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15 12

18

6

20

25

19

3

14

5

9

8

10

KENR7618-03 January 2011

11

HH

FLUID POWER SYMBOLS

GG

BASIC COMPONENT SYMBOLS MAIN

PUMP OR MOTOR

FLUID CONDITIONER

SPRING

CONTROL VALVES

VARIABILITY

SPRING (ADJUSTABLE)

LINE RESTRICTION (VARIABLE)

PRESSURE COMPENSATION

LINE RESTRICTION (FIXED)

HYDRAULIC PNEUMATIC ENERGY TRIANGLES

TWO POSITION

PUMP (VARIABLE & PRESSURE COMPENSATED)

LINE RESTRICTION (VARIABLE & PRESSURE COMPENSATED)

ATTACHMENT

VALVE PORTS

THREE POSITION

TWO - WAY

THREE - WAY

CONTROL VALVES AB

PUMP (2 - SECTION)

VALVES

VALVE ENVELOPES

ONE POSITION

RESTRICTION

AUX

FOUR - WAY

CHECK VALVES

A B

P T

P T

NORMAL POSITION

SHIFTED POSITION

BASIC SYMBOL

INFINITE POSITION

SPRING LOADED

SHUTTLE

PILOT CONTROLLED

FLUID STORAGE RESERVOIRS

PRESSURIZED

VENTED

924H and 924HZ Wheel Loader Hydraulic System 16

7 17 21

15

6

12

1

1

2

2

24

20

4 26 23

26 19

4

22 13

8

9

14 24

5

8

RETURN BELOW FLUID LEVEL

MEASUREMENT

PRESSURE

ROTATING SHAFTS

TEMPERATURE

FLOW

UNIDIRECTIONAL

BIDIRECTIONAL

COMBINATION CONTROLS

RCB1-UP WLB1-UP HXC1-UP PED1-UP JTM1-UP KLN1-UP JZZ1-UP

10 11

RETURN ABOVE FLUID LEVEL

SOLENOID

SOLENOID OR MANUAL

SOLENOID & PILOT

SOLENOID & PILOT OR MANUAL

SERVO

THERMAL

DETENT

MANUAL CONTROL SYMBOLS

PUSH - PULL LEVER

GENERAL MANUAL

MANUAL SHUTOFF

PUSH BUTTON

PEDAL

PILOT CONTROL SYMBOLS

RELEASED PRESSURE

SPRING

REMOTE SUPPLY PRESSURE

14 EXTERNAL RETURN

INTERNAL RETURN

SIMPLIFIED

COMPLETE

CROSSING & JOINING LINES

ACCUMULATORS

INTERNAL SUPPLY PRESSURE

HYDRAULIC & PNEUMATIC CYLINDERS

TILT CONTROL SPRING LOADED

GAS CHARGED

LINES CROSSING

HYDRAULIC MOTORS

HYDRAULIC PUMPS FIXED DISPLACEMENT

© 2011 Caterpillar, All Rights Reserved

SINGLE ACTING

LINES JOINING

FIXED DISPLACEMENT

VARIABLE DISPLACEMENT NON-COMPENSATED

INTERNAL PASSAGEWAYS

VARIABLE DISPLACEMENT NON-COMPENSATED

UNIDIRECTIONAL

UNIDIRECTIONAL

BIDIRECTIONAL

BIDIRECTIONAL

DOUBLE ACTING

INFINITE POSITIONING

3 POSITION

FLOW IN ONE DIRECTION

PARALLEL FLOW

CROSS FLOW

2 POSITION

FLOW IN EITHER DIRECTION

Printed in U.S.A.

ELECTRICAL SYMBOLS TABLE HYDRAULIC SYMBOLS (ELECTRICAL)

18

21

3

25

23

13 22

9

M

TRANSDUCER (FLUID)

TRANSDUCER (GAS / AIR)

GENERATOR

ELECTRIC MOTOR

PRESSURE SWITCH

PRESSURE SWITCH (ADJUSTABLE)

TEMPERATURE SWITCH

ELECTRICAL WIRE

COMPONENT LOCATIONS ELECTRICAL SYMBOLS (ELECTRICAL)

Component Locations NAME

PART NO. 924H

PART NO. 924HZ

Machine Location

Schematic Location

PART NO. 924H

NAME

Accumulator Gp - Brake

140-9251

140-9251

1

C-8, D-8

Accumulator Gp - Pilot

243-4398

243-4398

2

B-6

Switch As - Ride Contr Disable

Switch As - Float Press. 126-6916

Accumulator Gp - Ride Control

283-4418

283-4418

3

E-5

Switch As - Sec. Steering

230-5771

PART NO. 924HZ

Machine Location

229-1537 230-5771

Schematic Location

23

B-5

23

B-5

14

C-7

T

PRESSURE SWITCH

TEMPERATURE SWITCH

LEVEL SWITCH

FLOW SWITCH

Accumulator Gp - Ride Control

298-2412

298-2412

3

E-5

Tank Gp- Hydraulic Oil

262-5654

262-5654

20

A-7

Connector - Orifice

8C-0564

8C-0564

4

A-3 to A-5

Valve As - Foot Brake

144-8521

144-8521

22

D-8

Connector - Orifice

3E-2335

3E-2335

5

D-4

Valve Gp - Ball, Dead Eng. Lwr

112-1817

112-1817

5

D-4

Cooler - Hydraulic Oil Cooler

293-2240

293-2240

6

B-8

Valve Gp - Check

9T-1013

9T-1013

13

E-8

Cooler As - Dual Disc Brakes

205-3652

205-3652

7

B-8

Valve Gp - Check, Cooler Bypass

145-8983

145-8983

6

D-6

ELECTRICAL SCHEMATIC EXAMPLE

HYDRAULIC SCHEMATIC EXAMPLE

Cylinder Gp - Lift

141-7483

152-4187

8

D-4

Valve Gp - Check, Clr Bypass, W/ Axle Oil Clr

145-8983

145-8983

6

D-6

CURRENT STANDARD

CURRENT STANDARD

212-7521

Cylinder Gp - Steering

142-6251

142-6251

9

F-8

Valve Gp - Check, Back Press.

212-7521

14

D-6

Cylinder Gp - Tilt

268-9437

152-5306

10

D-4

Valve Gp - Combination, Rlf/ Dvtr

173-4032

14

D-5

Cylinder Gp - Coupler, Standard

190-3085

11

F-7

Valve Gp - Coupler Control

233-2549

14

F-7

23

B-3 to B-5

23

B-3 to B-5

Cylinder Gp - Coupler, Wide

188-0982

Filter Gp

209-3149

11

F-7

Valve Gp - Implement 2 Section

209-3149

12

A-8

Valve Gp - Implmnt 2 Sec. W/ Regen

209-0273 209-0270

Hand Metering Unit

214-4153

214-4153

13

F-8

Valve Gp - Implement 3 Section

23

B-3 to B-5

Manifold

209-0789

209-0789

14

C-7

Valve Gp - Implmnt 3 Sec. W/ Regen

209-0271

209-0274

23

B-3 to B-5

Motor Gp - Axle Oil Cooler

288-4166

288-4166

15

B-8

Valve Gp - Implmnt 4 Sec. W/ Regen

209-0272

23

B-3 to B-5

Motor Gp - Radiator Hydr. Fan

289-6393

289-6393

16

A-8

Valve Gp - Intgrtd 3rd Fnct. Cntrl

262-9706

23

E-2

Motor Gp - Reversing Fan

289-6394

289-6394

16

A-8

Valve Gp - Pilot, 2 Single Func. Lvrs

212-1301

4

A-3 to A-5

Pump Gp - Brake and Fan

288-4162

288-4162

17

C-8

Valve Gp - Pilot, 3 Single Func. Lvrs

212-1304

4

A-3 to A-5

212-1302

4

A-3 to A-5

4

A-3 to A-5

Pump Gp - Spplmnt. Steering

293-2470

293-2470

18

D-8

Valve Gp - Pilot, Joystick

212-1302

Pump Gp - Steering / Implement

163-2428

163-2428

19

B-7

Valve Gp - Pilot, Joystick / 2 Aux.

212-1307

Screen

255-0759

255-0759

20

A-7

Valve Gp - Pilot, Joystick / Aux.

212-1305

212-1305

4

A-3 to A-5

Screen As

299-5499

299-5499

21

B-8

Valve Gp - Pressure Reducing

185-5209

185-5209

24

B-6

Sensor Gp - Brake Pump Pressure

224-4536

224-4536

17

C-7

Valve Gp - Relief

251-0907

251-0907

25

E-8

Sensor Gp - Xmssm Neutralizer

290-5825

290-5825

22

D-8

Valve Gp - Ride Control

280-9978

280-9978

3

E-5

Strainer

262-5689

262-5689

20

A-7

Valve Gp - Shutoff, Hydr. Drain

6V-7238

6V-7238

24

B-6

Switch As - Axle Cooler Press.

3E-7690

3E-7690

15

B-8

Valve Gp - Sol, Plt Sht-Off/ Diff. Lck

233-7133

233-7133

26

D-6

WIRE NUMBER IDENTIFICATION CODES

CC

23

AA

HARNESS IDENTIFICATION CODE THIS EXAMPLE INDICATES WIRE 135 IN HARNESS “AG” WIRE

MAIN CONTROL CIRCUIT NUMBER IDENTIFICATION

DD

EE

PILOT CONTROL

Tap Locations Pressure, Sampling, and Sensor Description

Schematic Location

AA

Implement Pump Load Sense Pressure

B-7

BB

Steering Pump Load Sense Pressure

B-7

CC

Implement Pump Pressure

C-5

DD

Steering Pump Pressure

B-6

EE

Pilot Supply Pressure

B-6

FF

Front Brake Pressure

D-8

GG

Tilt Cylinder Rod End Pressure

D-5

HH

Tilt Cylinder Rod Head Pressure

D-5

II

Rear Axle Cooler Circuit Pressure

B-8

SOS

Hydraulic Oil Sampling Port (SOS)

A-8

FF

FRONT BRAKE VALVE (22)

BB

STEERING SIGNAL

WIRE COLOR

WIRE COLOR

WIRE GAUGE

325-PK

PREVIOUS STANDARD WIRE

22 Tap Number

CIRCUIT NUMBER IDENTIFICATION

325-AG135 PK-14

WIRE COLOR

B

325-PK-14

CIRCUIT NUMBER IDENTIFICATION

WIRE GAUGE

A

(EXAMPLE VALVE)

(Dimensions: 39 inches x 28 inches)

7 17

G

30 Page,

16

24

KENR7618-03

2

8

7

6

5

4

3

CYLINDER GP STEERING 142-6251

2

1

TO FOURTH FUNCTION

TO THIRD FUNCTION TO DRAIN MP

F

F

P CYLINDER GP COUPLER STANDARD 924H: 190-3085 WIDE 924H: 188-0982 HAND METERING UNIT 214-4153 LS

S2

E

T

LS

S3

VALVE GP COUPLER CONTROL 233-2549

T

VALVE GP RIDE CONTROL 280-9978

P

E

S1 ACCUMULATOR GP RIDE CONTROL 283-4418

CYLINDER GP LIFT 924H: 141-7483 924HZ: 152-4187

P R

C1 ACCUMULATOR GP RIDE CONTROL 298-2412

VALVE GP CHECK 9T-1013

VALVE GP RELIEF 251-0907

C2

H

T PILOT SUPPLY FROM SHUT-OFF VALVE (A-6)

S

P

T

VALVE GP INTEGRATED 3RD FUNCTION CONTROL 924H: 262-9706

FROM CONTROLLER

D

M

PUMP GP SUPPLEMENTAL STEERING 293-2470

VALVE GP BALL DEAD ENG. LOWER 112-1817

SENSOR GP TRANSMISSION NEUTRALIZER 290-5825

MANIFOLD 209-0789

N1

VALVE GP SOLENOID PILOT SHUT-OFF / DIFFERENTIAL LOCK 233-7133

VALVE GP CHECK BACK PRESSURE 212-7521

D

WIRED TO CONTROLLER

VALVE GP COMBINATION RELIEF / DVRTR 924H: 173-4032

CONNECTOR ORIFICE 3E-2335

GG

DUMP

RACKBACK

LOWER / FLOAT

RAISE

FORWARD

BACK

S5

CYLINDER GP TILT 924H: 268-9437 924HZ: 152-5306

(Dimensions: 39 inches x 28 inches)

30 Page,

KENR7618-03

TO REAR BRAKES TO FRONT AXLE DIFFERENTIAL LOCK

FF TO FRONT BRAKES

INTEGRATED 3RD FUNCTION

HH

ACCUMULATOR GP BRAKE 140-9251

CC

VALVE AS FOOT BRAKE 144-8521

TO FOURTH FUNCTION

TO THIRD FUNCTION MP

C P

SWITCH AS SEC. STEERING. 230-5771

VALVE GP 2 SECTION WITH REGENERATION 924H: 209-0270

SENSOR GP BRAKE PUMP PRESSURE 224-4536

PUMP GP BRAKE AND FAN 288-4162

VALVE GP 3 SECTION 924HZ: 209-0274

LS X

VALVE GP SHUTOFF HYDR. DRAIN 6V-7238

SWITCH AS AXLE CLR PRESS. 3E-7690

COOLER AS DUAL DISC BRAKES 205-3652

SCREEN AS 299-5499

II

VALVE GP 3 SECTION WITH REGENERATION 924H: 209-0271

VALVE GP PRESS. REDUCING 185-5209

PUMP GP IMPLEMENT / STEERING 163-2428

B

MOTOR GP AXLE OIL COOLER 288-4166

VALVE GP 4 SECTION WITH REGENERATION 924H: 209-0272

T

Note:

Highlights component used only in the 924H

Note:

Highlights component used only in the 924HZ

HYDRAULIC CIRCUIT COLOR DESCRIPTIONS IMPLEMENT PUMP OUTPUT STEERING PUMP OUTPUT

AA BB

ACCUMULATOR GP PILOT 243-4398 SWITCH AS RIDE CNTRL DSBL CONNECTOR 924H: 126-6916 ORIFICE SWITCH AS 8C-0564 FLOAT PRESS. 924HZ: 229-1537

CONNECTOR ORIFICE 8C-0564

CONNECTOR ORIFICE 8C-0564

LIFT CYLINDER AND CONTROL CIRCUIT DRAIN / RETURN LINE COUPLER CONTROL CIRCUIT IIMPLEMENT PUMP OUTPUT (NON-STEERING) TILT CYLINDER AND CONTROL CIRCUIT DIFFERENTIAL LOCK CONTROL CIRCUIT ELECTRIC LINES

CONNECTOR ORIFICE 8C-0564

BRAKE COOLING CIRCUIT

VALVE GP PILOT, JOYSTICK 212-1302

S4

B

STEERING SECONDARY PUMP AND CIRCUIT FOURTH JUNCTION CONTROL CIRCUIT STEERING CIRCUIT FAN CIRCUIT SUPPLY LINE BRAKE CONTROL CIRCUIT THIRD FUNCTION CONTROL CIRCUIT

DD

EE

COOLER HYDR. OIL 293-2240

C

VALVE GP 2 SECTION 924HZ: 209-0273

LINE PATTERNS Pressure Line Pilot / Load Sensing Pressure

VALVE GP CHECK, COOLER BYPASS 145-8983

VALVE GP SOLENOID PILOT SHUTOFF / DIFF. LOCK 233-7133

A MOTOR GP OPTIONAL REVERSING FAN 289-6394

MOTOR GP RAD. HYDR. FAN 289-6393

FILTER GP 209-3149

SCREEN 255-0759

STRAINER 262-5689

VALVE GP PILOT JOYSTICK / AUX 212-1305

WIRED TO CONTROLLER

7

Component Group Attachment

DUMP

RACKBACK

LOWER / FLOAT

RAISE

BACK

VALVE GP PILOT JOYSTICK / 2 AUX 924H: 212-1307

FORWARD

Air Line

CALLOUTS

TANK GP HYDRAULIC 289-8901

THIS SCHEMATIC IS FOR THE 924H AND 924HZ WHEEL LOADER HYDRAULIC SYSTEM MEDIA NUMBER: KENR7618-03 SCHEMATIC PART NUMBER: 289-8914, CHANGE: 03, VERSION: SCHEMATIC PART NUMBER: 289-8915, CHANGE: 03, VERSION: -

VALVE GP PILOT 3 SINGLE FUNCTION LEVERS 924HZ: 212-1304

6

5

Taps (Pressure, Sampling, Sensor - by letter)

YY

VALVE GP PILOT 2 SINGLE FUNCTION LEVERS 924HZ: 212-1301

SOS 8

Drain / Return Lines

4

3

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

2

1

A