A
B
C
D
E
F
G
1
2
3
45
6
7
A
B
C
E
F
G
765
4321
12
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
Item
No.
Component
1
2
3
4
5
6
7
8
9
10
11
Schematic
Location
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
Schematic
Location
AA
BB
CC
DD
Item
No.
Component
Schematic
Location
Pressure
Tap
Description
27
28
29
30
31
32
33
34
* Secondary Steering is an optional attachment.
FF
GG
HH
JJ
A3
# Ride Control is an optional attachment.
A7
35
37
38
39
40
41
42
43
44
45
Steering Cylinders
Steering Backup Relief Valve
F5
46
47
Chart A
Chart A
Tilt Cylinder
Auxiliary Cylinders @
Lift Cylinders
Front Service Brakes
Left Pedal Assembly
Right Pedal Assembly
Service Brake Control Valve
Front Service Brakes Accumulator
Rear Service Brakes Accumulator
Parking Brake
Parking Brake Actuator
Orifice
Ride Control Accumulator #
Main Relief Valve
Line Relief Valve (Aux. Cylinder Head End) @
Line Relief Valve (Aux. Cylinder Rod End) @
Line Relief Valve (Tilt C ylinder Rod End)
Line Relief Valve (Tilt C ylinder Head End)
Rear Service Brakes
Accumulator Charging Valve
Parking Brake Control Valve
Parking Brake Pressure Switch
Service Brake Oil Pressure Switch
Pilot Valve (Oil Manifold)
Hydraulic Oil Filter
Hydraulic Oil Cooler Bypass Valve
Hydraulic Oil Cooler
Secondary Steering Valve *
Left Steering Neutralizer Valve
Right 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 Pressure
Rear Service Brake Pressure
Front Service Brake Pressure
Service Brake Accumulator Pressure
Implement Pilot Pump Pressure
Implement Pump Pressure
Fluid Sampling Valve
KK
LL
MM
Steering Pump Pressure
Fan Drive Pump Pressure
Steering Signal Pressure
A1
A2
A4
A5
A6
A3
A4
A5
A1
A2
A3
B5
B6
B7
C6
C1
C3
D5
D7
F3
F4
F6
A5
C6
C4
D1
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
50
51
52
Brake Oil Cooler
Screen Group
F2
F1
Flow Divider Valve (Brake Oil Cooler)
E2
Ball Valve (Hydraulic Lever Lock)
Check Valve
Check Valve
C1
B4
Chart B
Steering Metering Pump
1,
AA, BB
FF, MM
2
36, 7
1,
3
25
CC, DD, MM
13 - 20,
HH
4
21
48
28, GG
9, 10,
49, 50,
51, KK
27
22 - 24,
11, 12
6, 7
JJ
29, 30
29, 30 8, 9,
CC, DD,
10, 48,
13 - 20, 28
JJ
5
4
GG
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
31
32 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
F2
D4
D4
Electro-Hydraulic Control
E2
E1
E3
E2
53
F2
52 52
53
42
43
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, 37
43, 53,
35
33, 34
JJ
LL
E3
E2
A
A
B
B
SECONDARY STEERING SUCTION
C
P
T
X
B
S
L1
PILOT/BRAKE
IMPLEMENT
STEERING
STEERING LOAD SENSE SIGNAL
STEERING RETURN
IMPLEMENT PILOT/PILT STEERING RETURN
IMPLEMENT RETURN
TO
BRAKE
DRAIN
AUX
LIFT
TILT
LOWER/CLOSE
OPEN/RAISE
TILT BACK
DUMP
LOWER
RAISE
TO
TRANSMISSION
CONTROL
TO BRAKE
LIGHTS
TO
TRANSMISSION
CONTROL
F06057
A
966G SERIES II
AXJ636-UP
ANT1-UP
ANZ1-UP
AWY431-UP
972G SERIES II
AXC526-UP
AXN253-UP
ANY1-UP
AWP1-UP
NOT USED ON THE
THE RELIEF VALVE IS
FOLLOWING MACHINES:
Pilot Pressure
LINEAR PATTERNS
Return Lines
Pressure
Components
Denotes Wire Code
RENR4398-03
20 Page
RENR4398-03
May 2006
966G & 972G Series II Wheel Loader
Hydraulic System
AWY1-UP
AXC1-UP
AXE1-UP
AXJ1-UP
AXN1-UP
AXL1-UP
ANT1-UP
ANY1-UP
AXP1-UP
ANZ1-UP
AWP1-UP
AWZ1-UP
©
2006 Caterpillar
All Rights Reserved
Printed in U.S.A.
RENR4398-03
20 Page
A
B
C
D
E
F
G
1
2
5
6
7
A
B
C
D
E
F
G
765
4321
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
KK
LL
NN
25
27
24
29
31
40
41
34
35
36
33
13
26
28
30
39
3837
32
Item
No.
Component
1
2
3
4
5
6
7
8
9
10
11
Schematic
Location
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
Schematic
Location
AA
BB
CC
DD
Item
No.
Component
Schematic
Location
Pressure
Tap
Description
* Secondary Steering is an optional attachment.
A3
# Ride Control is an optional attachment.
A7
Steering Cylinders
Tilt Cylinder
Auxiliary Cylinders @
Lift Cylinders
Front Service Brakes
Left Pedal Assembly
Right Pedal Assembly
Service Brake Control Valve
Front Service Brakes Accumulator
Rear Service Brakes Accumulator
Parking Brake
Parking Brake Actuator
Orifice
Ride Control Accumulator #
Main Relief Valve
Line 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 Brakes
Accumulator 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 Pressure
Rear Service Brake Pressure
Front Service Brake Pressure
Service Brake Accumulator Pressure
A1
A2
A4
A5
A6
A3
A5
A1
A2
A3
B5
B6
B7
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) i s 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 Wheel
Manifold (Orifice and Screen)
Orifice
Screen
Check Valve
Shuttle Valve
Implement Pump Pressure
EE
FF
GG
HH
JJ
KK
LL
MM
NN
PP
Pilot Pump Pressure
Auxiliary Pilot Pump Pressure
Auxiliary Pilot Pump Pressure
Tilt Pilot Pump Pressure
Tilt Pilot Pump Pressure
Lift Pilot Pump Pressure
Lift Pilot Pump Pressure
Steering Pilot Pressure
Steering Pilot Pressure
Steering Pilot Pressure
Steering Control Valve
Neutral Pilot Pressure
C1
C6
C7
D7
D5
D4
D5
E5
E6
E7
E2
E1
F5
F6
F7
B1
B2
B3
C4
C5
C6
D1
E2
E6
E3
E4
F4
F6
Chart C
Fluid Sampling Valve
Steering Pump Pressure
RR
SS
TT
UU
VV
WW
Fan Drive Pump Pressure
ZZ
Steering Signal Pressure
F5
60
59
58
57
56
55
54
53
52
51
50
49
F2
Brake Oil Cooler
F4
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
28
29
30
Screen Group
Check Valve
Check Valve
C4
Implement Pump
Flow Divider Valve (Brake Oil Cooler)
E2
Fan Drive Pump
Hydraulic Oil Cooler
Fan Drive Motor
Shuttle Valve
F4
Secondary Steering Valve *
Right Steering Neutralizer Valve
Pressure Reducing Valve
Steering Backup Relief Valve
Steering Pump
Pilot/Brake Pump
Screen Group
F1
4
GG
2
3
6, 7
1,
2521 4
NN
3
13 - 20,
22, 23,
29, 30
8, 31, 38
CC, DD 24, 25, 27,
EE, FF, GG
HH, JJ, KK
LL, UU, VV
6, 7, 26, 31,
11, 12
32, 37
SS, WW
39, 40, 41,
34, 35, 36,
9, 10,
42, MM
5, 59
NN
21, 59
11, 12
1, 13 - 20,
24, 25, 27, 28,
HH, JJ, KK,
LL, UU, VV
AA, BB
32, 37
MM, PP, ZZ
8, 9, 10, 26
33
22, 23,
29, 30
42
34, 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
F1
61
Chart D
966G II and 972G II Hydraulic Pressure Tap Locations
Chart C
966G II and 972G II Hydraulic Component Locations
966G II and 972G II Hydraulic Component Locations
42
43 44
45
46
47
48
49
50 51
52
53
54
60
55 56
57
57
58
59 59
Electro-hydraulic control
E3
F3
F2
E3
Hydraulic Oil Cooler Bypass Valve
47, TT
45, 53, 54
51, 60
28, 50
44
45, 55, 56
57, 59
61, RR
52, PP, ZZ
55, 56
51, 60
40, 41, 48, 53
54, 57, WW
38, 52, CC, DD
50, EE, FF, GG
47, 49, TT
44
57, 59,
61, RR
31, 46
E2
TRANSMISSION
CONTROL
BK
RD
BU
RD
BU
TO BRAKE
LIGHTS
TO
TRANSMISSION
CONTROL
TO
Pilot Pressure
LINEAR PATTERNS
Return Lines
Pressure
Components
Denotes Wire Code
L1
S
B
X
P
T
C
BA
A
A
B
S
A
966G SERIES II
AXJ636-UP
ANT1-UP
ANZ1-UP
AWY431-UP
972G SERIES II
AXC526-UP
AXN253-UP
ANY1-UP
AWP1-UP
NOT USED ON THE
THE RELIEF VALVE IS
LOWER/CLOSE
OPEN/RAISE
FLOAT
LOWER
RAISE
DUMP
TILT BACK
BRAKE
DRAIN
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
TILT BACK
DUMP
LOWER
RAISE
FOLLOWING MACHINES:
43
12
11
10
9
6
8
7
5
