SENR5884-01
20 Page, DGM
©
2003 Caterpillar
All Rights Reserved
Printed in U.S.A.
SENR5884-01
November 2003
980G Wheel Loader
Hydraulic System
9CM1-Up
2KR1-Up
2SR1-Up
6
4
1
23
AA
BB
5
5
CC
GG
HH
JJ
KK
LL
A
B
C
D
E
F
G
1
2
345
6
78 9
A
B
C
D
E
F
G
98765
4321
E95179
1
3
4
5
6
7
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
Item
No.
Component
Schematic
Location
Service Brake Oil Pressure Switch
A1
27
Schematic
Location
Pressure
Tap
Description
D7
28
29
30
F4
AA
BB
CC
DD
EE
FF
GG
HH
JJ
KK
LL
MM
NN
A4
B5
B8
C1
C5
C3
E1
E3
F1
F5
F1
Tilt Rod End
Lift Head End
Tilt Head End
Lift Rod End
Brake Pressure
Implement Relief
Implement Return
Pilot Pressure
Steering Pressure
Oil Cooler Return
Implement Pressure
Steering Relief
Fan Relief
Chart A
980G Hydraulic Pressure Tap Locations
* The one stem valve is an attachment field conversion. The two stem valve is standard. The three stem valve is the logger attachment.
# Available in standard, logger, or high lift configurations.
@ Ride Control Attachment
6
KK
AA, BB
CC, DD, EE, HH, LL
LL, MM
6
6
KK
5
CC, DD, EE, HH, LL
AA, BB
LL, MM
GG
DD
EE
FF
NN
MM
89
7
10
11
12
13
14
15
16
17
18
19
21
20
22
23
24 25 26
28
27
32
29
30
31
33
34
35 36
37
38
39 40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58 59
60
61
62
63
64
66
66
31
32
33
C7
D6
C2
C6
C7
Screen
Flow Control Valve Group
C1
Main Relief Valve
Parking Brake Pressure Spool
C6
C9
C8
Manually Operated Parking Brake Spool
Service Brake Low Oil Presure Switch
Load Sensing Spool
C7
Parking Brake Control Valve
B9
Inverse Shuttle Check Valve
Accumulator Charging Valve
B7
Tandem Spool Assembly
B9
B7
Front Service Brakes Accumulator
Rear Service Brakes Accumulator
Check Valve
Tilt Head End Relief Valve
Tilt Rod End Relief Valve
B3
B4
B5
B5
Ride Control Check Valve @
A7
A8
A6
Service Brake Control Valve
Rear Service Brakes
Front Service Brakes
Ride Control Relief Valve @
Lift Cylinder
A5
Tilt Cylinder #
Auxiliary Cylinder
A3,A4
Auxiliary Rod End Relief Valve
A2
Auxiliary Head End Relief Valve
Main Control Valve *
Ride Control Solenoid Valve @
Ride Control Accumulator @
Chart B
980G Hydraulic Component Locations
Steering Cylinders
Pilot Valve
Ride Control Diverter Valve @
Hydraulic Oil Tank
66
65
64
63
62
61
60
Backup Relief
Fan Pump
Regulated Pressure Port to Pilot Valve
Pressure Reducing Valve
Pump Port
Diverter Valve
F7
F2
F7
G3
G5
F4
F3
F2
F7
F6
59
58
57
56
55
54
53
Steering Pilot Oil Shuttle Valve
PilotPort(A)
Makeup Check Valve
Implement Pumps
Breaker Relief Valve
Filter Element
Supplemental Steering Pump
F3
F2
F4
E7
52
51
50
49
48
47
Fan Motor
Hydraulic Oil Cooler
Steering Pump
Selector Valve
Load Sensing Pump Port
Shuttle Valve
E6
E5
E3
E2
D7
D6
D9
D8
46
45
44
43
42
41
40
39
38
37
36
35
34
Crossover Relief
Steering Valve
PilotPort(B)
Check Valve
Pilot Valve
Cooler Bypass Valve
Transmission Pump
Pilot/Brake Pump
Steering Cylinder Port (B)
Steering Cylinder Port (A)
Parking Brake
Transmission Control Module Pressure Switch
Pressure Relief Valve
Chart B
980G Hydraulic Component Locations
41, 51, 52
56, 61,
39, 40,
50, JJ
59, 66, NN
17, 18
42
9
36
28
5
10
57, 58
12, 20, 22,
24, 35, FF
11
7, 8, 13
65
33, 49, 53
1, 4, 16, 27, 30, 32,
41, 51, 52
11
59, 66, NN
9
28
10
36
10
17, 18
42
33
24, 35, FF
12, 20, 22,
57, 58, 65
11
56, 61,
39, 40, 50, JJ
7, 8, 13
1, 4, 16, 27, 30, 32,
49, 53
37, 38, 44, 45,
62, 63, 64
54, 55, 60,
46, 47, 48,
33
GG
45, 46, 47,
37, 38, 44,
48, 54, 55,
60, 62, 63, 64
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)
VARIABLILTY
LINE RESTRICTION
(VARIABLE)
LINE RESTRICTION
VARIABLE and PRESSURE
COMPENSATED
PRESSURE
COMPENSATION
PUMP: VARIABLE and
PRESSURE COMPENSATED
ENERGY TRIANGLES
HYDRAULIC PNEUMATIC
MEASUREMENT
PRESSURE
TEMPERATURE
FLOW
ROTATING SHAFTS
UNIDIRECTIONAL BIDIRECTIONAL
PUSH-PULL LEVER
PEDAL
GENERAL MANUAL
PUSH BUTTON
SPRING
MANUAL CONTROL SYMBOLS
HYDRAULIC MOTORS
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
HYDRAULIC PUMPS
FLUID STORAGE RESERVOIRS
CROSSING AND JOINING LINES
VALVE ENVELOPES
VALVE PORTS
BASIC COMPONENT SYMBOLS
FLUID CONDITIONER
PUMP or MOTOR
FLUID POWER SYMBOLS
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
VALVES
PILOT CONTROL SYMBOLS
RELEASED PRESSURE
EXTERNAL RETURN
INTERNAL RETURN
REMOTE SUPPLY PRESSURE
SIMPLIFIED
COMPLETE
INTERNAL
SUPPLY PRESSURE
ACCUMULATORS
SPRING LOADED
GAS CHARGED
SOLENOID
or MANUAL
SOLENOID
and PILOT
SOLENOID and
PILOT or MANUAL
COMBINATION CONTROLS
SOLENOID
SERVO
THERMAL
DETENT
HYDRAULIC AND PNEUMATIC CYLINDERS
DOUBLE ACTING
SINGLE ACTING
BASIC SYMBOL
SPRING LOADED
CHECK VALVES
TWO
POSITION
INFINITE
POSITIONING
FLOW IN ONE
DIRECTION
FLOW ALLOWED IN
EITHER DIRECTION
THREE
POSITION
CROSS
FLOW
PARALLEL
FLOW
INTERNAL PASSAGEWAYS
NORMAL POSITION
AB
PT
AB
PT
SHIFTED POSITION
INFINITE POSITION
CONTROL VALVES
ATTACHMENT
THIS SCHEMATIC IS FOR THE 980G
Part #: 108-0135-05
Components are shown installed on a fully operable machine with the key and engine
off and transmission shifter in neutral.
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Attachment
Air Line
SENR5884-01
20 Page, B/W, DGM
Schematic
Schematic
Location
Tap
Description
AA
BB
CC
DD
EE
FF
GG
HH
JJ
KK
LL
MM
NN
A4
B5
B8
E1
F1
Tilt Rod End
Lift Head End
Tilt Head End
Lift Rod End
Brake Pressure
Pilot Pressure
Steering Pressure
Oil Cooler Return
Implement Pressure
Steering Relief
Fan Relief
Chart A
980G Hydraulic Pressure Tap Locations
Implement Return
Implement Relief
C5
C1
C2
E4
F6
G3
1
3
4
5
6
7
Item
No.
Component
1
2
3
4
5
6
7
8
9
10
11
Location
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
Item
No.
Component
Location
A1
27
28
29
30
* The one stem valve is an attachment field conversion. The two stem valve is standard. The three stem valve is the logger attachment.
# Available in standard, logger, or high lift configurations.
@ Ride Control Attachment
31
32
33
C7
Screen
B7
Tilt Head End Relief Valve
Tilt Rod End Relief Valve
B3
B4
B5
A7
A8
A6
Service Brake Control Valve
Rear Service Brakes
Front Service Brakes
Lift Cylinder
A5
Tilt Cylinder #
Auxiliary Cylinder
Auxiliary Rod End Relief Valve
A2
Auxiliary Head End Relief Valve
MainControlValve*
Ride Control Solenoid Valve @
Ride Control Accumulator @
Chart B
980G Hydraulic Component Locations
Steering Cylinders
Hydraulic Oil Tank
Fan Pump
Regulated Pressure Port to Pilot Valve
Pressure Reducing Valve
Pump Port
Diverter Valve
Supplemental Steering Pump
E5
Parking Brake
Transmission Control Module Pressure Switch
Chart B
980G Hydraulic Component Locations
35
34
Pressure Relief Valve
Pilot Valve
Flow Control Valve
Check Valve
Ride Control Diverter Valve @
Parking Brake Pressure Spool
Manually Operated Parking Brake Spool
Service Brake Low Oil Pressure Switch
B8
B9
C6
C1
C5
C8
Load Sensing Spool
Parking Brake Control Valve
Inverse Shuttle Check Valve
Accumulator Charging Valve
Ride Control Check Valve @
Tandem Spool Assembly
Rear Service Brake Accumulator
Front Service Brakes Accumulator
Ride Control Relief Valve @
Check Valve
Main Relief Valve
B7
B9
B7
B6
B9
B8
B1
Ride Control Shuttle Valve @
A4
A3
70
69
68
67
66
65
64
63
62
61
60
59
Steering Pilot Oil Shuttle Valve
Fan Motor
Ball Valve
Implement Pump
Backup Relief
G5
G4
G2
F9
F8
F6
F4
F2
F1
F9
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
Filter
Thermal Valve
Breaker Relief Valve
Steering Pump
Makeup Check Valve
Check Valve
Cooler Bypass Valve
Hydraulic Oil Cooler
Transmission Pump
Pilot/Brake Pump
Pilot Port (A)
Steering Neutralizer Valves
Pilot Valve
Load Sensing Pump Port
Pilot Port (B)
F3
F2
F1
E9
E6
E4
E2
E1
43
42
41
40
39
38
37
36
D8
D7
D9
Shuttle Valve
Steering Cylinder Port (B)
Steering Cylinder Port (A)
Crossover Relief
Steering Valve
Screen
D7
E8
E9
E7
E8
D9
Schematic
Pressure
THIS SCHEMATIC IS FOR THE 980G (UPDATE)
Part #: 174-9175-01
Components are shown installed on a fully operable machine with the key and engine
off and transmission shifter in neutral.
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Attachment
Air Line
A
B
C
D
E
F
G
1
2
345
6
78 9
A
B
C
D
E
F
G
98765
4321
6
KK
AA, BB
6
KK
5
AA, BB
9
5
10
11
9
10
11
E95339
AA
BB
CC
DD
EE
FF
GG
HH
JJ
LL
KK
MM
NN
1234455
16
1514
66
13
78 9 1110 12
17 18 19
21 22
20
23 24
25 26 27 28
29 31
30
343332
35
36 37 38
41
424039
43
44
45
4747
48
46
49 50 5251
56
57
58
60 61 62
55
53
54
59
66
64
6563
67 68 69 70
1, 4, 13, 14, 15, 16, 32,
33, CC, DD, EE, HH, LL
17, 29
35
36, GG
63
69, 70, MM
51, 52, 57,
61, 62
45, 59, 64,
65, 66
LL, NN
60, 68,
49, 50, 55, JJ
56, 58, 67
35
46, 47
15, 16
7, 8, 21
38
10
6
39, 40, 43,
44, 48, 53
12, 18, 19, 20, 22,
23, 24, 25, 26, 27,
28, 30, 31, 34, 37, FF
51, 52, 57,
61, 62
60, 68,
LL, NN
69, 70, MM
49, 50,
55, JJ
39, 40, 43,
44, 48, 53
18, 19
46, 47
38
17, 29
33, CC, DD, FF, HH, LL
1, 4, 13, 14, 15, 16, 32,
7, 8, 21
11
12, 18, 20, 22, 23,
24, 25, 26, 27, 28,
30, 31, 34, 37, EE
56, 58
67
35, 63
36, GG
45, 59,
64, 65, 66
