RENR2117-02
January 2009
Volume 1 of 2: Brakes, Pilot Implements, and HMU Steering
966G and 972G Wheel Loader
Hydraulic System
966G:
AAH1-UP
3ZS1-UP
9RS1-UP
3PW1-UP
3SW1-UP
8XW1-UP
972G:
7LS1-UP
AAW1-UP
1EW1-UP
4WW1-UP
6AW1-UP
9GW1-UP
Printed in U.S.A.© 2009 Caterpillar, All Rights Reserved
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)
PUMP
(2 - SECTION)
SPRING
(ADJUSTABLE)
VARIABILITY LINE RESTRICTION
(VARIABLE)
PRESSURE
COMPENSATION
PUMP
(VARIABLE & PRESSURE
COMPENSATED)
MEASUREMENT
PRESSURE TEMPERATURE FLOW
ROTATING SHAFTS
UNIDIRECTIONAL BIDIRECTIONAL
PUSH - PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
VALVE ENVELOPES VALVE PORTS
FLUID CONDITIONERPUMP OR MOTOR
FLUID POWER SYMBOLS
UNIDIRECTIONAL
BIDIRECTIONAL
RELEASED PRESSURE
EXTERNAL RETURN INTERNAL RETURN
REMOTE SUPPLY PRESSURE
SIMPLIFIED
HYDRAULIC PUMPS
ACCUMULATORS
SPRING LOADED GAS CHARGED
SOLENOID
OR MANUAL
SOLENOID
& PILOT
SOLENOID &
PILOT OR MANUAL
SOLENOID SERVO THERMAL DETENT
HYDRAULIC & PNEUMATIC CYLINDERS
DOUBLE ACTINGSINGLE ACTING
BASIC
SYMBOL
SPRING
LOADED
CHECK VALVES
2 POSITION
INFINITE
POSITIONING
FLOW IN ONE
DIRECTION
FLOW IN
EITHER
DIRECTION
3 POSITION
CROSS
FLOW
PARALLEL
FLOW
INTERNAL PASSAGEWAYS
NORMAL POSITION
AB
PT
AB
PT
SHIFTED POSITION INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOT
CONTROLLED
MAIN AUX
LINE RESTRICTION
(VARIABLE & PRESSURE
COMPENSATED)
MANUAL CONTROL SYMBOLS
HYDRAULIC MOTORS
FLUID STORAGE RESERVOIRS
CROSSING & JOINING LINES
VALVES
PILOT CONTROL SYMBOLS
COMBINATION CONTROLS
BASIC COMPONENT SYMBOLS
ENERGY TRIANGLES
HYDRAULIC PNEUMATIC
INTERNAL
SUPPLY PRESSURE
COMPLETE
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
HYDRAULIC SYMBOLS (ELECTRICAL)
ELECTRICAL SYMBOLS TABLE
325-AG135 PK-14
HARNESS IDENTIFICATION CODE THIS EXAMPLE
INDICATES WIRE 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 COLOR
CIRCUIT NUMBER
IDENTIFICATION
B
WIRE
WIRE
(EXAMPLE VALVE)
CURRENT STANDARD
TRANSDUCER
(FLUID)
M
ELECTRIC MOTORTRANSDUCER
(GAS / AIR)
G
GENERATOR
PRESSURE SWITCH ELECTRICAL WIREPRESSURE SWITCH
(ADJUSTABLE)
TEMPERATURE
SWITCH
PRESSURE
SWITCH
TEMPERATURE
SWITCH
LEVEL
SWITCH
FLOW
SWITCH
ELECTRICAL SYMBOLS (ELECTRICAL)
A
CIRCUIT NUMBER
IDENTIFICATION
WIRE
COLOR
WIRE GAUGE
T
RENR2117-02 VOL 1 of 2
24 Page, (Dimensions: 34 inches x 28 inches)
27
14
25
2
3431
32
33
GG
957
6
51
52
59
53
54
37
8
CC
DD
MM
16
37
8
HH
50
11
FF
57
5855
56
29
3021
20
JJ
35
18
15
16
LL
361724
3
13
194
6
11
59
16
50
BB
DD
MM
AA
5451
52
53
27
14
25
2
3431
32
3328
28
9
5
7
GG
51378
HH
21
20
JJ
36
KK
24
3
13 17
LL
15
35 18 57
5855
56
29
28
COMPONENT LOCATIONS
DD
50
FF
55
CC
KK
MM
17
Tap Locations
Pressure and Sampling
Tap
Number
Description
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
STEERING PUMP
Component Locations
Description
Part
Number
Machine
Location
Schematic
Location
Description
Connector - Orifice 128-7063 1 D-4 to D-5 Valve Gp - Pilot
Accumulator As - Ride Control 108-5933 2 F-4 Valve Gp - Pilot, Shut Off
Cooler 130-8842 3 B-5
Valve Gp - Pilot (Oil Manifold, 2 Funct.)
Pilot (Oil Manifold, 3 Funct.)
Cooler As - Brake Oil Cooling Attachment 134-2454 4 A-6
Cylinder Gp - Auxiliary 5 F-6 Valve Gp - Relief (Line, Aux, HE)
Cylinder Gp - Lift (LH) 133-2964 6 F-4 Valve Gp - Relief (Line, Aux, RE)
Cylinder Gp - Lift (RH) 133-2963 7 F-4
Valve Gp - Relief (Line,Tilt, RE, HE)
Standard 2 And 3 Valve
Relief (Line, Tilt, RE), Logging
Relief (Line,Tilt, HE), Logging
Cylinder Gp - Steering 133-1747 8 C-2
Cylinder Gp - Tilt, 966
972
144-9005
133-2962
9 F-5
Elbow - Orifice 108-2144 10 B-4
Valve Gp - Relief, Main Standard
Logging
Filter Gp - Oil, Hydr. (Fan / Cooler Flow) 134-3016 11 B-6
Manifold Gp - (Lift, Standard) 130-2073 12 E-4 Valve Gp - Secondary Steering (Diverter)
Motor Gp - Hydraulic Fan 161-8919 13 B-5 Valve Gp - Steering
Plate - Orifice 8V-2080 14 F -5 Valve Gp - Steering Neutralizer
Pump and Motor Gp - Sec. Steering 154-2563 15 A-5
BRAKES
Pump Gp - HMU 147-7343 16 B-4 Accumulator Gp - Brake (Charged)
Pump Gp - Hydraulic Fan 162-0772 17 B-6 Actuator As - Parking Brake
Pump Gp - Steering
Implement
Pilot / Brake
167-1154 18 B-7
Control Gp - Foot Brake
Sensor Gp - Position (Rotary, Lft Brk Pdl)
Switch As - Limit (Stop Light)
Screen Gp 6E-5065 19 A-7 Switch As - Pressure (Parking Brakes)
Tank Gp - Hydraulic 133-1843 20 A-6 to A-7 Switch As - Pressure (Low Pressure Warning)
Valve - Breaker Relief 9T-0818 21 A-7 Valve Gp - Accumulator
Valve Gp - Check (Air Purge)(Air Bleed) 3G-8607 22 Valve Gp - Brake Control (Parking)
Valve Gp - Check (Ride Control) 9T-3096 23 E-4 Valve Gp - Brake Control (Service)
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
Valve Gp - Main Control,
2 Func., Standard
3 Func. Logging
3 Func., (Attch)
Control,
1 Func., Field Conversion
120-7477
120-7475
120-7473
120-7611
27 E-4 to E-7
Part
Number
Machine
Location
Schematic
Location
144-0115 28
112-1817 29 D-5
152-6480
152-6481
30 D-4 to D-5
4T-2742 31 E-7
4T-4162 32 F-6
6E-2377
9T-8488
4T-2764
33 F-5
6E-6003
6E-6185
34 E-7
141-2597 35
142-3996 36 B-2 to B-3
146-7571 37 C-4
198-9841 50 F-2
154-8042 51 F-1
193-1448 52 F-2
214-4863 53 F-3
105-6117 54 F-3
3E-6452 55 E-1
3E-7693 56 D-3
229-9984 57 E-3
106-1774 58 D-1
210-5587 59 F-2
FRONT, RIGHT VIEW OF HITCH
SERVICE BRAKES ACCUM CHARGING VALVE SERVICE BRAKES CONTROL VALVE
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Attachment
Air Line
CALLOUTS
Taps (Pressure, Sampling, Sensor - by letter)
Components (By number)
YY
52
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
PILOT / BRAKE PUMP OUTPUT
IMPLEMENT PUMP OUTPUT
TILT CONTROL CIRCUIT
STEERING CIRCUIT
FAN PUMP AND CIRCUIT
SUPPLY LINE
BRAKE CONTROL CIRCUIT
AUXILIARY CONTROL CIRCUIT
DRAIN / RETURN LINE
LIFT CONTROL CIRCUIT
ELECTRICAL WIRES
SECONDARY STEERING PUMP CIRCUIT
RENR2117-02 VOL 1 of 2
24 Page, (Dimensions: 34 inches x 28 inches)
THIS SCHEMATIC IS FOR THE 966G AND 972G WHEEL LOADER HYDRAULIC SYSTEM
MEDIA NUMBER: RENR2117-02, VOLUME 1 OF 2
PART NUMBER: 133-1727, CHANGE: 03, VERSION: - (STEERING AND IMPLEMENTS)
PART NUMBER: 142-0727, CHANGE 04, VERSION: - (BRAKES)
Components are shown installed on a fully operable machine.
Refer to the appropriate Service Manual for Troubleshooting, Specifications.
A
B
C
D
E
F
1234567
A
B
C
D
E
F
1234567
M
PILOT IMPLEMENTS / HMU STEERING
E9
E8
AA
BB
HH
JJ
LL
MM
KK
FF
CC
DD
GG
IMPLEMENT
STEER
PILOT/BRAKE
TO HYD BRAKE DRAIN
TO HYD BRAKES
VENT
TO BRAKE
LIGHTS
TO TRANSMISSION
CONTROL
TO HYDRAULIC
OIL FILTER
TO SEMS
TRANSMISSION
CONTROL
RELEASE
APPLY
FROM DEMAND
FAN
NC
NO
CC
NC
NO
C
RAISE
LOWER
RACK BACK
DUMP
LOWER CLOSE
OPEN RAISE
ACCUMULATOR AS.
RIDE CONTROL
108-5933
CONNECTOR
ORIFICE
128-7063
CONNECTOR
ORIFICE
128-7063
COOLER AS
BRAKE OIL
COOLING
ATTCH
134-2454
COOLER AS
BRAKE OIL
COOLING
ATTCH
134-2454
CYLINDER GP
LIFT (LH)
133-2964
CYLINDER GP
LIFT (RH)
133-2963
CYLINDER GP
TILT
966: 144-9005
972: 133-2962
CYLINDER GP
AUXILIARY
FILTER GP
OIL, HYDR.
FAN / COOLER FLOW
134-3016
MANIFOLD GP
LIFT, STANDARD
130-2073
MOTOR GP
HYDRAULIC FAN
161-8919
PUMP GP
STEERING
IMPLEMENT
PILOT / BRAKE
167-1154
PUMP AND MOTOR GP
SECONDARY STEERING
154-2563
SCREEN GP
6E-5065
VALVE GP
CHECK
AIR PURGE, AIR BLEED
3G-8607
VALVE GP
MAIN CONTROL
2 FUNCTION, STANDARD: 120-7477
3 FUNCTION, LOGGING: 120-7475
3 FUNCTION, ATTACHMENT: 120-7473
1 FUNCTION, FIELD CONVERSION: 120-7611
VALVE GP
COOLER BYPASS
9T-6005
VALVE GP
SEC. STEERING
DIVERTER
141-2597
VALVE GP
DIVERTER
RIDE CONTROL
137-3520
VALVE GP
FLOW DIVIDER
AXLE OIL CLR
133-1729
VALVE GP
PILOT
OIL MANIFOLD
2 FUNCTION: 152-6480
3 FUNCTION: 152-6481
VALVE GP
RELIEF
LINE, AUX,
HEAD END
4T-2742
VALVE GP
RELIEF
LINE, AUX,
ROD END
4T-4162
VALVE GP
RELIEF
MAIN, STANDARD: 6E-6003
LOGGING: 6E-6185
VALVE GP
RELIEF
LINE, TILT,
HEAD END
STANDARD 2 OR 3
VALVE: 6E-2377
LOGGING: 4T-2764
VALVE GP
RELIEF
LINE, TILT,
ROD END
STANDARD 2 OR 3
VALVE: 6E-2377
LOGGING: 9T-8488
ACCUMULATOR AS.
BRAKE (CHARGED)
198-9841
ACTUATOR AS.
PARKING BRAKE
154-8042
CONTROL GP
FOOT BRAKE
193-1448
SENSOR GP
POSITION
(ROTARY, LFT BRK PDL)
214-4863
SWITCH AS
LIMIT
STOP LIGHT
105-6117
SWITCH AS
PRESSURE
PARKING BRAKES
3E-6452
VALVE GP
ACCUMULATOR
229-9984
VALVE GP
BRAKE CONTROL
PARKING
106-1774
VALVE GP
BRAKE CONTROL
SERVICE
210-5587
BRAKES, PARKING AND SERVICE
PLATE
ORIFICE
8V-2080
VALVE GP
CHECK
RIDE CONTROL
9T-3096
CONNECTOR
ORIFICE
128-7063
CONNECTOR
ORIFICE
128-7063
CONNECTOR
ORIFICE
128-7063
CONNECTOR
ORIFICE
128-7063
VALVE GP
PILOT
SHUT OFF
112-1817
VALVE GP
PILOT
144-0115
COOLER
130-8842
PUMP GP
HYDRAULIC FAN
162-0770
TANK GP
HYDRAULIC
133-1843
VALVE
BREAKER RELIEF
9T-0818
FRONT BRAKES
REAR BRAKES
SWITCH AS
PRESSURE
LOW PRESSURE WARNING
3E-7693
VALVE GP
STEERING
NEUTRALIZER
146-7571
VALVE GP
STEERING
NEUTRALIZER
146-7571
ELBOW
ORIFICE
108-2144
ELBOW
ORIFICE
108-2144
PUMP GP
HMU
147-7343
VALVE GP
STEERING
142-3996
CYLINDER GP
STEERING
133-1747
BACK-UP
RELIEF
MAKE-UP
CHECK
CROSSOVER RELIEF
PILOT CONTROL SPOOL
DIRECTIONAL SPOOL
RENR2117-02
January 2009
Volume 2 of 2: Brakes, E/H Implements, and Command Control Steering
966G and 972G Wheel Loader
Hydraulic System
966G:
AAH1-UP
3ZS1-UP
9RS1-UP
3PW1-UP
3SW1-UP
8XW1-UP
972G:
7LS1-UP
AAW1-UP
1EW1-UP
4WW1-UP
6AW1-UP
9GW1-UP
Printed in U.S.A.© 2009 Caterpillar, All Rights Reserved
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)
PUMP
(2 - SECTION)
SPRING
(ADJUSTABLE)
VARIABILITY LINE RESTRICTION
(VARIABLE)
PRESSURE
COMPENSATION
PUMP
(VARIABLE & PRESSURE
COMPENSATED)
MEASUREMENT
PRESSURE TEMPERATURE FLOW
ROTATING SHAFTS
UNIDIRECTIONAL BIDIRECTIONAL
PUSH - PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
VALVE ENVELOPES VALVE PORTS
FLUID CONDITIONERPUMP OR MOTOR
FLUID POWER SYMBOLS
UNIDIRECTIONAL
BIDIRECTIONAL
RELEASED PRESSURE
EXTERNAL RETURN INTERNAL RETURN
REMOTE SUPPLY PRESSURE
SIMPLIFIED
HYDRAULIC PUMPS
ACCUMULATORS
SPRING LOADED GAS CHARGED
SOLENOID
OR MANUAL
SOLENOID
& PILOT
SOLENOID &
PILOT OR MANUAL
SOLENOID SERVO THERMAL DETENT
HYDRAULIC & PNEUMATIC CYLINDERS
DOUBLE ACTINGSINGLE ACTING
BASIC
SYMBOL
SPRING
LOADED
CHECK VALVES
2 POSITION
INFINITE
POSITIONING
FLOW IN ONE
DIRECTION
FLOW IN
EITHER
DIRECTION
3 POSITION
CROSS
FLOW
PARALLEL
FLOW
INTERNAL PASSAGEWAYS
NORMAL POSITION
AB
PT
AB
PT
SHIFTED POSITION INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOT
CONTROLLED
MAIN AUX
LINE RESTRICTION
(VARIABLE & PRESSURE
COMPENSATED)
MANUAL CONTROL SYMBOLS
HYDRAULIC MOTORS
FLUID STORAGE RESERVOIRS
CROSSING & JOINING LINES
VALVES
PILOT CONTROL SYMBOLS
COMBINATION CONTROLS
BASIC COMPONENT SYMBOLS
ENERGY TRIANGLES
HYDRAULIC PNEUMATIC
INTERNAL
SUPPLY PRESSURE
COMPLETE
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
HYDRAULIC SYMBOLS (ELECTRICAL)
ELECTRICAL SYMBOLS TABLE
325-AG135 PK-14
HARNESS IDENTIFICATION CODE THIS EXAMPLE
INDICATES WIRE 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 COLOR
CIRCUIT NUMBER
IDENTIFICATION
B
WIRE
WIRE
(EXAMPLE VALVE)
CURRENT STANDARD
TRANSDUCER
(FLUID)
M
ELECTRIC MOTORTRANSDUCER
(GAS / AIR)
G
GENERATOR
PRESSURE SWITCH ELECTRICAL WIREPRESSURE SWITCH
(ADJUSTABLE)
TEMPERATURE
SWITCH
PRESSURE
SWITCH
TEMPERATURE
SWITCH
LEVEL
SWITCH
FLOW
SWITCH
ELECTRICAL SYMBOLS (ELECTRICAL)
A
CIRCUIT NUMBER
IDENTIFICATION
WIRE
COLOR
WIRE GAUGE
T
RENR2117-02 VOL 2 of 2
24 Page, (Dimensions: 34 inches x 28 inches)
1
15
29
26 34
38
36
35
EE
81110
6
2352
59
53
54
31
7
CC
DD
20
7
NN
50
12
MM
57
5855
56
28
17
19
42
TT
30
1627
4
12 59
31
20
BB
CC
DD
AA
54
51
52
53
1
15
29
26
34
38
36
35
37
37
911
6
GG
517
NN
21
20
RR
17
27
4
14 16
TT
28
18
19
57
58
55
56
COMPONENT LOCATIONS
Component Locations
Description
Part
Number
Machine
Location
Schematic
Location
Description
Accumulator As - Ride Control 108-5933 1 F-4 Valve Gp - Cooler Bypass
Connector 8C-0564 2 E-5 Valve Gp - Secondary Steering (Diverter)
Connector - Orifice 128-7063 3 D-6 Valve Gp - Diverter (Ride Control)
Cooler 130-8842 4 B-5 Valve Gp - Flow Divider (Axle Oil Cooler)
Cooler As - Brake Oil Cooling Attachment 134-2454 5 A-6 Valve Gp - Steering Neutralizer
Cylinder Gp - Lift (LH) 133-2964 6 F-5 Valve Gp - Pilot (Command Control Steering)
Cylinder Gp - Steering 133-1747 7 C-2
Valve Gp - Pilot (Oil Manifold, 2 Funct.)
Pilot (Oil Manifold, 3 Funct.)
Cylinder - Tilt (966) 144-9005 8 F-6
Cylinder - Tilt (972) 133-2962 9 F-6 Valve Gp - Relief (Line, Aux, HE)
Cylinder - Lift (RH) 133-2963 10 F-4 Valve Gp - Relief (Line, Aux, RE)
Cylinder Gp - Auxiliary 11 F-6
Valve Gp - Relief, Main Standard
Logging
Filter Gp - Oil, Hydr. (Fan / Cooler Flow) 134-3016 12 B-6
Manifold Gp - (Lift, Standard) 130-2073 13 E-4 Valve Gp - Relief (Line,Tilt, HE), Logging
Motor Gp - Hydraulic Fan 161-8919 14 B-6
Valve Gp - Relief (Line,Tilt, RE, HE)
Standard 2 And 3 Valve
Plate - Orifice 8V-2080 15 F -5
Pump Gp - Hydraulic Fan 162-0772 16 B-6 Valve Gp - Relief (Line, Tilt, RE), Logging
Pump Gp - Steering
Implement
Pilot / Brake
167-1154 17 B-7
Valve Gp - Shuttle (Steering)
Valve Gp - Steering (Command Control Str)
Valve Gp = Ball, Manual (Lowering Control)
Pump and Motor Gp - Sec. Steering 154-2563 18 A-5
Brakes
Screen Gp - Case Drain (Steering Pilot) 154-2883 19 C-3 Accumulator Gp - Brake (Charged)
Screen Gp 6E-5065 20 A-7, D-7 Actuator As - Parking Brake
Tank Gp - Hydraulic 133-1843 21 A-6 to A-7 Control Gp - Foot Brake
Valve - Breaker Relief 9T-0818 22 A-7 Sensor Gp - Position (Rotary, Lft Brk Pdl)
Valve Gp - Check (Steering Quad) 111-7775 23 B-4 Switch As - Limit (Stop Light)
Valve Gp - Check (Ride Control) 9T-3096 24 E-4 Switch As - Pressure (Parking Brakes)
Valve Gp - Check (Air Purge)(Air Bleed) 3G-8607 25 D-7 Switch As - Pressure
Valve Gp - Main Control,
2 Func., Standard
3 Func. Logging
3 Func., (Attch)
Control,
1 Func., Field Conversion
120-7477
120-7475
120-7473
120-7611
26 E-5 to E-7
Valve Gp - Accumulator
Valve Gp - Brake Control (Parking)
Valve Gp - Brake Control (Service)
Part
Number
Machine
Location
Schematic
Location
9T-6005 27 B-5
141-2597 28 B-5
137-3520 29 E-4
133-1729 30 B-6
8J-1553 31 B-3
164-4116 32 B-4
142-3997
142-3998
33 D-4 to D-6
4T-2742 34 E-7
4T-4162 35 F-6
6E-6003
6E-6185
36 E-7
4T-2764 37 F-5
6E-2377 38 F-6
9T-8488 39 F-6
8J-6875 41 B-4
133-1728 42 B-2
112-1817 43 D-7
198-9841 50 F-2
154-8042 51 F-1
193-1448 52 F-2
214-4863 53 F-3
105-6117 54 F-2
3E-6452 55 E-1
3E-7693 56 D-3
229-9984 57 E-3
106-1774 58 D-1
210-5587 59 F-2
9
8
10
39
39
24
24
25
25 33
3313
13
50
32
23
31
42
30
14
41
41
22
21
20
RR
22
43
43
51
3
2
3
2
32
SS
WW FF
GG
HH
JJ
KK
LL
UU
VV
PP
ZZ
WW
MM
PP
ZZ
EE
FF
GG
HH
JJ
KK
LL
UU
VV
SS
WW
Tap Locations
Pressure and Sampling
Tap
Number
Description
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
EE Auxiliary Pilot Pump Pressure E-7
FF Auxiliary Pilot Pump Pressure E-7
GG Tilt Pilot Pump Pressure E-6
HH Tilt Pilot Pump Pressure E-6
JJ Lift Pilot Pump Pressure E-5
KK Lift Pilot Pump Pressure E-5
LL Pilot Pump Pressure E-4
MM Service Brake Accumulator Pressure D-2
NN Implement Pump Pressure C-7
PP Steering Pump Pressure B-7
RR Fluid Sampling Valve B-6
SS Steering Pilot Pump Pressure B-3
TT Fan Drive Pump Pressure B-6
UU
Steering Control Valve
Neutral Pilot Pressure
B-4
VV Steering Pilot Pressure B-4
WW Steering Pilot Pressure B-3
ZZ Steering Signal Pressure A-3
DD
50
FF
55
CC
PP
ZZ
RIGHT REAR VIEW OF
MAIN STEERING CONTROL VALVE
FRONT, RIGHT VIEW OF HITCH
SERVICE BRAKES ACCUM CHARGING VALVE SERVICE BRAKES CONTROL VALVE
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Attachment
Air Line
CALLOUTS
Taps (Pressure, Sampling, Sensor - by letter)
Components (By number)
YY
52
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
PILOT / BRAKE PUMP OUTPUT
IMPLEMENT PUMP OUTPUT
TILT CONTROL CIRCUIT
STEERING CIRCUIT
FAN PUMP AND CIRCUIT
SUPPLY LINE
BRAKE CONTROL CIRCUIT
AUXILIARY CONTROL CIRCUIT
DRAIN / RETURN LINE
LIFT CONTROL CIRCUIT
ELECTRICAL WIRES
SECONDARY STEERING CIRCUIT
RENR2117-02 VOL 2 of 2
24 Page, (Dimensions: 34 inches x 28 inches)
THIS SCHEMATIC IS FOR THE 966G AND 972G WHEEL LOADER HYDRAULIC SYSTEM
MEDIA NUMBER: RENR2117-02, VOLUME 2 OF 2
PART NUMBER: 133-1727, CHANGE: 03, VERSION: - (STEERING AND IMPLEMENTS)
PART NUMBER: 142-0727, CHANGE 04, VERSION: - (BRAKES)
Components are shown installed on a fully operable machine.
Refer to the appropriate Service Manual for Troubleshooting, Specifications.
A
B
C
D
E
F
1234567
A
B
C
D
E
F
1234567
966G & 972G E/H IMPLEMENT AND
COMMAND CONTROL STEERING
MM
CC
SS
VV
UU
DD
TO BRAKE
LIGHTS
TO TRANSMISSION
CONTROL
NC
NO
CC
NC
NO
C
M
NN
RR
TT
IMPLEMENT
STEER
PILOT/BRAKE
PP
ZZ
WW
TO SEMS
TRANSMISSION
CONTROL
RELEASE
APPLY
TO HYD BRAKE DRAIN
TO HYD BRAKES
E9
E8
AA
BB
RAISE
LOWER
RACK BACK
DUMP
LOWER CLOSE
OPEN RAISE
LL
KKJJHHGG
FFEE
E4
E1
E2
E3 E5
E6
E7
ACCUMULATOR AS.
RIDE CONTROL
108-5933
CONNECTOR
8C-0564
CONNECTOR
ORIFICE
128-7063
CONNECTOR
ORIFICE
128-7063
COOLER
130-8842
COOLER AS
BRAKE OIL
COOLING
ATTCH
134-2454
COOLER AS
BRAKE OIL
COOLING
ATTCH
134-2454
CYLINDER GP
LIFT (LH)
133-2964
CYLINDER GP
LIFT (RH)
133-2963
CYLINDER GP
STEERING
133-1747
CYLINDER GP
TILT
966: 144-9005
972: 133-2962
CYLINDER GP
AUXILIARY
FILTER GP
OIL, HYDR.
FAN / COOLER FLOW
134-3016
MANIFOLD GP
LIFT, STANDARD
130-2073
MOTOR GP
HYDRAULIC FAN
161-8919
PUMP GP
HYDRAULIC FAN
162-0770
PUMP GP
STEERING
IMPLEMENT
PILOT / BRAKE
167-1154
PUMP AND MOTOR GP
SECONDARY STEERING
154-2563
SCREEN GP
CASE DRAIN
STEERING PILOT
154-2883
VALVE
BREAKER RELIEF
9T-0818
SCREEN GP
6E-5065
TANK GP
HYDRAULIC
133-1843
VALVE GP
CHECK
STEERING QUAD
111-7775
VALVE GP
CHECK
RIDE CONTROL
9T-3096
VALVE GP
CHECK
AIR PURGE, AIR BLEED
3G-8607
VALVE GP
MAIN CONTROL
2 FUNCTION, STANDARD: 120-7477
3 FUNCTION, LOGGING: 120-7475
3 FUNCTION, ATTACHMENT: 120-7473
1 FUNCTION, FIELD CONVERSION: 120-7611
VALVE GP
COOLER BYPASS
9T-6005
VALVE GP
SEC. STEERING
DIVERTER
141-2597
VALVE GP
DIVERTER
RIDE CONTROL
137-3520
VALVE GP
FLOW DIVIDER
AXLE OIL CLR
133-1729
VALVE GP
STEERING
NEUTRALIZER
8J-1553
VALVE GP
STEERING
NEUTRALIZER
8J-1553
VALVE GP
PILOT
COMMAND CONTROL STEERING
164-4116
VALVE GP
PILOT
OIL MANIFOLD
2 FUNCTION: 142-3997
3 FUNCTION: 142-3998
VALVE GP
RELIEF
LINE, AUX,
HEAD END
4T-2742
VALVE GP
RELIEF
LINE, AUX,
ROD END
4T-4162
VALVE GP
RELIEF
MAIN, STANDARD: 6E-6003
LOGGING: 6E-6185
VALVE GP
RELIEF
LINE, TILT,
HEAD END
STANDARD 2 OR 3
VALVE: 6E-2377
LOGGING: 4T-2764
VALVE GP
RELIEF
LINE, TILT,
ROD END
STANDARD 2 OR 3
VALVE: 6E-2377
LOGGING: 9T-8488
VALVE GP
SHUTTLE
STEERING
8J-6875
VALVE GP
STEERING
COMMAND CONTROL STEERING
133-1728
VALVE GP
BALL,
MANUAL
(LOWERING
CONTROL)
112-1817
PLATE
ORIFICE
8V-2080
SCREEN GP
6E-5065
FRONT BRAKES
REAR BRAKES
ACCUMULATOR AS.
BRAKE (CHARGED)
198-9841
ACTUATOR AS.
PARKING BRAKE
154-8042
PARKING BRAKES
CONTROL GP
FOOT BRAKE
193-1448
SENSOR GP
POSITION
(ROTARY, LFT BRK PDL)
214-4863
SWITCH AS
LIMIT
STOP LIGHT
105-6117
SWITCH AS
PRESSURE
PARKING BRAKES
3E-6452
VALVE GP
ACCUMULATOR
229-9984
VALVE GP
BRAKE CONTROL
PARKING
106-1774
VALVE GP
BRAKE CONTROL
SERVICE
210-5587
BRAKES, PARKING AND SERVICE
SWITCH AS
PRESSURE
3E-7693
CROSSOVER RELIEF
SHUTTLE VALVE
DIRECTIONAL SPOOL
MAKE-UP
CHECK
BACK-UP
RELIEF
PRESSURE
REDUCING
VALVE
REGULATED PRESS. PORT
TO PILOT VALVE
PILOT PORT “B”
PILOT PORT “A”
CYLINDER
PORT
“A”
CYLINDER
PORT
“A”
CYLINDER
PORT
“B”
