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A
B
C
D
E
F
G
1 2 3 4 5 6 7
A
B
C
E
F
G
7654321
1 2 4 5
AA
BB CC
DD
6 7 8 9 10 11 123
FF
GG
HH
14 15
16 17 18 19 20
21 22 23 24
KK
MM
26
25
29 30
49 50 51
27
D
13
28
ItemNo. Component
12
3
4
5
6789
1011
SchematicLocation
1213
1415
1617
18
19
2021
2223
2425
26
SchematicLocation
AABB
CC
DD
ItemNo. Component
SchematicLocation
PressureTap Description
2728
29
30
31
323334
* Secondary Steering is an optional attachment.
FF
GG
HHJJ
A3
# Ride Control is an optional attachment.
A7
35
373839
40
4142
4344
45
Steering Cylinders
Steering Backup Relief Valve F5
46
47
Chart A Chart A
Tilt CylinderAuxiliary Cylinders @
Lift CylindersFront Service BrakesLeft Pedal AssemblyRight Pedal Assembly
Service Brake Control ValveFront Service Brakes Accumulator
Rear Service Brakes AccumulatorParking BrakeParking Brake Actuator
Orifice
Ride Control Accumulator #Main Relief ValveLine Relief Valve (Aux. Cylinder Head End) @
Line Relief Valve (Aux. Cylinder Rod End) @
Line Relief Valve (Tilt Cylinder Rod End)Line Relief Valve (Tilt Cylinder Head End)Rear Service BrakesAccumulator Charging ValveParking Brake Control Valve
Parking Brake Pressure Switch
Service Brake Oil Pressure Switch
Pilot Valve (Oil Manifold)
Hydraulic Oil Filter
Hydraulic Oil Cooler Bypass ValveHydraulic Oil Cooler
Secondary Steering Valve *
Left Steering Neutralizer ValveRight Steering Neutralizer Valve
36
Steering Pump
Implement Pump
Breaker Relief Valve
Fan Drive Pump
Fan Drive Motor
Secondary Steering Pump and Electric Motor*
Steering Control Valve
Steering Crossover Relief Valve
Hydraulic Oil Tank
Tilt Cylinder Rod End Pressure
Tilt Cylinder Head End PressureRear Service Brake PressureFront Service Brake PressureService Brake Accumulator PressureImplement Pilot Pump PressureImplement Pump PressureFluid Sampling Valve
KK
LL
MM
Steering Pump Pressure
Fan Drive Pump Pressure
Steering Signal Pressure
A1A2
A4
A5
A6
A3A4
A5A1
A2
A3B5
B6
B7
C6
C1
C3
D5
D7
F3F4
F6
A5
C6
C4D1
E5
F4
Pilot/Brake Pump
A3
Ride Control Diverter Valve #
Pilot Control Valve
Main Control Valve %
The three stem valve is an optional attachment.
@ Auxiliary Cylinders are an optional attachment.
% The one stem valve (third function) is an
The two stem valve is standard.optional attachment field conversion.
48
49
505152 Brake Oil Cooler
Screen Group
F2
F1
Flow Divider Valve (Brake Oil Cooler)E2
Ball Valve (Hydraulic Lever Lock)
Check ValveCheck Valve C1
B4
Chart B
Steering Metering Pump
1,
AA, BBFF, MM
2
36, 7
1, 3
25
CC, DD, MM 13 - 20,
HH
421
48
28, GG
9, 10,49, 50,51, KK
2722 - 24,
11, 12
6, 7JJ
29, 30
29, 30 8, 9,
CC, DD,10, 48, 13 - 20, 28
JJ
5
4GG
21
27
49, 50,51, KK
11, 12
HH
22 - 24,
187-6676-00
966G II & 972G II PILOT IMPLEMENT/STEERING METERING PUMP HYDRAULIC SCHEMATIC
3132 33 34
35
36 37
38
39
40 41
47
48
44 45 46 43
966G II and 972G II Hydraulic Pressure Tap Locations
966G II and 972G II Hydraulic Component Locations 966G II and 972G II Hydraulic Component Locations
F2D4
D4
Electro-Hydraulic Control
E2E1E3
E2
53 F2
52 52
53
4243
36, 37 41, LL 32, 37 FF 8, 33, 37,
31
38
39, 44, 45 43, 53,
34, 35
38, LL
31
32, 47
39, 44, 45
40,42 - 48
36, 3743, 53,
3533, 34
JJ
LL
E3
E2
A
A
B
B
SECONDARY STEERING SUCTION
C P
TX
B
S L1
PILOT/BRAKE
IMPLEMENT
STEERING
STEERING LOAD SENSE SIGNAL
STEERING RETURN
IMPLEMENT PILOT/PILT STEERING RETURNIMPLEMENT RETURN
TOBRAKEDRAIN
AUX LIFT
TILT
LOWER/CLOSE
OPEN/RAISE
TILTBACK
DUMP
LOWER
RAISE
TOTRANSMISSIONCONTROL
TO BRAKELIGHTS
TOTRANSMISSIONCONTROL
F06057
A
966G SERIES II
AXJ636-UPANT1-UPANZ1-UP
AWY431-UP
972G SERIES IIAXC526-UPAXN253-UPANY1-UPAWP1-UP
NOT USED ON THETHE RELIEF VALVE IS
FOLLOWING MACHINES:
Pilot Pressure
LINEAR PATTERNS
Return Lines
Pressure
Components
Denotes Wire Code
RENR4398-03
20Page
RENR4398-03May 2006
966G & 972G Series II Wheel LoaderHydraulic SystemAWY1-UPAXC1-UPAXE1-UP
AXJ1-UPAXN1-UPAXL1-UP
ANT1-UPANY1-UPAXP1-UP
ANZ1-UPAWP1-UPAWZ1-UP
©2006 CaterpillarAll Rights Reserved
Printed in U.S.A.
RENR4398-03
20Page
A
B
C
D
E
F
G
1 2 5 6 7
A
B
C
D
E
F
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7654321
1 2 3 4
14 15
181716 19 20
21 22 23
E4
E1
E2
E3 E5
E6
E7
AA
BB
CC
DD
LL
MM
NN
PP
UU
VV
SS
WW
ZZ
EE FF GG HH JJ KKLL
NN
25
27
24
29
31
40 41
34
35
36
33
13
26
28 30
393837
32
ItemNo. Component
12
3
4
5
67
8
9
10
11
SchematicLocation
12
13
1415
1617
18
19
2021
2223
2425
26
SchematicLocation
AABB
CC
DD
ItemNo. Component
SchematicLocation
PressureTap Description
* Secondary Steering is an optional attachment.
A3
# Ride Control is an optional attachment.
A7
Steering Cylinders
Tilt CylinderAuxiliary Cylinders @
Lift CylindersFront Service BrakesLeft Pedal AssemblyRight Pedal Assembly
Service Brake Control ValveFront Service Brakes Accumulator
Rear Service Brakes AccumulatorParking BrakeParking Brake ActuatorOrifice
Ride Control Accumulator #Main Relief ValveLine Relief Valve (Aux. Cylinder Head End) @
Line Relief Valve (Aux. Cylinder Rod End) @
Line Relief Valve (Tilt Cylinder Rod End)Line Relief Valve (Tilt Cylinder Head End)Rear Service BrakesAccumulator Charging Valve
Service Brake Oil Pressure Switch
Hydraulic Oil Filter
Left Steering Neutralizer Valve
Breaker Relief Valve
Secondary Steering Pump and Electric Motor*
Steering Control Valve
Steering Crossover Relief Valve
Tilt Cylinder Rod End Pressure
Tilt Cylinder Head End PressureRear Service Brake PressureFront Service Brake Pressure
Service Brake Accumulator Pressure
A1A2
A4
A5
A6
A3
A5
A1
A2
A3
B5
B6B7
A5
A3
Ride Control Diverter Valve #
Main Control Valve %
The three stem valve is an optional attachment.
@ Auxiliary Cylinders are an optional attachment.% The one stem valve (third function) is an
The two stem valve is standard.optional attachment field conversion.
Pilot Valve (Oil Manifold)27
Parking Brake Pressure Switch
Lowering Control Valve
Parking Brake Control Valve
Steering Pilot Valve
Steering WheelManifold (Orifice and Screen)OrificeScreen
Check Valve
Shuttle Valve
Implement Pump Pressure
EE
FF
GG
HH
JJ
KK
LL
MM
NN
PP
Pilot Pump Pressure
Auxiliary Pilot Pump PressureAuxiliary Pilot Pump Pressure
Tilt Pilot Pump PressureTilt Pilot Pump Pressure
Lift Pilot Pump PressureLift Pilot Pump Pressure
Steering Pilot Pressure
Steering Pilot Pressure
Steering Pilot Pressure
Steering Control Valve
Neutral Pilot Pressure
C1
C6C7
D7
D5
D4
D5
E5
E6
E7
E2
E1
F5
F6
F7
B1
B2
B3
C4
C5C6D1E2
E6
E3
E4
F4
F6
Chart C
Fluid Sampling ValveSteering Pump Pressure
RRSS
TT
UU
VV
WW
Fan Drive Pump Pressure
ZZ Steering Signal Pressure F5
60
59
585756
55
54
53
5251
50
49
F2Brake Oil CoolerF4
4847
4645
44
4342
41
4039
38
3736
35
34
33
3231
2829
30
Screen GroupCheck ValveCheck Valve C4
Implement Pump
Flow Divider Valve (Brake Oil Cooler)
E2
Fan Drive Pump
Hydraulic Oil CoolerFan Drive Motor
Shuttle Valve F4
Secondary Steering Valve *Right Steering Neutralizer ValvePressure Reducing Valve
Steering Backup Relief ValveSteering PumpPilot/Brake PumpScreen Group
F1
4
GG 2
3
6, 7
1,
2521 4
NN 3
13 - 20,22, 23,29, 30
8, 31, 38CC, DD 24, 25, 27,
EE, FF, GGHH, JJ, KKLL, UU, VV
6, 7, 26, 31, 11, 1232, 37
SS, WW
39, 40, 41,34, 35, 36,
9, 10,42, MM
5, 59NN
21, 5911, 12
1, 13 - 20,24, 25, 27, 28,
HH, JJ, KK,LL, UU, VV
AA, BB
32, 37MM, PP, ZZ
8, 9, 10, 26
33
22, 23,29, 30
4234, 35, 36, 39,
43, 47
43, 47
F06027 187-6676-00
966G II & 972G II E/H IMPLEMENT/COMMAND CONTROL STEERING HYDRAULIC SCHEMATIC
TT
RR
26
61
Hydraulic Oil Tank F161
Chart D966G II and 972G II Hydraulic Pressure Tap Locations
Chart C966G II and 972G II Hydraulic Component Locations 966G II and 972G II Hydraulic Component Locations
42 43 44
45
46
4748
49
50 51 52 5354
6055 56 57
57
5859 59
Electro-hydraulic control E3
F3F2
E3
Hydraulic Oil Cooler Bypass Valve
47, TT 45, 53, 54
51, 60
28, 50
44
45, 55, 56
57, 5961, RR 52, PP, ZZ
55, 56
51, 6040, 41, 48, 5354, 57, WW
38, 52, CC, DD 50, EE, FF, GG
47, 49, TT
44
57, 59,61, RR
31, 46
E2
TRANSMISSIONCONTROL
BK
RD
BU
RD
BU
TO BRAKELIGHTS
TO
TRANSMISSIONCONTROL
TO
Pilot Pressure
LINEAR PATTERNS
Return Lines
Pressure
Components
Denotes Wire Code
L1S
B
X
P
TC
B A
A
A
B
S
A
966G SERIES II
AXJ636-UPANT1-UPANZ1-UP
AWY431-UP
972G SERIES IIAXC526-UPAXN253-UPANY1-UPAWP1-UP
NOT USED ON THETHE RELIEF VALVE IS
LOWER/CLOSE
OPEN/RAISE
FLOAT
LOWER
RAISE
DUMP
TILT BACK
BRAKEDRAIN
TO
STEERING
STEERING LOAD SENSE SIGNAL
STEERING RETURN
IMPLEMENT RETURN
IMPLEMENT PILOT/PILOT STEERING RETURN
HIGH PRESSURE H.E. OR R.E.
SECONDARY STEERING SUCTION
FAN SUCTION
PILOT/BRAKE
IMPLEMENT
LIFT
TILT
AUX
LOWER/CLOSE
OPEN/RAISE
TILTBACK
DUMP
LOWER
RAISE
FOLLOWING MACHINES:
43
12111096 875