15 LL
3 24
16
17
FF
55 58 35
57
HH
50
2 27 32
FLUID POWER SYMBOLS BASIC COMPONENT SYMBOLS
37
11
56
36
8 54 CC
RENR2117-02 January 2009
14 28 33 GG
DD
53
MM
16
6
MAIN
PUMP OR MOTOR
FLUID CONDITIONER
SPRING
CONTROL VALVES
VARIABILITY
SPRING (ADJUSTABLE)
LINE RESTRICTION (VARIABLE)
PRESSURE COMPENSATION
RESTRICTION
LINE RESTRICTION (FIXED)
25 31 34
TWO POSITION
PUMP (VARIABLE & PRESSURE COMPENSATED)
ATTACHMENT
LINE RESTRICTION (VARIABLE & PRESSURE COMPENSATED)
VALVE PORTS
THREE POSITION
TWO - WAY
THREE - WAY
CONTROL VALVES AB
PUMP (2 - SECTION)
VALVES
VALVE ENVELOPES
ONE POSITION
HYDRAULIC PNEUMATIC ENERGY TRIANGLES
AUX
FOUR - WAY
CHECK VALVES
A B
P T
P T
NORMAL POSITION
SHIFTED POSITION
BASIC SYMBOL
INFINITE POSITION
SHUTTLE
SPRING LOADED
PILOT CONTROLLED
FLUID STORAGE RESERVOIRS
PRESSURIZED
VENTED
966G and 972G Wheel Loader Hydraulic System 966G: AAH1-UP 3ZS1-UP 9RS1-UP 3PW1-UP 3SW1-UP 8XW1-UP
13
18
20
29
8 59
21
30
37
51
7
9
PRESSURE
ROTATING SHAFTS
TEMPERATURE
FLOW
SOLENOID
SOLENOID OR MANUAL
SOLENOID & PILOT
SOLENOID & PILOT OR MANUAL
MANUAL SHUTOFF
PUSH - PULL LEVER
GENERAL MANUAL
LL
13
15
17
35
18
56
28
6
52
57
29
11
53
LINES CROSSING
COMPLETE
FIXED DISPLACEMENT
SINGLE ACTING
LINES JOINING
BIDIRECTIONAL
BIDIRECTIONAL
DOUBLE ACTING
INTERNAL PASSAGEWAYS INFINITE POSITIONING
VARIABLE DISPLACEMENT NON-COMPENSATED
UNIDIRECTIONAL
INTERNAL SUPPLY PRESSURE
HYDRAULIC & PNEUMATIC CYLINDERS
HYDRAULIC MOTORS
VARIABLE DISPLACEMENT NON-COMPENSATED
SPRING
REMOTE SUPPLY PRESSURE
SIMPLIFIED
UNIDIRECTIONAL
Volume 1 of 2: Brakes, Pilot Implements, and HMU Steering
BB
DETENT
PEDAL
CROSSING & JOINING LINES
GAS CHARGED
FIXED DISPLACEMENT
16 DD 50 MM 59
THERMAL
PUSH BUTTON
INTERNAL RETURN
HYDRAULIC PUMPS
AA
SERVO
PILOT CONTROL SYMBOLS
RELEASED PRESSURE
5
ACCUMULATORS
51 54
BIDIRECTIONAL
MANUAL CONTROL SYMBOLS
EXTERNAL RETURN
4 19
UNIDIRECTIONAL
COMBINATION CONTROLS
972G: 7LS1-UP AAW1-UP 1EW1-UP 4WW1-UP 6AW1-UP 9GW1-UP
SPRING LOADED
55 58
RETURN BELOW FLUID LEVEL
MEASUREMENT
52
JJ
RETURN ABOVE FLUID LEVEL
3 POSITION
FLOW IN ONE DIRECTION
PARALLEL FLOW
CROSS FLOW
2 POSITION
FLOW IN EITHER DIRECTION
9 © 2009 Caterpillar, All Rights Reserved
Printed in U.S.A.
ELECTRICAL SYMBOLS TABLE
17 TRANSDUCER (FLUID)
TRANSDUCER (GAS / AIR)
GENERATOR
ELECTRIC MOTOR
PRESSURE SWITCH
PRESSURE SWITCH (ADJUSTABLE)
TEMPERATURE SWITCH
ELECTRICAL WIRE
ELECTRICAL SYMBOLS (ELECTRICAL)
STEERING PUMP 3 24
36
20
KK
21
HH
8
37
51
7
GG
2 27 32
T
PRESSURE SWITCH
5
TEMPERATURE SWITCH
FLOW SWITCH
WIRE NUMBER IDENTIFICATION CODES
14 28 33
ELECTRICAL SCHEMATIC EXAMPLE
HYDRAULIC SCHEMATIC EXAMPLE
CURRENT STANDARD
CURRENT STANDARD
25 31 34
JJ
LEVEL SWITCH
HARNESS IDENTIFICATION CODE THIS EXAMPLE INDICATES WIRE 135 IN HARNESS “AG”
KK
WIRE
COMPONENT LOCATIONS
CIRCUIT NUMBER IDENTIFICATION
325-AG135 PK-14
MM
CIRCUIT NUMBER IDENTIFICATION
WIRE COLOR
WIRE COLOR
WIRE GAUGE
325-PK
PREVIOUS STANDARD WIRE
Component Locations Part Number
Machine Location
Schematic Location
Connector - Orifice
128-7063
1
D-4 to D-5
Accumulator As - Ride Control
108-5933
2
Cooler
130-8842
Cooler As - Brake Oil Cooling Attachment
134-2454
Description
Cylinder Gp - Auxiliary
Part Number
Machine Location
Valve Gp - Pilot
144-0115
28
F-4
Valve Gp - Pilot, Shut Off
112-1817
29
D-5
3
B-5
4
A-6
Valve Gp - Pilot (Oil Manifold, 2 Funct.) Pilot (Oil Manifold, 3 Funct.)
152-6480 152-6481
30
D-4 to D-5
5
F-6
Valve Gp - Relief (Line, Aux, HE)
4T-2742
31
E-7
32
F-6
33
F-5
Description
Cylinder Gp - Lift (LH)
133-2964
6
F-4
Valve Gp - Relief (Line, Aux, RE)
4T-4162
Cylinder Gp - Lift (RH)
133-2963
7
F-4
Cylinder Gp - Steering
133-1747
8
C-2
Cylinder Gp - Tilt, 966 972
144-9005 133-2962
9
F-5
Valve Gp - Relief (Line,Tilt, RE, HE) Standard 2 And 3 Valve Relief (Line, Tilt, RE), Logging Relief (Line,Tilt, HE), Logging
6E-2377 9T-8488 4T-2764
Elbow - Orifice
108-2144
10
Filter Gp - Oil, Hydr. (Fan / Cooler Flow)
134-3016
11
B-6
Manifold Gp - (Lift, Standard)
130-2073
12
E-4
Motor Gp - Hydraulic Fan
161-8919
13
Plate - Orifice
8V-2080
14
Pump and Motor Gp - Sec. Steering
154-2563
15
A-5
Pump Gp - HMU
147-7343
16
B-4
Pump Gp - Hydraulic Fan
162-0772
17
B-6
Pump Gp - Steering Implement Pilot / Brake
167-1154
18
B-4
34
Valve Gp - Secondary Steering (Diverter)
141-2597
35
B-5
Valve Gp - Steering
142-3996
36
B-2 to B-3
F -5
Valve Gp - Steering Neutralizer
146-7571
37
C-4
Accumulator Gp - Brake (Charged)
198-9841
50
F-2
Actuator As - Parking Brake
154-8042
51
F-1
Control Gp - Foot Brake
193-1448
52
F-2
Sensor Gp - Position (Rotary, Lft Brk Pdl)
214-4863
53
F-3
Switch As - Limit (Stop Light)
105-6117
54
F-3
Switch As - Pressure (Parking Brakes)
3E-6452
55
E-1
Switch As - Pressure (Low Pressure Warning)
3E-7693
56
D-3
B-7
6E-5065
19
A-7
Tank Gp - Hydraulic
133-1843
20
A-6 to A-7 A-7
Valve - Breaker Relief
9T-0818
21
Valve Gp - Check (Air Purge)(Air Bleed)
3G-8607
22
Valve Gp - Check (Ride Control)
9T-3096
23
E-4
Valve Gp - Cooler Bypass
9T-6005
24
B-5
Valve Gp - Diverter (Ride Control)
137-3520
25
E-4
Valve Gp - Flow Divider (Axle Oil Cooler)
133-1729
26
B-6
27
E-4 to E-7
120-7477 120-7475 120-7473 120-7611
Standard Logging
6E-6003 6E-6185
Screen Gp
Valve Gp - Main Control, 2 Func., Standard 3 Func. Logging 3 Func., (Attch) Control, 1 Func., Field Conversion
Valve Gp - Relief, Main
Schematic Location
E-7
WIRE COLOR
Tap Locations Pressure and Sampling Tap Number
Description
B
325-PK-14
Schematic Location
AA
Tilt Cylinder Rod End Pressure
F-5
BB
Tilt Cylinder Head End Pressure
F-5
CC
Rear Service Brake Pressure
F-3
DD
Front Service Brake Presseure
F-3
FF
Service Brake Accumulator Pressure
D-2
GG
Implement Pilot Pump Pressure
D-4
HH
Implement Pump Pressure
C-7
JJ
Fluid Sampling Valve
B-6
KK
Steering Pump Pressure
B-3
LL
Fan Drive Pump Pressure
B-6
MM
Steering Signal Pressure
A-4
CIRCUIT NUMBER IDENTIFICATION
WIRE GAUGE
A
(EXAMPLE VALVE)
FRONT, RIGHT VIEW OF HITCH
BRAKES
Valve Gp - Accumulator
229-9984
57
E-3
Valve Gp - Brake Control (Parking)
106-1774
58
D-1
Valve Gp - Brake Control (Service)
210-5587
59
F-2
50 55
FF
SERVICE BRAKES ACCUM CHARGING VALVE
CC
DD
SERVICE BRAKES CONTROL VALVE
(Dimensions: 34 inches x 28 inches)
M
24 Page,
G
RENR2117-02 VOL 1 of 2
HYDRAULIC SYMBOLS (ELECTRICAL)