RENR6019-01 April2003
980G Series II Wheel Loader Hydraulic System AWH1-UP AXG1-UP AYT1-UP
© 2003 Caterpillar All Rights Reserved
Printed in U.S.A.
1 0 9 1 0 6 P B E S
1
2
1
2
3
3
4
6
5
4
6
5
8
7
7
8
11
10
9
9 13
12
A
A
11
35, 44, 45, 51
AA
1, 2, 3, 4, 17, 18, 19, 20, 28,32 CC, DD, EE, HH, LL
6
34, 46, 47, JJ GG
KK
AA, BB 33
9
10
5
OO
BB
16
15
14
CC 18
19
PP
21
20
22 17
B
B
DD
36, 52 NN
11 53, 54,57
EE
23
50
23, 25, 26, 27, 30, EE
24
FF
37, 38,39 OO, PP
6
17,18, 51 12, 21, 22, 24, 35, FF
34, 46, 47 JJ
10
7, 8, 14 15, 29
GG
26
27
28 35, 44, 45, 51
HH C
C 29
31
16, 24
25
34, 46, 47, JJ
13
1, 2, 3, 4, 17, 18, 19, 20, 28, 31, 32 CC, DD, EE, HH, LL
36 37, 39 AA, BB
KK
30
9
28
5
32
33
D
D
36, 52 NN
55, 58, 59 11
12, 22 24, 35, FF OO, PP
GG 33, 49, 53
16, 24
6
31
10
7, 8, 13 40, 41, 42, 43, 48, 56
JJ ChartA 980G Hydraulic Pressure Tap Locations Pressure Tap
40
34
1 0 9 1 0 6 R N E R
35
36
37
41
42
39
38
E
44
45
KK 47
46
Description
BB
Tilt Head End Tilt Rod End
CC
Lift Head End
DD
Lift Rod End
Schematic Location Chart B 980GHydraulicComponent Locations
A4 Item No.
B5
EE
BrakePressure
B8
FF
ImplementRelief
C1
GG
ImplementReturn
C5
HH
PilotPressure
JJ
SteeringPressure
C3 E1
KK
Oil Cooler Return
E3
LL
ImplementPressure
F1
MM
SteeringRelief
F5
NN
Hydraulic Fan Relief
F1
OO PP
Rear Service Brake Pressure
A8
Front Service Brake Pressure
B8
E
51
ImplementPressure PilotPressure
MM
LL 53
NN
54
56
55
ReturnLines Components
Main Control Valve *
2
Auxiliary Rod End Line Relief Valve
3
Auxiliary Head End Line Relief Valve
4
Auxiliary Cylinder
5
Tilt Cylinder #
6
Lift Cylinder
7
Ride Control Shuttle Valve @
8
Ride Control Solenoid Valve @
9
Ride Control Accumulator @
10
Front Service Brakes
11
Rear Service Brakes
F
57
980G SERIES II WHEEL LOADER 58
59
HYDRAULIC SCHEMATIC
1
2
3
4
5
6
7
8
9
Component
Schematic Location C1
31
Dead Battery Manual Lower Valve
32
Pilot V alve (OilManifold)
33
Steering Cylinders
D6
A3
34
Pilot/BrakePump
E1
A3,A4
35
Fan System(Hydraulic Motor)
E3
36
Electrohydraulic Control Valve
E4
37
Steering Pilot Valve
A2
A5
A6
C1
E4
38
St ee ri ng F li e t r S cr ee n G ro up
E5
39
SteeringNeutralizerValves
E6
40
Steering Crossover Relief Valve
E6
Steering Shuttle Valve
E6
A8
42
Steering Valve
E7
Right Pedal Assembly
B5
43
Se t er n i g B ac k U p R el ei f V al ve
14
Ride Control Check Valve @
A7
41
Service Brake Control Valve
B5
44
Hydraulic OilCooler BypassValve
Ride Control Relief Valve @
B6
45
Hydraulic Oil Cooler
E3
16
Parking Brake
B9
46
TransmissionPump
F1
Main Relief Valve
E7 E3
Steering Pump
Dump Line Relief Valve
B1 B3
47
18
48
SteeringShuttleValve
19
Tilt Back Line Relief Valve
B4
49
Ste er ng i Ch ec kVal ve
20
Check Valves (Ride Control)
B5
50
MainImplementPump
F2
21
R ea r S er vi ce B ra ke A cc um ul at or
B7
51
Hydraulic Oil filter Group
F3
22
Front Service Brake Accumulator
B7
52
Hydraulic Fan Pump
F3
23
Accumulator Charging Valve (Service Brakes)
B7
53
24
Parking Brake Actuator
B9
54
25
Service Brake Low Oil Pressure Switch
B8
55
26
Parking Brake Pressure Spool
C8
56
Set e ri n gP r es s ur e R e du cni g V al v e
27
Parking Brake Pressure Switch
C9
57
Filter Screen Group
28
Filter Screen (Pilot Valve)
C1
58
Secondary Steering Diverter Valve
F3 G5
59
Steering Pressure Switch
G6
29
Rd i e C on rt ol D v i er e t r V al ve @
C6
30
Service Brake Pressure Relief Valve
C8
Hydraulic Oil Tank Breaker Relief Valve S ec on da ry S et er ni gP um p
* 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.
G
171-3038-00
F03719
Item No.
15
@ Ride Control Attachment
G
Chart B 980GHydraulicComponent Locations Schematic Location A1
13
17
LINEAR PATTERNS
52
F
Component
1
12
49
48
50
AA
43
F2 F5 F5
F2 F4 F6
