INTERACTIVE SCHEMATIC
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Tap Table
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X
EC-C3
EC-C2
E-C60
EC-C1
E-C61
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Hydraulic System
994F Wheel Loader
©
2005 Caterpillar, All Rights Reserved
Printed in U.S.A.
RENR6320-00
July 2005
Volume 1: Steering and Brake System
Volume 2: Implement System
442 1-UP
Volume 1 of 2 - STEERING AND
BRAKE SYSTEM, Page 1 of 2
COMPONENT LOCATION
Item
Number
Description
N
Part
umber
Schematic
Location
1 Tank Group - Steer/Brake 248-2583 A-3
2 Pump Group - Steering 263-5065 B-7
3 Valve Group 6E-1024 C-7, C-5
4 Pump Group - Steering 6E-0868 E-5
5 Plug - Orifice 6L-9716 D-8
6 Valve Group - Relief 6E-0859 E-8
7 Valve Group - Neutralizer (Left and Right) 9T-7426 C-8
8 Valve Group 149-4617 D-8
9 Cylinder Group - Right 9T-9019 F-8
10 Valve Group - Reducing 1U-2226 A-8, A-7
11 Switch Assembly 224-8497 B-7
13 Pump Group - Cooler/Filter 6E-0867 B-3
14 Filter Group 6E-0874 C-3
15 Valve Group - Cooler Bypass 264-6867 D-3
16 Core Group - Oil Cooler 186-0059 D-3
17 Pump Group - Steering 263-5064 C-5
19 Cylinder Group - Left 6E-0529 F-8
20 Valve Group - Check 6E-1252 C-6
21 Fitting - Orifice 110-0778 A-7
22 Connector - Orifice 8C-0564 D-7
23 Screen Group 251-2451 C-6, D-6
24 Switch Assembly 117-7773 A-6
25 Filter Group 115-2129 A-6
26 Valve Group - Steering 154-5236 E-8
27 Valve 9J-8225 D-7
28 Valve Group - Shuttle 4T-1860 E-8
29 Valve Group - Diverter 163-5465 E-5
30 Valve Group - Relief 9J-0460 E-6
Volume 1 of 2 - STEERING AND
BRAKE SYSTEM, Page 2 of 2
COMPONENT LOCATION
Item
Number
Description
N
Part
umber
Schematic
Location
31 Valve Group 249-5615 B-8
32 Screen Assembly 9T-9227 A-4
33 Screen Assembly 7J-2656 A-4
34 Connector - Orifice 143-4218 A-7
35 Filter 9T-1119 B-3, A-2
36 Pump Group - Brake Cooling 116-7341 A-2
37 Valve Group - Check 104-7108 C-2
38 Accumulator Group - Brake 219-4707 C-2
39 Core Group - Oil Cooler 9Y-8890 B-2
40 Valve Group - Check 122-3359 B-2
41 Valve Group - Check 9T-3752 B-2, C-1, C-2, B-1
42 Screen Group 164-3306 B-2, B-1, C-2, C-1
43 Brakes C-2, C-1
44 Pump Group - Brake 102-4226 B-3
45 Valve Group - Check 9T-6005 C-3
46 Tank Group - Brake Cooling 248-2584 A-2
47 Switch Assembly - Liquid Level 172-8660 A-3
48 Sensor Group - Temperature 118-7226 A-1, A-5
49 Switch Assembly 144-5661 D-3
Brake System
50
Switch - Limit 171-7805 F-2
51 Switch - Pressure 175-3244 E-2
52 Valve - Tandem Brake 247-1295 E-3
53 Foot Brake Control 250-9458 F-4
54 Valve - Park Brake Control 106-1774 E-1
55 Switch - Park Brake Indicator Pressure 174-4312 F-1
56 Parking Brake 116-1339 F-2
57 Valve - Back Pressure Check Valve 243-2652 E-1
N/A
Volume 2 of 2 - IMPLEMENT SYSTEM,
Page 1 of 2
COMPONENT LOCATION
Item
Numb
er
Descrip
tion
Part
Number
Schematic
Location
1
Pump Group - Tandem 245-8893 C-6
2 Pump Group - Implement 124-3761 B-6, C-6
3 Tank - Expansion 227-5147 A-4
4 Valve 102-4156 B-4, C-4, D-5, C-5
5 Valve Group - Relief 143-8912 B-4, C-4, D-5, C-5
6 Screen Group 251-2451 B-5, C-5, D-5
7 Filter Group 115-2129 B-6, C-6, D-6, C-7
8 Switch Assembly 117-7773 B-7, C-7, D-7, C-8
9 Valve Group - Control 241-4821 D-2
10 Valve Group - Relief 142-4281 C-2
11 Valve Group - Relief 9T-9197 C-2
12 Valve Group - Relief 248-0020 C-2
13 Valve - Check 6E-1291 B-2
14 Valve Group - Control 241-4822 C-3
16 Valve - Check 119-0913 B-3
Cylinder Group - Lift (Std) 193-4076
17
Cylinder Group - Lift (High) 193-4075 C-1
Cylinder Group - Lift (Super High) 247-4565
Cylinder Group - Tilt RH (Std) 112-3171
18
Cylinder Group - Tilt RH (High) 219-6273 D-1
Cylinder Group - Tilt RH (Super High) 251-2005
Cylinder Group - Tilt LH (Std) 112-3172
19
Cylinder Group - Tilt LH (High) 219-6272 D-1
Cylinder Group - Tilt LH (Super High) 247-4566
20
Pump Group 245-0963 C-7
21 Valve Group - Relief 245-4788 D-8
22 Valve Group - Check 6E-5444 D-8
23 Valve Group - Check 9T-3096 D-8
24 Valve Group - Selector 119-5988 D-8
Volume 2 of 2 - IMPLEMENT SYSTEM,
Page 2 of 2
COMPONENT LOCATION
Item
Numb
er
Descrip
tion
Part
Number
Schematic
Location
25 Valve Group - Pilot 177-4104 F-7
26 Valve Group - Selector 140-8243 E-4, E-5
27 Connector - Orifice 4I-6206 E-4, E-5
28 Valve Group - Relief 245-4891 B-7
29 Filter Group 6E-0874 B-8
30 Cooler 186-0058 B-8
31 Valve Group - Check 264-6867 B-8
32 Tank Group 248-2585 A-7
33 Screen Assembly 9T-9227 A-5, A-6, A-7
34 Screen Group 7J-2656 A-6
35 Gage - Liquid Level 147-9580 A-5
36 Valve Group - Breaker and Relief 133-1963 A-2
37 Valve Group - Breaker and Relief 220-0812 A-3
38 Tank - Expansion 251-1073 A-3
40 Sensor Group - Pressure 3E-6934 B-1
41 Switch Assembly - Liquid Level 172-8660 A-5
42 Sensor Group - Temperature 118-7226 A-7
44 Valve Group - Sequence 246-0923 D-6
45 Valve Group - Solenoid 147-1223 E-6
46 Valve Group - Solenoid 152-8385 E-6
47 Connector 260-9227 E-7
48 Valve Group - (Relief and Check) 247-2973 B-4, C-4, D-5, C-5
49 Sensor Group - Pressure 221-3405 C-5
50 Connector Assembly 222-6869 B-1, C-5
51 Switch Assembly 144-5661 B-8
Volume 1 of 2 - STEERING AND
BRAKE SYSTEM
TAP LOCATION
Tap
Number
Description
Schematic
Location
AA STEERING CYLINDER PRESSURE (LEFT) E-8
BB STEERING CYLINDER PRESSURE (RIGHT) E-8
CC LEFT STEERING PUMP PRESSURE C-7
DD RIGHT STEERING PUMP PRESSURE D-5
EE STEERING COOLING PUMP PRESSURE C-3
FF REAR BRAKE ACCUMULATOR PRESSURE E-1
GG FRONT BRAKE ACCUMULATOR PRESSURE E-1
HH BRAKE COOLING PUMP PRESSURE B-2
JJ FRONT BRAKE PRESSURE D-2
KK REAR BRAKE PRESSURE D-2
LL OIL SAMPLE PORT (SOS) C-3
Volume 2 of 2 - IMPLEMENT SYSTEM
TAP LOCATION
Tap
Number
Description
Schematic
Location
AA Implement Oil Cooling Pump Pressure C-8
BB Implement Pilot Pump Pressure E-8
CC Left Fixed Displacement Pump Pressure D-5
DD Right Fixed Displacement Pump Pressure B-4
EE Center Variable Displacement Pump Pressure C-4
FF Center Fixed Displacement Pump Pressure D-5
GG Tilt Rod End Pressure D-1
HH Tilt Head End Pressure D-1
JJ Lift Head End Pressure B-2
KK Lift Rod End Pressure B-1
FLUID POWER SYMBOLS
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)
VARIABILITY
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 PEDALGENERAL 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
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 ACTINGSINGLE 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
A B
P T
A B
P T
SHIFTED POSITION
INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOT
CONTROLLED
ELECTRICAL SYMBOLS
Hydraulic Symbols (Electrical)
325-AG135 PK-14
Circuit Identification
Number
Wire Color
Wire Gauge
Harness identification code
This example indicates
wire 135 in harness "AG".
325-PK-14
Wire Gauge
Wire Color
Circuit Number
Identification
Wire Number Identification Codes
Current Standard
Previous Standard
Electrical Schematic Example
Hydraulic Schematic Example
325-PK
Wire Color
Circuit Number
Identification
B
A
Wire
Wire
(EXAMPLE VALVE)
Current Standard
Transducer
(Fluid)
Transducer
(Gas / Air)
G
Generator
Electrical Wire
Pressure Switch
M
Electric Motor
Pressure Switch
(Adjustable)
Temperature Switch
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
Electrical Symbols (Electrical)
T
DRAIN / RETURN LINE
LINES GROUP COLOR DESCRIPTIONS
BRAKE CIRCUIT
STEERING CIRCUIT
STIC STEER CIRCUIT
BRAKE COOLING CIRCUIT
SUPPLY LINE
SECONDARY STEERING CIRCUIT
PARKING BRAKE CIRCUIT
STEERING CYLINDERS
THIS SCHEMATIC IS FOR THE 994F WHEEL LOADER STEERING AND BRAKE SYSTEM
Part #: 246-8025 CHG 03 and 248-2712 CHG 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
CALLOUTS
Taps (Pressure, Sampling,Sensor) by letter
Components by number
YY
52
STEERING
CYLINDERS
LEFTRIGHT
STIC STEER
PS
HS
PS
HS
BRAKE RETURN
FRONT BRAKE SUPPLY
REAR BRAKE SUPPLY
PARKING BRAKE TRANSMISSION
INTERLOCK OVERRIDE SW
STOPLAMP SW
IMPELLER CLUTCH PEDAL
POSITION SIGNAL
(TO TRANSMISSION CONTROL)
BRAKE SYSTEM SCHEMATIC
BB
AA
DD
LL
EE
HH
JJ
CC
GG
KK
(19)
CYLINDER GP
LEFT
6E-0529
3
4
56
7
8
A
C
D
23
4
56
7
8
A
B
C
D
E
F
B
1
2
3
4
56
7
8
A
C
D
E
F
1
23
4
56
7
8
A
B
C
D
E
F
B
(6)
VALVE GP
RELIEF
6E-0859
(28)
VALVE GP
SHUTTLE
4T-1860
(26)
VALVE GP
STEERING
154-5236
(8)
VALVE GP
149-4617
(5)
PLUG - ORIFICE
149-4617
(7)
VALVE GP
NEUTRALIZER
(LEFT AND RIGHT)
9T-7426
(31)
VALVE GP
249-5615
(10)
VALVE GP
REDUCING
1U-2226
(10)
VALVE GP
REDUCING
1U-2226
(21)
FITTING
ORIFICE
110-0778
(34)
CONNECTOR
ORIFICE
143-4218
(11)
SWITCHAS
224-8497
(2)
PUMP GP
STEERING
263-5065
(3)
VALVE GP
6E-1024
(23) SCREEN
GP
251-2451
(27)
VALVE
9J-8225
(22)
CONN
ORIFICE
8C-0564
(9)
CYLINDER GP
RIGHT
9T-9019
(30)
VALVE GP
RELIEF
9J-0460
(23) SCREEN
GP
251-2451
(20) VALVE
GP
CHECK
6E-1252
(20) VALVE
GP
CHECK
6E-1252
(25) FILTER
GP
115-2129
(24) SWITCH AS
117-7773
(48) SENSOR
GP
TEMPERATURE
118-7226
(17) PUMP
GP
STEERING
6E-1252
(3)
VALVE GP
6E-1024
(4) PUMP
GP
STEERING
6E-0868
(29)
VALVE GP
DIVERTER
163-5465
(53)
FOOT BRAKE
CONTROL
250-9458
(32) SCREEN
AS
9T-9227
(33) SCREEN
AS
7J-2656
(1) TANK GP
STEER/BRAKE
248-2583
(47) SWITCH AS
LIQUID LEVEL
172-8660
(35) FILTER
9T-1119
(13) PUMP GP
COOLER/FILTER
6E-0867
(44) PUMP GP
BRAKE
102-4226
(14) FILTER GP
6E-0874
(45) VALVE GP
CHECK
9T-6005
(16) CORE GP
OIL COOLER
186-0059
(15) VALVE GP
COOLER BYPASS
264-6867
(49) SWITCH AS
144-5661
(52)
VALVE
TANDEM BRAKE
247-1259
(56) PARKING
BRAKE
116-1339
(50) SWITCH- LIMIT
171-7805
(51) SWITCH
PRESSURE
175-3244
(41) VALVE GP
CHECK
9T-3752
(42) SCREEN GP
164-3306
(43) BRAKES
N/A
(43) BRAKES
N/A
(42) SCREEN GP
164-3306
(41) VALVE GP
CHECK
9T-3752
(39) CORE GP
OIL COOLER
9Y-8890
(40) VALVE GP
CHECK
122-3359
(35) FILTER
9T-1119
(46) TANK GP
BRAKE COOLING
122-3359
(47) SWITCH AS
LIQUID LEVEL
172-8660
(48) SENSOR
GP
TEMPERATURE
118-7226
(36) PUMP
GP
BRAKE COOLING
116-7341
FF
(55) SWITCH
PARK BRAKE INDICATOR PRESSURE
174-4312
(54) VALVE
PARK BRAKE CONTROL
106-1774
(57) VALVE
BACK PRESSURE
CHECK VALVE
243-2652
(37) VALVE
GP
CHECK
104-7108
(38) ACCUM
GP
BRAKE
219-4707
1
2
3
4
56
7
8
C
D
E
F
23
4
56
7
8
A
B
C
D
E
F
B
A
1
DRAIN / RETURN LINE
LINES GROUP COLOR DESCRIPTIONS
IMPLEMENT PUMP CIRCUIT (LEFT)
PILOT PUMP OUTPUT
OIL COOLING CIRCUIT
IMPLEMENT PUMP CIRCUIT (CENTER REAR)
SUPPLY LINE
IMPLEMENT PUMP CIRCUIT (RIGHT)
IMPLEMENT PUMP CIRCUIT (CENTER FRONT)
CENTER
FRONT
LEFT
RIGHT
CENTER
REAR
LEVER LOCKS
LIFTTILT
PS
HS
RAISELOWER
RACKBACKDUMP
ADDITIONAL
RAISE LOWER
RACKBACK DUMP
LOWER
RAISE
DUMP
RACKBACK
AA
THIS SCHEMATIC IS FOR THE 994F WHEEL LOADER: IMPLEMENT SYSTEM
PART #: 246-8028 CHG 03 (VOLUME 2 of 2)
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
CALLOUTS
Taps (Pressure, Sampling,Sensor) by letter
Components by number
YY
52
BB
CC
FF
EE
DD
JJ
LEFT
RIGHT
CENTER
REAR
CENTER
FRONT
GG
KK
HH
RIGHT SIDE LEFT SIDE
(23)
VALVE GP
CHECK
9T-3096
(22)
VALVE GP
CHECK
6E-5444
(21)
VALVE GP
RELIEF
245-4788
(8)
SWITCH AS
117-7773
(20)
PUMP GP
245-0963
(29)
FILTER GP
6E-0874
(51)
SWITCH AS
144-5661
(30)
COOLER
186-0058
(42)
SENSOR GP
TEMPERATURE
118-7226
(32)
TANK GP
248-2585
(33)
SCREEN AS
9T-9227
(8)
SWITCH AS
117-7773
(8)
SWITCH AS
117-7773
(7)
FILTER GP
115-2129
(24)
VALVE GP
SELECTOR
119-5988
(47)
CONNECTOR
260-9227
(25)
VALVE GP
PILOT
177-4104
(46)
VALVE GP
SOLENOID
152-8385
(45)
VALVE GP
SOLENOID
147-1223
(44)
VALVE GP
SEQUENCE
246-0923
(6)
SCREEN GP
251-2451
(2)
PUMP GP
IMPLEMENT
124-3761
(6)
SCREEN GP
251-2451
(7)
FILTER GP
115-2129
(7)
FILTER GP
115-2129
(7)
FILTER GP
115-2129
(7)
FILTER GP
115-2129
(2)
PUMP GP
IMPLEMENT
124-3761
(33)
SCREEN AS
9T-9227
(33)
SCREEN AS
9T-9227
(34)
SCREEN GP
7J-2656
(41)
SWITCH AS
LIQUID LEVEL
172-8660
(35)
GAGE
LIQUID LEVEL
147-9580
(1)
PUMP GP
TANDEM
245-8893
(6)
SCREEN GP
251-2451
(49)
SENSOR GP
PRESSURE
221-3405
(50)
CONN AS
222-6869
(4)
VALVE
102-4156
(4)
VALVE
102-4156
(48)
VALVE GP
(RELIEF AND CHECK)
247-2973
(48)
VALVE GP
(RELIEF AND
CHECK)
247-2973
(27)
CONN
ORIFICE
4I-6206
(27)
CONN
ORIFICE
4I-6206
(26)
VALVE GP
SELECTOR
140-8243
(4)
VALVE
102-4156
(48)
VALVE GP
(RELIEF AND
CHECK)
247-2973
(3)
TANK
EXPANSION
227-5147
(38)
TANK
EXPANSION
251-1073
(37)
VALVE GP
BRAKER AND RELIEF
220-0812
(14)
VALVE GP
CONTROL
241-4822
(16)
VALVE
CHECK
119-0913
(9)
VALVE GP
CONTROL
241-4821
(10)
VALVE GP
RELIEF
142-4281
(11)
VALVE GP
RELIEF
9T-9197
(12)
VALVE GP
RELIEF
248-0020
(13)
VALVE
CHECK
6E-1291
(40)
SENSOR GP
PRESSURE
3E-6934
(50)
CONN AS
222-6869
(18)
CYLINDER GP
TILT RH
112-3171 (STD)
219-6273 (HIGH)
251-2005 (SUPER HIGH)
(17)
CYLINDER GP
LIFT
193-4076 (STD)
193-4075 (HIGH)
247-4565 (SUPER HIGH)
(19)
CYLINDER GP
TILT LH
112-3172 (STD)
219-6272 (HIGH)
247-4566 (SUPER HIGH)
(28)
VALVE GP
RELIEF
245-4891
(31)
VALVE GP
CHECK
264-6867
(5)
VALVE GP
RELIEF
143-8912
(5)
VALVE GP
RELIEF
143-8912
(5)
VALVE GP
RELIEF
143-8912
(8)
SWITCH AS
117-7773
(8)
SWITCH AS
117-7773
(36)
VALVE GP
BRAKER AND
RELIEF
133-1963
COMPONENT AND TAP LOCATIONS
AA
AA
BB
BB
CC
CC
DD
DD
EE
EE
FF
FF
GG
GG
HH
HH
JJ
JJ
KK
KK
LL
LL
57
57
56
56
55
55
54
54
53
53
52
52
51
51
50
50
49
49
48
48
47
47
46
46
45
45
44
44
43
43
43
43
43
43
42
42
41
41
41
41
40
40
39
39
38
38
37
37
36
36
35
35
35
34
34
33
33
32
32
31
31
30
30
29
29
28
28
27
27
26
26
25
25
24
24
23
23
22
22
21
21
20
20
19
17
17
16
16
15
15
14
14
13
13
11
11
10
10
9
9
8
8
7
7
6
6
6
6
5
5
4
4
3
3
2
2
1
1
VIEW ALL CALLOUTS
COMPONENT LOCATIONS
AA
AA
BB
BB
CC
CC
DD
DD
EE
EE
FF
FF
GG
GG
HH
HH
JJ
JJ
KK
KK
51
51
50
50
50
50
49
49
48
48
48
48
48
48
47
47
46
46
45
45
44
44
42
42
41
41
40
40
38
38
37
37
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BRAKE OIL COOLER SYSTEM
The hydraulic brake system control consists of the following components:
- Brake oil cooler tank (1)(A)
- Brake cooler pump (2)(B)
- Brake oil cooler (3)(C)
- Rear frame (4)(D)
Also shown is the transmission (5)(E).
E
B
A
C
D
BRAKE SCREENS
Right Rear Wheel Screen
Left Rear Wheel Screen
These views show the screen (B) for the
right and left rear wheel brake cooling circuit.
They are mounted to the axle housing
between the axle housing and the trunnion.
The rear brake cooling screens are also
equipped with check valves (not shown) to
prevent the oil from flowing in the wrong
direction.
The rear brake cooling screens are also
canister type screens with replaceable
elements.
B
B
The screens (A) for the front brakes cooling
circuit are mounted to the front axle
housing. Each screen has a check valve
(not shown) to prevent oil from flowing in
the reverse direction.
The brake cooling screens are canister type
screens with replaceable elements.
Front Wheel Screens
A
HIGH PRESSURE SCREEN
High pressure screen (B) is between the implement pump and the relief
valve group (C). Each individual implement pump is equipped with it
own high pressure screen and relief valve. The relief valve pressure is
adjusted by rotating the adjustment screw (A).
Also, the relief valve group (C) is equipped with a check valve (not
shown) with free flow out of the valve.
A
B
C
HYDRAULIC BRAKE SYSTEM CONTROL
The hydraulic brake system control consists of the following components:
- Steering and brake hydraulic tank (A)
- Service brake control valve (B)
- Parking brake control valve (C)
- Brake pump (D)
- Brake accumulators (E)
- Check Valves (F)
- Divider Block (G)
Also shown for relationship of the brake components on the machineare
the left side steering cylinder (H) and the rear frame (J).
J E H
D A
C B
E
F
G
HYDRAULIC BRAKE PUMP
This illustration shows the location of the brake pump (D) and the
checkvalve (9) on the rear pump drive (F).
Also shown is the steering and brake hydraulic tank (A) and brake
cooling tank (E). Installed on the steering and brake hydraulic tank are
the temperature sensor (C) and the liquid level switch (B) (the liquid
level switch is located on the opposite side of the tank). The
temperature sensor for the steering and brake hydraulic oil (C)
communicates with the VIMS module. The liquid level switch (B) for the
oil in the steering and brake hydraulic tank communicates with the
VIMS module.
Also shown are the steering and brake oil cooling pump (H) and the
hose (G) that is connected to the dividing block for the brake
accumulators (not shown).
A
B
C
E
G
J
F
H
IMPLEMENT CONTROL VALVES
This illustration shows the components in the right side
implement control valve. The controlvalve is accessed from
the articulation hitch. The following is a list of the components.
(A) - Inlet port for the right fixed displacement implement pump
(B) - Tilt rod end port
(C) - Tilt load check valve
(D) - Check valve
(E) - Tilt head end port
(F) - Check valve
(G) - Lift rod end port
(H) - Lift head end port
(J) - Check valve
(K) - Makeup and vent valve
(L) - Lift load check valve
(M) - Hydraulic tank port
This illustration shows the components in the left side
implement control valve. The controlvalve is accessed from
the articulation hitch. The following is a list of the components.
(A) - Inlet port for the left fixed displacement implement pump
(B) - Check valve
(C) - Lift head end drain port
(D) - Tilt load check valve
(E) - Relief and makeup valve
(F) - Tilt head end port
(G) - Tilt rod end port
(H) - Relief and makeup valve
(J) - Lift rod end port
(K) - Lift head end port
(L) - Makeup and vent valve
(M) - Relief and makeup valve
(N) - Lift load check valve
(O) - Hydraulic tank port
Right Side Implement Control Valve
Left Side Implement Control Valve
A
C
B
H
J
D
L
G
K
E
F
M
C
D
F
J
L
E
N
K
M
G
H
O
B
A
PRESSURE TAPS
ON THIS SCHEMATIC:
(KK) - Rear brake pressure
(JJ) - Front brake pressure
(HH) - Brake cooling pump pressure
(GG)- Front brake accumulator pressure
(FF) - Rear brake accumulator pressure
(CC) - Left steering pump pressure
(DD) - Right steering pump pressure
(EE) - Steering cooling pump pressure
(LL) - Transmission fluid sampling port (S•O•S)
ADDITIONAL:
(THESE TAPS ARE NOT REFERENCED ON THIS SCHEMATIC)
(1) - Implement pilot pressure
(2) - Implement cooling pump pressure
(3) - Speed clutch pressure
(4) - Directional clutch pressure
(5) - Torque converter inlet pressure
(6) - Torque converter outlet pressure
(7) - Lock-up clutch control pressure
(8) - Impeller clutch control pressure
(9) - Transmission lube pressure
The power train hydraulic system is equipped with remote pressure taps. The remote
pressure taps are located in the service bay, behind the cab. The remote pressure taps are:
2
1
3
9
4 5 6 7
8
LL
KK
JJ
GG
HH
FF
EE
DD
CC
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PRESSURE TAPS
BOTTOM ILLUSTRATION:
(EE) - Center Variable Displacement Pump
(CC) - Left fixed displacement pump
(FF) - Center fixed displacement pump
(DD) - Right fixed displacement pump
(JJ) - Lift head end pressure
(HH) - Tilt head end pressure
(KK) - Lift rod end pressure
(GG) - Tilt rod end pressure
TOP ILLUSTRATION:
(BB) - Implement Pilot Pump Pressure
(AA) - Implement Cooling Pump Pressure
AA
BB
CC
DD
EE
FF
GG
HH
JJ
KK
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VALVE GROUP IMPLEMENT SYSTEM
13
12
11
10
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