RENR6432-01
20 Page, (Dimensions: 39 inches x 24 inches)
Hydraulic Symbols (Electrical)
Electrical Symbols Table
325-AG135 PK-14
Circuit Identification
Number
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 Color
Circuit Number
Identification
B
A
Wire
Wire
(EXAMPLE VALVE)
Current Standard
Transducer
(Fluid)
Transducer
(Gas / Air)
G
Generator
Electrical Wire
Pressure Switch
M
Electric Motor
Pressure Switch
(Adjustable)
Temperature Switch
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
Electrical Symbols (Electrical)
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 RESTRICTION
VARIABLE 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 CONDITIONER
PUMP or MOTOR
FLUID POWER SYMBOLS
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
VALVES
PILOT CONTROL SYMBOLS
RELEASED PRESSURE
EXTERNAL RETURN
INTERNAL RETURN
REMOTE SUPPLY PRESSURE
SIMPLIFIED
COMPLETE
INTERNAL
SUPPLY PRESSURE
ACCUMULATORS
SPRING LOADED
GAS CHARGED
SOLENOID
or MANUAL
SOLENOID
and PILOT
SOLENOID and
PILOT or MANUAL
COMBINATION CONTROLS
SOLENOID
SERVO
THERMAL
DETENT
HYDRAULIC AND PNEUMATIC CYLINDERS
DOUBLE ACTING
SINGLE ACTING
BASIC
SYMBOL
SPRING
LOADED
CHECK VALVES
TWO
POSITION
INFINITE
POSITIONING
FLOW IN ONE
DIRECTION
FLOW ALLOWED IN
EITHER DIRECTION
THREE
POSITION
CROSS
FLOW
PARALLEL
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
T
RENR6432-01
May 2008
924G and 924GZ Wheel Loader
Hydraulic System
DDA1-UP
RTA1-UP
RBB1-UP
WMB1-UP
WGX1-UP
DFZ1-UP
©
2008 Caterpillar
All Rights Reserved
Printed in U.S.A.
9
9
9 13
13
11
1114
3
3 8
8
8
10
10
5
5
23
23
1
12
2
24
24
6
6
7
7
12
12
15
1516
16
17
17 18
18
19
19
21
21
22
22
20
20
4
426
26
924G
COMPONENT LOCATIONS
12
SOS
OIL FILTER
IMPLEMENT PUMP
AA
STEERING PUMP LOAD SENSE
BB
IMPLEMENT PUMP PRESSURE
CC
23
ABOVE IMPLEMENT VALVES
FOOT BRAKE
FF
22
DD
EE
GG
HH
14
Tap Locations
Pressure and Sampling
Tap
Number
Description
Schematic
Location
AA Implement Pump Load Sense Pressure B-8
BB Steering Pump Load Sense Pressure B-8
CC Implement Pump Pressure C-6
DD Steering Pump Pressure B-7
EE Pilot Supply Pressure A-7
FF Front Brake Pressure B-9
GG Tilt Cylinder Rod End Pressure C-6
HH Tilt Cylinder Rod Head Pressure C-6
II R
ear Axle Cooler Circui
t Pressure B-9
SOS Hydraulic Oil Sampling Port (SOS) A-9
Note: Refer to Parts Manuals for your specific machine.
COMPONENT LOCATIONS
Description
Part No.
924G
Part No.
924GZ
Machine
Location
Schematic
Location
Accumulator Gp -Brake 140-9251 140-9251 1 B-9,C-9
Accumulator Gp -Pilot 243-4398 243-4398 2 A-7
Accumulator Gp -Ride Control 223-9698 223-9698 3 D-7
Connector -Orifice 8C-0564 8C-0564 4 A-4 to A-6
Connector -Orifice 3E-2335 3E-2335 5 C-6
Cooler -Hydraulic Oil Cooler, Standard 239-7394 239-7394 6 A-9
Cooler -Hydraulic Oil Cooler, Heavt Du
t 239-7395 239-7395 6 A-9
Cooler As -Dual Disc Axle Oil 205-3652 205-3652 7 B-9
Cylinder Gp -Lift 141-7483 152-4187 8 C-6
Cylinder Gp -Steering 142-6251 142-6251 9 E-9
Cylinder Gp -Tilt 268-9437 152-5306 10 C-6
Cylinder Gp -Coupler, Standard 190-3085 11 E-8
Cylinder Gp -Coupler, Wide 188-0982 11 E-8
Filter Gp -Element 126-1818 209-3149 209-3149 12 A-9
Hand Metering Unit 214-4153 214-4153 13 D-9
Manifold 209-0789 209-0789 14 C-8
Motor Gp -Axle Oil Cooler 205-5268 205-5268 15 A-9
Motor Gp -Radiator Hydr. Fan 205-3669 205-3669 16 A-8
Motor Gp -Reversing Fan 205-3778 205-3778 16 A-9
Pump Gp -Brake / Fan / Filter 262-2875 262-2875 17 A-8
Pump Gp -Spplmnt. Steering 205-5266 205-5266 18 C-9
Pump Gp -Steering / Implement 163-2428 163-2428 19 B-8
Screen As 247-8298 247-8298 21 B-9
Sensor Gp -Brake Pump Pressure 224-4536 224-4536 17 B-8
Sensor Gp -Xmssm Neutralizer 290-5825 290-5825 22 C-9
Switch As -Axle Cooler Press. 3E-7690 3E-7690 15 B-9
Switch As -Float Press. 229-1537 23 A-6
Switch As -Ride Contr Disable 126-6916 23 A-6
Switch As -Sec. Steering 230-5771 230-5771 14 C-8
Tank Gp-Hydraulic Oil 201-8108 201-8108 20 A-8
Valve As -Foot Brake 144-8521 144-8521 22 B-9
Valve Gp -Ball, Dead Eng. Lwr 112-1817 112-1817 5 C-6
Valve Gp -Check 9T-1013 9T-1013 13 D-9, D-8, D-6
Valve Gp -Check, Back Press. 212-7521 212-7521 14 C-8
Valve Gp -Combination, Rlf/ Dvtr 173-4032 14 C-6
Valve Gp -Coupler Control 233-2549 14 D-8
Valve Gp -Implement 2 Section 209-0273 23
B-4 to B-6,
D-1 to D-3
Valve Gp -Implmnt 2 Sec. W/ Regen 209-0270 23
B-4 to B-6,
D-1 to D-3
Valve Gp -Implement 3 Section 209-0274 23
Valve Gp -Implmnt 3 Sec. W/ Regen 209-0271 23
Valve Gp -Implmnt 4 Sec. 209-0275 23
Valve Gp -Implmnt 4 Sec. W/ Regen 209-0272 23
Valve Gp -Intgrtd 3rd Fnct. Cntrl 262-9706 23 E-2
Valve Gp -Pilot, 2 Single Func. Lvrs 212-1301 212-1301 4
A-4 to A-6,
C-1 to C-3
Valve Gp -Pilot, 3 Single Func. Lvrs 212-1304 212-1304 4
A-4 to A-6,
C-1 to C-3
Valve Gp -Pilot, 4 Single Func. Lvrs 212-1306 212-1306 4
Valve Gp -Pilot, Joystick 212-1302 212-1302 4
Valve Gp -Pilot, Joystick / 2 Aux. 212-1307 212-1307 4
Valve Gp -Pilot, Joystick / Aux. 212-1305 212-1305 4
Valve Gp -Pressure Reducing 185-5209 185-5209 24 B-7
Valve Gp -Relief 251-0907 251-0907 25 C-9
Valve Gp -Ride Control 141-1481 141-1481 3 D-7
Valve Gp -Shutoff, Hydr. Drain 6V-7238 6V-7238 24 B-7
Valve Gp -Pilot Shut-Off 233-7133 233-7133 26 A-7
Valve Gp -Sol, Ride Control 297-1209 297-1209 26 D-7
RENR6432-01
20 Page, Color 2, (Dimensions: 39 inches x 24 inches)
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 924G AND 924GZ
PART NUMBER: 203-3878, CHANGE: 04, VERSION: (-)
PART NUMBER: 203-3879, CHANGE: 03, VERSION: (-)
Components are shown installed on a fully operable machine.
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
DRAIN / RETURN LINE
LINES GROUP COLOR DESCRIPTIONS
STEERING / PILOT PUMP CIRCUIT
IMPLEMENT PUMP CIRCUIT
STEERING CIRCUIT
PILOT
AXLE OIL
SUPPLY LINE
COUPLER CYLINDER
LOAD SENSING
THIRD FUNCTION
SECONDARY STEERING PUMP
LIFT CYLINDERS
FOURTH FUNCTION
TILT CYLINDERS
AXLE COOLING / BRAKE / FAN PUMP CIRCUIT
AXLE COOLING / FAN CIRCUIT
A
B
C
D
E
12345678
9
A
B
C
D
E
12345678
9
S3
S2
P
T
N1
T
LS
P
S3
S2
S1
DUMP LOWER /
FLOAT
RACKBACK
WIRED TO CONTROLLER
RAISE
M
FROM CONTROLLER
P
LS
T
TO FOURTH FUNCTION
TO REAR BRAKES
TO FRONT BRAKES
TO THIRD FUNCTION
AXLE OIL
S4
O
P
T
A1
A2
EF
BACK
FORWARD
DUMP LOWER /
FLOAT
RACKBACK
WIRED TO CONTROLLER
RAISE
P
LS
T
TO FOURTH FUNCTIONTO THIRD FUNCTION
PT3
P
T
C1
C2
PILOT SUPPLY
(FROM SHUT-OFF VALVE)
INTEGRATED THIRD FUNCTION
TANK GP
HYDRAULIC
201-8108
VALVE GP
2 SECTION
WITH REGENERATION
924G: 209-0270
VALVE GP
3 SECTION
WITH REGENERATION
924G: 209-0271
VALVE GP
4 SECTION
WITH REGENERATION
924G: 209-0272
VALVE GP
CHECK
BACK PRESSURE
212-7521
VALVE AS
FOOT BRAKE
144-8521
VALVE GP
PRESS. REDUCING
185-5209
VALVE GP
RELIEF
251-0907
VALVE GP
PILOT,
JOYSTICK
212-1302
VALVE GP
PILOT
JOYSTICK / AUX
212-1305
VALVE GP
PILOT
JOYSTICK / 2 AUX
924G: 212-1307
VALVE GP
RIDE CONTROL
141-1481
CYLINDER GP
LIFT
924G: 141-7483
924GZ: 152-4187
MANIFOLD
209-0789
ACCUMULATOR GP
PILOT
243-4398
MOTOR GP
AXLE OIL
COOLER
205-5268
COOLER
HYDR. OIL
STANDARD : 239-7394
HEAVY DUTY : 239-7395
HAND METERING UNIT
214-4153
PUMP GP
SUPPLEMENTAL
STEERING
205-5266
CYLINDER GP
STEERING
142-6251
ACCLMTR.GP
BRAKE
140-9251
PUMP GP
BRAKE AND FAN
262-2875
MOTOR GP
OPTIONAL
REVERSING FAN
289-6394
FILTER GP
209-3149
CONNECTOR
ORIFICE
8C-0564
CONNECTOR
ORIFICE
8C-0564
CONNECTOR
ORIFICE
8C-0564
VALVE GP
BALL
DEAD ENG. LOWER
112-1817
COOLER AS
DUAL DISC BRAKES
205-3652
SWITCH AS
RIDE CNTRL DSBL
924G: 126-6916
SWITCH AS
FLOAT PRESS.
924GZ: 229-1537
SWITCH AS
SEC. STEERING.
230-5771
SENSOR GP
TRANSMISSION
NEUTRALIZER
290-5825
SENSOR GP
BRAKE PUMP
PRESSURE
224-4536
SWITCH AS
AXLE CLR PRESS.
3E-7690
SCREEN AS
247-8298
CONNECTOR
ORIFICE
3E-2335
VALVE GP
SHUTOFF
HYDR. DRAIN
6V-7238
ACCUMULATOR GP
RIDE CONTROL
223-9698
CYLINDER GP
COUPLER
STANDARD
924G: 190-3085
WIDE
924G: 188-0982
VALVE GP
COUPLER CONTROL
233-2549
VALVE GP
COMBINATION
RELIEF / DVRTR
924G: 173-4032
VALVE GP
INTEGRATED 3RD FUNCTION CONTROL
924G: 262-9706
VALVE GP
SOLENOID
PILOT SHUTOFF
233-7133
MOTOR GP
RAD. HYDR. FAN
289-6393
VALVE GP
PILOT
2 SINGLE FUNCTION LEVERS
924GZ: 212-1301
VALVE GP
PILOT
3 SINGLE FUNCTION LEVERS
924GZ: 212-1304
VALVE GP
2 SECTION
924GZ: 209-0273
VALVE GP
3 SECTION
924GZ: 209-0274
VALVE GP
PILOT
3 SINGLE FUNCTION LEVERS
924GZ: 212-1306
VALVE GP
4 SECTION
924GZ: 209-0275
VALVE GP
CHECK
9T-1013
VALVE GP
CHECK
9T-1013
CYLINDER GP
TILT
924G: 268-9437
924GZ: 152-5306
VALVE GP
SOLENOID
RIDE CONTROL
297-1209
PUMP GP
IMPLEMENT /
STEERING
163-2428
AA
BB
CC
DD
EE
FF
GG
HH
II
SOS
INDICATES COMPONENTS
USED ON 924G ONLY
INDICATES COMPONENTS
USED ON 924GZ ONLY
NOTE A: USED ON 924GZ
NOTE A
