UENR3883 November 2012
FLUID POWER SYMBOLS BASIC COMPONENT SYMBOLS MAIN
Component Location Part Machine Number Location 213-8773 1 355-9981 2 3 325-7159 129-8090 4 258-2829 5 122-2340 6 271-0263 7
Description Accumulator - Brake Accumulator - Pilot Accumulator - Ride Control Actuator GP - Parking Brake Breather Connector - Orifice Control GP - Foot Brake
Schematic Location F-2 F-4 F-5 F-1 A-7 A-3 E-6
HAND METERING UNIT
FRONT OF FRAME
20
57
25
54
G4
61
24
G5
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
AUX
PUMP (2 - SECTION)
PUMP (VARIABLE & PRESSURE COMPENSATED)
LINE RESTRICTION (VARIABLE & PRESSURE COMPENSATED)
VALVES
VALVE ENVELOPES
ONE POSITION
RESTRICTION
ATTACHMENT
VALVE PORTS
THREE POSITION
TWO - WAY
THREE - WAY
FOUR - WAY
Cooler - Hyd Oil
313-7721 242-4272 242-4271 311-1463 314-9338
Cylinder GP -Tilt 950 Standard 962 Standard
242-4270 247-0497
High Lift Logger Filter - Axle Oil Cooler Filter GP - Oil Filter GP - Oil
245-7491 245-7487 251-6351 337-4102 330-9358 242-1307
Manifold -Fan Drive and Brake Charge
B-8
9 10 11 12 13
C-7 F-6 F-2 D-6 B-1, D-2
246-6152 275-8544 215-3013 254-5146 292-8767 349-6093 241-9299 241-8692 154-2883 9T-9227 340-5659 328-4314 346-0475 328-0730 335-1074 114-1267 180-8585 4T-7581 8J-6875 353-7179 106-1774 215-3687 307-5393 130-5202 111-7775 244-1426 124-8635 142-4000 234-4869
2
G2
14
F-7
15 16 17
C-6, F-8 A-7 B-8
P T
950H, 962H, and IT62H Wheel Loader Hydraulic System
3
950H: N1A4397-UP JAD410-UP M1G2111-UP K5K2761-UP
B-8 A-7 C-6 B-8 B-7 A-3 B-6 B-7 D-2 B-8 A-7 F-5, F-6, F-7 A-6, E-7 E-4 E-4 C-2 D-7 E-5 C-3 C-5 F-1 F-2 B-8 C-6 D-3 B-8 D-1 B-2 F-6
Valve GP - Manual Lowering Valve GP - Manual Valve GP - Pilot Command Control Steering Valve GP - Relief (Auxiliary) Valve GP - Relief (Tilt) Valve GP - Relief Pump Backup Valve GP - Relief Steering Cylinder Crossover Valve GP - Relief Tilt (Logger) Valve GP - Secondary Steering Valve GP - Shuttle Valve GP - Solenoid Valve GP - Steering Neutralizer (CCS) Valve GP - Steering Neutralizer (HMU)
112-1817 8T-6907 147-1790 272-2334 332-1987 132-5258 129-8222 332-1985 141-2597 235-6157 313-7668 321-5283 296-5662
48
F-4
49 50 51 52 53 54 55 56 57 58 59 60 61
B-7, D-6, F-7 A-7 D-3 F-5 F-6 B-5 B-5 F-2 B-7 E-5 E-5, E-6, F-5, F-6 C-2, D-2 B-6
PRESSURIZED
RETURN ABOVE FLUID LEVEL
13
55
962H: N4A2116-UP M3G679-UP K6K517-UP MAL123-UP
PRESSURE
ROTATING SHAFTS
TEMPERATURE
FLOW
SOLENOID
SOLENOID OR MANUAL
46
E-7
G3
Implement Pump Load Sense Pressure
B-7
SPRING LOADED
GENERAL MANUAL
Steering Pump Discharge Pressure
G5
Steering Pump Load Sense Pressure
G6
Fan Pump Discharge Pressure
B-7
G7
Fan Pump Load Sense Pressure
B-8
G8
CCS Steering Neutral Pilot Pressure
C-3
G9
CCS Steering Left Pilot Pressure
D-2
G10
CCS Steering Right Pilot Pressure
D-2
G11
CCS Steering Resolved Pilot Pressure
C-3
G12 B
Case Drain Air Bleed Front Brake Pressure
A-8 F-2
C
Rear Brake Pressure
F-2
Scheduled Oil Sampling
B-8
SOS
FIXED DISPLACEMENT
11
© 2012 Caterpillar, All Rights Reserved
BIDIRECTIONAL
BIDIRECTIONAL
29 C
7
B
38
5
INTERNAL PASSAGEWAYS INFINITE POSITIONING
3 POSITION
FLOW IN ONE DIRECTION
PARALLEL FLOW
CROSS FLOW
Printed in U.S.A.
G3
ELECTRICAL SYMBOLS TABLE
53
HYDRAULIC SYMBOLS (ELECTRICAL)
G TRANSDUCER (FLUID)
TRANSDUCER (GAS / AIR)
GENERATOR
ELECTRIC MOTOR
PRESSURE SWITCH
PRESSURE SWITCH (ADJUSTABLE)
TEMPERATURE SWITCH
ELECTRICAL WIRE
4 26
18
22
44
8
36
6
M
52
ELECTRICAL SYMBOLS (ELECTRICAL)
T
39
SOS
37
PRESSURE SWITCH
TEMPERATURE SWITCH
48
LEVEL SWITCH
FLOW SWITCH
WIRE NUMBER IDENTIFICATION CODES
ELECTRICAL SCHEMATIC EXAMPLE
HYDRAULIC SCHEMATIC EXAMPLE
CURRENT STANDARD
CURRENT STANDARD
60 31
HARNESS IDENTIFICATION CODE THIS EXAMPLE INDICATES WIRE 135 IN HARNESS “AG” WIRE CIRCUIT NUMBER IDENTIFICATION
325-AG135 PK-14
30
CIRCUIT NUMBER IDENTIFICATION
WIRE COLOR
WIRE
G8
17 16
49
33
59
58
43 45 55 C-8
G5
27
G9
G10
41
50
G12
AXLE OIL COOLING
E-6 F-6
G6
E-5 F-5 F-5 E-6 F-6 F-4
G7
F-5 E-5 F-6 F-7 D-7
G1
21
9
42 15
WIRE COLOR
WIRE GAUGE
325-PK
PREVIOUS STANDARD
56
Schematic Location
FLOW IN EITHER DIRECTION
32
34
SOLENOID VALVE REFERENCE
2 POSITION
NOT SHOWN INSIDE (29)TANK GP - HYDRAULIC
19
G11
Demand Speed Fan Solenoid Lower Solenoid Raise Solenoid Ride Control Balance Solenoid Ride Control Head End Check Solenoid Ride Control Rod End Check Solenoid Dump Solenoid Rack Back Solenoid Implement Pilot Support Solenoid 3rd Function Port A Solenoid 3rd Function Port B Solenoid Lower Anti-drift Solenoid Dump Anti-drift Solenoid Enable Solenoid
DOUBLE ACTING
MAIN CONTROL VALVE
28
1
Fan / Brake Valve Implement Valve - Lift Implement Valve - Lift Implement Valve - Ride Control Implement Valve - Ride Control Implement Valve - Ride Control Implement Valve - Tilt Implement Valve - Tilt Implement Valve Implement Valve - 3rd Function Implement Valve - 3rd Function Implement Valve - Lift Implement Valve - Tilt Quick Coupler Valve
SINGLE ACTING
VARIABLE DISPLACEMENT NON-COMPENSATED
UNIDIRECTIONAL
CIRCUIT NUMBER IDENTIFICATION
Solenoid Name
HYDRAULIC & PNEUMATIC CYLINDERS
LINES JOINING
UNIDIRECTIONAL
INTERNAL SUPPLY PRESSURE
FAN AND BRAKE SYSTEM
A-3, D-1
Solenoid Location
COMPLETE
HYDRAULIC MOTORS
VARIABLE DISPLACEMENT NON-COMPENSATED
SPRING
REMOTE SUPPLY PRESSURE
SIMPLIFIED
LINES CROSSING
WIRE COLOR
B
325-PK-14
Solenoid Valve E1 E2 E3 E4 E5 E6 E7 E8 E9 E10 E11 E12 E13 E14
DETENT
PEDAL
CROSSING & JOINING LINES
GAS CHARGED
FIXED DISPLACEMENT
47
B-6
THERMAL
PUSH BUTTON
INTERNAL RETURN
HYDRAULIC PUMPS
C-8, E-2
G4
SERVO
PILOT CONTROL SYMBOLS
EXTERNAL RETURN
Schematic Location
Implement Pump Discharge Pressure
SOLENOID & PILOT OR MANUAL
MANUAL SHUTOFF
RELEASED PRESSURE
10
51
G2
BIDIRECTIONAL
MANUAL CONTROL SYMBOLS
ACCUMULATORS
Tap Location Pressure and Sampling
Brake Accumulator Pressure
UNIDIRECTIONAL
SOLENOID & PILOT
COMMAND CONTROL STEERING
G1
PILOT CONTROLLED
IT62H: M5G468-UP
14
23
Description
SHUTTLE
RETURN BELOW FLUID LEVEL
MEASUREMENT
PUSH - PULL LEVER
40
Tap Number
SPRING LOADED
COMBINATION CONTROLS
C-8 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47
BASIC SYMBOL
INFINITE POSITION
35
12 261-4171 261-3682 261-4172 261-3683 256-3643
SHIFTED POSITION
FLUID STORAGE RESERVOIRS
Valve GP - Main Control Two Function without Ride Control Two Function with Ride Control Three Function without Ride Control Three Function with Ride Control With Ride Control (Logger)
P T
NORMAL POSITION
E-2
18
CHECK VALVES
A B
VENTED
352-1587 Motor GP - Fan Pump and Motor GP - Secondary Steering Pump GP - Axle Oil Cooler Pump GP - Fan and Hyd Brake Pump GP - Implement Pump GP - Metering (HMU) Pump GP - Steering Pump GP - Transmission Screen AS - Command Control Steering Screen AS - Implement/Steering Return Tank GP - Hydraulic Valve - Anti-drift Solenoid Valve - Load Sense Relief Valve - Margin Relief Valve - Pressure Reducing Pilot Supply Valve - Pressure Reducing Pilot Supply Valve - Quick Coupler Valve - Ride Control Relief Valve - Shuttle CCS Pilot Valve GP - Check Backpressure Valve GP - Brake Control (Parking) Valve GP - Foot Brake Valve GP - Check Anti-Drainback Valve GP - Check Axle Oil-Cooler Valve GP - Check Command Control Steering Valve GP - Check Cooler Bypass Valve GP - Command Control Steering Valve GP - HMU Steering Valve GP - Make-up Lift
CONTROL VALVES AB
WIRE GAUGE
A
(EXAMPLE VALVE)
(Dimensions: 39 inches x 28 inches)
Attachment Core AS - Axle Oil Cooler Cylinder GP - Lift (Left) Cylinder GP - Lift (Right) Cylinder GP - Quick Coupler Cylinder GP - Steering
8
30 Page,
244-5427 250-8327
UENR3883
Standard
8
7
6
5
4
3
2
1
FRONT AXLE
CYLINDER-TILT 242-4270 (950 STANDARD) 247-0497(962 STANDARD) 245-7491(HIGH LIFT) 245-7487 (LOGGER)
CYLINDER GP LIFT (RH) 242-4271
CYLINDER GP- LIFT (LH) 242-4272
VALVE GP MANUAL LOWERING 112-1817
VALVE GP - MAIN CONTROL TWO FUNCTION WITHOUT RIDE CONTROL: 261-4171 TWO FUNCTION WITH RIDE CONTROL: 261-3682 THREE FUNCTION WITHOUT RIDE CONTROL: 261-4172 THREE FUNCTION WITH RIDE CONTROL: 261-3683 THREE FUNCTION WITH RIDE CONTROL (LOGGER): 256-3643
NO
C
B2
E13
VALVE GP SOLENOID (ANTI-DRIFT) 328-4314
A3
VALVE GP SOLENOID 313-7668
B3
VALVE GP-RELIEF ( AUXILIARY) 272-2334 B4
F VALVE GP - PARKING BRAKE 106-1774
A4
E5
E8
SWITCH AS BRAKE PRESSURE 175-3244
E3
RACK BACK
PORT A
NC NO
ACTUATOR AS PARKING BRAKE 129-8090 TRANSMISSION CONTROL
A2
C
MANIFOLD GP FAN AND BRAKE CHARGE 242-1307
A1
PS
SWITCH AS PARKING BRAKE PRESSURE 174-4312
C
REAR AXLE
VALVE GP TILT 332-1987
VALVE GP SOLENOID (ANTI-DRIFT) 328-4314
RAISE
RACK BACK
VALVE GP SOLENOID (RACK BACK) 313-7668
E4
HOLD
HOLD
PUMP GP - FAN 254-5146
HOLD
VALVE GP RELIEF RIDE CONTROL 4T-7581
LOWER
DUMP
G1
G9
PORT A
G2
IMPLEMENT RETURN
APPLY
NC
E10
RAISE
RELEASE
ACCUMULATOR GP PILOT OIL 355-9981
E9
E12
E6
E
C
C
FRONT AXLE
FILTER-MAGNETIC (AXLE OIL COOLER) 251-6351
ACCUMULATOR - SERVICE BRAKE: 213-8773
VALVE GP FOOT BRAKE 215-3687
NC
B
VALVE GP MAKE-UP (LIFT) 234-4869 A2
VALVE GP SOLENOID (ANTI-DRIFT) 328-4314
CONTROL GP FOOT BRAKE 271-0263
TO TRANSMISSION CONTROL
PORT A LEVER FORWARD, LEFT HAND LINE ON BOOM (WHEN VIEWED FROM CAB)
F
B1
LIGHTS
PORT B LEVER REARWARD, RIGHT HAND LINE ON BOOM (WHEN VIEWED FROM CAB)
VALVE GP 332-1987 (TILT) 332-1985 (TILT-LOGGER)
A1
TO BRAKE
ACCUMULATOR-RIDE CONTROL 325-7159
VALVE PRESSURE REDUCING 335-1074
PORT B
F TO FAN MOTOR
E
FLOAT
AXLE OIL COOLER SUPPLY FLOW
T
P
LS AXLE OIL COOLER RETURN FLOW
VALVE BREAKER RELIEF 220-0814
QUICK COUPLER SUPPLY IMPLEMENT LOAD SENSE RELIEF/PILOT RETURN IMPLEMENT LOAD SENSE SIGNAL
VALVE GP SOLENOID (LOWER) 313-7668
VALVE GP SOLENOID (DUMP) 313-7668
IMPLEMENT PUMP DISCHARGE
DUMP
VALVE LOAD SENSE RELIEF 346-0475
PRIMARY PILOT SUPPLY - CCS STEERING ATTACHMENT
VALVE GP SHUTTLE 235-6157
E7
TO CASE DRAIN MANIFOLD
VALVE GP SOLENOID 313-7668
LOWER/ FLOAT E2
HYDRAULIC TANK
BRAKE SYSTEM
PORT B E11
VALVE MARGIN RELIEF 328-0730
PRIMARY PILOT SUPPLY - CCS STEERING ATTACHMENT IMPLEMENT LOAD SENSE RELIEF/PILOT RETURN CYLINDER GP STEERING 314-9338
CYLINDER GP QUICK COUPLER 311-1463
CYLINDER GP QUICK COUPLER 311-1463
VALVE-QUICK COUPLER 180-8585
CYLINDER GP STEERING 314-9338
VALVE GP-RELIEF STEERING CYLINDER CROSSOVER 129-8222
VALVE GP COMMAND CONTROL STEERING 124-8635
E14
SCREEN AS COMMAND CONTROL STEERING 154-2883
D VALVE GP - CHECK COMMAND CONTROL STEERING 111-7775 VALVE GP - PILOT COMMAND CONTROL STEERING 147-1790
B
D
A
LS
A
G9 G10 G5
VALVE GP-MANUAL LOWERING 112-1817
(Dimensions: 39 inches x 28 inches)
30 Page,
UENR3883
PA
ACCUMULATOR BRAKE 213-8773
VALVE GP-CHECK BACKPRESSURE 353-7179
TO SERVICE BRAKE VALVE UPPER PORT (REAR AXLE)
TO SERVICE BRAKE VALVE LOWER PORT (FRONT AXLE)
PUMP GP - AXLE OIL COOLER 215-3013 P
JACKET WATER (COOLANT)
A2
A1
G8
CORE AS AXLE OIL COOLER 313-7721
C G1
VALVE PRESSURE REDUCING PILOT SUPPLY 114-1267
P
C
T
VALVE GP - RELIEF PUMP BACKUP 132-5258
C
COMMAND CONTROL STEERING ATTACHMENT
E1
VALVE GP-CHECK (AXLE OIL COOLER BYPASS) 130-5202
HMU STEER AND 3PC IMPLEMENT
REAR AXLE
VALVE GP-CHECK (AXLE OIL COOLER BYPASS) 130-5202 VALVE GP MANUAL LOWERING 112-1817
MOTOR GP-FAN 246-6152
F
VALVE GP - HMU STEERING 142-4000 VALVE GP-RELIEF STEERING CYLINDER CROSSOVER 129-8222
IMPLEMENT RETURN
CYLINDER GP STEERING 314-9338
AXLE OIL COOLER SUPPLY
VALVE GP CHECK COOLER BYPASS 244-1426
COOLER - HYD OIL STANDARD: 244-5427 ATTACHMENT: 250-8327
P
LS
T
AXLE OIL COOLER RETURN
G7
PB
QUICK COUPLER SUPPLY
B
IMPLEMENT LOAD SENSE RELIEF/PILOT RETURN
A
G6 PUMP GP FAN AND HYD BRAKE 254-5146
B
SOS
B
T
G11
VALVE - SHUTTLE CCS PILOT 8J-6875
FILTER-MAGNETIC (AXLE OIL COOLER) 251-6351
PS
MANIFOLD GP-CONTROL (FAN DRIVE AND BRAKE CHARGE) 352-1587
PB VALVE GP STEERING NEUTRALIZER (CCS) 321-5283
ACCUMULATOR BRAKE 213-8773
X PUMP GP - IMPLEMENT 292-8767
VALVE GP CHECK ANTI-DRAINBACK 307-5393
LINE PATTERNS
LS
B
P PUMP GP - STEERING 241-9299
PUMP GP - TRANSMISSION 241-8692 G
IMPLEMENT PUMP OUTPUT IMPLEMENT PILOT SUPPLY OIL
Pilot / Load Sensing Pressure
PRIMARY STEERING PUMP CIRCUIT STEERING CIRCUIT
Drain / Return Lines
SECONDARY STEERING CIRCUIT IMPLEMENT PUMP LOAD SENSING CIRCUIT
S
Attachment
T LS S
G12
Air Line
A
L
CALLOUTS S
FILTER GP-OIL 337-4102
YY
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
Pressure Line
Component Group L
B
IMPLEMENT PUMP DISCHARGE
A
G4
FILTER GP-OIL 330-9358
PA
IMPLEMENT LOAD SENSE SIGNAL
G3
Taps (Pressure, Sampling,Sensor) by letter
MAIN RELIEF VALVE LOAD SENSING CIRCUIT SUPPLY LINE DRAIN / RETURN LINE LIFT CYLINDER CIRCUIT TILT CYLINDER CIRCUIT AUXILIARY CIRCUIT
CYLINDER GP STEERING 314-9338
VALVE GP STEERING NEUTRALIZER (HMU)
VALVE GP STEERING NEUTRALIZER (HMU)
P
HMU
T
CONNECTOR ORIFICE 122-2340
CONNECTOR ORIFICE 122-2340
BRAKE CHARGE VALVE AND FAN CONTROL CIRCUIT BRAKE CONTROL CIRCUIT
VALVE GP - RELIEF PUMP BACKUP 132-5258
VALVE GP MANUAL 8T-6907
R
L PUMP GP METERING (HMU) 349-6093
M
A BREATHER 258-2829
A
C PUMP AND MOTOR GP SECONDARY STEERING 275-8544
TANK GP - HYDRAULIC 340-5659
VALVE GP SECONDARY STEERING 141-2597
LS SCREEN AS STEERING RETURN 9T-9227
T
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.
G5
B
8
7
6
5
4
P
THIS SCHEMATIC IS FOR THE 950H, 962H AND IT62H WHEEL LOADER HYDRAULIC SYSTEM MEDIA NUMBER: UENR3883 SCHEMATIC PART NUMBER: 241-0475, CHANGE: 11, VERSION: BRAKE SYSTEM PART NUMBER: 244-1398, CHANGE: 01, VERSION: -
3
2
1