Caterpillar 2i5h6b
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INTERACTIVE SCHEMATIC Bookmarks
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Information Component Table Tap Table Fluid Power Symbols Electrical Symbols
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EC-C1
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UENR1249-02 January 2013
988H Wheel Loader Tier 3 Hydraulic System A7A1-UP BXY4000-UP
© 2013 Caterpillar, All Rights Reserved
Printed in U.S.A.
COMPONENT LOCATION Description
Part Machine Schematic Number Location Location
Description
Part Machine Schematic Number Location Location
Switch As -Pressure, Accumulator Charging
174-4312
59
Switch As -Pressure, Parking Brake Oil
174-4312
60
I-9
Tank As
152-3870
61
A-5
Tank As -Expansion
220-2948
62
B-3
Tank As - Hydraulic
153-3602
63
B-5
D-11
Tube
1U-1570
64
B-4
5
D-13
Valve
6E-1291
65
D-14
217-6719
6
G-11
Valve
102-4156
66
D-10
217-6720
7
E-10
Valve
102-4156
67
D-11
217-6720
8
E-11
Valve
102-4156
68
D-12
Actuator Gp - Pilot Control (Proportional Solenoid), Lower
217-6720
9
E-12
Valve
153-9990
69
G-11
Adapter - Orifice
122-2222
10
F-10
Brake Gp - Parking
174-1552
11
J-8
Valve -Breaker Relief Valve -Breaker Relief (EU Attachment)
9T-0818 220-0812
70
C-3
Coil As
326-5212
12
B-11
Valve - Diverter, Secondary Steering
2U-7345
71
F-5
Control Gp - Foot Brake
169-8258
13
J-11
Valve -Fluid Sampling
8C-3446
72
E-2
Cooler Gp - Hydraulic Oil
164-0058
14
D-2
Valve Gp - Check
9T-1013
73
B-14
Core As - Axle Oil Cooler
173-6753
15
I-2
Valve Gp - Check
9T-1013
74
C-8
Cylinder Gp - Lift, Left Hand Cylinder Gp - Lift, Left Hand (Block Handler)
173-8613 309-9547
16
Valve As - Check, Fan Motor Anti-cavitation
9T-3752
75
D-2
Valve Gp -Accumulator Charging
235-0251
76
H-10
Cylinder Gp - Lift, Right Hand Cylinder Gp - Lift, Right Hand (Block Handler)
173-8612 309-9546
17
Valve Gp -Brake Control, Parking
106-1774
77
J-9
Valve Gp -Brake Control, Service
200-0866
78
I-11
Cylinder Gp - Steering
288-0568
18
Cylinder Gp - Tilt Cylinder Gp - Tilt Cylinder Gp - Tilt (Block Handler)
271-6441 231-1955 309-9545
19
Filter Gp - Oil, Brake
287-8402
20
Filter Gp - Oil, Case Drain (Fan)
166-4647
21
Filter Gp - Oil, Case Drain (Implement Pump)
166-4647
22
Filter Gp - Oil, Case Drain (Steering)
166-4647
Filter Gp - Oil, Screen, Axle Oil Cooler
Accumulator Gp - Brake, CA Approved Accumulator Gp - Brake, CE Approved
350-5576 220-1432
Accumulator Gp - Ride Control, CA Approved Accumulator Gp - Ride Control, CE Approved
348-9283 259-4694
2
D-9
Actuator Gp - Pilot Control (Proportional Solenoid), Aux.
217-6719
3
D-10
Actuator Gp - Pilot Control (Proportional Solenoid), Dump
217-6719
4
Actuator Gp - Pilot Control (Proportional Solenoid), Raise
217-6719
Actuator Gp - Pilot Control (Proportional Solenoid), Tilt Actuator Gp - Pilot Control (Proportional Solenoid), Aux. Actuator Gp - Pilot Control (Proportional Solenoid), Rack
1
I-10
G-13
G-9 G-7
H-9
Valve Gp - Check
4T-5896
79
E-14
Valve Gp - Check, Air Purge
3G-8607
80
C-1
Valve Gp - Check, Axle Oil Cooler Fan Anti-cavitation
9T-5134
81
J-4
Valve Gp - Check, Axle Oil Cooler Fan Anti-cavitation
9T-3752
82
J-3
E-2
Valve Gp - Check, Hydraulic Oil Cooler By
6E-1454
83
D-3
C-3
Valve Gp - Check, Steering Pilot
9T-3096
84
E-6
A-10
Valve Gp - Check, Steering Pilot
104-7108
85
E-6
23
C-5
Valve Gp - Check, Steering Quad
149-4617
86
E-7
230-3633
24
I-5
Fitting (Quick Disconnect), Auxiliary (LL, KK)
6V-3965
25
F-10
Valve Gp - Control, 2 Function Valve Gp - Control, 3 Function
222-4436 291-8508
87
D-10 to F-14
Fitting (Quick Disconnect), Implement Pump Case Air Bleed
6V-3965
26
B-10
Valve Gp - Control, Tilt Regeneration
318-2925
88
G-11
Fitting (Quick Disconnect), Implement Pump Output (HH)
6V-3965
27
B-12
Valve Gp - Demand Fan
191-8735
89
D-1
Fitting (Quick Disconnect), Brake/Pilot Pump Output (CC)
6V-3965
28
C-1
Valve Gp -Fan Pump Control (Pressure, Flow Compensator)
207-0695
90
C-2
Fitting (Quick Disconnect), Fan Pump Load Sense (DD)
6V-3965
29
C-2
Valve Gp -Manual
112-1817
91
C-13
G-10
Fitting (Quick Disconnect), Fan Pump Output (GG)
6V-3965
30
C-3
Valve Gp -Pilot, Stic Steering
249-5615
92
C-7
Fitting (Quick Disconnect), Pilot Supply (AA)
6V-3965
31
E-3
Valve Gp -Pressure Reducing
185-1897
93
F-14
Fitting (Quick Disconnect), Steering Pump Case Air Bleed
6V-3965
32
D-5
Valve Gp -Pressure Reducing, Steering Pilot Oil Regulator
6E-4286
94
F-6
Fitting (Quick Disconnect), Steering Pump Output (BB)
6V-3965
33
D-6
Valve Gp - Relief
6E-6188
95
F-6
Impeller
146-8990
34
B-11
Valve Gp - Relief
334-8332
96
D-10
Manifold Gp - Control
322-3793
35
E-9
Valve Gp - Relief, Line Relief, Lift Cylinder Head End
144-0221
97
E-13
Manifold Gp - Hydraulic
326-3803
36
G-7
Valve Gp - Relief, Line Relief, Lift Cylinder Rod End
129-8293
98
E-13
Motor Gp - Axle Oil Cooler Fan
178-1602
37
I-3
Valve Gp - Relief, Line Relief, Tilt Cylinder Head End
117-0160
99
E-11
Motor Gp - Hydraulic Fan
213-5268
38
D-2
Valve Gp - Relief, Line Relief, Tilt Cylinder Rod End
334-0895
100
E-12
Plug - Orifice
8J-6815
39
D-9
Valve Gp - Relief, Line, Auxiliary
172-5481
101
E-11
Plug - Pipe
1T-0936
40
F-7
Valve Gp - Relief, Pilot
276-3650
102
E-3
Pump Gp - Axle Oil Cooler
292-9912
41
H-5
Valve Gp - Relief, Secondary Steering
6E-3986
103
F-5
Pump Gp - Hydraulic Fan Pump Gp - Hydraulic Fan, High Ambient Temperature
228-3636 228-3638
42
B-2
Valve Gp - Relief, Steering Cylinder Crossover
9T-7419
104
G-6
Valve Gp - Relief, Steering Cylinder Crossover
9T-7419
105
F-7
Pump Gp - Implement
346-6095
43
B-12
Valve Gp - Relief, Steering Implement, Pilot
276-3649
106
E-3
Pump Gp - Pilot, Brake Pump Gp - Pilot, Brake, Axle Oil Cooler Fan
177-8924 258-5060
44
B-1
Valve Gp - Ride Control
259-6275
107
D-9
Valve Gp -Selector and Pressure Control (Secondary Steering)
6E-5566
108
E-6
Pump Gp - Secondary Steering
150-7585
45
E-5
Valve Gp -Shuttle
4T-1860
109
F-14
Pump Gp - Steering
153-9624
46
D-6
Valve Gp -Shuttle
141-1481
110
C-8
Screen - Diff
178-0182
47
B-4
Valve Gp -Shuttle, Pump Pilot
4T-1860
111
F-6
Screen As
9T-9227
48
B-4
Valve Gp -Solenoid, 24 Volt
151-7455
112
B-14
Screen As
9T-9227
49
B-5
Valve Gp -Solenoid, 24 Volt, Hydraulic Lockout
149-2610
113
B-14
Screen As
7J-2656
50
B-4
Valve Gp -Solenoid, 24 Volt, Axle Oil Cooler
149-2610
114
J-4
Screen As
7J-2656
51
B-4
Valve Gp -Solenoid, 24 Volt, Ride Control
152-8340
115
C-9
Screen As
7J-2656
52
B-5
Valve Gp -Solenoid, Load Sensing
173-7455
116
C-13
Screen As
307-6457
53
F-7
Sensor Gp - Temperature, Hydraulic Oil
288-8390
54
B-3
Valve Gp -Steering Valve Gp -Steering, With Secondary Steering)
301-4599 301-4602
117
G-5
Sensor Gp - Temperature, Axle Oil
131-0427
55
J-13
Valve Gp -Steering Neutralizer
296-5662
118
D-7
Sensor Gp - Pressure
349-1178
56
B-12
Valve Gp -Steering Pump Control (Press., Flow Compensator)
176-7521
119
D-5
Sensor Gp - Pressure, Lift Cylinder Rod End
221-3416
57
F-9
Valve Gp -Steering Pump Control (Press., Flow Compensator)
176-7520
120
C-5
Switch As - Pressure, Filter By
339-4361
58
E-2
TAP LOCATION Tap Number
Description
Schematic Location
AA
Pilot Supply
E-3
BB
Steering Pump Cutoff
D-6
CC
Brake Charge
C-1
DD
Fan Drive Signal
C-2
EE
Front Brake Supply
I-10
FF
Rear Brake Supply
I-11
GG
Fan Drive Supply
C-2
HH
Main System Relief
B-12
II
Tilt, Rod End Line Relief
F-12
JJ
Tilt, Head End Line Relief
F-12
KK
Auxiliary Line Relief
F-11
LL
Auxiliary Line Relief
F-11
MM
Front Brake Pressure
I-13
NN
Rear Brake Pressure
I-13
Fluid Sampling Port
E-2
SOS
FLUID POWER SYMBOLS BASIC COMPONENT SYMBOLS
MAIN AUX.
PUMP or MOTOR
SPRING (ADJUSTABLE)
VARIABILITY
CONTROL VALVES
SPRING
FLUID CONDITIONER
PRESSURE COMPENSATION
LINE RESTRICTION (VARIABLE)
TWO POSITION
2-SECTION PUMP
HYDRAULIC PNEUMATIC ENERGY TRIANGLES
ATTACHMENT
LINE RESTRICTION
VALVE PORTS
TWO-WAY
THREE POSITION
PUMP: VARIABLE and PRESSURE COMPENSATED
VARIABLE and PRESSURE COMPENSATED
VALVES
VALVE ENVELOPES
ONE POSITION
LINE RESTRICTION (FIXED)
RESTRICTION
FOUR-WAY
THREE-WAY
CONTROL VALVES
CHECK VALVES
AB
AB
P T NORMAL POSITION
P T SHIFTED POSITION
INFINITE POSITION
SHUTTLE
SPRING LOADED
BASIC SYMBOL
PILOT CONTROLLED
FLUID STORAGE RESERVOIRS
VENTED
RETURN ABOVE FLUID LEVEL
PRESSURIZED
RETURN BELOW FLUID LEVEL
MEASUREMENT
PRESSURE
TEMPERATURE
ROTATING SHAFTS
FLOW
UNIDIRECTIONAL
BIDIRECTIONAL
COMBINATION CONTROLS
SOLENOID
SOLENOID or MANUAL
SOLENOID and PILOT or MANUAL
SOLENOID and PILOT
SERVO
DETENT
THERMAL
MANUAL CONTROL SYMBOLS
MANUAL SHUTOFF
PUSH-PULL LEVER
RELEASED PRESSURE
EXTERNAL RETURN
SPRING LOADED
HYDRAULIC PUMPS VARIABLE DISPLACEMENT NON-COMPENSATED
PEDAL
LINES CROSSING
LINES ING
VARIABLE DISPLACEMENT NON-COMPENSATED
UNIDIRECTIONAL
UNIDIRECTIONAL
BIDIRECTIONAL
BIDIRECTIONAL
INTERNAL SUPPLY PRESSURE
COMPLETE
HYDRAULIC AND PNEUMATIC CYLINDERS
SINGLE ACTING
DOUBLE ACTING
INTERNAL AGEWAYS
HYDRAULIC MOTORS FIXED DISPLACEMENT
SPRING
REMOTE SUPPLY PRESSURE
SIMPLIFIED
CROSSING AND ING LINES
GAS CHARGED
PUSH BUTTON
PILOT CONTROL SYMBOLS
INTERNAL RETURN
ACCUMULATORS
FIXED DISPLACEMENT
GENERAL MANUAL
INFINITE POSITIONING
FLOW IN ONE DIRECTION
THREE POSITION
PARALLEL FLOW
CROSS FLOW
TWO POSITION
FLOW ALLOWED IN EITHER DIRECTION
ELECTRICAL SYMBOLS Hydraulic Symbols (Electrical)
G Transducer (Fluid)
Transducer (Gas / Air)
Pressure Switch (Adjustable)
Pressure Switch
M
Generator
Electric Motor
Electrical Wire
Temperature Switch
Electrical Symbols (Electrical)
T
Pressure Symbol
Temperature Symbol
Level Symbol
Flow Symbol
Wire Number Identification Codes
Electrical Schematic Example
Hydraulic Schematic Example Current Standard
Current Standard Harness identification code This example indicates wire 135 in harness "AG".
Wire Circuit Number Identification
Wire Color
325-AG135 PK-14 325-PK Circuit Identification Number
Wire Color
Wire Gauge
Previous Standard Wire Color
Wire
325-PK-14 B Circuit Number Identification
A
Wire Gauge (EXAMPLE VALVE)
14
13
12
11
10
8
9
7
6
5
4
3
2
1
(114) VALVE GP - SOLENOID 24V, AXLE OIL COOLER 149-2610
FRONT AXLE IMPELLER CLUTCH PEDAL POSITION SIGNAL (TO TRANSMISSION CONTROL)
J
(13) CONTROL GP FOOT BRAKE 169-8258
STOPLAMP SW
J (11) BRAKE GP PARKING 174-1552
(77) VALVE GP BRAKE CONTROL, PARKING 106-1774
THROTTLE LOCK DISCONNECT SW
REAR AXLE
HITCH (55) SENSOR GP TEMP., AXLE OIL 131-0427
NN
AXLE OIL FAN RETURN
(81) VALVE GP - CHECK AXLE OIL COOLER FAN ANTI-CAVITATION 9T-5134
TRANSMISSION CONTROL NC
NO
(82) VALVE GP - CHECK AXLE OIL COOLER FAN ANTI-CAVITATION 9T-3752
FRONT
PARKING BRAKE INDICATION SW
24) FILTER GP - OIL AXLE OIL COOLER 230-3633
C
MM
(78) VALVE GP BRAKE CONTROL, SERVICE 200-0866
I
(60) SWITCH AS PRESSURE, PARKING BRAKE OIL 174-4312
(1) ACCUMULATOR GP BRAKE, CA APPROVED 350-5576 BRAKE, CE APPROVED 220-1432
TRANSMISSION CONTROL
(15) CORE AS AXLE OIL COOLER 173-6753
(37) MOTOR GP AXLE OIL COOLER FAN 178-1602
I
EE
FF REAR AXLE
(59) SWITCH AS PRESSURE, ACCUMULATOR CHARGING 174-4312
(41) PUMP GP AXLE OIL COOLER 292-9912
BRAKE ACCUM PRESS. SWITCH
AXLE OIL FAN SUPPLY
(76) VALVE GP ACCUMULATOR CHARGING 235-0251 H
H
AXLE COOLING SYSTEM
BRAKE SYSTEM
(18) CYLINDER GP STEERING 288-0568
TILT CYLINDER LIFT CYLINDER G (16) CYLINDER GP LIFT, LEFT HAND 173-8613 LIFT, LEFT HAND BLOCKER HANDLER 309-9547
(88) VALVE GP - CONTROL TILT REGENERATION 318-2925
(19) CYLINDER GP TILT 271-6441 TILT 231-1955 TILT BLOCKER HANDLER 309-9546
RIGHT TURN
LIFT CYLINDER
STEERING CYLINDER
(104) VALVE GP - RELIEF STEERING CYL. CROSSOVER 9T-7419
(17) CYLINDER GP LIFT, RIGHT HAND 173-8612 LIFT, RIGHT HAND BLOCKER HANDLER 309-9546
(69) VALVE 153-9990
(6) ACTUATOR GPPILOT CONTROL PROPORTIONAL SOL. 217-6719
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS (36) MANIFOLD GP HYDRAULIC 326-3803
(105) VALVE GP - RELIEF STEERING CYL. CROSSOVER 9T-7419
(10) ADAPTER ORIFICE 122-2222
(109) VALVE SHUTTLE 4T-1860
(98) VALVE GP RLF, LINE RLF LIFT CYL. R.E. 129-8293
II
JJ
KK
(95) VALVE GP - RELIEF 6E-6188 (103) VALVE GP - RELIEF SECONDARY STEERING 6E-3986
(94) VALVE GP PRESSURE REDUCING STR PILOT OIL REG. 6E-4286 (101) VALVE GP RLF, LINE, AUX. 172-5481
(53) SCREEN AS 307-6457
(40) PLUG - PIPE 1T-0936
(100) VALVE GP RLF, LINE RLF TILT CYL. R.E. 334-0895
(79) VALVE - CHECK 4T-5896
(108) VALVE GP SEL./ PRESS. CNTRL (SEC. STR) 6E-5566
AXLE OIL FAN RETURN
(45) PUMP GP SECONDARY STEERING 150-7585
(106) VALVE GP RELIEF, STEERING IMPLEMENT, PILOT 276-3649
LOWER
(9) ACTUATOR GPPILOT CONTROL PROPORTIONAL SOL. 217-6720
(8) ACTUATOR GPPILOT CONTROL PROPORTIONAL SOL. 217-6720
RACK
(68) VALVE 102-4156
(7) ACTUATOR GPPILOT CONTROL PROPORTIONAL SOL. 217-6720
(96) VALVE GP RELIEF 334-8332
(67) VALVE 102-4156
RIGHT NEUT
LEFT NEUT
(39) PLUG - ORIFICE 8J-6815
(65) VALVE 6E-1291
RAISE
DUMP
(5) ACTUATOR GP PILOT CONTROL PROPORTIONAL SOL 217-6719
(4) ACTUATOR GP PILOT CONTROL PROPORTIONAL SOL. 217-6719
(33) FITTING QUICK DISCONNECT 6V-3965
(118) VALVE GP STEERING NEUTRALIZER 296-5662
RIDE CONT
(3) ACTUATOR GPPILOT CONTROL PROPORTIONAL SOL. 217-6719
BB (115) VALVE GP - SOL. 24V, RIDE CONTROL 152-8340
(116) VALVE GP - SOLENOID LOAD SENSING 173-7455
(92) VALVE GP PILOT STIC STEERING 249-5615
(38) MOTOR GP HYDRAULIC FAN 213-5268
STEERING
D
(120) VALVE GP STR PMP CNTRL PRESS., FLOW COMP. 176-7520
FAN SPEED
(21) FILTER GP - OIL CASE DRAIN FAN 166-4647
PUMP CASE AIR BLEED
PUMP CASE FILL PORT
(46) PUMP GP STEERING 153-9624
(74) VALVE GP CHECK 9T-1013
(75) VALVE AS CHECK FAN MTR ANTI-CAVITATION 9T-3752
(83) VALVE GP CHECK HYD OIL CLR BY 6E-1454
(119) VALVE GP STR PMP CNTRL PRESS., FLOW COMP. 176-7521
(32) FITTING QUICK DISCONNECT 6V-3965
(110) VALVE GP SHUTTLE 141-1481
C
(58) SWITCH AS PRESSURE FILTER BY 339-4361
(14) COOLER GP HYDRAULIC OIL 164-0058
(107) VALVE GP RIDE CONTROL 259-6275
(66) VALVE 102-4156
E
QUICK DSCNNCT 6V-3965
(84) VALVE GP CHECK, STEERING PILOT 9T-3096 (85) VALVE GP CHECK, STR PLT 104-7108
(2) ACCUMULATOR GP RIDE CONTROL , CA APPROVED 348-9283 RIDE CONTROL , CE APPROVED 259-4694
(72) VALVE FLUID SAMPLING 8C-3446
SOS
AA (31) FITTING
(86) VALVE GP STEERING QUAD 149-4617 (35) MANIFOLD GP CONTROL 322-3793
20) FILTER GP OIL, BRAKE 287-8402
(102) VALVE GP RELIEF, PILOT 276-3650
PRIMARY STEERING PRESS. SWITCH
E
D
F
LL
(99) VALVE GP RLF, LINE RLF TILT CYL. H.E. 117-0160
(97) VALVE GP RLF, LINE RLF LIFT CYL. H.E. 144-0221
G
(71) VALVE - DIVERTER SECONDARY STEERING 2U-7345
(25) FITTING - QUICK DISCONNECT 6V-3965
(87) VALVE GP - CONTROL 2 FUNCTION 222-4436 3 FUNCTION 291-8508 (93) VALVE PRESSURE REDUCING 185-1897
(117) VALVE GP STEERING 301-4599 STEERING, WITH SEC. STR 301-4602
(111) VALVE GP - SHUTTLE PUMP PILOT 4T-1860
(57) SENSOR GP PRESSURE 221-3416
F
PILOT HYDRAULIC CIRCUIT IMPLEMENT PUMP OUTPUT AXLE COOLING FAN PUMP OUTPUT SECONDARY STEERING PUMP OUTPUT TILT CYLINDER CONTROLCIRCUIT STEERING CIRCUIT HYDRAULIC OIL COOLING CIRCUIT SUPPLY LINE BRAKE CIRCUIT AUXILIARY CONTROL CIRCUIT DRAIN / RETURN LINE lIFT CYLINDER CONTROL CIRCUIT CON 305 SUB 651 ELECTRICAL CIRCUITS
(90) VALVE GP FAN PMP CNTRL PRESS., FLOW COMP. 207-0695
(23) FILTER GP - OIL CASE DRAIN STEERING 166-4647
DD
(29) FITTING QUICK DISCONNECT 6V-3965
CC (28) FITTING QUICK DSCNNCT 6V-3965
GG
(112) VALVE GP - SOL 24 VOLT 151-7455
B
(56) SENSOR GP PRESSURE 349-1178 (12) COIL AS 326-5212
HH
(113) VALVE GP - SOL. 24V, HYDRAULIC LOCKOUT 149-2610
(30) FITTING QUICK DSCNNCT 6V-3965 (42) PUMP GP HYDRAULIC FAN 228-3636 HIGH AMB. TEMP 228-3638
PUMP CASE FILL PORT
(27) FITTING QUICK DISCONNECT 6V-3965
(73) VALVE GP CHECK 9T-1013
(70) VALVE BREAKER RELIEF 9T-0818 BREAKER RELIEF EU ATTCH 220-0812
(63) TANK AS HYDRAULIC 153-3602
(34) IMPELLER 146-8990
(52) SCREEN AS 7J-2656
(26) FITTING QUICK DISCONNECT 6V-3965
(50) SCREEN AS 7J-2656 (64) TUBE 1U-1570
(51) SCREEN AS 7J-2656 (48) SCREEN AS 9T-9227
(61) TANK AS 152-3870
22) FILTER GP CASE DRAIN IMPLEMENT PUMP 166-4647
PUMP CASE AIR BLEED
(44) PUMP GP PILOT, BRAKE 177-8924 PILOT, BRAKE, AXLE OIL CLR FAN 258-5060
B
(62) TANK AS EXPANSION 220-2948
(49) SCREEN AS 9T-9227
(43) PUMP GP - IMPLEMENT 346-6095
C
(80) VALVE GP CHECK AIR PURGE 3G-8607
HYDRAC ON/OFF
(91) VALVE GP MANUAL 112-1817
(89) VALVE GP DEMAND FAN 191-8735
(54) SENSOR GP TEMP., HYDR. OIL 288-8390
LINE PATTERNS Pressure Line Pilot / Load Sensing Pressure Drain / Return Lines
(47) SCREEN DIFF 178-0182
Component Group
CALLOUTS YY
Callout Number (Machine Location from Component LocationsTable)
A
Taps (Pressure, Sampling, Sensor - by letter) (52) VALVE GP - CONTROL 138-1234 Part Number
Component Name
988H WHEEL LOADER TIER 3 HYDRAULIC SYSTEM MEDIA NUMBER: UENR1249-02 HYDRAULICS: PART NUMBER: 348-4772, CHANGE: 01, VERSION: AXLE COOLING: PART NUMBER: 260-0866, CHANGE: 00, VERSION: BRAKES: PART NUMBER: 259-3116, CHANGE: 03, VERSION: Components are shown installed on a fully operable machine with the key and engine off, transmission shifter in neutral and with parking brake set. Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
14
13
12
11
10
9
8
7
6
5
4
3
2
1
A
FAN IMPLEMENT AND RIDE CONTROL 3
101 96
KK
25
LL
7
101
93
VIEW ALL CALLOUTS
109
35 II
JJ
BOTTOM VEIW
4
8
100
99
5
67
91
56
27
10
116
21
113 112 HH
LEFT SIDE VEIW
98
66 65
79
97
68
26
69
57
9 6
16
19
88
22
34 12
17 38
14
87
42 2
110
73 RIGHT SIDE VEIW
43
61
63
83
90
74 107
29 DD
39
GG
115
75
30
89
BREAKS AND RAX COOLING VIEW ALL CALLOUTS
24 78 15
NN 55
MM
13 EE
FF 11
82
81
58
77
SOS
60
72 20
37
76 102 59 106
28 114
CC 1
41 80
44
55
AA
31
HYDR. OIL AND EXPANSION TANKS VIEW ALL CALLOUTS
70
62 RIGHT SIDE VEIW
48 51 50 64 49
47 52
STEERING VIEW ALL CALLOUTS
85
54
86
23 32
92
BB
46
33
120 105
119
103 71
108
40
45
111
36
117 104 95 LEFT SIDE VEIW
18
118 84
94
53
40
X
Options
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Features Cover Page
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Information Component Table Tap Table Fluid Power Symbols Electrical Symbols
Schematic Machine Views Front Frame Rear Frame Tap Views
The Bookmarks will allow you to quickly navigate to points of interest. EC-C2 EC-C3
E-C60 E-C61
Click on any text that is BLUE and underlined. These are hyperlinks that can be used to navigate the schematic and machine views.
EC-C1
VIEW ALL CALLOUTS
When only one callout is showing on a machine view this button will make all of the callouts visible. This button is located in the top right corner of every machine view page.
HOTKEYS (Keyboard Shortcuts)
FUNCTION Zoom In Zoom Out Fit to Page Hand Tool Find
KEYS “CTRL” / “+” “CTRL” / “-” “CTRL” / “0” (zero) “SPACEBAR” (hold down) “CTRL” / “F”
UENR1249-02 January 2013
988H Wheel Loader Tier 3 Hydraulic System A7A1-UP BXY4000-UP
© 2013 Caterpillar, All Rights Reserved
Printed in U.S.A.
COMPONENT LOCATION Description
Part Machine Schematic Number Location Location
Description
Part Machine Schematic Number Location Location
Switch As -Pressure, Accumulator Charging
174-4312
59
Switch As -Pressure, Parking Brake Oil
174-4312
60
I-9
Tank As
152-3870
61
A-5
Tank As -Expansion
220-2948
62
B-3
Tank As - Hydraulic
153-3602
63
B-5
D-11
Tube
1U-1570
64
B-4
5
D-13
Valve
6E-1291
65
D-14
217-6719
6
G-11
Valve
102-4156
66
D-10
217-6720
7
E-10
Valve
102-4156
67
D-11
217-6720
8
E-11
Valve
102-4156
68
D-12
Actuator Gp - Pilot Control (Proportional Solenoid), Lower
217-6720
9
E-12
Valve
153-9990
69
G-11
Adapter - Orifice
122-2222
10
F-10
Brake Gp - Parking
174-1552
11
J-8
Valve -Breaker Relief Valve -Breaker Relief (EU Attachment)
9T-0818 220-0812
70
C-3
Coil As
326-5212
12
B-11
Valve - Diverter, Secondary Steering
2U-7345
71
F-5
Control Gp - Foot Brake
169-8258
13
J-11
Valve -Fluid Sampling
8C-3446
72
E-2
Cooler Gp - Hydraulic Oil
164-0058
14
D-2
Valve Gp - Check
9T-1013
73
B-14
Core As - Axle Oil Cooler
173-6753
15
I-2
Valve Gp - Check
9T-1013
74
C-8
Cylinder Gp - Lift, Left Hand Cylinder Gp - Lift, Left Hand (Block Handler)
173-8613 309-9547
16
Valve As - Check, Fan Motor Anti-cavitation
9T-3752
75
D-2
Valve Gp -Accumulator Charging
235-0251
76
H-10
Cylinder Gp - Lift, Right Hand Cylinder Gp - Lift, Right Hand (Block Handler)
173-8612 309-9546
17
Valve Gp -Brake Control, Parking
106-1774
77
J-9
Valve Gp -Brake Control, Service
200-0866
78
I-11
Cylinder Gp - Steering
288-0568
18
Cylinder Gp - Tilt Cylinder Gp - Tilt Cylinder Gp - Tilt (Block Handler)
271-6441 231-1955 309-9545
19
Filter Gp - Oil, Brake
287-8402
20
Filter Gp - Oil, Case Drain (Fan)
166-4647
21
Filter Gp - Oil, Case Drain (Implement Pump)
166-4647
22
Filter Gp - Oil, Case Drain (Steering)
166-4647
Filter Gp - Oil, Screen, Axle Oil Cooler
Accumulator Gp - Brake, CA Approved Accumulator Gp - Brake, CE Approved
350-5576 220-1432
Accumulator Gp - Ride Control, CA Approved Accumulator Gp - Ride Control, CE Approved
348-9283 259-4694
2
D-9
Actuator Gp - Pilot Control (Proportional Solenoid), Aux.
217-6719
3
D-10
Actuator Gp - Pilot Control (Proportional Solenoid), Dump
217-6719
4
Actuator Gp - Pilot Control (Proportional Solenoid), Raise
217-6719
Actuator Gp - Pilot Control (Proportional Solenoid), Tilt Actuator Gp - Pilot Control (Proportional Solenoid), Aux. Actuator Gp - Pilot Control (Proportional Solenoid), Rack
1
I-10
G-13
G-9 G-7
H-9
Valve Gp - Check
4T-5896
79
E-14
Valve Gp - Check, Air Purge
3G-8607
80
C-1
Valve Gp - Check, Axle Oil Cooler Fan Anti-cavitation
9T-5134
81
J-4
Valve Gp - Check, Axle Oil Cooler Fan Anti-cavitation
9T-3752
82
J-3
E-2
Valve Gp - Check, Hydraulic Oil Cooler By
6E-1454
83
D-3
C-3
Valve Gp - Check, Steering Pilot
9T-3096
84
E-6
A-10
Valve Gp - Check, Steering Pilot
104-7108
85
E-6
23
C-5
Valve Gp - Check, Steering Quad
149-4617
86
E-7
230-3633
24
I-5
Fitting (Quick Disconnect), Auxiliary (LL, KK)
6V-3965
25
F-10
Valve Gp - Control, 2 Function Valve Gp - Control, 3 Function
222-4436 291-8508
87
D-10 to F-14
Fitting (Quick Disconnect), Implement Pump Case Air Bleed
6V-3965
26
B-10
Valve Gp - Control, Tilt Regeneration
318-2925
88
G-11
Fitting (Quick Disconnect), Implement Pump Output (HH)
6V-3965
27
B-12
Valve Gp - Demand Fan
191-8735
89
D-1
Fitting (Quick Disconnect), Brake/Pilot Pump Output (CC)
6V-3965
28
C-1
Valve Gp -Fan Pump Control (Pressure, Flow Compensator)
207-0695
90
C-2
Fitting (Quick Disconnect), Fan Pump Load Sense (DD)
6V-3965
29
C-2
Valve Gp -Manual
112-1817
91
C-13
G-10
Fitting (Quick Disconnect), Fan Pump Output (GG)
6V-3965
30
C-3
Valve Gp -Pilot, Stic Steering
249-5615
92
C-7
Fitting (Quick Disconnect), Pilot Supply (AA)
6V-3965
31
E-3
Valve Gp -Pressure Reducing
185-1897
93
F-14
Fitting (Quick Disconnect), Steering Pump Case Air Bleed
6V-3965
32
D-5
Valve Gp -Pressure Reducing, Steering Pilot Oil Regulator
6E-4286
94
F-6
Fitting (Quick Disconnect), Steering Pump Output (BB)
6V-3965
33
D-6
Valve Gp - Relief
6E-6188
95
F-6
Impeller
146-8990
34
B-11
Valve Gp - Relief
334-8332
96
D-10
Manifold Gp - Control
322-3793
35
E-9
Valve Gp - Relief, Line Relief, Lift Cylinder Head End
144-0221
97
E-13
Manifold Gp - Hydraulic
326-3803
36
G-7
Valve Gp - Relief, Line Relief, Lift Cylinder Rod End
129-8293
98
E-13
Motor Gp - Axle Oil Cooler Fan
178-1602
37
I-3
Valve Gp - Relief, Line Relief, Tilt Cylinder Head End
117-0160
99
E-11
Motor Gp - Hydraulic Fan
213-5268
38
D-2
Valve Gp - Relief, Line Relief, Tilt Cylinder Rod End
334-0895
100
E-12
Plug - Orifice
8J-6815
39
D-9
Valve Gp - Relief, Line, Auxiliary
172-5481
101
E-11
Plug - Pipe
1T-0936
40
F-7
Valve Gp - Relief, Pilot
276-3650
102
E-3
Pump Gp - Axle Oil Cooler
292-9912
41
H-5
Valve Gp - Relief, Secondary Steering
6E-3986
103
F-5
Pump Gp - Hydraulic Fan Pump Gp - Hydraulic Fan, High Ambient Temperature
228-3636 228-3638
42
B-2
Valve Gp - Relief, Steering Cylinder Crossover
9T-7419
104
G-6
Valve Gp - Relief, Steering Cylinder Crossover
9T-7419
105
F-7
Pump Gp - Implement
346-6095
43
B-12
Valve Gp - Relief, Steering Implement, Pilot
276-3649
106
E-3
Pump Gp - Pilot, Brake Pump Gp - Pilot, Brake, Axle Oil Cooler Fan
177-8924 258-5060
44
B-1
Valve Gp - Ride Control
259-6275
107
D-9
Valve Gp -Selector and Pressure Control (Secondary Steering)
6E-5566
108
E-6
Pump Gp - Secondary Steering
150-7585
45
E-5
Valve Gp -Shuttle
4T-1860
109
F-14
Pump Gp - Steering
153-9624
46
D-6
Valve Gp -Shuttle
141-1481
110
C-8
Screen - Diff
178-0182
47
B-4
Valve Gp -Shuttle, Pump Pilot
4T-1860
111
F-6
Screen As
9T-9227
48
B-4
Valve Gp -Solenoid, 24 Volt
151-7455
112
B-14
Screen As
9T-9227
49
B-5
Valve Gp -Solenoid, 24 Volt, Hydraulic Lockout
149-2610
113
B-14
Screen As
7J-2656
50
B-4
Valve Gp -Solenoid, 24 Volt, Axle Oil Cooler
149-2610
114
J-4
Screen As
7J-2656
51
B-4
Valve Gp -Solenoid, 24 Volt, Ride Control
152-8340
115
C-9
Screen As
7J-2656
52
B-5
Valve Gp -Solenoid, Load Sensing
173-7455
116
C-13
Screen As
307-6457
53
F-7
Sensor Gp - Temperature, Hydraulic Oil
288-8390
54
B-3
Valve Gp -Steering Valve Gp -Steering, With Secondary Steering)
301-4599 301-4602
117
G-5
Sensor Gp - Temperature, Axle Oil
131-0427
55
J-13
Valve Gp -Steering Neutralizer
296-5662
118
D-7
Sensor Gp - Pressure
349-1178
56
B-12
Valve Gp -Steering Pump Control (Press., Flow Compensator)
176-7521
119
D-5
Sensor Gp - Pressure, Lift Cylinder Rod End
221-3416
57
F-9
Valve Gp -Steering Pump Control (Press., Flow Compensator)
176-7520
120
C-5
Switch As - Pressure, Filter By
339-4361
58
E-2
TAP LOCATION Tap Number
Description
Schematic Location
AA
Pilot Supply
E-3
BB
Steering Pump Cutoff
D-6
CC
Brake Charge
C-1
DD
Fan Drive Signal
C-2
EE
Front Brake Supply
I-10
FF
Rear Brake Supply
I-11
GG
Fan Drive Supply
C-2
HH
Main System Relief
B-12
II
Tilt, Rod End Line Relief
F-12
JJ
Tilt, Head End Line Relief
F-12
KK
Auxiliary Line Relief
F-11
LL
Auxiliary Line Relief
F-11
MM
Front Brake Pressure
I-13
NN
Rear Brake Pressure
I-13
Fluid Sampling Port
E-2
SOS
FLUID POWER SYMBOLS BASIC COMPONENT SYMBOLS
MAIN AUX.
PUMP or MOTOR
SPRING (ADJUSTABLE)
VARIABILITY
CONTROL VALVES
SPRING
FLUID CONDITIONER
PRESSURE COMPENSATION
LINE RESTRICTION (VARIABLE)
TWO POSITION
2-SECTION PUMP
HYDRAULIC PNEUMATIC ENERGY TRIANGLES
ATTACHMENT
LINE RESTRICTION
VALVE PORTS
TWO-WAY
THREE POSITION
PUMP: VARIABLE and PRESSURE COMPENSATED
VARIABLE and PRESSURE COMPENSATED
VALVES
VALVE ENVELOPES
ONE POSITION
LINE RESTRICTION (FIXED)
RESTRICTION
FOUR-WAY
THREE-WAY
CONTROL VALVES
CHECK VALVES
AB
AB
P T NORMAL POSITION
P T SHIFTED POSITION
INFINITE POSITION
SHUTTLE
SPRING LOADED
BASIC SYMBOL
PILOT CONTROLLED
FLUID STORAGE RESERVOIRS
VENTED
RETURN ABOVE FLUID LEVEL
PRESSURIZED
RETURN BELOW FLUID LEVEL
MEASUREMENT
PRESSURE
TEMPERATURE
ROTATING SHAFTS
FLOW
UNIDIRECTIONAL
BIDIRECTIONAL
COMBINATION CONTROLS
SOLENOID
SOLENOID or MANUAL
SOLENOID and PILOT or MANUAL
SOLENOID and PILOT
SERVO
DETENT
THERMAL
MANUAL CONTROL SYMBOLS
MANUAL SHUTOFF
PUSH-PULL LEVER
RELEASED PRESSURE
EXTERNAL RETURN
SPRING LOADED
HYDRAULIC PUMPS VARIABLE DISPLACEMENT NON-COMPENSATED
PEDAL
LINES CROSSING
LINES ING
VARIABLE DISPLACEMENT NON-COMPENSATED
UNIDIRECTIONAL
UNIDIRECTIONAL
BIDIRECTIONAL
BIDIRECTIONAL
INTERNAL SUPPLY PRESSURE
COMPLETE
HYDRAULIC AND PNEUMATIC CYLINDERS
SINGLE ACTING
DOUBLE ACTING
INTERNAL AGEWAYS
HYDRAULIC MOTORS FIXED DISPLACEMENT
SPRING
REMOTE SUPPLY PRESSURE
SIMPLIFIED
CROSSING AND ING LINES
GAS CHARGED
PUSH BUTTON
PILOT CONTROL SYMBOLS
INTERNAL RETURN
ACCUMULATORS
FIXED DISPLACEMENT
GENERAL MANUAL
INFINITE POSITIONING
FLOW IN ONE DIRECTION
THREE POSITION
PARALLEL FLOW
CROSS FLOW
TWO POSITION
FLOW ALLOWED IN EITHER DIRECTION
ELECTRICAL SYMBOLS Hydraulic Symbols (Electrical)
G Transducer (Fluid)
Transducer (Gas / Air)
Pressure Switch (Adjustable)
Pressure Switch
M
Generator
Electric Motor
Electrical Wire
Temperature Switch
Electrical Symbols (Electrical)
T
Pressure Symbol
Temperature Symbol
Level Symbol
Flow Symbol
Wire Number Identification Codes
Electrical Schematic Example
Hydraulic Schematic Example Current Standard
Current Standard Harness identification code This example indicates wire 135 in harness "AG".
Wire Circuit Number Identification
Wire Color
325-AG135 PK-14 325-PK Circuit Identification Number
Wire Color
Wire Gauge
Previous Standard Wire Color
Wire
325-PK-14 B Circuit Number Identification
A
Wire Gauge (EXAMPLE VALVE)
14
13
12
11
10
8
9
7
6
5
4
3
2
1
(114) VALVE GP - SOLENOID 24V, AXLE OIL COOLER 149-2610
FRONT AXLE IMPELLER CLUTCH PEDAL POSITION SIGNAL (TO TRANSMISSION CONTROL)
J
(13) CONTROL GP FOOT BRAKE 169-8258
STOPLAMP SW
J (11) BRAKE GP PARKING 174-1552
(77) VALVE GP BRAKE CONTROL, PARKING 106-1774
THROTTLE LOCK DISCONNECT SW
REAR AXLE
HITCH (55) SENSOR GP TEMP., AXLE OIL 131-0427
NN
AXLE OIL FAN RETURN
(81) VALVE GP - CHECK AXLE OIL COOLER FAN ANTI-CAVITATION 9T-5134
TRANSMISSION CONTROL NC
NO
(82) VALVE GP - CHECK AXLE OIL COOLER FAN ANTI-CAVITATION 9T-3752
FRONT
PARKING BRAKE INDICATION SW
24) FILTER GP - OIL AXLE OIL COOLER 230-3633
C
MM
(78) VALVE GP BRAKE CONTROL, SERVICE 200-0866
I
(60) SWITCH AS PRESSURE, PARKING BRAKE OIL 174-4312
(1) ACCUMULATOR GP BRAKE, CA APPROVED 350-5576 BRAKE, CE APPROVED 220-1432
TRANSMISSION CONTROL
(15) CORE AS AXLE OIL COOLER 173-6753
(37) MOTOR GP AXLE OIL COOLER FAN 178-1602
I
EE
FF REAR AXLE
(59) SWITCH AS PRESSURE, ACCUMULATOR CHARGING 174-4312
(41) PUMP GP AXLE OIL COOLER 292-9912
BRAKE ACCUM PRESS. SWITCH
AXLE OIL FAN SUPPLY
(76) VALVE GP ACCUMULATOR CHARGING 235-0251 H
H
AXLE COOLING SYSTEM
BRAKE SYSTEM
(18) CYLINDER GP STEERING 288-0568
TILT CYLINDER LIFT CYLINDER G (16) CYLINDER GP LIFT, LEFT HAND 173-8613 LIFT, LEFT HAND BLOCKER HANDLER 309-9547
(88) VALVE GP - CONTROL TILT REGENERATION 318-2925
(19) CYLINDER GP TILT 271-6441 TILT 231-1955 TILT BLOCKER HANDLER 309-9546
RIGHT TURN
LIFT CYLINDER
STEERING CYLINDER
(104) VALVE GP - RELIEF STEERING CYL. CROSSOVER 9T-7419
(17) CYLINDER GP LIFT, RIGHT HAND 173-8612 LIFT, RIGHT HAND BLOCKER HANDLER 309-9546
(69) VALVE 153-9990
(6) ACTUATOR GPPILOT CONTROL PROPORTIONAL SOL. 217-6719
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS (36) MANIFOLD GP HYDRAULIC 326-3803
(105) VALVE GP - RELIEF STEERING CYL. CROSSOVER 9T-7419
(10) ADAPTER ORIFICE 122-2222
(109) VALVE SHUTTLE 4T-1860
(98) VALVE GP RLF, LINE RLF LIFT CYL. R.E. 129-8293
II
JJ
KK
(95) VALVE GP - RELIEF 6E-6188 (103) VALVE GP - RELIEF SECONDARY STEERING 6E-3986
(94) VALVE GP PRESSURE REDUCING STR PILOT OIL REG. 6E-4286 (101) VALVE GP RLF, LINE, AUX. 172-5481
(53) SCREEN AS 307-6457
(40) PLUG - PIPE 1T-0936
(100) VALVE GP RLF, LINE RLF TILT CYL. R.E. 334-0895
(79) VALVE - CHECK 4T-5896
(108) VALVE GP SEL./ PRESS. CNTRL (SEC. STR) 6E-5566
AXLE OIL FAN RETURN
(45) PUMP GP SECONDARY STEERING 150-7585
(106) VALVE GP RELIEF, STEERING IMPLEMENT, PILOT 276-3649
LOWER
(9) ACTUATOR GPPILOT CONTROL PROPORTIONAL SOL. 217-6720
(8) ACTUATOR GPPILOT CONTROL PROPORTIONAL SOL. 217-6720
RACK
(68) VALVE 102-4156
(7) ACTUATOR GPPILOT CONTROL PROPORTIONAL SOL. 217-6720
(96) VALVE GP RELIEF 334-8332
(67) VALVE 102-4156
RIGHT NEUT
LEFT NEUT
(39) PLUG - ORIFICE 8J-6815
(65) VALVE 6E-1291
RAISE
DUMP
(5) ACTUATOR GP PILOT CONTROL PROPORTIONAL SOL 217-6719
(4) ACTUATOR GP PILOT CONTROL PROPORTIONAL SOL. 217-6719
(33) FITTING QUICK DISCONNECT 6V-3965
(118) VALVE GP STEERING NEUTRALIZER 296-5662
RIDE CONT
(3) ACTUATOR GPPILOT CONTROL PROPORTIONAL SOL. 217-6719
BB (115) VALVE GP - SOL. 24V, RIDE CONTROL 152-8340
(116) VALVE GP - SOLENOID LOAD SENSING 173-7455
(92) VALVE GP PILOT STIC STEERING 249-5615
(38) MOTOR GP HYDRAULIC FAN 213-5268
STEERING
D
(120) VALVE GP STR PMP CNTRL PRESS., FLOW COMP. 176-7520
FAN SPEED
(21) FILTER GP - OIL CASE DRAIN FAN 166-4647
PUMP CASE AIR BLEED
PUMP CASE FILL PORT
(46) PUMP GP STEERING 153-9624
(74) VALVE GP CHECK 9T-1013
(75) VALVE AS CHECK FAN MTR ANTI-CAVITATION 9T-3752
(83) VALVE GP CHECK HYD OIL CLR BY 6E-1454
(119) VALVE GP STR PMP CNTRL PRESS., FLOW COMP. 176-7521
(32) FITTING QUICK DISCONNECT 6V-3965
(110) VALVE GP SHUTTLE 141-1481
C
(58) SWITCH AS PRESSURE FILTER BY 339-4361
(14) COOLER GP HYDRAULIC OIL 164-0058
(107) VALVE GP RIDE CONTROL 259-6275
(66) VALVE 102-4156
E
QUICK DSCNNCT 6V-3965
(84) VALVE GP CHECK, STEERING PILOT 9T-3096 (85) VALVE GP CHECK, STR PLT 104-7108
(2) ACCUMULATOR GP RIDE CONTROL , CA APPROVED 348-9283 RIDE CONTROL , CE APPROVED 259-4694
(72) VALVE FLUID SAMPLING 8C-3446
SOS
AA (31) FITTING
(86) VALVE GP STEERING QUAD 149-4617 (35) MANIFOLD GP CONTROL 322-3793
20) FILTER GP OIL, BRAKE 287-8402
(102) VALVE GP RELIEF, PILOT 276-3650
PRIMARY STEERING PRESS. SWITCH
E
D
F
LL
(99) VALVE GP RLF, LINE RLF TILT CYL. H.E. 117-0160
(97) VALVE GP RLF, LINE RLF LIFT CYL. H.E. 144-0221
G
(71) VALVE - DIVERTER SECONDARY STEERING 2U-7345
(25) FITTING - QUICK DISCONNECT 6V-3965
(87) VALVE GP - CONTROL 2 FUNCTION 222-4436 3 FUNCTION 291-8508 (93) VALVE PRESSURE REDUCING 185-1897
(117) VALVE GP STEERING 301-4599 STEERING, WITH SEC. STR 301-4602
(111) VALVE GP - SHUTTLE PUMP PILOT 4T-1860
(57) SENSOR GP PRESSURE 221-3416
F
PILOT HYDRAULIC CIRCUIT IMPLEMENT PUMP OUTPUT AXLE COOLING FAN PUMP OUTPUT SECONDARY STEERING PUMP OUTPUT TILT CYLINDER CONTROLCIRCUIT STEERING CIRCUIT HYDRAULIC OIL COOLING CIRCUIT SUPPLY LINE BRAKE CIRCUIT AUXILIARY CONTROL CIRCUIT DRAIN / RETURN LINE lIFT CYLINDER CONTROL CIRCUIT CON 305 SUB 651 ELECTRICAL CIRCUITS
(90) VALVE GP FAN PMP CNTRL PRESS., FLOW COMP. 207-0695
(23) FILTER GP - OIL CASE DRAIN STEERING 166-4647
DD
(29) FITTING QUICK DISCONNECT 6V-3965
CC (28) FITTING QUICK DSCNNCT 6V-3965
GG
(112) VALVE GP - SOL 24 VOLT 151-7455
B
(56) SENSOR GP PRESSURE 349-1178 (12) COIL AS 326-5212
HH
(113) VALVE GP - SOL. 24V, HYDRAULIC LOCKOUT 149-2610
(30) FITTING QUICK DSCNNCT 6V-3965 (42) PUMP GP HYDRAULIC FAN 228-3636 HIGH AMB. TEMP 228-3638
PUMP CASE FILL PORT
(27) FITTING QUICK DISCONNECT 6V-3965
(73) VALVE GP CHECK 9T-1013
(70) VALVE BREAKER RELIEF 9T-0818 BREAKER RELIEF EU ATTCH 220-0812
(63) TANK AS HYDRAULIC 153-3602
(34) IMPELLER 146-8990
(52) SCREEN AS 7J-2656
(26) FITTING QUICK DISCONNECT 6V-3965
(50) SCREEN AS 7J-2656 (64) TUBE 1U-1570
(51) SCREEN AS 7J-2656 (48) SCREEN AS 9T-9227
(61) TANK AS 152-3870
22) FILTER GP CASE DRAIN IMPLEMENT PUMP 166-4647
PUMP CASE AIR BLEED
(44) PUMP GP PILOT, BRAKE 177-8924 PILOT, BRAKE, AXLE OIL CLR FAN 258-5060
B
(62) TANK AS EXPANSION 220-2948
(49) SCREEN AS 9T-9227
(43) PUMP GP - IMPLEMENT 346-6095
C
(80) VALVE GP CHECK AIR PURGE 3G-8607
HYDRAC ON/OFF
(91) VALVE GP MANUAL 112-1817
(89) VALVE GP DEMAND FAN 191-8735
(54) SENSOR GP TEMP., HYDR. OIL 288-8390
LINE PATTERNS Pressure Line Pilot / Load Sensing Pressure Drain / Return Lines
(47) SCREEN DIFF 178-0182
Component Group
CALLOUTS YY
Callout Number (Machine Location from Component LocationsTable)
A
Taps (Pressure, Sampling, Sensor - by letter) (52) VALVE GP - CONTROL 138-1234 Part Number
Component Name
988H WHEEL LOADER TIER 3 HYDRAULIC SYSTEM MEDIA NUMBER: UENR1249-02 HYDRAULICS: PART NUMBER: 348-4772, CHANGE: 01, VERSION: AXLE COOLING: PART NUMBER: 260-0866, CHANGE: 00, VERSION: BRAKES: PART NUMBER: 259-3116, CHANGE: 03, VERSION: Components are shown installed on a fully operable machine with the key and engine off, transmission shifter in neutral and with parking brake set. Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
14
13
12
11
10
9
8
7
6
5
4
3
2
1
A
FAN IMPLEMENT AND RIDE CONTROL 3
101 96
KK
25
LL
7
101
93
VIEW ALL CALLOUTS
109
35 II
JJ
BOTTOM VEIW
4
8
100
99
5
67
91
56
27
10
116
21
113 112 HH
LEFT SIDE VEIW
98
66 65
79
97
68
26
69
57
9 6
16
19
88
22
34 12
17 38
14
87
42 2
110
73 RIGHT SIDE VEIW
43
61
63
83
90
74 107
29 DD
39
GG
115
75
30
89
BREAKS AND RAX COOLING VIEW ALL CALLOUTS
24 78 15
NN 55
MM
13 EE
FF 11
82
81
58
77
SOS
60
72 20
37
76 102 59 106
28 114
CC 1
41 80
44
55
AA
31
HYDR. OIL AND EXPANSION TANKS VIEW ALL CALLOUTS
70
62 RIGHT SIDE VEIW
48 51 50 64 49
47 52
STEERING VIEW ALL CALLOUTS
85
54
86
23 32
92
BB
46
33
120 105
119
103 71
108
40
45
111
36
117 104 95 LEFT SIDE VEIW
18
118 84
94
53
40
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