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CAT 950H and 962H Wheel Loader Hydraulic System

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Schematic Symbols
and Definitions page
INTERACTIVE SCHEMATIC
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FUNCTION
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KEYS
“CTRL” / “-”
“CTRL” / “0” (zero)
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Find
“CTRL” / “F”
Pressure
Switch
Temperature
Switch
Level
Switch
Flow
Switch
Circuit Breaker
T
ELECTRICAL SYMBOLS
Spring
(Adjustable)
Variability
Fluid
Conditioner
Pump
or Motor
BASIC HYDRAULIC
COMPONENT SYMBOLS
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SCHEMATIC SYMBOLS AND DEFINITIONS
HYDRAULIC SYMBOLS - ELECTRICAL
Transducer
(Fluid)
Transducer
(Gas / Air)
G
Generator
Electrical
Wire
Pressure
Switch
M
Electric
Motor
Pressure Switch
(Adjustable)
Temperature
Switch
Pressure
Switch
Temperature
Switch
Level
Switch
Flow
Switch
Circuit Breaker
T
ELECTRICAL SYMBOLS
Spring
Control
Valves
Restriction
Line Restriction
(Fixed)
2-Section
Pump
MAIN
AUX.
Spring
(Adjustable)
Variability
Line Restriction
(Variable)
Pressure
Compensation
Pump: Variable and
Pressure Compensated
Hydraulic Pneumatic
Energy Triangles
Fluid
Conditioner
Attachment
Pump
or Motor
BASIC HYDRAULIC
COMPONENT SYMBOLS
Line Restriction
Variable and Pressure
Compensated
Vented Pressurized Return Above Fluid Level Return Below Fluid Level
FLUID STORAGE RESERVOIRS
Pressure
Temperature
Flow
MEASUREMENT
Unidirectional
Bidirectional
ROTATING SHAFTS
One Position
Two Position
Three Position
Two-way
Three-Way
Four-Way
ENVELOPES
PORTS
CONTROL
Basic
Symbol
Spring
Loaded
Normal Position
A B
P T
A B
P T
Shifted Position
Infinite Position
Shuttle
Pilot
Controlled
VALVES
CHECK
Solenoid
or Manual
Solenoid
and Pilot
Solenoid and
Pilot or Manual
Solenoid
Servo
Thermal
Detent
COMBINATION CONTROLS
T
Fuse: A component in an electrical circuit that will open the circuit if too much current flows through it.
Switch (Normally Open): A switch that will close at a specified point (temp, press, etc.). The circle indicates
that the component has screw terminals and a wire can be disconnected from it.
Switch (Normally Closed): A switch that will open at a specified point (temp, press, etc.).
No circle indicates that the wire cannot be disconnected from the component.
Ground (Wired): This indicates that the component is connected to a grounded wire.
The grounded wire is fastened to the machine.
Ground (Case): This indicates that the component does not have a wire connected to ground.
It is grounded by being fastened to the machine.
Reed Switch: A switch whose contacts are controlled by a magnet. A magnet closes the contacts of
a normally open reed switch; it opens the contacts of a normally closed reed switch.
Sender:
A component that is used with a temperature or pressure gauge.
The sender measures the temperature or pressure.
Its resistance changes to give an indication to the gauge of the temperature or pressure.
Relay (Magnetic Switch):
A relay is an electrical component that is activated by electricity.
It has a coil that makes an electromagnet when current flows through it.
The electromagnet can open or close the switch part of the relay.
Solenoid:
A solenoid is an electrical component that is activated by electricity.
It has a coil that makes an electromagnet when current flows through it.
The electromagnet can open or close a valve or move a piece of metal that can do work.
Magnetic Latch Solenoid:
An electrical component that is activated by electricity and held latched by a
permanent magnet. It has two coils (latch and unlatch) that make electromagnet
when current flows through them. It also has an internal switch that places
the latch coil circuit open at the time the coil latches.
BASIC ELECTRICAL COMPONENT SYMBOLS
Push-pull Lever PedalGeneral Manual Push Button SpringManual Shutoff
MANUAL CONTROL
External Return
Internal Return
Simplified
Complete
Internal
Supply Pressure
RELEASED PRESSURE
REMOTE SUPPLY PRESSURE
PILOT CONTROL
Spring Loaded
Gas Charged
ACCUMULATORS
Crossing
Joining
LINES
Double Acting
Single Acting
CYLINDERS
Unidirectional
Bidirectional
FIXED DISPLACEMENT
VARIABLE DISPLACEMENT
NON- COMPENSATED
PUMPS
Unidirectional
Bidirectional
Unidirectional
Bidirectional
FIXED DISPLACEMENT
VARIABLE DISPLACEMENT
NON- COMPENSATED
MOTORS
Unidirectional
Bidirectional
Two
Position
Infinite
Positioning
FLOW IN ONE
DIRECTION
FLOW ALLOWED IN
EITHER DIRECTION
Three
Position
CROSS
FLOW
PARALLEL
FLOW
INTERNAL PASSAGEWAYS
1
2
AG-C4
111-7898
L-C12
3E-5179
9X-1123
Component
Part Number
Pin or Socket Number
Part Number: for
Connector Plug
Harness Identification Letter(s): (A, B, C, AA, AB, AC, ...)
Plug
325-AG135 PK-14
Wire Color
Wire Gauge
Receptacle
1
1
2
2
Sure-Seal connector: Typical representation
of a Sure-Seal connector. The plug and receptacle
contain both pins and sockets.
Deutsch connector: Typical representation
of a Deutsch connector. The plug contains all
sockets and the recept
acle contains all pins.
Fuse (5 Amps)
5A
Harness identification code:
This example indicates wire group 325,
wire 135 in harness "AG".
L-C12
3E-5179
Wire, Cable, or Harness Assembly Identification:
Includes Harness Identification Letters and Harness
Connector Serialization Codes (see sample).
Harness Connector Serialization Code: The "C" stands for
"Connector" and the number indicates which connector in the
harness (C1, C2, C3, ...)
HARNESS AND WIRE SYMBOLS
UENR2502
July 2012
950H and 962H Wheel Loader
Hydraulic System
950H:
MXL1-UP
JLX1-UP
962H:
SSA1-UP
PCW1-UP
Printed in U.S.A.© 2012 Caterpillar, All Rights Reserved
COMPONENT TABLE
Description
Part
Number
Machine
Location
Schematic
Location
Accumulator - Brake (Front Axle) 213-8773
Accumulator - Brake (Rear Axle) 213-8773
Accumulator - Pilot 355-9981
Accumulator - Ride Control 360-6812
Actuator GP - Parking Brake 126-7698
Breather 258-2829
Control GP - Foot Brake 217-0263
Cooler - Hyd Oil
Standard
Attachment
244-5427
250-8327
Core AS - Axle Oil Cooler 313-7721
Cylinder GP - Lift (Left) 381-4584
Cylinder
GP - Lift (Right) 381-4585
Cylinder GP - Quic
k Coupler 311-1463
Cylinder GP - Steering 314-9338
Cylinder GP - Tilt
950 Standard
962 Standard
High Lift
Logger
356-2217
356-2218
358-5187
358-5188
Filter - Axle Oil Cooler Front 251-6351
Filter - Axle Oil Cooler Rear 251-6351
Filter GP - Kidney Loop 378-8331
Manifold - Fan Drive and Brake Charge
Non-CE Certified
CE Certified
366-9955
352-1587
Motor GP - Fan 246-6152
Pump and Mot
or GP - Sec
ondary Steering 275-8544
Pump GP - Axle Oil Cooler 215-3013
Pump GP - Fan and Hyd Brake 254-5146
Pump GP - Implement 367-8077
Pump GP - Metering (HMU) 349-6093
Pump GP - Steering 367-8078
Pump GP - Transmission 241-8692
Screen AS - Case Drain 328-1511
Screen AS - Command Control Steering 154-2883
Screen AS - Implement Return 9T-9227
Screen AS - Steering Return 9T-9227
Solenoid - 3rd Function Port A 313-7668
S
olenoid - 3rd Func
tion Port B 313-7668
Solenoid - Ride Control Activation 277-8863
Solenoid - Ride Control Charge / Balance On / Off 313-7668
Tank GP - Hydraulic 368-2756
Component Location
Valve - Load Sense Relief 375-3788
Valve - Margin Relief 370-5764
Valve - Pressure Reducing Pilot Supply 114-1267
Valve - Quick Coupler 371-9415
Valve - Ride Control Pressure Limiting 363-1612
Valve - Ride Control Relief 358-7333
V
alv
e - Shuttle CCS Pilot 8J-6875
Valve GP - 3rd Function 366-8542
Valve GP - Backpressure 349-8844
Valve GP - Brake Control (Parking) 106-1774
Valve GP - Brake Control (Service) 215-3687
Valve GP - Check Anti-Drainback 307-5393
Valve GP - Check Command Control Steering 111-7775
Valve GP - Check Cooler Bypass 244-1426
Valve GP - Command Control Steering 124-8635
Valve GP - HMU Steering 142-4000
Valve GP - Load Sense B
oos
t Check 123-4750
Valve GP - Main Control (Two Function)
With Out Ride Control
With Ride Control
With Ride Control (Logger)
364-0641
364-0640
373-4925
Valve GP - Manual Lowering 112-1817
Valve GP - Manual Release 1 112-1817
Valve GP - Manual Release 2 112-1817
Valve GP - Pilot Accumulator Check 6E-4701
Valve GP - Pilot Command Control Steering 147-1790
Valve GP - Pressure Reducing 367-8969
Valve GP - Relief (Tilt) 33
2-1987
Valv
e GP - Relief Pump Backup 132-5258
Valve GP - Relief Steering Cylinder Crossover 129-8222
Valve GP - Relief
Tilt
Tilt (Logger)
332-1987
332-1985
Valve GP - Secondary Steering 141-2597
Valve GP - Solenoid (Dump) 313-7668
Valve GP - Solenoid (Lower) 313-7668
Valve GP - Solenoid (Rack Back) 313-7668
Valve GP - Solenoid (Raise) 313-7668
Valve GP - Solenoid Pilot Pressure 333-8242
Valve GP - Steering Neutralizer
(CCS) 321-5283
Valv
e GP - Steering Neutralizer (HMU) 129-8222
Description
Part
Number
Machine
Location
Schematic
Location
Component Location
36 E-3
37 E-3
38 A-2
39 D-4
40 E-1
41 E-1
42 A-3
43 C-2
44 E-4
45 F-6
46 E-6
47 C-8
48 B-3
49 C-8
50 A-2
51 B-4
52 E-4
53 F-1
54 F-4
55 C-7
56 C-4
57 E-4
58 A-3
59 E-4
60 F-3
61 B-5
62 B-5
63 F-2
64 B-7
65 D-3
66 E-2
67 F-3
68 F-2
69 F-3
70 A-3
71 B-6
1 D-8
2 D-7
3 F-3
4 F-1
5 F-6
6 B-7
7 E-6
8 C-8
9 C-7
10 F-2
11 F-2
12 C-3
13 B-4
14 F-3
15 D-4
16 C-6
17 B-8
18 C-8
19 C-8
20 B-7
21 D-6
22 B-8
23 C-7
24 A-6
25 B-6
26 B-7
27 B-8
28 B-3
29 B-8
30 B-7
31 D-1
32 C-2
33 F-2
34 E-1
35 A-8
TAP TABLE
Tap
Number
Description
Schematic
Location
G1 Brake Accumulator Pressure D-8
G2 Implement Pump Discharge Pressure E-3
G3 Implement Pump Load Sense Pressure C-7
G4 Implement Pilot Pressure E-4
G5 Steering Pump Discharge Pressure C-7
G6 Steering Pump Load Sense Pressure B-2, A-6
G7 Fan Pump Discharge Pressure C-7
G8 Fan Pump Load Sense Pressure C-7
G9 CCS Steering Neutral Pilot Pressure A-2
G10 CCS Steering Left Pilot Pressure B-3
G11 CCS Steering Right Pilot Pressure B-2
G12 CCS Steering Resolved Pilot Pressure A-3
G13 Case Drain Air Bleed B-8
B Front Brake Pressure E-7
C Rear Brake Pressure E-7
SOS Scheduled Oil Sampling C-8
Tap Location
Pressure and Sampling
UENR2502
30 Page, (Dimensions: 39 inches x 28 inches)
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.
BRAKE SCHEMATIC PART NUMBER: 244-1398, CHANGE: 01, VERSION: -
THIS SCHEMATIC IS FOR THE 950H AND 962H WHEEL LOADER HYDRAULIC SYSTEM
MAIN SCHEMATIC PART NUMBER: 368-1357, CHANGE: 00, VERSION: -
MEDIA NUMBER: UENR2502
12345678
A
B
C
D
E
F
12345678
A
B
C
D
E
F
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
PILOT PUMP OUTPUT
MAIN PUMP OUTPUT
FAN OUTPUT
SECONDARY STEERING CIRCUIT
SECONDARY STEERING PUMP OUTPUT
STEERING CIRCUIT
SUPPLY LINE
BRAKE CIRCUIT
AXLE OIL COOLING PUMP OUTPUT
DRAIN / RETURN LINE
TILT CIRCUIT
LIFT CIRCUIT
3RD FUNCTION CIRCUIT
LOAD SENSE CIRCUIT
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
CALLOUTS
Taps (Pressure, Sampling, Sensor - by letter)
YY
(52) VALVE GP - CONTROL
138-1234
Callout Number
(Machine Location from
Component LocationsTable)
Component
Name
Part Number
BRAKE SYSTEM
IMPLEMENT SYSTEM
COMMAND CONTROL STEERING
HAND METERING UNIT
JACKET
WATER
(COOLANT)
REAR AXLE
LS
P
T
PS
A1
A2
E1
F
HMU
PA
PB
T
B
A
P
B
S
L
X
M
L
R
P
T
LS
IMPLEMENT RETURN
IMPLEMENT PUMP DISCHARGE
IMPLEMENT LOAD SENSE SIGNAL
IMPLEMENT LOAD SENSE RELIEF/PILOT RETURN
QUICK COUPLER SUPPLY
AXLE OIL COOLER RETURN
AXLE OIL COOLER SUPPLY
X1
L2
L1
S1
X2
L4
L3
S2
IMPLEMENT LOAD SENSE RELIEF/PILOT RETURN
PRIMARY PILOT SUPPLY - CCS STEERING ATTACHMENT
T
P
LS
PA
PB
B
A
P
T
PORT A LEVER FORWARD,
LEFT HAND LINE ON BOOM
(WHEN VIEWED FROM CAB)
PORT B LEVER REARWARD,
RIGHT HAND LINE ON BOOM
(WHEN VIEWED FROM CAB)
FRONT AXLE
PRIMARY PILOT SUPPLY - CCS STEERING ATTACHMENT
AXLE OIL COOLER RETURN FLOW
IMPLEMENT PUMP DISCHARGE
IMPLEMENT LOAD SENSE SIGNAL
IMPLEMENT LOAD SENSE RELIEF/PILOT RETURN
QUICK COUPLER SUPPLY
AXLE OIL COOLER SUPPLY FLOW
IMPLEMENT RETURN
HOLD
PORT
A
PORT
B
PORT
A
PORT
B
E9
E10
E11
PED RELIEF
RACK
BACK
HOLD
DUMP
RAISE
HOLD
LOWER
FLOAT
T
P
DR1
LS
ACC
LS1
PS
PS (AUX)
PILOT ON/OFF
P (AUX)
RC MANIFOLD
FLOW CONTROL VALVE
ON/OFF SOLENOID
(CHARGE/BALANCE)
PRESSURE LIMITER
RC ACTIVATION
SPOOL
ACC
E2
E3
E4
E5
E6
E7
E8
TRANSMISSION
CONTROL
DIFFERENTIAL OIL
TEMP WARNING
DIFFERENTIAL OIL
TEMP WARNING
NC
NO
C
C
TO TRANSMISSION CONTROL
TO BRAKE
LIGHTS
APPLY
RELEASE
REAR AXLE
C
NO
NC
A
A
C
C
B
B
G13
G8
G7
G1
G3
G5
G6
G12
G9
G4
G2
G6
G10
G11
SOS
B
C
(29) SCREEN AS - IMPLEMENT RETURN
9T-9227
(35) TANK GP - HYDRAULIC
368-2756
(6) BREATHER
258-2829
(27) SCREEN AS - CASE DRAIN
328-1511
(30) SCREEN AS. - STEERING RETURN
9T-9227
(64) VALVE GP
SECONDARY STEERING
141-2597
(20) PUMP AND MOTOR GP
SECONDARY STEERING
275-8544
(22) PUMP GP
FAN AND HYD BRAKE
254-5146
(19) MOTOR GP - FAN
246-6152
(49) VALVE GP - CHECK
COOLER BYPASS
244-1426
(47) VALVE GP - CHECK
ANTI-DRAINBACK
307-5393
(17) FILTER GP
KIDNEY LOOP
378-8331
(8) COOLER - HYD OIL
STD. 244-5427
ATCH. 250-8327
(18) MANIFOLD - FAN DRIVE AND BRAKE CHARGE
NON-CE CERTIFIED: 366-9955
CE CERTIFIED: 352-1587
(1) ACCUMULATOR
BRAKE (FRONT AXLE)
213-8773
(2) ACCUMULATOR
BRAKE (REAR AXLE)
213-8773
(9) CORE AS
AXLE OIL COOLER
313-7721
(21) PUMP GP
AXLE OIL COOLER
215-3013
(55) VALVE GP
MANUAL RELEASE 1
112-1817
(16) FILTER
AXLE OIL COOLER
REAR
251-6351
(23) PUMP GP
IMPLEMENT
367-8077
(25) PUMP GP - STEERING
367-8078
(26) PUMP GP
TRANSMISSION
241-8692
(51) VALVE GP - HMU STEERING
142-4000
(62) VALVE GP - RELIEF
STEERING CYLINDER CROSSOVER
129-8222
(61) VALVE GP - RELIEF
PUMP BACKUP
132-5258
(13) CYLINDER GP
STEERING
314-9338
(24) PUMP GP
METERING (HMU)
349-6093
(71) VALVE GP
STEERING NEUTRALIZER (HMU)
129-8222
(58) VALVE GP - PILOT
COMMAND CONTROL STEERING
147-1790
(48) VALVE GP - CHECK
COMMAND CONTROL STEERING
111-7775
(70) VALVE GP - STEERING
NEUTRALIZER (CCS)
321-5283
(28) SCREEN AS
COMMAND CONTROL STEERING
154-2883
(50) VALVE GP
COMMAND CONTROL STEERING
124-8635
(38) VALVE - PRESSURE REDUCING
PILOT SUPPLY
114-1267
(42) VALVE - SHUTTLE
CCS PILOT
8J-6875
(39) VALVE - QUICK COUPLER
371-9415
(12) CYLINDER GP
QUICK COUPLER
311-1463
(56) VALVE GP
MANUAL RELEASE 2
112-1817
(32) SOLENOID - 3RD FUNCTION
PORT B
313-7668
(31) SOLENOID - 3RD FUNCTION
PORT A
313-7668
(34)SOLENOID - RIDE CONTROL
CHARGE / BALANCE ON / OFF
313-7668
(40)VALVE - RIDE CONTROL
PRESSURE LIMITING
363-1612
(41)VALVE - RIDE CONTROL
RELIEF
358-7333
(4)ACCUMULATOR
RIDE CONTROL
360-6812
(53)VALVE GP - MAIN CONTROL (TWO FUNCTION)
WITH OUT RIDE CONTROL: 364-0641
WITH RIDE CONTROL: 364-0640
WITH RIDE CONTROL(LOGGER): 373-4925
(11)CYLINDER GP - LIFT
(RIGHT)
381-4585
(10)CYLINDER GP - LIFT
(LEFT)
381-4584
(65)VALVE GP
SOLENOID (DUMP)
313-7668
(66)VALVE GP
SOLENOID (LOWER)
313-7668
(67)VALVE GP
SOLENOID (RACK BACK)
313-7668
(68)VALVE GP
SOLENOID (RAISE)
313-7668
(14)CYLINDER GP - TILT
950 STANDARD:356-2217
962 STANDARD:356-2218
HIGH LIFT:358-5187
LOGGER:358-5188
(3)ACCUMULATOR
PILOT
355-9981
(43)VALVE GP
3RD FUNCTION
366-8542
(54)VALVE GP-MANUAL LOWERING
112-1817
(69)VALVE GP
SOLENOID
PILOT PRESSURE
333-8242
(59)VALVE GP
PRESSURE REDUCING
367-8969
(57)VALVE GP
PILOT ACCUMULATOR
CHECK
6E-4701
(44)VALVE GP
BACKPRESSURE
349-8844
(52)VALVE GP
LOAD SENSE
BOOST CHECK
123-4750
(15) FILTER
AXLE OIL COOLER
(FRONT)
251-6351
(36) VALVE
LOAD SENSE
RELIEF
375-3788
(37) VALVE
MARGIN RELIEF
370-5764
(63)VALVE GP
RELIEF
TILT: 332-1987
TILT (LOGGER):332-1985
(60)VALVE GP
RELIEF (TILT)
332-1987
(7)CONTROL GP - FOOT BRAKE
271-0263
(46)VALVE GP - BRAKE CONTROL
(SERVICE)
215-3687
(5) ACTUATOR GP
PARKING BRAKE
126-7698
(45)VALVE GP - BRAKE CONTROL
(PARKING)
106-1774
(33)SOLENOID
RIDE CONTROL ACTIVATION
277-8863
HAND METERING UNIT
G6G5
7164
62
61
51
25 2420
13
FRONT OF FRAME
G4
G2
59
56
55
53
39
14
12
11
10
4
3
FAN AND BRAKE SYSTEM
C B
SOS
G13
G8
G7
G3
G1
54
49
47
46
45
44
35
NOT SHOWN
INSIDE (35) TANK GP - HYDRAULIC
30
NOT SHOWN
INSIDE (35) TANK GP - HYDRAULIC
29
NOT SHOWN
INSIDE (35) TANK GP - HYDRAULIC
27
2623 22
19
18
17
8
7 6
5
21
VIEW ALL CALLOUTS
COMMAND CONTROL STEERING
G12
G11G10
G9
G6
70
58
50
48
42
38
28
AXLE OIL COOLING
21 16 159
MAIN CONTROL VALVE
NOT SHOWN
INSIDE (53) MAIN CONTROL
6968 67
666563 60
5752
43
4140
37
36 34
33
32
31

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