise

RipperTip

Inlet Manifold

Solenoids

End Cover

3

4

5

6

1

2

1. pilot relief valve2. pressure reducing valve3. implement pump discharge pressure sensor

1

2

3

The steering pump is mounted to the upper left, rear of the flywheel housing.Components identified in the two illustrations are:

1

2

1

3

4

5

Opening the grill on the front of the radiator guard gains access to

the fan (4) and the hydraulic fan motor (5). If the machine is equipped

with dual tilt, the dual tilt valve (6) is also located here. middle

of the radiator guard.

1

2

3

5

4

The hydraulic demand fan pump is mounted to the rear of the

implement pump at the upper right of of the flywheel housing.

The fan drive pump is a variable displacement axial piston

pump.The pump provides the oil flow that is needed to operate

the hydraulic fan motor. Service points for the demand fan

pump that are shown above are:

1. Hydraulic demand fan pump

2. Fan pump pressure sensor

3. Fan pump pressure control solenoid

4. Adjustment screw for the pump control spool

5. Adjustment screw for the pressure control spool

"HFPD". Hydraulic Fan Pump Discharge pressure test port

1

2

3

45

6

78

At the left side of the valve stack is the inlet manifold (1). The inlet manifold contains the charging valve (2) andthe main relief valve (3). Implement signal pressure (HB) can be tested at the pressure test port (4) that isinstalled on the pump signal line, below the inlet manifold.

The case drain lines from the steering pump, the steering motor, the implement pump, the fan pump, the dual tiltand quick drop valve all come together in the case drain manifold (5). The case drain oil is then returned to thecase drain filter, which is contained in the hydraulic tank. Each implement control valve contains a solenoidcontrolled pilot valve (6) at either end of the control valve. (The solenoid controlled pilot valves located at thebottom of each control valve are not visible in the illustration above.)

Each implement control valve also contains a pilot pressure test port (7) for testing pilot pressure at the end ofthe valve. The other end of each implement control valve also contains a corresponding pressure test port (not -visible above).

The float pilot boost line (8) directs pilot oil from the LOWER/FLOAT end of the dozer lift control valve to the last(external) resolver in the signal resolver network. Pilot oil is used to signal the implement pump to upstroke whenthe FLOAT function is requested by the operator.

4. pilot filter bypass check valve5. implement lockout solenoid valve6. accumulator check valve

Tap

NumberDescription

Schematic

Location

AP ACCUMULATOR PRESSURE E-6

HA IMP-PUMP-DISCHARGE D-3

HB IMP-PUMP-SIGNAL C-4

HC LEFT STEER LOOP PRESSURE B-6

HD RIGHT STEER LOOP PRESSURE B-6

F CHARGE PUMP PRESSURE C-6

S OIL SAMPLING PORT C-7

HFPD FAN PUMP DISCHARGE B-4

HPS PILOT SUPPLY E-4

X1 STEER PUMP CONTROL PRESSURE (R) B-5

X2 STEER PUMP CONTROL PRESSURE (L) B-5

HPSO HYD PILOT RIPPER TIP-OUT D-7

HPSI HYD PILOT RIPPER TIP-IN D-7

HPRR HYD PILOT RIPPER RAISE D-6

HPRL HYD PILOT RIPPER LOWER D-6

HPTL HYD PILOT TILT LEFT D-6

HPTR HYD PILOT TILT RIGHT D-6

HPDL HYD PILOT DOER LOWER D-5

HPDR HYD PILOT DOZER RAISE D-5

Tap Locations

Pressure, Sampling, and Sensor

HPDR HPRL HPSIHPTR

Solenoids

BladeLift

BladeTilt

1. Left steer pump control solenoid

2. Right steer pump control solenoid

3. Steering charge pump

"HC". left steering loop pressure test port.

"HD". right steering loop pressure test port.

"X1". pressure test port (steer right)

"X2". pressure test port (steer left)

MACHINE VIEWCOMPONENT AND TAP LOCATIONS

THIS SCHEMATIC IS FOR THE D9T TRACK-TYPE TRACTOR

Part #: 207-4792 CHG02

Components are shown installed on a fully operable machine with the key and engine

off and transmission shifter in neutral.

RENR7534-01

24Page,Color2,DGM

DRAIN / RETURN LINE

LINES GROUP COLOR DESCRIPTIONS

MAIN PUMP OUTPUT

STEERING PUMP OUTPUT

LIFT and TIP CYLINDER (RIPPER)

PILOT OIL

LOAD SENSING

LIFT CYLINDER (BLADE)

SUPPLY LINE

PIN PULLER

CYLINDER SINGLE TILT / DUAL TILT (OPTION) (BLADE)

VALVE GROUP (REVERSING FAN OPTION)

FAN MOTOR

T P

C1C2

12345678

A

C

D

E

F

12345678

A

B

C

D

E

F

B

TILT CYL LINES

SINGLE TILT CYL LINES

DUAL TILT CYL LINES

(SERIES 31)(SERIES 31)

C2T

C1

P

SCREEN

R

2

TRANSP

T

22

18

16

17

24

25

3A

2A

20

20

21

11

15

14

1A

23

3

7

9

5

8

12

11

6

4

2C

3C

6C

1

26

HC

13

2B

4C

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

X2 X1

HFPD

F

HPS

HB

AP

HA

HD

27

S

5C

1C

1B

HPDLHPTLHPRRHPSO

HPSI HPRL HPTRHPDR

28

19

RIPPER TIP RIPPER RAISE BLADE TILT BLADE LIFT INLET MANIFOLD