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INTERACTIVE SCHEMATIC
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Cover PageInformation
SchematicMachine Views
Component TableTap Table
Fluid Power Symbols
Electrical Symbols
Front Frame
Rear Frame
Tap Views
Features
Options
Bookmarks X
EC-C3EC-C2 E-C60
EC-C1
E-C61
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RENR8828-04January 2012
966H and 972H Wheel LoaderHydraulic System966H:A6D1-UPRYF1-UPA6G1-UPA6J1-UPTAL1-UP
972H:GTA1-UPLCC1-UPA7D1-UPA7G1-UPA7J1-UP
Printed in U.S.A.© 2012 Caterpillar, All Rights Reserved
COMPONENT TABLE
Description PartNumber
MachineLocation
SchematicLocation
Accumulator Gp - Pilot 355-9981 1 E-1Accumulator. Gp - Ride Control 325-7131 2 F-2
Cylinder Gp - Lift 242-4274242-4275
(LH)(RH)
3
F-2
Cylinder Gp - TiltLift
Tilt
Cylinder Gp - Tilt - 966 Logger (Atch)
(966 Standard)(972 Standard)
Cylinder Gp - Tilt - (966 High Lift - Atch)Tilt - (972 High Lift - Atch)
356-2220356-2219
358-5190358-5189
4
F-3
Filter Gp - Pump Case Drain 337-4102
5
F-3
F-3
67
Pump Gp - Implement 292-8768
8
C-8
9
Breather 258-2829 C-7
1011
D-7Screens - Return 9T-9227 C-7,8
1213
Tank Gp - Hydraulic Oil 340-5659
15
C-7
Valve Gp - Backpressure 353-7179
14
E-7
Valve Gp - Relief (Auxiliary Function) 272-2334 E-1
16
Valve Gp - Relief (Make-Up - Lift) 234-4869 E-3
17
Valve Gp - Relief (Margin) 328-0730 E-1
18
Valve Gp - Relief (Ride Control) 4T-7581 E-2
F-1
Valve Gp - 2 Function w/o Ride Control
3 Function w/ Ride Control (Atch)3 Function w/o Ride Control (Atch)
261-39452 Function w/ Ride Control (Atch) 261-2337
261-3972261-2338
3 Function w/ Ride Control (Logger Atch) 256-3644
Valve Gp - Shuttle 235-6157 E-2
21
Valve Gp - Solenoid (Anti-Drift) 328-4314
2627
E-3Valve Gp - Solenoid (Pressure Reducing) 335-1074
28
E-1Valve Gp - Solenoid (Pressure Reducing) 313-7668 E-1
Valve Gp - Dead Engine Lower 112-181722
E-7
Cylinder Gp - Steering (CCS Atch) 314-9336
23
B-5
Cylinder Gp - Steering HMU 314-9336 C-1Neutralizer - HMU 296-5662 C-3Neutralizer - (CCS Atch) 321-5283 A,B-6Orifice 108-2144 B-3
Pump Gp - Steering 241-9157
141-2597154-2883
24
D-6Pump Gp - Secondary Steering Pump/Motor (Atch) 275-8544
25
C-7Pump Gp - HMU Metering 349-6093 B-3
Valve Gp - Check (CCS Atch) 111-7775 B-6C-7B-5
A-6
Screen - (Atch)Valve Gp - Check
29
Valve Gp - Pressure Reducing (Atch)Valve Gp - Pilot (CCS Atch)
114-1267164-4116
30
A-5
Valve Gp - Shuttle (Atch) 8J-6875
31
Valve - Manual Pump Case Fill 8T-6907 C-7,8
A-6Valve Gp - Steering: Backup Relief 132-5258
32
C-2Valve Gp - Steering (CCS Atch) 133-1728 B-5
Cooler - Hydraulic Oil 244-4498
33
D-8
Actuator - Parking Brake 154-8042 F-6
Filter Gp - Kidney Loop 330-9358
34
D-8
35
Motor Gp - Fan 161-8919
36
D-8Motor Gp - Fan (Atch) 334-6234 D-8Pump Gp - Fan 254-5147
37
D-8Valve Gp - Charge (Fan Drive and Brake) 352-1587
38
E-8Valve Gp - Check (Filter Anti-Drainback) 307-5393
39
D-8Valve Gp - Cooler Bypass Check 244-1426
40
D-8
Valve Gp - Park Brake 106-1774
41
F-6Valve Gp - Foot Brake 210-5587 F-7
4243444546
47
Valve Gp - Diverter (Atch) 237-8180
48
C-8
Cylinder Gp - Quick Coupler (Atch) 311-1463
49Valve Gp - Steering: Cross-Over Relief 129-8222 C-1
F-5
65
Valve Gp - Quick Coupler (Atch) 180-8585
50
E-5
51
Valve Gp - Sampling Port 8C-3451 D-8
Accumulator - Brake 198-9841 E-7,85253
Breaker - Vaccum 220-0814 C-754
Component Locations
Quick Coupler (Attachment)
Axle Cooler System
Implement System
Steering System
Fan / Brake System
356-2220
Valve Gp - Relief (Load Sense) 346-0474 E-3
19
Valve Gp - Relief (Tilt) 332-1985 F-3
20
Valve Gp - Relief (Tilt - Logger Atch) 332-1986 F-3
555657585960
61
Pump Gp - Transmission 241-8686 D-7Miscellaneous
626364
6768
66
Valve Gp - Steering: HMU 142-3996 C-2
69
SAMPLING PORT LOCATION TABLE
TapNumber Description Schematic
Location8-FerusserP ekarB tnorF B8-BerusserP ekarB raeRC6-FerusserP ekarB kraP D8-EBrake Accumulator Pressure 1G4-EImplement Pump Discharge Pressure 2G
G3 D-7G4 D-7Steering Pump Discharge Pressure
3-BSteering Pump Load Sense Pressure 5G7-DFan Pump Discharge Pressure6G8-DFan Pump Load Sense Pressure 7G
G8 A-7G9 B-5
Tap LocationPressure and Sampling
Implement Pump Load Sense Pressure
CCS Steering Neutral Pilot PressureCCS Steering Left Pilot PressureCCS Steering Right Pilot Pressure 1-EG10
6-ACase Drain Air Bleed
G11G12 D-8
8-DtroP gnilpmaS diulFSOS
CCS Steering Resolved Pilot Pressure
FLUID POWER SYMBOLS
ONE POSITION TWO POSITION THREE POSITION
VENTED PRESSURIZED RETURN ABOVE FLUID LEVEL RETURN BELOW FLUID LEVEL
LINES CROSSING LINES JOINING
TWO-WAY THREE-WAY FOUR-WAY
SPRING CONTROL VALVES RESTRICTION LINE RESTRICTION(FIXED)
2-SECTION PUMP
MAIN AUX.
SPRING(ADJUSTABLE)
VARIABILITY LINE RESTRICTION(VARIABLE)
LINE RESTRICTIONVARIABLE and PRESSURE
COMPENSATED
PRESSURECOMPENSATION
PUMP: VARIABLE andPRESSURE COMPENSATED
ENERGY TRIANGLESHYDRAULIC PNEUMATIC
MEASUREMENT
PRESSURE TEMPERATURE FLOW
ROTATING SHAFTS
UNIDIRECTIONAL BIDIRECTIONAL
PUSH-PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING
MANUAL CONTROL SYMBOLS
HYDRAULIC MOTORS
FIXEDDISPLACEMENT
VARIABLE DISPLACEMENTNON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
HYDRAULIC PUMPS
FLUID STORAGE RESERVOIRS
CROSSING AND JOINING LINES
VALVE ENVELOPES VALVE PORTS
BASIC COMPONENT SYMBOLS
FLUID CONDITIONERPUMP or MOTOR
FIXEDDISPLACEMENT
VARIABLE DISPLACEMENTNON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
VALVES
PILOT CONTROL SYMBOLSRELEASED PRESSURE
EXTERNAL RETURN INTERNAL RETURN
REMOTE SUPPLY PRESSURE
SIMPLIFIED COMPLETE INTERNALSUPPLY PRESSURE
ACCUMULATORS
SPRING LOADED GAS CHARGED
SOLENOIDor MANUAL
SOLENOIDand PILOT
SOLENOID and PILOT or MANUAL
COMBINATION CONTROLS
SOLENOID SERVO THERMAL DETENT
HYDRAULIC AND PNEUMATIC CYLINDERS
DOUBLE ACTINGSINGLE ACTING
BASICSYMBOL
SPRINGLOADED
CHECK VALVES
TWOPOSITION
INFINITEPOSITIONING
FLOW IN ONEDIRECTION
FLOW ALLOWED INEITHER DIRECTION
THREEPOSITION
CROSSFLOW
PARALLELFLOW
INTERNAL PASSAGEWAYS
NORMAL POSITION
A B
P T
A B
P TSHIFTED POSITION INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOTCONTROLLED
ELECTRICAL SYMBOLSHydraulic Symbols (Electrical)
325-AG135 PK-14
Circuit IdentificationNumber
Wire Color Wire Gauge
Harness identification codeThis example indicateswire 135 in harness "AG".
325-PK-14
Wire Gauge
Wire Color
Circuit Number Identification
Wire Number Identification Codes
Current Standard
Previous Standard
Electrical Schematic Example Hydraulic Schematic Example
325-PK
Wire ColorCircuit Number Identification
B A
Wire
Wire
(EXAMPLE VALVE)
Current Standard
Transducer(Fluid)
Transducer(Gas / Air)
G
Generator
Electrical WirePressure Switch
MElectric Motor
Pressure Switch (Adjustable)
Temperature Switch
PressureSymbol
TemperatureSymbol
LevelSymbol
FlowSymbol
Electrical Symbols (Electrical)
T
Components are shown installed on a fully operable machine with the key and engine off, transmission shifterin neutral and with parking brake set.Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
SCHEMATIC PART NUMBER: 242-0337, CHANGE: 10, VERSION: -MEDIA NUMBER: RENR8828-04THIS SCHEMATIC IS FOR THE 966H AND 972H WHEEL LOADER HYDRAULIC SYSTEM
12345678
A
B
C
D
E
F
12345678
A
B
C
D
E
F
HYDRAULIC CIRCUIT COLOR DESCRIPTIONSIMPLEMENT PILOT SUPPLY OIL
BRAKE COOLING CIRCUIT
IMPLEMENT PUMP OUTPUTTRANSMISSION PUMPPRIMARY STEERING PUMP CIRCUITIMPLEMENT PUMP LOAD SENSE CIRCUITSTEERING CIRCUITFAN PUMP CIRCUITSUPPLY LINEQUICK COUPLER CIRCUITBRAKE CONTROL CIRCUITAUXILIARY CIRCUITMAIN RELIEF VALVE LOAD SENSING CIRCUITDRAIN / RETURN LINETILT CYLINDER CIRCUITLIFT CYLINDER CIRCUITSECONDARY STEERING CIRCUIT
ELECTRICAL CIRCUITS
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
CALLOUTS
Taps (Pressure, Sampling, Sensor - by letter)YY
(52) VALVE GP - CONTROL138-1234
Callout Number(Machine Location from
Component LocationsTable)
ComponentName
Part Number
HMU
PA
PB
T
B
A
P
L R
PT
LS
LS P T
PS
A1 A2
E1
F
IMPLEMENT PUMP DISCHARGE
IMPLEMENT LOAD SENSE SIGNAL
IMPLEMENT LOAD SENSE RELIEF/PILOT RETURN
QUICK COUPLER SUPPLY
IMPLEMENT RETURN
AXLE OIL COOLER RETURN
AXLE OIL COOLER SUPPLY
B
SL
X
M
LS
REAR AXLE
P T
T
P
LS
PA
PB
B A
PORT A LEVER REARWARD,LEFT HAND LINE ON BOOM(WHEN VIEWED FROM CAB)
PORT B LEVER FORWARD, RIGHT HAND LINE ON BOOM(WHEN VIEWED FROM CAB)
RACKBACK
DUMP
HOLD
DUMP
RAISE
LOWER/FLOAT
RAISE
HOLD
LOWER
FLOAT
HOLD
PORTA
PORTB
PORTA
PORTB
E5
E6
E4
RACKBACK
E2
E3
E7
E8
E9
E10
E11
E12E13
B1A1 A2 B2 A3 B3 A4B4
PRIMARY PILOT SUPPLY - CCS STEERING ATTACHMENT
FRONT AXLE
E14
T
P
P
LS
LS
P
T
T
NC
NO
CC
TO TRANSMISSION CONTROL
TO BRAKELIGHTS
APPLYRELEASE
AXLE
RESERVIOR
RESERVIOR
AXLE
TRANSMISSION CONTROL
C
NONC
LS
COMMAND CONTROL STEERING (ATTACHMENT)
HMU STEERING (STANDARD CONFIGURATION)
(63) VALVE GPOUTPUT
PRESSURE210-5587
(64) VALVE GPPARK BRAKE
106-1774 (53) ACTUATOR ASPARK BRAKE154-8042
(67) CYLINDER GPQUICK COUPLER
311-1463
(68) VALVE GPQUICK COUPLER180-8585
(21) VALVE GPMANUAL LOWER112-1817
TILT CYLINDER(6) 966 STANDARD 356-2219(7) 972 STANDARD 356-2220(8) 966 HIGH LIFT 358-5189(9) 972 HIGH LIFT 358-5190(10) 966 LOGGER 356-2220
(4) CYLINDER GPLIFT - (LH)
242-4274
(5) CYLINDER GPLIFT - (RH)242-4275
(2) ACCUMULATORRIDE CONTROL325-7131
(1) ACCUMULATORPILOT355-9981
(23) VALVE GPLOAD SENSERELIEF346-0474
(32) VALVE GPPRESSUREREDUCING313-7668
(32) VALVE GPPRESSUREREDUCING313-7668
(32) VALVE GPPRESSUREREDUCING313-7668
(25) VALVE GPMARGINRELIEF328-0730
(35) CYLINDER GPSTEERING314-9336
(50) VALVE GPSTEERINGCROSSOVER RELIEF129-8222
(48) VALVE GPSTEERING
BACKUP RELIEF132-5258
(51) VALVE GPSTEERING (HMU)
142-3996
(11) FILTER GPCASE DRAIN337-4102
(3) BREATHER258-2829
(14) TANK GPHYDRAULIC340-5959
(54) BREAKERVACUUM220-0814
(33) VALVE - MANUALPUMP CASE FILL8T-6907
(13) SCREEN - RETURN 9T-9227
(66) VALVE GPDIVERTER237-8180
(56) FILTER GPKIDNEY LOOP330-9358
(61) VALVE GPCHECK (FILTERANTIDRAINBACK)307-5393
(55) COOLERHYDRAULIC OIL244-4498
(59) PUMP GPFAN
254-5147
(62) VALVE GPCHECK(COOLERBYPASS)244-1426
(65) VALVE GPSAMPLING PORT8C-3451
(57) 161-8919(58) 334-6234 (ATCH)
MOTOR GP - FAN
(60) VALVE GPCHARGE (FANDRIVE ANDBRAKE)352-1587
(52) ACCUMULATORBRAKE
198-9841
(21) VALVE GP - LOWER(DEAD ENGINE)
112-1817
(20) VALVE GPBACKPRESSURE
353-7179
(12) VALVE GPIMPLEMENT
292-8768
(69) PUMP GPTARNSMISSION
241-8686
(41) PUMP GPSTEERING241-9157
(43) VALVE GPCHECK
141-2597
(40) PUMP GPSECONDARYSTEERING (ATCH)275-8544
(47) VALVE GPSHUTTLE (ATCH)8J-6875
(45) VALVE GPPILOT (CSS ATCH)
164-4116
(44) VALVE GPCHECK
(CSS ATCH)111-7775
(37) NEUTRALIZERCCS (ATCH)321-5283
(42) SCREEN (ATCH)154-2883
(50) VALVE GP - STEERINGCROSSOVER RELIEF
111-7775
(46) VALVE GP - PRESSUREREDUCING (ATCH)
114-1267
(48) VALVE GP - RELIEFSTEERING BACKUP
132-5258
(49) VALVE GP - STEERING(CCS ATCH)133-1728
(34) CYLINDER GPSTEERING314-9336
(39) PUMP GPHMU METERING349-6093
(38) ORIFICE108-2144
(36) NEUTRALIZERHMU296-5662
(22) VALVE GP - RELIEF(AUX FUNCTION)272-2334
IMPLEMENT VALVE GP(15) 2 FUNCTION W/O RIDE CONTROL 261-3945(16) 2 FUNCTION W/ RIDE CONTROL (ATCH) 261-2337(17) 3 FUNCTION W/O RIDE CONTROL (ATCH) 261-3972(18) 3 FUNCTION W/ RIDE CONTROL (ATCH) 261-3338(19) 3 FUNCTION W/ RIDE CONTROL (LOGGER ATCH) 256-3644
(31) VALVE GPPRESSUREREDUCING335-1074
(32) VALVE GPSOLENOID(PRESSUREREDUCING)313-7668
(32) VALVE GPSOLENOID
(PRESSUREREDUCING)
313-7668
(32) VALVE GPSOLENOID(PRESSUREREDUCING)313-7668 (26) VALVE GP - RELIEF
(RIDE CONTROL)4T-7581
(29) VALVE GP - SHUTTLE235-6157
(30) VALVE GPSOLENOID
(ANTI-DRIFT)328-4314
(30) VALVE GPSOLENOID
(ANTI-DRIFT)328-4314
(30) VALVE GPSOLENOID
(ANTI-DRIFT)328-4314
(27) VALVE GPRELIEF (TILT)
332-1985
(28) VALVE GPRELIEF
(LOGGER ATCH)332-1985
(24) VALVE GPRELIEF
(MAKE UP LIFT)234-4869
G12
SOS
G7 G6G3
G4
G2
G10
G5G5
G1
G8G11
G9G10
SOLENOID VALVE REFERENCESOLENOID LOCATION SOLENOID NAME
E1 FAN / BRAKE VALVE DEMAND SPEED FAN SOLENOIDE2 IMPLEMENT VALVE - LIFT LOWER SOLENOIDE3 IMPLEMENT VALVE - LIFT RAISE SOLENOIDE4 IMPLEMENT VALVE - RIDE CONTROL RIDE CONTROL BALANCE SOLENOIDE5 IMPLEMENT VALVE - RIDE CONTROL RIDE CONTROL HEAD END CHECK SOLENOIDE6 IMPLEMENT VALVE - RIDE CONTROL RIDE CONTROL ROD END CHECK SOLENOIDE7 IMPLEMENT VALVE - TILT DUMP SOLENOIDE8 IMPLEMENT VALVE - TILT RACK BACK SOLENOIDE9 IMPLEMENT VALVE IMPLEMENT PILOT SUPPORT SOLENOIDE10 IMPLEMENT VALVE - 3RD FUNCTION 3RD FUNCTION PORT A SOLENOIDE11 IMPLEMENT VALVE - 3RD FUNCTION 3RD FUNCTION PORT B SOLENOIDE12 IMPLEMENT VALVE - LIFT LOWER ANTI-DRIFT SOLENOIDE13 IMPLEMENT VALVE - TILT DUMP ANTI-DRIFT SOLENOIDE14 QUICK COUPLER VALVE ENABLE SOLENOID
DB
C
LEFT SIDE REAR VIEW
62
60
5958
54
43
40
20
LEFT SIDE FRONT VIEW (HMU)
68
64
53
3836
35
32
31 30
29
2725
23
22
1918
1716
15
109876
5
2
1
LEFT SIDE FRONT VIEW (CCS)
G11 D
6853
504946
45
44
42
37
35
1918171615
109876
5
2
RIGHT REAR VIEW
G12
G7G6
69
65
6461
60
59
57
56
55
52
51
41
34
3314
13
12 11
3
RIGHT SIDE FRONT VIEW (HMU)
G10G5
G3G2
68
67
63
51
39
36
32
30
28
2624
22
21
1918171615
109876
4
2
RIGHT SIDE VIEW (CCS)
SOS
G9G8
G4 G1C B
66 48
47