17
7
3
23 26
27 14 34 35
21 30
4
47 22 48
29 36
15
6
37 38
33
32
KENR7618-05 November 2011
FLUID POWER SYMBOLS BASIC COMPONENT SYMBOLS
12 13
11
MAIN
HH
GG
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
AUX
PUMP (2 - SECTION)
VALVES
VALVE ENVELOPES
ONE POSITION
RESTRICTION
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 8
18
1
24
5 43 39 40
49
20
19
17
35
1
14
23 26
5 43
30
44 45
50 22
29 36 37
32
38 49
6
9
13 9
12
11
PRESSURE
RETURN BELOW FLUID LEVEL
ROTATING SHAFTS
TEMPERATURE
FLOW
UNIDIRECTIONAL
BIDIRECTIONAL
COMBINATION CONTROLS
RCB1-UP WLB1-UP HXC1-UP PED1-UP JRL1-UP JTM1-UP KLN1-UP RRS1-UP JZZ1-UP
41 44 45
50
7 34 27
10
31
RETURN ABOVE FLUID LEVEL
MEASUREMENT
SOLENOID
SOLENOID OR MANUAL
SOLENOID & PILOT
SOLENOID & PILOT OR MANUAL
SERVO
THERMAL
DETENT
MANUAL CONTROL SYMBOLS
PUSH - PULL LEVER
GENERAL MANUAL
MANUAL SHUTOFF
RELEASED PRESSURE
EXTERNAL RETURN
INTERNAL RETURN
SPRING LOADED
GAS CHARGED
TILT CONTROL © 2011 Caterpillar, All Rights Reserved
FIXED DISPLACEMENT
SINGLE ACTING
BIDIRECTIONAL
BIDIRECTIONAL
DOUBLE ACTING
INTERNAL PASSAGEWAYS
VARIABLE DISPLACEMENT NON-COMPENSATED
UNIDIRECTIONAL
INTERNAL SUPPLY PRESSURE
HYDRAULIC & PNEUMATIC CYLINDERS
LINES JOINING
UNIDIRECTIONAL
Volume 1 of 2: 924H and 924HZ Wheel Loader
COMPLETE
HYDRAULIC MOTORS
VARIABLE DISPLACEMENT NON-COMPENSATED
SPRING
REMOTE SUPPLY PRESSURE
SIMPLIFIED
LINES CROSSING
HYDRAULIC PUMPS FIXED DISPLACEMENT
PEDAL
CROSSING & JOINING LINES
ACCUMULATORS
16
PUSH BUTTON
PILOT CONTROL SYMBOLS
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
G
18
8
19
20
24
21
47
3
4
10
39 40 41
48
M
TRANSDUCER (FLUID)
TRANSDUCER (GAS / AIR)
GENERATOR
ELECTRIC MOTOR
PRESSURE SWITCH
PRESSURE SWITCH (ADJUSTABLE)
TEMPERATURE SWITCH
ELECTRICAL WIRE
15 31 33
COMPONENT LOCATIONS ELECTRICAL SYMBOLS (ELECTRICAL)
Component Locations NAME
PART NO. 924H
PART NO. 924HZ
Machine Location
Schematic Location
Accumulator Gp - Brake
362-9032
362-9032
1
C-7, C-8
Accumulator Gp - Pilot
243-4398
243-4398
2
B-5
Switch As - Axle Cooler Press.
3E-7690
126-6916
NAME Strainer
PART NO. 924H
PART NO. 924HZ
Machine Location
Schematic Location
262-5689
262-5689 3E-7690
26
A-7
27
B-8
28
B-5
Accumulator Gp - Ride Control
283-4418
283-4418
3
E-6
Switch As - Ride Contr Disable
Accumulator Gp - Ride Control
298-2412
298-2412
4
E-6
Switch As - Sec. Steering
230-5771
230-5771
29
D-6
Connector - Orifice
8C-0564
8C-0564
5
A-3 to A-5
Tank Gp- Hydraulic Oil
262-5654
262-5654
30
A-6
Connector - Orifice
3E-2335
3E-2335
6
D-4
Valve As - Foot Brake
144-8521
144-8521
31
C-8
Cooler - Hydraulic Oil Cooler
293-2240
293-2240
7
B-8
Valve Gp - Ball, Dead Eng. Lwr
112-1817
112-1817
32
D-5
Cooler As - Dual Disc Brakes
205-3652
205-3652
8
B-8
Valve Gp - Check
9T-1013
9T-1013
33
E-8
Cylinder Gp - Lift
141-7483
152-4187
9
E -4
Valve Gp - Check, Cooler Bypass
145-8983
145-8983
34
B-8
Cylinder Gp - Steering
142-6251
142-6251
10
F-8
Valve Gp - Check, Clr Bypass, W/ Axle Oil Clr
259-0558
259-0558
35
B-8
Cylinder Gp - Tilt
268-9437
152-5306
11
D-4
Valve Gp - Check, Back Press.
212-7521
212-7521
36
D-6
Cylinder Gp - Coupler, Standard
190-3085
12
F-7
Valve Gp - Combination, Rlf/ Dvtr
173-4032
37
D-5
Cylinder Gp - Coupler, W ide
188-0982
13
F-7
Valve Gp - Coupler Control
363-7916
38
E-7
Filter Gp
209-3149
209-3149
14
A-8
Valve Gp - Implmnt 2 Sec. W / Regen
209-0270
39
B-3 to B-5
Hand Metering Unit
354-2953
354-2953
15
E-8
Valve Gp - Implmnt 3 Sec. W / Regen
209-0271
40
B-3 to B-5
Manifold
209-0789
209-0789
16
D-6
Valve Gp - Implmnt 4 Sec. W / Regen
209-0272
41
B-3 to B-5
Motor Gp - Axle Oil Cooler
288-4166
288-4166
17
B-8
Valve Gp - Load Sense Resolver
8J-6875
42
Motor Gp - Radiator Hydr. Fan
289-6393
289-6393
18
Motor Gp - Reversing Fan
289-6394
289-6394
19
Valve Gp - Pilot, Joystick
212-1302
A-7
Valve Gp - Pilot, Joystick / 2 Aux.
212-1307
A-7
T
PRESSURE SWITCH
43 44
A-3 to A-5
212-1305
212-1305
45
A-3 to A-5
Pump Gp - Brake and Fan
288-4162
288-4162
20
B -7
Pump Gp - Spplmnt. Steering
293-2470
293-2470
21
D-8
Valve Gp - Pressure Reducing
185-5209
185-5209
46
B-5
Pump Gp - Steering / Implement
163-2428
163-2428
22
C-7
Valve Gp - Relief
251-0907
251-0907
47
E-8
Screen
255-0759
255-0759
23
A-7
Valve Gp - Ride Control
280-9978
280-9978
48
E-5
Screen As
299-5499
299-5499
24
B-7
Valve Gp - Shutoff, Hydr. Drain
6V-7238
6V-7238
49
B-6
Sensor Gp - Xmssm Neutralizer
290-5825
290-5825
25
C-8
Valve Gp - Sol, Plt Sht-Off/ Diff. Lck
233-7133
233-7133
50
B-6, D-5
CC
28
AA
Implement Pump Load Sense Pressure
C-6
BB
Steering Pump Load Sense Pressure
C-7
CC
Implement Pump Pressure
C-5
DD
Steering Pump Pressure
B-6
EE
Pilot Supply Pressure
B-6
FF
Front Brake Pressure
C-8
GG
Tilt Cylinder Rod End Pressure
D-4
HH
Tilt Cylinder Rod Head Pressure
D-5
II
Rear Axle Cooler Circuit Pressure
B-8
JJ
Coupler Cylinder Pressure
E-6
Hydraulic Oil Sampling Port (SOS)
A-8
SOS
CURRENT STANDARD
CIRCUIT NUMBER IDENTIFICATION
MAIN CONTROL
DD
EE
PILOT CONTROL
WIRE COLOR
WIRE COLOR
WIRE GAUGE
325-PK
38
FF
JJ
COUPLER CONTROL
WIRE COLOR
B
325-PK-14
CIRCUIT NUMBER IDENTIFICATION
FRONT BRAKE VALVE
CIRCUIT NUMBER IDENTIFICATION
PREVIOUS STANDARD WIRE
BB
STEERING SIGNAL
CURRENT STANDARD
325-AG135 PK-14
Tap Locations Pressure, Sampling, and Sensor Schematic Location
HYDRAULIC SCHEMATIC EXAMPLE
AA
25 Description
ELECTRICAL SCHEMATIC EXAMPLE
WIRE
42
Tap Number
FLOW SWITCH
HARNESS IDENTIFICATION CODE THIS EXAMPLE INDICATES WIRE 135 IN HARNESS “AG”
A-3 to A-5
Valve Gp - Pilot, Joystick / Aux.
LEVEL SWITCH
WIRE NUMBER IDENTIFICATION CODES
C-5
212-1302
TEMPERATURE SWITCH
WIRE GAUGE
A
(EXAMPLE VALVE)
(Dimensions: 39 inches x 28 inches)
46
30 Page,
2
KENR7618-05 VOL 1 of 2
HYDRAULIC SYMBOLS (ELECTRICAL)