RENR7534-01 FLUID POWER SYMBOLS

7 January 2005 BASIC COMPONENT SYMBOLS

8
1 X2
1 SPRING CONTROL VALVES LINE RESTRICTION
MAIN AUX.
PUMP: VARIABLE and
PUMP or MOTOR FLUID CONDITIONER RESTRICTION 2-SECTION PUMP PRESSURE COMPENSATED
(FIXED)

6 VARIABILITY SPRING LINE RESTRICTION PRESSURE HYDRAULIC PNEUMATIC LINE RESTRICTION ATTACHMENT
(ADJUSTABLE) (VARIABLE) COMPENSATION ENERGY TRIANGLES VARIABLE and PRESSURE
COMPENSATED

VALVES
2 VALVE ENVELOPES VALVE PORTS

ONE POSITION TWO POSITION THREE POSITION TWO-WAY THREE-WAY FOUR-WAY

3 CONTROL VALVES CHECK VALVES

AB AB

P T P T
BASIC SPRING SHUTTLE PILOT
NORMAL POSITION SHIFTED POSITION INFINITE POSITION
5 X1 SYMBOL LOADED CONTROLLED
4
2 MEASUREMENT ROTATING SHAFTS

The steering pump is mounted to the upper left, rear of the flywheel housing.
PRESSURE TEMPERATURE FLOW UNIDIRECTIONAL BIDIRECTIONAL
Components identified in the two illustrations are:
At the left side of the valve stack is the inlet manifold (1). The inlet manifold contains the charging valve (2) and
the main relief valve (3). Implement signal pressure (HB) can be tested at the pressure test port (4) that is FLUID STORAGE RESERVOIRS
installed 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 tilt
1. Left steer pump control solenoid D9T Track-Type Tractor
and quick drop valve all come together in the case drain manifold (5). The case drain oil is then returned to the 2. Right steer pump control solenoid VENTED PRESSURIZED RETURN ABOVE FLUID LEVEL RETURN BELOW FLUID LEVEL
case drain filter, which is contained in the hydraulic tank. Each implement control valve contains a solenoid
controlled pilot valve (6) at either end of the control valve. (The solenoid controlled pilot valves located at the
bottom of each control valve are not visible in the illustration above.)
3. Steering charge pump Hydraulic System COMBINATION CONTROLS
"HC". left steering loop pressure test port.
Each implement control valve also contains a pilot pressure test port (7) for testing pilot pressure at the end of "HD". right steering loop pressure test port. RJS1-UP
the valve. The other end of each implement control valve also contains a corresponding pressure test port (not - SOLENOID SOLENOID SOLENOID SOLENOID and SERVO THERMAL DETENT
visible above). "X1". pressure test port (steer right) or MANUAL and PILOT PILOT or MANUAL

The float pilot boost line (8) directs pilot oil from the LOWER/FLOAT end of the dozer lift control valve to the last "X2". pressure test port (steer left) MANUAL CONTROL SYMBOLS
(external) resolver in the signal resolver network. Pilot oil is used to signal the implement pump to upstroke when
the FLOAT function is requested by the operator.

PUSH-PULL LEVER MANUAL SHUTOFF GENERAL MANUAL PUSH BUTTON PEDAL SPRING
HC
HPDL HPTL HPRR HPSO
PILOT CONTROL SYMBOLS
RELEASED PRESSURE REMOTE SUPPLY PRESSURE
HD
Solenoids

EXTERNAL RETURN INTERNAL RETURN SIMPLIFIED COMPLETE INTERNAL

SUPPLY PRESSURE
Inlet Manifold
ACCUMULATORS CROSSING AND JOINING LINES HYDRAULIC AND PNEUMATIC CYLINDERS

SPRING LOADED GAS CHARGED LINES CROSSING LINES JOINING SINGLE ACTING DOUBLE ACTING
Blade Blade Ripper Ripper
Lift Tilt Raise Tip
HYDRAULIC PUMPS HYDRAULIC MOTORS INTERNAL PASSAGEWAYS
End Cover
FIXED VARIABLE DISPLACEMENT FIXED VARIABLE DISPLACEMENT THREE TWO
INFINITE
DISPLACEMENT NON-COMPENSATED DISPLACEMENT NON-COMPENSATED POSITIONING POSITION POSITION

3 UNIDIRECTIONAL UNIDIRECTIONAL

FLOW IN ONE PARALLEL CROSS FLOW ALLOWED IN

BIDIRECTIONAL BIDIRECTIONAL DIRECTION FLOW FLOW EITHER DIRECTION

Solenoids

HPDR HPTR HPRL HPSI

2005 Caterpillar Printed in U.S.A.
All Rights Reserved

IMPLEMENT VALVE STEERING PUMP

Electrical Symbols Table

Component Locations Tap Locations
Pin Puller Valve
Part Schematic Pressure, Sampling, and Sensor
Item
Number
Description
Location
Hydraulic Symbols (Electrical)
Tap Schematic
1 214-1093 STEERING PUMP A-5 Description
Number Location
2 214-1094 STEERING MOTOR B-7 AP ACCUMULATOR PRESSURE E-6
3 212-2297 CHARGE FILTER C-7

Pin Puller Cylinder

4 212-0675 COLD OIL RELIEF VALVE A-6
HA
HB
IMP-PUMP-DISCHARGE
IMP-PUMP-SIGNAL
D-3
C-4
G M
5 214-1097 FAN PUMP B-4 HC LEFT STEER LOOP PRESSURE B-6
6 214-1098 IMPLEMENT PUMP B-3 HD RIGHT STEER LOOP PRESSURE B-6
7 214-1099 FAN MOTOR B-5
Transducer Transducer Generator Electric Motor
F CHARGE PUMP PRESSURE C-6 (Fluid) (Gas / Air)
8 124-8335 COOLER BYPASS A-5 S OIL SAMPLING PORT C-7
9 206-7353 COOLER A-4 HFPD FAN PUMP DISCHARGE B-4
10 208-1558 SUCTION MANIFOLD B-3 HPS PILOT SUPPLY E-4
Pin 11 223-8531 PRESSURE REDUCING VALVE E-4 X1 STEER PUMP CONTROL PRESSURE (R) B-5
12 200-0750 ACCUMULATORS D-4 X2 STEER PUMP CONTROL PRESSURE (L) B-5
13 201-0950 SHUT-OFF VALVE-PILOT E-4 HPSO HYD PILOT RIPPER TIP-OUT D-7

RENR7534-01
214-1079
IMPLEMENT VALVE HPSI HYD PILOT RIPPER TIP-IN D-7 5C F X1 X2 S Pressure Switch Temperature Switch Electrical Wire
14
(BULLDOZER/RIPPER)
C-5 HPRR HYD PILOT RIPPER RAISE D-6 Pressure Switch
PIN PULLER / CYLINDER 211-7817
IMPLEMENT VALVE HPRL HYD PILOT RIPPER LOWER D-6
22 21 23 19 6C 25 24 1 3 2C AP HC HD 16 8 9
(Adjustable)
(BULLDOZER/WINCH)
HPTL HYD PILOT TILT LEFT D-6
15 208-9683 END COVER D-7
HPTR HYD PILOT TILT RIGHT D-6
16 217-4327 QUICK DROP VALVE E-5
The hydraulic demand fan pump is mounted to the rear of the HPDL HYD PILOT DOER LOWER D-5
165-8633 LIFT CYLINDER
Electrical Symbols (Electrical)

24 Page, DGM
implement pump at the upper right of of the flywheel housing.
HFPD 1 The fan drive pump is a variable displacement axial piston
17
225-6727 LIFT CYLINDER
E-5 HPDR HYD PILOT DOZER RAISE D-5

pump.The pump provides the oil flow that is needed to operate 18 109-6778 SINGLE TILT CYLINDER (RH) E-6
the hydraulic fan motor. Service points for the demand fan
19 133-8269 CASE DRAIN MANIFOLD B-1
pump that are shown above are:
2 5 20 123-8098 R IPPER LIFT CYLINDER E-7, F-7 17
T
21 123-8097 RIPPER TIP CYLINDER E-7, F-7
22 6E-3113 PIN PULLER CYLINDER E-8 Pressure Temperature Level Flow
1. Hydraulic demand fan pump 23 188-6140 PIN PULLER VALVE E-8 Symbol Symbol Symbol Symbol
2. Fan pump pressure sensor 7 1B
24 222-0491 TANK GP B-2
3. Fan pump pressure control solenoid
4. Adjustment screw for the pump control spool 25 154-6165 VACUUM BREAKER C-2
5. Adjustment screw for the pressure control spool
"HFPD". Hydraulic Fan Pump Discharge pressure test port
26
27
126-1813
4E-1437
PILOT FILTER
CHECK VALVE (FAN CIRCUIT)
D-4
B-4
D9T 1A Wire Number Identification Codes
3 4 28 N/A PILOT MANIFOLD D-13
DUAL TILT OPTION Electrical Schematic Example Hydraulic Schematic Example
27
1A 217-4326 DUAL TILT VALVE F-6
FAN PUMP 2A 109-8832 DUAL TILT CYLINDER (RH) E-6 Current Standard Current Standard
3A 109-8833 DUAL TILT CYLINDER (LH) F-6
Harness identification code
REVERSING FAN OPTION This example indicates
1B 214-1100 REVERSING FAN MOTOR (OPTION) B-5 wire 135 in harness "AG". Wire
Circuit Number Wire Color
Opening the grill on the front of the radiator guard gains access to 2B 229-1466 VALVE GP C-5
Identification
the fan (4) and the hydraulic fan motor (5). If the machine is equipped N/A: Part number unavalible at the time of publication.
with dual tilt, the dual tilt valve (6) is also located here. middle 325-AG135 PK-14
of the radiator guard.
4 325-PK
Circuit Identification Wire Color Wire Gauge
Number

Previous Standard
Component Locations
5 Part Schematic 20 HB 15 14 11 12 13 1C 6 5 4 2B 2A 3A 18 Wire
Wire Color
Item Description
6 Number Location
1C 183-4584 SPEED SENSOR (STEERING MOTOR) B-8
HPSO HPSI HPRR HPRL 26 28 4C 2 10 3C 325-PK-14
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 HPTL HPTR HPDL HPDR HPS HA AP HFPD B A
5C 224-4535 CHARGE PRESS TRANSDUCER C-7 Circuit Number Wire Gauge
6C 145-7028 TEMPERATURE SENSOR C-2 Identification (EXAMPLE VALVE)

FAN DRIVE MOTOR MACHINE VIEW

COMPONENT AND TAP LOCATIONS

The hydraulic oil cooler (1) is an oil-to-air cooler

The steering charge filter (1) is a canister-type filter and is mounted horizontally behind the radiator 1 6 3
1 5 with a replaceable element. It is located under the and ATAAC cores. The hydraulic oil SOS tap SOS
is located toward the top of the vertical tube on 1
triangular deck plate just outside the left operator
the left side of the cooler, and is easily accessible 5
compartment door. Steering charge pump discharge from the left side engine compartment opening. AP
pressure can be checked using the pressure test
port (F) that is installed in the top of the filter housing The thermal bypass valve (3) for the hydraulic oil
cover. The steering charge pump discharge pressure cooler is an internal valve, located at the left side 4
F 4 of the cooler. It is also accessed from the left side
sensor (3) is installed on top of the housing, at the 3 2
filter inlet (4). Not visible above is the steering charge engine compartment. Also shown above is the
cooler inlet (4) and the cooler outlet (5). 1
filter bypass switch (pressure differential switch). It is 3
3 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
HPS
angle.)
HA
2

4 5 1. pilot relief valve 4. pilot filter bypass check valve If the machine is equipped with dual tilt, the dual tilt valve (1) is The quick-drop valve (3) is located on top, center of the
2. pressure reducing valve 5. implement lockout solenoid valve
3. implement pump discharge pressure sensor installed at the left front of the radiator guard, behind the left grill radiator guard. The quick-drop valve for the D9T is
6. accumulator check valve door. The dual tilt solenoid (2) is located at the bottom of the solenoid operated.
dual tilt valve.

CHARGE FILTER HYDRAULIC OIL COOLER PILOT MANFOLD DUAL TILT / QUICK DROP VALVE
 8 7 6 5 4 3 2 1

LINES GROUP COLOR DESCRIPTIONS

MAIN PUMP OUTPUT
PILOT OIL
STEERING PUMP OUTPUT
LIFT CYLINDER (BLADE)
SUPPLY LINE

F 20 3A
DRAIN / RETURN LINE
LIFT and TIP CYLINDER (RIPPER)
F
LOAD SENSING
CYLINDER SINGLE TILT / DUAL TILT (OPTION) (BLADE)
VALVE GROUP (REVERSING FAN OPTION)
FAN MOTOR
PIN PULLER

1A
LINE PATTERNS
Pressure Line

Pilot / Load Sensing Pressure

21 Drain / Return Lines

Component Group

16 Attachment
2A Air Line
T
CALLOUTS
TRANS
P YY Taps (Pressure, Sampling,Sensor) by letter

Components by number
E 18 52

20
23 17 13 28
SINGLE TILT CYL LINES AP
DUAL TILT CYL LINES
HPS
TILT CYL LINES

12
22
HPDR 26
HPSI HPRL HPTR
HA

D D
4C
11

HPSO HPRR HPTL HPDL

RIPPER TIP RIPPER RAISE BLADE TILT BLADE LIFT INLET MANIFOLD 14
HB

C2 C1
C 15 C
RENR7534-01

2C
25
24 Page, Color 2, DGM

3
5C 2B
F

6C
5 6

HD (SERIES 31) (SERIES 31)

R

1C 3C
T P
SCREEN
B B

P
C1

27 HFPD 24

1B 7
HC 19
1 C2
T
4 X2 X1
8 11
S

A A
9

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.

8 7 6 5 4 3 2 1