15
12
18 20
6
25
3
19
14
9
8
10
KENR7619-01 March 2008
11
FLUID POWER SYMBOLS BASIC COMPONENT SYMBOLS
AA
MAIN AUX.
PUMP or MOTOR
TWO POSITION
HYDRAULIC PNEUMATIC ENERGY TRIANGLES
CHECK VALVES
AB
P T SHIFTED POSITION
P T NORMAL POSITION
INFINITE POSITION
VENTED
7 17 21
1
24
2
4 26 22 13
27 28
8
928HZ Wheel Loader Hydraulic System
23
5
MANIFOLD
SHUTTLE
SPRING LOADED
BASIC SYMBOL
PILOT CONTROLLED
FLUID STORAGE RESERVOIRS
14
16
FOUR-WAY
THREE-WAY
CONTROL VALVES AB
24
ATTACHMENT
LINE RESTRICTION VARIABLE and PRESSURE COMPENSATED
VALVE PORTS
TWO-WAY
THREE POSITION
PUMP: VARIABLE and PRESSURE COMPENSATED
2-SECTION PUMP
VALVES
VALVE ENVELOPES
ONE POSITION
LINE RESTRICTION (FIXED)
RESTRICTION
PRESSURE COMPENSATION
LINE RESTRICTION (VARIABLE)
SPRING (ADJUSTABLE)
VARIABILITY
CONTROL VALVES
SPRING
FLUID CONDITIONER
RETURN ABOVE FLUID LEVEL
PRESSURIZED
RETURN BELOW FLUID LEVEL
MEASUREMENT
PRESSURE
ROTATING SHAFTS
FLOW
TEMPERATURE
UNIDIRECTIONAL
BIDIRECTIONAL
COMBINATION CONTROLS
BYD1-UP CXK1-UP
SOLENOID or MANUAL
SOLENOID
SERVO
SOLENOID and PILOT or MANUAL
SOLENOID and PILOT
DETENT
THERMAL
MANUAL CONTROL SYMBOLS
15
12
6
1
20
2
4
26
14 24 13 22
8
10
5
11
MANUAL SHUTOFF
PUSH-PULL LEVER
GENERAL MANUAL
PILOT CONTROL SYMBOLS
RELEASED PRESSURE
EXTERNAL RETURN
INTERNAL RETURN
SPRING LOADED
LINES CROSSING
VARIABLE DISPLACEMENT NON-COMPENSATED
FIXED DISPLACEMENT
HYDRAULIC AND PNEUMATIC CYLINDERS
LINES JOINING
VARIABLE DISPLACEMENT NON-COMPENSATED
UNIDIRECTIONAL
UNIDIRECTIONAL
BIDIRECTIONAL
BIDIRECTIONAL
INTERNAL SUPPLY PRESSURE
COMPLETE
SINGLE ACTING
HYDRAULIC MOTORS
HYDRAULIC PUMPS
SPRING
REMOTE SUPPLY PRESSURE
CROSSING AND JOINING LINES
GAS CHARGED
FIXED DISPLACEMENT
PEDAL
SIMPLIFIED
ACCUMULATORS
MAIN CONTROL (23)
PUSH BUTTON
DOUBLE ACTING
INTERNAL PASSAGEWAYS
FLOW IN ONE DIRECTION
TWO POSITION
THREE POSITION
INFINITE POSITIONING
PARALLEL FLOW
CROSS FLOW
FLOW ALLOWED IN EITHER DIRECTION
Printed in U.S.A.
© 2008 Caterpillar All Rights Reserved
Electrical Symbols Table Hydraulic Symbols (Electrical)
18 21
25
3
19
9 27
23
28
G Transducer (Fluid)
Transducer (Gas / Air)
M
Generator
Electric Motor
Pressure Switch (Adjustable)
Pressure Switch
Electrical Wire
Temperature Switch
Component Locations Part Number
Machine Location
Schematic Location
Accumulator Gp - Brake
140-9251
1
C-7
Accumulator Gp - Pilot
243-4398
2
C-1
Accumulator Gp - Ride Control
223-9698
3
A-2
Connector - Orifice
8C-0564
4
C-5, C-4, C-3
Connector - Orifice
114-0441
5
A-3
Tap Number
Cooler - Hydraulic Oil
293-2240
6
B-8
AA
Implement Pump Pressure
C-6
Cooler As - Dual Disc Axle Oil
205-3652
7
B-8
BB
Steering Pump Pressure
D-2
Cylinder Gp - Coupler
190-3085
11
F-7
CC
Pilot Supply Pressure
C-2
Cylinder Gp - LH Steering
125-0374
9
F-8
DD
Front Brake Pressure
C-8
Cylinder Gp - Lift
119-1060
8
A-3, A-4
EE
Rear Axle Cooler Circuit Pressure
B-8
Cylinder Gp - RH Steering
125-0373
27
F-8
SOS
Hydraulic Oil Samoling Port (SOS)
A-7
Cylinder Gp - Tilt
118-8105
10
A-5
Filter Gp
209-3149
12
A-7
Hand Metering Unit
223-2223
13
E-9
Manifold
209-0787
14
C-6
Motor Gp - Axle Oil Cooler
288-4166
15
B-8
Description
Motor Gp - Radiator Fan
289-6393
16
A-7
Motor Gp - Reversing Fan
289-6394
16
A-7
Pump Gp - Brake/ Fan/ Filter
288-4162
17
B-7
Pump Gp- Implement / Steering
119-7698
19
C-6
Pump Gp - Supplementary Steer
293-2470
18
D-8
Screen
255-0759
20
A-7
Screen As
299-5499
21
B-7
Sensor Gp - Brake Pump Pressure
224-4536
22
B-6
Sensor Gp - Xmssn Neutralizer
290-5825
17
C-8
Strainer
262-5689
20
A-6
Switch As - Axle Cooler Press.
3E-7690
15
B-8
Switch As - Secondary Steering
230-5771
14
C-7
Tank Gp - Hydraulic
262-5654
20
A-6
Valve Gp - Ball, Dead Eng. Lwr
112-1817
28
A-3
Valve Gp - Check
9T-1013
13
D-8, B-2
Valve Gp - Check, Cooler Bypass
145-8983
6
B-8
Valve Gp - Check, Clr Bypass W/ Axle Oil Clr 259-0558
6
B-8
Valve Gp - Control, 2 Section
133-4234
23
B-3 to B-5
Valve Gp - Control, 3 Section
133-4235
23
B-3 to B-5
Valve Gp - Coupler Control
233-2549
11
E-7
Valve Gp - Foot Brake
144-8521
22
C-8
Valve Gp - Pilot Shut-off
233-7133
26
C-1
Valve Gp - Pilot, 2 Single Func. Lvr
201-3360
4
C-3 to C-5
Valve Gp - Pilot, 3 Single Func. Lvr
201-3362
4
C-3 to C-5
Valve Gp - Pilot, Joystick
201-3359
4
C-3 to C-5
Valve Gp - Pilot, Joystick and Aux
201-3361
4
C-3 to C-5
Valve Gp - Press Reducing
185-5209
24
C-2
Valve Gp - Relief
251-0907
25
D-8
Valve Gp - Ride Cntr. Press. Balance
141-1481
3
B-2
Valve Gp - Ride Control
297-1209
3
A-3
Valve Gp - Shutoff, Hydr. Drain
6V-7238
24
C-6
Electrical Symbols (Electrical)
Tap Locations Pressure and Sampling Description
T
Pressure Symbol
Schematic Location
Temperature Symbol
Level Symbol
Flow Symbol
Wire Number Identification Codes
Electrical Schematic Example
Hydraulic Schematic Example Current Standard
Current Standard Harness identification code This example indicates wire 135 in harness "AG".
Wire Circuit Number Identification
Wire Color
325-AG135 PK-14 325-PK Circuit Identification Number
DD
22
BB
325-PK-14
SOS
12
11
COUPLER
Wire Color
Wire
PILOT CONTROL
HYDRAULIC OIL SAMPLING
Wire Gauge
Previous Standard
CC
FRONT BRAKE VALVE (22)
22
Wire Color
B Circuit Number Identification
A
Wire Gauge (EXAMPLE VALVE)
KENR7619-01
COMPONENT LOCATIONS
(Dimensions: 39 inches x 28 inches)
7 17
24
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