Sơ đồ thủy lực máy ủi caterpillar

KENR5152
20 Page, (Dimensions: 39 inches x 24 inches)
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
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
A B
P T
A B
P T
SHIFTED POSITION
INFINITE POSITION
CONTROL VALVES

ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOT
CONTROLLED
Hydraulic Symbols (Electrical)
Electrical Symbols Table
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
T
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
Electrical Symbols (Electrical)
©
2006 Caterpillar
All Rights Reserved

Printed in U.S.A.
KENR5152
December 2006
D6K Track-Type Tractor
Hydraulic and Power Train System
DHA1-UP
FBH1-UP
40
20
1
22
21
30
31
31A
REMOTE PRESSURE PORT
R1
R2
R3 R4 R5 R6
R13
R7 R8 R9 R10 R11
R12
24
CHARGE FILTERS
PUMP GROUP
Note: Taps P14 through P21 are located on the
underside of the of the Drive Pumps (20).
Taps P22 and P23 are located on the underside
of the Winch Pump (the winch pump is not shown).
4

40
3
4 Bank
3 Bank
IMPLEMENT VALVE
WINCH
RIPPER
3
8
Ripper
Angle
Tilt
Lift
Angle
Tilt
Lift
10
10
9
22
23 25 26
41
Left Rear Access Panel
Right Rear Access Panel
FAN MOTOR and
FAN MANIFOLD
Machine
Control
NO. PART NO. DESCRIPTION
IMPL

1 246-9876 PUMP GP (IMPLEMENT)
2 249-8600 PUMP GP (WINCH)
3
244-7115 VALVE GP (LIFT /TILT /ANGLE) (3 BANK)
246-8498 VALVE GP (LIFT /TILT/ ANGLE /RIPPER - OPTION) (4 BANK)
4 226-0420 ACCUMULATOR
5 269-2730 CYLINDER GP-LIFT
6 269-2729 CYLINDER GP-TILT
7 269-2728 CYLINDER GP-ANGLE
8 227-0842 CYLINDER GP-RIPPER
9 292-8012 VALVE GP (BACK PRESSURE)
10 297-1422 MOTOR GP-WINCH (WINCH MOTOR & VALVE AS.)
HYSTAT
20 243-6637 PUMP GP
21 243-6639 MOTOR GP - LH
22 243-6640 MOTOR GP - RH
23 253-1803 VALVE GP (RETURN MANIFOLD)
24 264-2995 CHARGE FILTER
25 185-4026 VALVE GP (CHECK VALVE)
26 240-8543 CORE ASSEMBLY (OIL COOLER)
FAN
30 256-2287 MOTOR GP
31 252-7008 MANIFOLD GP (FAN MANIFOLD)
31A 285-7460 MANIFOLD GP (REV MANIFOLD - OPTION)
MISC
40 246-7379 TANK GP
41 202-6625 SUCTION SCREEN
42 183-3873 BREATHER
COMPONENT LIST
PRESSURE TAPS

REMOTE PRESS PORTS
RI WINCH PUMP 'Mb' PORT
R2 WINCH PUMP 'G' PORT
R3 IMPL PUMP SIGNAL PRESS 'LS' PORT
R4 REAR PUMP 'G' PORT
R5 FRONT PUMP CASE PRESS PORT
R6 FRONT PUMP 'Mb' PORT
R7 WINCH PUMP 'Ma' PORT
R8 PARK BRAKE PRESS PORT
R9 FRONT PUMP 'G' PORT
R10 FAN PUMP OUTLET PRESS
R11 IMPL PUMP OUTLET PRESS
R12 REAR PUMP 'Mb' PORT
R13 IMPL PUMP FILLING PORT
LOCAL PRESS PORTS
P14 FRONT PUMP 'MA' PORT
P15 FRONT PUMP 'X1' PORT
P16 FRONT PUMP 'X2' PORT
P18 REAR PUMP 'MA' PORT
P19 REAR PUMP 'X1' PORT
P20 REAR PUMP 'X2' PORT
P21 REAR PUMP 'Y' PORT
P22 WINCH PUMP X1
P23 WINCH PUMP X2
TAP
NUMBER
DESCRIPTION
SENR8390-01
8Page
May 2005

D6M Track-Type Tractor
Hydraulic System
9ZM1-UP
2RN1-UP
3WN1-UP
4JN1-UP
5NR1-UP
5WR1-UP
6LR1-UP
2YS1-UP
4GS1-UP
4HS1-UP
©
2005 Caterpillar
All Rights Reserved
Printed in U.S.A.
SENR8390-01
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
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
MANUAL SHUTOFF
SHUTTLE PILOT
CONTROLLED
Hydraulic Symbols (Electrical)
Electrical Symbols Table
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
T
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
Electrical Symbols (Electrical)
SENR8390-01
8 Page, B&W
1
2
3
4
5
6
7
8
9
1
0
1
1
1
2

1
3
1
4
1
5
1
6
1
7
1
8
9
1
0
d74513
7
8
6
5
AA BB
V
12
D
19 20
19 20
E
4
8
3

2
K
N
M
E
14
13
1
9
F
11
10
D
A
B
C
D
CC
E
15
16
V
R
Y
Z
Q
W
S
T
U

T
V
17
17
X
U
18
P
N
M
L
EE
CC
K
J
G
H
S
D74312
I t em Description
A
Cylinder Bypass
B
Rod End
C
Head End
D
Suction
E
Pump Case Drain

F
Implement Return
G
Float Detent
H
Pump Signal
I
Ports Blocked when Using "SU" Blade
J
Line AA-BB Blocked for Power Beyond End
Cover
Line AA-BB Open for Standard End Cover
K
For Power Beyond Use 4T-7862 End Cover
L
System Pressure
M
Signal Pressure
N
Baffle
D6M Schematic
Item Description Quantity
1
4 Bank Valve Group (All Dozers with Ripper) 1
3 Bank Valve Group (Standard "P" Dozer) 1
2 Bank Valve Group ("SU" Blade) 1
2
Inlet Manifold Cover Assembly 1
3
Dozer Lift Valve Group (STD "P" Lift) 1

DozerLiftValve(Dozerswith"SU"Bladeor
Ripper)
1
4
Dozer Tilt Valve Group (STD) 1
5
Dozer Angle Valve Group (STD) 1
6
Ripper Lift Valve Group 1
7
End Cover 1
8
Check Valve Group 2
9
Cylinder Group (STD "P" Lift) 2
Cylinder Group ("SU" Lift) 2
10
Cylinder Group (STD "P" Tilt) 1
Cylinder Group ("SU" Tilt) 1
11
Cylinder Group (STD "P" Angle) 2
12
Cylindeer Group (Ripper Lift) 2
13
Tank Group 1
14
Filter Element 1
15
Pump Group 1
16

Make Up Valve Group (With Line Relief) 2
17
Make Up Valve Group With Line Relief
(Dozers With "SU" Blade or Ripper)
1
18
Plug 2
19
Seal 2
Hydraulic System Components
KENR5140-01
24 Page, (Dimensions: 34 inches x 28 inches)
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
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
A B
P T
A B
P T
SHIFTED POSITION
INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOT
CONTROLLED
Hydraulic Symbols (Electrical)
Electrical Symbols Table
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
T
Pressure

Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
Electrical Symbols (Electrical)
©
2007 Caterpillar
All Rights Reserved
Printed in U.S.A.
KENR5140-01
February 2007
D6N Track-Type Tractor
Hydraulic System
DJA1-UP
JAH1-UP
ERL1-UP
JAL1-UP
DJY1-UP
Tap
Number
Description
Schematic
Location
A Implement Pump Discharge B-2
B Implement Pump Signal C-2
C Case - Implement Pump C-4
D Pilot Supply B-2

E Charge Pump Relief B-2, E-3
F Charge Pump Discharge B-2, F-3
G Case - Steering Pump B-2, D-3
K Upstream Filter D-2
MA Right Steer Loop C-2, F-2
MB Left Steer Loop C-2, F-3
SOS Oil Sampling F-6
X1 Right Steer Actuator
X2 Left Steer Actuator
Y1 Right Steer Pilot
Y2 Left Steer Pilot
Tap Locations
E-2
C-2, D-3
Machine
Location
Description
Part
Number
Schematic
Location
3 Valve Bank (STD) 246-4208
4 Valve Bank (with Ripper) 246-4206
2 Manifold Cover AS 9T-6695 B-7
Lift Valve (No Ripper) 246-4211
Lift Valve (With Ripper) 246-4212
4 Tilt Valve 246-4214 D-7
5
Angle Valve 238-4825 E-6
6 Ripper Valve 247-1745 F-6

7
End Cover 240-9086 F-7
Lift Check Valve 1U-2744 C-6
Ripper Check Valve 1U-2744 F-6
Lift Cylinder (P Blade) 110-3269
Lift Cylinder (SU Blade) 115-3524
Tilt Cylinder (P Blade) 160-0054
Tilt Cylinder (SU Blade) 115-3523
11 Angle Cylinder 152-6485 C-5, E-5
12
Ripper Lift Cylinder 9T-2716 E-8
13 Hydraulic Oil Tank 230-9131 A-3
14
Implement Return Filter 1R-0777 A-3
15
Case Drain Filter 169-4019 B-3
16
Implement Pump 195-9097 C-3
Angle Relief Valve A 6E-0772
Angle Relief Valve B 6E-0772
18 Make Up Valve 132-5303 C-6
19
Angle Valve Plug 148-8409 D-6
20 Resolver Valve 248-6162 B-4
21
Steering Pump 257-8470 D-2
22
Steering Motor 191-9536 F-2
23
Cooler 274-5095 E-4

24
Cooler Bypass Valve 126-0747 E-4
25
Charge Circuit Filter 110-4664 D-2
26
Steering Pilot Valve 9T-8693 D-3
27
Cold Start Valve 198-9219 F-3
28 Dozer Pilot Valve 235-0889 A-6
29 Ripper Pilot Valve 230-9136 A-8
30
Pressure Reducing Valve 162-0162 C-8
31
Screen 6E-5066 B-8
32
Accumulator 200-0750 C-8
33
Pilot Control Manifold 250-5788 A-4
34
Shuttle Valve 231-5213 B-5
Component Locations
1
10
9
8
17
B-6
3
B-7
C-5, E-5

D-5
E-6
4 VALVE BANK Remote Test Port Panel Charge Circuit Filter
Implement Pump
Pilot Control Manifold
Machine Component Location
SOS
MA MBY1
B
E
A
D
Y2
K
C
25
22
32 11
9
12
30 31
27
16
25 23
10
14
151
13
24
11

29
21 25
28
23
1
10
11
9
12
13
22
16
14
24
32
7
6
5
2
8
17
18
4
17
19
3
8
1530
20
2931

22
1
25
23
16
33
28
26
26
34
33
34
33
Steering charge circuit oil enter the charge filter (25) through the right hand fitting.
Clean filtered charge circuit oil exits the filter at the left hand fitting and flows to the
pilot steering control and the steering pump.
A combination S•O•S and fluid sampling port (K) is installed on the inlet side of the
charge circuit filter base.
The implement pump (16) is mounted
to the lower left rear face of the torque
converter housing.
The Pilot Control Manifold (33) for the AccuGrade™ system is located below the
bank 4 valve stack behind the right hand lower interior trim panel.
Located inside the machine right fender outside compartment is the Hydraulic Pressure
Remote Test Port panel. Machine system pressures can be checked and monitored
here. The arrangement of the pressure ports on this panel are:
- D Pilot Supply.
- E Charge pump relief.
- A Implement pump discharge.
- SOS Oil Sampling.

- Y2 Left steer pilot.
- Y1 Right steer pilot.
- MA Right steer loop.
- MB Left steer loop.
- B Implement pump signal.
KENR5140-01
24 Page, Color, (Dimensions: 34 inches x 28 inches)
THIS SCHEMATIC IS FOR THE D6N TRACK-TYPE TRACTOR
PART #: 246-5101 CHG 05
Components are shown installed on a fully operable machine with the engine off.
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
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations
DRAIN / RETURN LINE
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
IMPLEMENT PUMP CIRCUIT
STEERING PUMP CIRCUIT
STEERING CIRCUIT
PILOT OIL CIRCUIT
ANGLE CYLINDER CIRCUIT

RIPPER CYLINDER CIRCUIT
RESOLVER CIRCUIT
SUPPLY LINE
RIPPER CONTROL CIRCUIT
TILT CYLINDER CONTROL CIRCUIT
LIFT CYLINDER CIRCUIT
LIFT CYLINDER CONTROL CIRCUIT
STEERING ACTUATOR CIRCUIT
88
8
A
B
C
D
E
F
8
A
B
C
D
E
F
1
23
4
56
7
1
23

4
56
7
2
3
4
5
A
C
D
F
B
2
3
4
5
A
C
D
F
B
6
7
6
7
EE
Tap
Number
Description
Schematic

Location
A Implement Pump Discharge B-2
B Implement Pump Signal C-2
C Case - Implement Pump C-4
D Pilot Supply B-2
E Charge Pump Relief B-2, E-3
F Charge Pump Discharge B-2, F-3
G Case - Steering Pump B-2, D-3
K Upstream Filter D-2
MA Right Steer Loop C-2, F-2
MB Left Steer Loop C-2, F-3
SOS Oil Sampling F-6
X1 Right Steer Actuator
X2 Left Steer Actuator
Y1 Right Steer Pilot
Y2 Left Steer Pilot
Tap Locations
E-2
C-2, D-3
JOYSTICK
THUMB
SWITCH
ECM
TO ANGLE VALVE
E/H SOLENOID VALVES
Machine
Location
Description
Part
Number

Schematic
Location
3 Valve Bank (STD) 246-4208
4 Valve Bank (with Ripper) 246-4206
2 Manifold Cover AS 9T-6695 B-7
Lift Valve (No Ripper) 246-4211
Lift Valve (With Ripper) 246-4212
4 Tilt Valve 246-4214 D-7
5
Angle Valve 238-4825 E-6
6 Ripper Valve 247-1745 F-6
7
End Cover 240-9086 F-7
Lift Check Valve 1U-2744 C-6
Ripper Check Valve 1U-2744 F-6
Lift Cylinder (P Blade) 110-3269
Lift Cylinder (SU Blade) 115-3524
Tilt Cylinder (P Blade) 160-0054
Tilt Cylinder (SU Blade) 115-3523
11 Angle Cylinder 152-6485 C-5, E-5
12
Ripper Lift Cylinder 9T-2716 E-8
13 Hydraulic Oil Tank 230-9131 A-3
14
Implement Return Filter 1R-0777 A-3
15
Case Drain Filter 169-4019 B-3
16
Implement Pump 195-9097 C-3
Angle Relief Valve A 6E-0772

Angle Relief Valve B 6E-0772
18 Make Up Valve 132-5303 C-6
19
Angle Valve Plug 148-8409 D-6
20 Resolver Valve 248-6162 B-4
21
Steering Pump 257-8470 D-2
22
Steering Motor 191-9536 F-2
23
Cooler 274-5095 E-4
24
Cooler Bypass Valve 126-0747 E-4
25
Charge Circuit Filter 110-4664 D-2
26
Steering Pilot Valve 9T-8693 D-3
27
Cold Start Valve 198-9219 F-3
28 Dozer Pilot Valve 235-0889 A-6
29 Ripper Pilot Valve 230-9136 A-8
30
Pressure Reducing Valve 162-0162 C-8
31
Screen 6E-5066 B-8
32
Accumulator 200-0750 C-8
33
Pilot Control Manifold 250-5788 A-4
34

Shuttle Valve 231-5213 B-5
Component Locations
1
10
9
8
17
B-6
3
B-7
C-5, E-5
D-5
E-6
RIPPER
LIFT
ANGLE
TILT
LIFT
ANGLE
DOZER LIFT
RIPPER
RAISE B
LOWER A
RIGHT B
LEFT A
DOZER TILT
RAISE B
LOWER A
INLET
END COVER

RIGHT B
LEFT A
LOWER BOOST SIGNAL
BAFFLE
1
2
T
S1 2
RIPPER
1
2
3
4
T
S
1
2
3
4
T
S
ELEC. DET.
LIFT TILT
33
18
12
32
30
31
29

1
2
3
4
6
17
5
19
8
20
9
11
10
11
9
17
8
7
28
13
14
15
16
26
25
21
23
24
27
22

C4C3C2C1
C2
C1
C4
C3
A
D
E
F
G
B
Y2
Y1
MB
MA
X2
X1
MA
MB
E
F
G
K
Y1
Y2
C
SOS
ANGLE
REMOTE TAP PANEL
POWER TRAIN ECM

VPAT BLADE ATTACHMENT
34
SENR9499-01
February 2001
D6R Track-Type Tractor
4FM1-Up (Machine)
8TM1-Up (Machine)
9BM1-Up (Machine)
3ZN1-Up (Machine)
5LN1-Up (Machine)
7KN1-Up (Machine)
9MN1-Up (Machine)
9PN1-Up (Machine)
DMP1-Up (Machine)
4TR1-Up (Machine)
5PR1-Up (Machine)
5RR1-Up (Machine)
7DR1-Up (Machine)
7GR1-Up (Machine)
1RW1-Up (Machine)
©
2001Caterpillar
All Rights Reserved
Printed in U.S.A.
Hydraulics
Differential Steering
D81514
1
19
20

21
22
23
24
2
3 4
5
6
8
7
9
10
11
13
12
15 14
16
17
18
A
B
C
No Description
1 Main Relief Valve Group
2 Charging Valve Group
3 Quick-Drop Valve Group
4 Bulldozer Lift Cylinder Group
5 Rod End of Cylinder
6 Head End of Cylinder
7 Counterbalance Valve Group

8 Steering Motor Group
9 Cooler Bypass Valve Group
10 Pump Group Cooling Circuit
11 Implement and Steering Pump Group
12 Case Drain Filter Group
13 Baffle
14 Return Filter
15 Hydraulic Tank and Filter Group
16 Breather Valve Group
17 Bulldozer Dual Tilt Cylinder Group (optional)
18 Bulldozer Tilt CylinderGroup (optional)
19 Ripper Lift Cylinder Group
20 End Cover
21 Ripper Lift Control Valve
22 Bulldozer Tilt Valve Group
23 Bulldozer Lift Valve Group
24 Steering Valve Group
A Signal Pressure
B Margin Pressure
C System Pressure
HYDRAULIC SYSTEM COMPONENTS
RENR4275-03
30 Page, BJS
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
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
MANUAL SHUTOFF
SHUTTLE PILOT
CONTROLLED
Hydraulic Symbols (Electrical)
Electrical Symbols Table
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
T
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
Electrical Symbols (Electrical)
Differential Steering - Standard, Power Angle Tilt, and Accugrade Options
RENR4275-03
November 2004
D6R Series II Track-Type Tractor
Hydraulic System
AAX1-UP
BMY1-UP
BPZ1-UP
BRZ1-UP
BNC1-UP
ADE1-UP

BRE1-UP
DAE1-UP
BNL1-UP
AFM1-UP
BPM1-UP
AEP1-UP
BLT1-UP
FDT1-UP
©
2004 Caterpillar
All Rights Reserved
Printed in U.S.A.
TOPLEFTSIDEVIEW
TOP VIEW
FRONT VIEW
LEFT SIDE VIEW
DOZER ANGLE
RIPPER LIFT
DOZER TILT
DOZER LIFT
STEERING
RIPPER / WINCH
DOZER TILT
DOZER LIFT
STEERING
DOZER TILT
DOZER LIFT
STEERING
FW
D

FWD
FWD
Machine Component Locations
Description
Part
Number
Machine
Location
Schematic
Location
Accumulator Gp - Pilot Circuit 200-0750 1 D-12
Cooler Gp - Hydraulic Oil 169-3806 2 G-5
Cover - Valve Stack 169-9119 3 C-9
Cylinder Gp - Angle 203-0820 4 E-1
Cylinder Gp - Dual Tilt Note A 9T-6095 5 G-1
Cylinder Gp - Ripper Lift 9T-2716 7 I-12
Cylinder Gp - Single Tilt 166-2582 8 F-1
Element - Imp Return 4T-0552 9 E-5
Filter - Case Return 9T-8999 10 F-5
Pump Gp - Piston 162-0324 11 G-4
Manifold Gp - Inlet 164-8913 14 H-9
Manifold Gp - Block 222-0417 13 D-7
Manifold Gp - Blade Tilt & Angle Cy Rel 212-3726 12 F-2
Sensor Gp - Pressure 224-4535 18 B-5
Tank Gp - Filter
Note B
Note D
197-0959 19 E-5
Valve Gp - Mounting & 234-5126
20

A-5
Valve Gp - Breather 3G-4783
22
F-5
Valve Gp - CBAL (Lift Circuit) 239-0681
23
G-3
21
Valve Gp - Control (Angle) 208-1492 D-9
Valve Gp - Control (Dozer Lift) 162-8040 F-9
Valve Gp - Control (Dozer Tilt)
25
Note D 216-8609
E-924
Note A
162-8041
Valve Gp - Control (Ripper) 162-8042
26
E-9
Valve Gp - Control (Steering) 107-1191
27
G-9
Valve Gp - Control (Winch) 232-4854
28
E-7
30
Valve Gp - Pressure Reducing & Check 162-0162 31 E-11
Valve Gp - Quick Drop 113-5429 32 H-2
Valve Gp - Shut-Off 130-4531 34 D-11
Valve Gp - Solenoid 206-4795 35 D-7

Valve Gp - Steering Counter-Balance 9T-4789 36 H-5
Motor Gp - Steering Motor 159-7156 15 G-5
Valve Gp - Winch Pilot 160-0766 38
39
A-12
Winch Arr - Paccar Winch Unit 232-6203 G-12
Component Locations
Valve Gp
- Unit Test 5 (Note D, H)
- Unit Test 4 (Note A, E)
- Unit Test 4 (Note A, G)
- Unit Test 3 (Note A, F)
206-7334
162-8036
232-5921
162-8034
37 H-9
Valve Gp - Ripper Pilot (Single Axis)
Note C
Valve Gp - Cooler Bypass
(Pressure Based)
119-9620
29
G-6
167-1177 33 C-12
Cylinder Gp - Lift
(Std)
(LGP)
127-8931
129-4258

6 H-2
Valve Gp - Dozer Pilot Valve
DS
DS (CTCT)
PAT
PAT(CTCT)
200-0189
240-9654
206-7333
240-9655
C-4
Resolver Valve
233-6942
238-4986
16
17
A-5
F-7, F-10
Note A: Only on DS and DS (CTCT)
Note B: Only on AccuGrade Option
Note C: For Angle Pilot Control Press
Note D: Only on PAT and PAT (CTCT)
Note E: Steer, Dozer Lift/Tilt, Ripper
Note F: Steer, Dozer Lift/Tilt
Note G: Steer, Dozer Lift/Tilt, Winch
Note H: Steer, Dozer Lift/Tilt/Angle, Ripper Lift
Note I: Only on DS
Note J: Only on DS (CTCT)
Note K: Only on PAT
Note L: Only on PAT (CTCT)

Power Angle Tilt - Option
Standard Dozer Blade
Lines Group - Pump
Pump Gp - Pressure Taps
Lines Group - Implement & Steering Pump
9
2
32
4
8
10
12
3
15
29
36
11
1
16
14
21
17
23
25
24
37
26
2215
22
11

1
31
20
19
34
2713
33 35
38
9
12
3 1014161719
21 23 24 25 37
1
18
31
34
13 20 27
33 35 38
38
28
28 29
4
5
5
4
4
8
15
36
2

32
HB
HA
HB
HA
HA
HB
HB
HA
CP
CP
K
K
K
BB
Unit Test 3 - 162-8034
Unit Test 4 - 162-8036 (Ripper)
- 232-5291 (Winch) Unit Test 5 - 206-7334
Accumlator
Optional - Ripper & Winch
37
7
Ripper
Winch
Tap
Number
Description
Schematic
Location
CP D-11

F-5
H-4
E-11
F-5
H-5
G-5
D-11
(Pressure Tap after Pressure Reducing Valve
and after Discharge Valve.)
Pilot Supply
K Upstream Filter
SOS Oil Sampling Port
Tap Locations
Pressure, Sampling, and Sensor
HA Implement Pump Discharge - at Valve
BB Oil Cooler (Outlet) and Steering Motor (Supply) Port
MB Steering Port B
MA Steering Port A
HB Implement Pump Signal - at Valve
Compensator Valve
Piston-type Pump
RENR4275-03
30 Page, Color 4, BJS
S
T
A
N
D
A
R

D
A
C
C
U
G
R
A
D
E
A
C
C
U
G
R
A
D
E
A
C
C
U
G
R
A
D
E
A
C

C
U
G
R
A
D
E
A
C
C
U
G
R
A
D
E
S
T
A
N
D
A
R
D
S
T
A
N
D
A

R
D
S
T
A
N
D
A
R
D
S
T
A
N
D
A
R
D
S
T
A
N
D
A
R
D
A
C
C
U

G
R
A
D
E
S
T
A
N
D
A
R
D
A
C
C
U
G
R
A
D
E
A
B
C
D
E
F
G
H

I
A
B
C
D
E
F
G
H
I
12 11 10 9 8 7 6 5 4 3 2 1
12 11 10 9 8 7 6 5 4 3 2 1
Components are shown installed on a fully operable machine with the key and engine
off and transmission shifter in neutral.
Note A: Only on DS and DS (CTCT)
Note B: Only on AccuGrade Option
Note C: For Angle Pilot Control Press
Note D: Only on PAT and PAT (CTCT)
Note E: Steer, Dozer Lift/Tilt, Ripper
Note F: Steer, Dozer Lift/Tilt
Note G: Steer, Dozer Lift/Tilt, Winch
Note H: Steer, Dozer Lift/Tilt/Angle, Ripper Lift
Note I: Only on DS
Note J: Only on DS (CTCT)
Note K: Only on PAT
Note L: Only on PAT (CTCT)
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
Implement Pump Output.
Tilt Cylinder Control Circuit.
Supply Line.

Drain / Return Line.
Angle Cylinder Control Circuit.
Dozer Lift Cylinder Control
Circuit.
Steering Control Circuit.
Ripper / Winch Cylinder
Control Circuit.
MACHINE ARRANGEMENTS
Power Angle Tilt (PAT) Option
AccuGrade Option
Ripper / Winch Option
HYDRAULIC
COLOR
LEGEND
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Attachment
Air Line
CALLOUTS
ARROW PATTERNS
Taps (Pressure, Sampling, Sensor) by letter
Components by number
Connections by letter
AccuGrade Options
Ripper / Winch Options
Tilt Options
1

AA
YY
THIS SCHEMATIC IS FOR THE D6R SERIES II - DS, DS (CTCT), PAT, PAT (CTCT)
Part #: 172-0096 CHG03 D6R SERIES II - DIFF STR
Part #: 238-1904 CHG03 D6R SERIES II - DS (CTCT)
Part #: 211-3269 CHG04 D6R SERIES II - PAT
Part #: 238-1903 CHG02 D6R SERIES II - PAT (CTCT)
)(
BB
HB
K
MB
MA
SOS
DD
DD
CC
EE
C1
C2
C4
C4C3C2C1
C3
CC
EE
ZZ
ZZ
XX
WW
YY

YY
XX
WW
HA
CP
SEE LOC
G-11
SEE LOC
G-11
SEE LOC
H-11
SEE LOC
I-6
SEE LOC
A-11
SEE
LOC
B-11
SEE LOC
D-7
SEE LOC
D-9
SEE LOC
D-8
SEE LOC
D-7
SEE
LOC
E-2
SEE LOC

D-8
1
2
3
4
ABCD
CYLINDER GP
LIFT
STD
127-8931
LPG
129-4258
PUMP GP
IMPLEMENT &
STEERING PUMP
162-0324
COOLER GP
HYDRAULIC OIL
169-3806
MANIFOLD
BLADE TILT AND
ANGLE CYL RELILEFS
212-3726
FILTER GP
CASE DRAIN RETURN:
(ELEMENT 4T-6788)
9T-8999
RESOLVER VALVE
238-4986
RESOLVER VALVE

238-4986
VALVE GP
SOLENOID
NOTE C
206-4795
MANIFOLD
222-0417
COVER
VALVE STACK
169-9119
VAVLE GP
CONTROL ANGLE
208-1492
VALVE GP
CONTROL RIPPER
162-8042
VALVE GP
CONTROL TILT
NOTE A
162-8041
NOTE D
216-8609
VALVE GP
CONTROL LIFT
162-8040
VALVE GP
CONTROL STEERING
107-1191
MANIFOLD GP
INLET MANIFOLD

WITH RELIEF
164-8913
CYLINDER GP
RIPPER LIFT
9T-2716
WINCH AR
232-6203
VALVE GP
MANIFOLD
PRESSURE REDUCING
AND CHECK VALVES
162-0162
ACCUMULATOR
PILOT CIRCUIT
200-0750
VALVE GP
SHUT-OFF
130-4531
VALVE GP
RIPPER PILOT
167-1177
VALVE GP
WINCH PILOT
CONTROL
160-0766
WINCH CONTROL
WINCH CONTROL
RIPPER CONTROL
RIPPER CONTROL
WINCH ARRANGEMENT

WINCH ARRANGEMENT
RIPPER ARRANGEMENT
RIPPER ARRANGEMENT
RESOLVER VALVE
233-6942
SENSOR GP
PRESSURE
224-4535
VALVE GP
DOZER PILOT
NOTE I
200-0189
NOTE J
240-9654
NOTE K
206-7333
NOTE L
240-9655
CYLINDER GP
ANGLE
203-0820
VALVE GP
NOTE A, E
UNIT TEST 4
162-8036
NOTE A, F
UNIT TEST 3
162-8034
NOTE A, G
UNIT TEST 4

232-5921
NOTE D, H
UNIT TEST 5
206-7334
VALVE GP
CONTROL WINCH
232-4854
TANK GP
FILTER
197-0959
VALVE GP
BREATHER
3G-4783
VALVE GP
COOLER BYPASS
119-9620
MOTOR GP
STEERING MOTOR
159-7156
VALVE GP
COUNTER BALANCE
VALVE - STEERING
9T-4789
ELEMENT
IMP RETURN
4T-0522
CYLINDER GP
DUAL TILT
NOTE A
9T-6095

VALVE GP
COUNTERBALANCE
LIFT CIRCUIT
NOTE B
239-0681
VALVE GP
TILT
166-2582
VALVE GP
QUICK DROP
113-5429
WINCH CONTROL
WINCH CONTROL
P
A
T
PAT
P
A
T
P
A
T
PAT
P
AT
POWER ANGLE TILT (PAT)
POWER ANGLE TILT
P
A

T
P
A
T
P
AT
P
AT
POWER ANGLE TILT (PAT)
WINCH ARRANGEMENT
RIPPER ARRANGEMENT
DUAL TILT OPTION
SINGLE TILT OPTION
SINGLE TILT OPTION
DUAL TILT OPTION
RIPPER COMPONENT
RIPPER COMPONENT
WINCH COMPONENT
WINCH COMPONENT
RAISE
LOWER
PAY OUT
HAUL IN
PS
T
CP
ACC
3
4
3

4
T
S
FREE SPOOL
1
23 4
T
S
1
2
3
4
T
S
ELEC. DET.
HAUL IN
PAY OUT
PILOT SUPPLY
PILOT DRAIN
RAISE
LOWER
TILT RIGHT
TILT LEFT
RAISE TILT
RETURN
RAISE
LOWER
TILT LEFT
TILT RIGHT
TILT LEFT

TILT RIGHT
HOUSING DRAIN
HOUSING DRAIN
BYPASS
AIR RELIEF
PUMP FLUSHING CIRCUIT
MOTOR FLUSHING CIRCUIT
AIR VENT
SIGNAL TO PUMP
STEERING
INLET MANIFOLD
DOZER LIFT
DOZER TILT
PUMP DISCHARGE
FLOAT PILOT BOOST
PRESSURE LIMITER
SUCTION
STEER RIGHT
STEER LEFT
PRESSURE LIMITER
BLADE
LIFT
B
A
1
2
3
4
T
S

1
2
3
4
T
S
ELEC. DET.
RIPPER CONTROL
PAY OUT
HAUL IN
DOZER ANGLE
END COVER
ANGLE LEFT
ANGLE RIGHT
BLADE ANGLE
TOP
JUNCTION PLATE
LEFT
RIGHT
LEFT SIDE
OF TRACTOR
ECM
JOYSTICK
THUMB
SWITCH
ANGLE LEFT
ANGLE RIGHT
RAISE
LOWER
FLOAT PILOT BOOST

RAISE
LOWER
FLOAT PILOT BOOST
TILT LEFT
TILT RIGHT
RAISE
LOWER
PUMP DISCHARGE
G
X
SEE LOC
B-5
SEE LOC
B-5
SEE LOC
B-5
SEE LOC
B-5
SEE
LOC
F-10
SEE
LOC
F-7
SEE
LOC
F-10
SEE
LOC
F-7

TILT RIGHT
TILT LEFT
RAISE
LOWER
TILT RIGHT
TILT LEFT
TILT RIGHT
TILT LEFT
RAISE
LOWER
TILT RIGHT
TILT LEFT
STEER RIGHT
STEER LEFT
T
T
B
P
LU
P
IMP
CYL
LS
X
LS
Locations: C-12, E-9, H-6, I-12
Locations: D-7, D-9, D-11, E-2
Locations: C-5, E-8, E-10, F-8, F-10, I-3
PILOT SUPPLY
PILOT DRAIN

PILOT SUPPLY
PILOT DRAIN
VALVE GP
234-5126
Single / Dual Tilt Option
Location: F-1
Single Tilt
Dual Tilt
Single Tilt
Dual Tilt
RENR7956-01
24 Page
Pilot Control and Accugrade Ready (HE)
RENR7956-01
June 2006
D6R Series III Track-Type Tractor
Hydraulic System
GJB1-UP
WCB1-UP
HDC1-UP
RFC1-UP
TBC1-UP
JEK1-UP
HCD1-UP
HKE1-UP
WRG1-UP
MTJ1-UP
©
2006 Caterpillar
All Rights Reserved

Printed in U.S.A.
DMK1-UP
LGP1-UP
JDL1-UP
DLM1-UP
LFM1-UP
EXL1-UP
DPS1-UP
EXW1-UP
GMT1-UP
MRT1-UP
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
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
MANUAL SHUTOFF
SHUTTLE PILOT
CONTROLLED
Hydraulic Symbols (Electrical)
Electrical Symbols Table
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
T
Pressure
Symbol
Temperature

Symbol
Level
Symbol
Flow
Symbol
Electrical Symbols (Electrical)
Item
Number
Description
Part
Number
Schematic
Location
1 Pump - Implement and Steering 227-0830 F-2
2 Steering Motor 159-7156 E-4
3 Valve Gp. - Counter Balance 227-0832 E-3
Valve Gp. - Steering, Dozer Lift/Tilte 224-4936 E-5
Valve Gp. - Steering, Dozer Lift/Tilte (Ripper) 224-2937 E-5
Valve Gp. - Steering, Dozer Lift/Tilte (Winch) 239-6076 E-5
5 Manifold Gp. - Inlet Manifold with Relief 235-0401 E-5
6 Valve Gp. - Steering Control 235-0402 E-5
7 Valve Gp. - Dozer Lift 235-0403 D-5
8 Valve Gp. - Dozer Tilt 235-0404 C-5
Valve Gp. - Ripper 235-0405 C-8
Valve Gp. - Winch 239-6074 C-5
10 Cover 235-0399 B-5, B-8
11 Valve Gp. - Ripper Pilot Valve 167-1177 B-8
12 Valve Gp. - Dozer Pilot Valve 200-0189 D-1
13 Valve Gp. - Shut Off 201-0950 D-8
14 Accumulator 200-0750 D-8

15
Valve Gp. - Pressure Reducing Manifold and
Check Valves
226-4751 D-8
16 Valve Gp. - Cooler Bypass 9T-3004 A-3
17 Cooler 169-3806 E-2
18 Valve Gp. - Breather 3G-4783 A-3
19 Element - Implement and Case Drain Return 1R-0777 A-3
20 Valve Gp. - Quick Drop 227-0831 F-1
Cylinder Gp. - Lift (STD) 227-0844 F-1
Cylinder Gp. - Lift (LGP) 227-0843 F-1
22 Cylinder Gp. - Dual Tilt (Option) 227-0841 E-1
23 Cylinder Gp. - Tilt 233-9134 E-1
24 Cylinder Gp. - Ripper Lift 227-0842 E-8
25 Tank Gp. 224-4946 A-3
26 Valve Gp. - Winch Pilot Control 160-0766 A-8
27 Winch Arrangement 237-5912 F-8
28 Valve Gp. - Counter Balance-Lift Circuit 239-0681 F-2
29 Valve Gp. - EH Solenoid Valves 239-5317 C-1
30 Shuttle Valve 233-6942 C-1
4
9
21
Component Locations
Tap Locations
Pressure, Sampling, and Sensor
Tap
Number
Description
Schematic

Location
HB IMPLEMENT PUMP SIGNAL PRESSURE F-3
HA IMPLEMENT PUMP DISCHARGE PRESSURE E-8
K UPSTREAM FILTER PRESSURE D-3
CP PILOT SUPPLY PRESSURE D-8
CPG ACCUMULATOR D-8
MA STEERING PORT PRESSURE (A) F-4
MB STEERING PORT PRESSURE (B) E-4
C COOLER BYPASS PRESSURE D-2
1
B
C
D
E
F
G
The pressure reducing manifold (15) is located inside the forward compartment on the
right fender and is situated outboard from the power train oil filter. Service points identi-
fied above are:
(HA) Implement pump discharge pressure test port.
(14) Accumulator.
(CP) Pilot supply pressure test port.
(S•O•S) Hydraulic oil sampling port.
(CPG) Accumulator pressure test port.
The implement hydraulic pump (1) is mounted to the rear of the flywheel housing, at the upper
left corner. High pressure supply oil to the implement valve stack is directed through a hose
that connects to the pump discharge port (B). High pressure supply oil to the pressure reduc-
ing manifold is directed through a hose that connects to the lower fitting (C) from the pump
discharge port.
A pump discharge pressure sensor (D) is installed on the opposite side of the "tee" fitting from

the pressure reducing manifold supply line. This pressure sensor is only present on machines
that are equipped with AccuGrade. It is a necessary component for the calibration of the four
proportional solenoids on the EH pilot manifold that are used for blade control. Machines that
are not equipped with AccuGrade will have an "L" fitting at this location, connecting the pump-
supply line to the pressure reducing manifold.
Other components identified above are:
E. pump pressure and flow compensator valve
F. fitting for the load sensing signal line (from the signal resolver network)
G. fitting for the case drain line
This implement pump is identical to the implement pump used in the D6R Series II machines
with differential steering.
The steering and implement control
valve stack is mounted to a bracket
inside the right fender, below the right
console in the operator compartment.
The implement valve stack consists of
the inlet manifold (5), the steering valve
(6), the blade lift control valve (7), the
blade tilt control valve (8), the optional
blade angle control valve (A), the ripper
(or winch) control valve (9), and the end
cover (10), EH pilot manifold for tilt and
lift. The blade angle control valve and
the ripper/winch control valve may not
be present, depending on how the
machine is equipped.
5
6
7
8

A
9
28
10
The AccuGrade Boost solenoid valve directs pilot supply oil to an external resolver. The blade
lower solenoid controlled pilot valve also directs pilot supply oil to this same external resolver, in
addition to the pilot supply oil that is directed to the LOWER end of the blade lift control valve.
Pilot supply oil is directed (through the resolver) to the Float Pilot Boost line when either solenoid
is ENERGIZED. The Float Pilot Boost signal line enters the signal resolver network through the
end cover of the valve stack. In either situation, the pump's flow compensator valve senses the
pilot supply oil as a signal and the implement pump will up stroketo maintain margin pressure
above LOW PRESSURE STANDBY pressure. (If the steering valve or another implement valve
sends a higher signal into the resolver network, the highest pressure is sensed by the compensa-
tor valve.)This EH pilot manifold is only present on ARO machines.
15
14
Illustration (A) shows the EH pilot manifold when the operator has moved the thumb rocker switch
to the BLADE ANGLE RIGHT position. The Machine ECM receives the signal from the thumb
rocker switch and sends a corresponding signal to the ANGLE RIGHT solenoid controlled pilot
valve and the solenoid is ENERGIZED. Pilot supply oil is then directed to the appropriate end of
the blade angle control valve.
EH PILOT MANIFOLDS
PRESSURE MANIFOLD
MACHINE
COMPONENT LOCATIONS
IMPLEMENT PUMP
STEERING and IMPLEMENT
CONTROL VALVE
The EH pilot manifold (28) for blade lift and tilt functions is mounted to the outboard side of the
valve stack bracket, if the machine is equipped with AccuGrade.

Components of the AccuGrade EH pilot manifold identified above are the blade raise solenoid, the
blade tilt right solenoid, the AccuGrade Boost solenoid, the blade tilt left solenoid, and the blade
lower solenoid.
The EH pilot manifold receives pilot supply oil from the pressure reducing manifold. The EH pilot
manifold contains four (proportional) solenoid controlled pilot valves that receive PWM signals
from the Machine ECM for operation of the blade lift and the blade tilt functions. When
ENERGIZED, the solenoid controlled pilot valve directs pilot supply oil to the end of the
corresponding implement control valve, in direct proportion to the movement of the dozer control
lever (or as automatically commanded by the AccuGrade system). The EH pilot manifold also
contains the AccuGrade Boost solenoid valve, which uses an ON/OFF solenoid.The AccuGrade
Boost strategy was discussed earlier in the Implement Hydraulics section ofthis presentation.
D6R SERIES III BLADE ANGLE EH PILOT MANIFOLD
D6R SERIES III BLADE TILT AND LIFT EH PILOT MANIFOLD
29
Pilot
supply
Angle Right Angle Left
To Tank
From Pressure
Reducing Manifold
(To Blade Angle Control Valve)
Pilot
supply
Tilt
Right
Blade
Raise
Accugrade
Boost
To Tan k

(Drain)
Tilt
Left
Blade
Lower
To Blade Tilt
Control Valve
(Tilt Left)
To Blade Lift Control Valve
(Blade Lower/Float)
To Float Pilot
Boost Line
To Blade Tilt
Control Valve
(Tilt Right)
Accugrade Boost Line
To Blade Tilt
Control Valve
(Tilt Left)
Service points on the back of the hydraulic oil
tank that are identified above are:
A. Steering implement pump suction port.
B. Valve stack end cover drain port.
C. Hydraulic oil temperature sensor.
D. Pilot valve drain port.
E. Case drain return port (to internal filter).
F. Fitting for hose to hydraulic oil cooler
(via bypass valve).
G. Implement return oil port (to internal filter).
HYDRAULIC OIL TANK

A
F
G
E
D
B
C
24
16
2567
8910
25 26 11 18 29
30
19 13 14 15
3
20
17
21
22 231
2567
8910
18
16
31 20
26
17 23
22
21
24
25 19

11
1329 30 14 15
HA
CP
SOS
CPG
15
Angle Right
Angle Left
(A)
Angle Right
Angle Left
(Drain)
EH PILOT MANIFOLD
EH PILOT MANIFOLD
IMPLEMENT VALVE STACK
The machine will have an EH pilot manifold installed for blade angle control (29) if the machine
is equipped with a VPAT blade. The EH pilot manifold for blade angle control is located in the
forward compartment on the right fender, directly below the pressure reducing manifold. The
ANGLE RIGHT solenoid controlled pilot valve and the ANGLE LEFT solenoid controlled pilot
valve are identified in the picture below.
28
28
29
1
25
28
HA
CP
CPG

SOS
HA
CP
CPG
SOS
HBMA
C
HBMA C
RENR7956-01
24 Page, Color 2
DRAIN / RETURN LINE
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
MAIN PUMP OUTPUT
STEERING CIRCUIT
PACCAR WINCH CIRCUIT
SHUTTLE VALVE CONTROL CIRCUIT
SUPPLY LINE
TILT CYLINDER CIRCUIT
RIPPER CYLINDER CIRCUIT
LIFT CYLINDER CIRCUIT
1
2
3
4
5
6
7
8
1
2

3
4
5
6
7
8
A
B
A
B
C
D
E
F
C
D
E
F
3
4
56
7
8
3
4
56
7
A
B
C

D
E
F
A
B
C
D
E
F
1
2
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Attachment
Air Line
CALLOUTS
ARROW PATTERNS
Taps (Pressure, Sampling, Sensor) by letter
Components by number
Connections by letter
RIPPER OR WINCH
YY
1
AA
RAISE
LOWER
RIPPER

3
4
RIPPER CONTROL
3
4
T
S
WINCH CONTROL
AIR VENT
AIR RELIEF
RAISE
LOWER
TILT RIGHT
TILT LEFT
PAY OUT
HAUL IN
PRESSURE
LIMITER
SIGNAL TO PUMP
RETURN
PUMP DISCHARGE
PRESSURE LIMITER
SUCTION
HOUSING DRAIN
FLOAT PILOT
BOOST SIGNAL
WINCH
DOZ LIFT
DOZ TILT
PACCAR WINCH UNIT

REXROTH MOTOR AA6VM80HA1T
PS
T
CP
ACC
CPG
1
2
3
4
T
S
1
2
3
4
T
S
ELEC. DET.
DOZER LIFT
DOZER TILT
STEERING
DUAL TILT OPTION
1
2
3
4
T
S
1

2
3
4
T
S
ELEC. DET.
DOZER TILT
A2
A1
B2
B1
A2
A1
PILOT SUPPLY
PILOT DRAIN
PILOT SUPPLY
PILOT DRAIN
B2
B1
RIPPER LIFT
C2
C3
C4
C2 C1
D1
D2
B3
B4
B3
B4

C3 C4
D1
D2
SINGLE TILT OPTION
TILT RIGHT
TILT LEFT
TILT RIGHT
TILT LEFT
RAISE
LOWER
C1
C5
C5
FLOAT AND CTCT LS
BOOST SIGNAL
D1
D2
PUMP FLUSHING
CIRCUIT
C1
C2
C3
C4
THIS SCHEMATIC IS FOR THE D6R SERIES III TRACK-TYPE TRACTOR
PART #: 223-1198 CHG 04
Components are shown installed on a fully operable machine with the key and engine off and
transmission shifter in neutral.
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
HA
SOS

CPG
K
C
HB
MB
MA
17
LIFT AND TILT CYLINDERS
CYLINDER CONTROL
LIFT CYLINDERS
1
21
20
22
17
12
29
30
18
25
16
19
10
9
8
7
6
5
2
3

26
11
9
14
15
13
24
27
CP
C1
10
RIPPER
WINCH
FREE SPOOL
HAUL IN
PAY OUT
SIGNAL TO PUMP
PILOT CONTROL
EH SOLENOID VALVES
MAIN RELIEF VALVE
PRESSURE
REDUCING
MANIFOLD
KENR5128-00
30 Page, (Dimensions: 39 inches x 28 inches)
Hydraulic Symbols (Electrical)
Electrical Symbols Table
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)
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
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
A B
P T
A B
P T
SHIFTED POSITION
INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOT
CONTROLLED
T
KENR5128
May 2007
D6T Track-Type Tractor
Hydraulic System
JHB1-UP
ZEB1-UP
SMC1-UP
JWD1-UP
LBD1-UP

LAE1-UP
DJG1-UP
WCG1-UP
WFH1-UP
LKJ1-UP
Standard, Power Angle Tilt, and AccuGrade Options
SNK1-UP
DHL1-UP
KJL1-UP
SKL1-UP
KLM1-UP
GCT1-UP
RLW1-UP
LAY1-UP
RAY1-UP
PEZ1-UP
©
2007 Caterpillar
All Rights Reserved
Printed in U.S.A.
18
9
2
2
23
13
17
1 1611
23
14 2412

19 25
101 102
101 102
2615
2220
108 16 1 11
17
13
21
168
9
2220
2519
17
21 1 10 11 15 26
12 13 14 24
18
3
7
3
6
6
4
5
27
HA
CPG
SOS
CP
HB

JJ
Y1Y2
X1X2
HC
HD
KK
HH
18
2
14
9
12
16
Description
Part
Number
SchematicMachine
LocationLocation
Accumulator Gp - Pilot Oil 200-0750 B-6
Cooler Gp - Hydraulic Oil 169-3806 D-2
Cylinder Gp - Angling 287-1973 F-5
Cylinder Gp - Lift Note A
Note B
Note A
Note A
Note B
Note B
Note B
Note A
Note B

Note B
(STD) 227-0844
(LGP) 227-0843
F-3
(PAT STD) 227-0994
(PAT LGP) 233-0478
Cylinder Gp - Ripper Lift 227-0842 D-2
Cylinder Gp - Tilt (Dual - Angling) 227-0841 F-4
(STD) 233-9134 E-4
(PAT) 227-8893 F-5
Filter Element As - Oil (Hydraulic) 1R-0777 B-3
Filter Gp - Oil (Hydraulic Fan, Steering) 177-6979 E-3
Manifold (For Angle Control) 272-0258 A-4
Manifold Gp - Control (Implement Pilot Pressure) 226-4751 C-6
Motor Gp - Piston (Steering Motor) 269-4749 E-5
Pump Gp - Piston (Implement) 280-7137
(Winch)
271-2116 C-3
(with LS and Cut Off)
278-1445
Pump Gp - Piston (Steering) 271-2114 E-4
Screen (Implement Pilot Oil) 6E-5066 C-6
Tank & Filter Gp - Hydraulic 273-6050 C-3
Valve Gp - Bank 2 (Dozer Lift / Tilt) 269-8161 F-7
Bank 3 (Dozer Lift / Tilt / Ripper) 269-8160 F-7
Bank 3 (Dozer Lift / Tilt / Winch) 269-8157 F-8
Bank 3 (PAT Dozer Lift / Tilt / Angle) 269-8159 D-7
Bank 4 (PAT Dozer Lift / Tilt / Angle / Rip) 269-8158 D-7
Bank 4 (PAT Dozer Lift / Tilt / Angle / Winch) 269-8156 D-8
Valve Gp - Bypass (Cooler) 126-0747 D-3

Valve Gp - Pilot (Dozer Pilot Control) 200-0189 B-3
(Ripper Pilot Control) 167-1177 A-6
(Steering) 9T-8693 E-3
(Winch Pilot Control) 160-0766 B-6
Valve Gp - Quick Drop 227-0831 F-3
Valve Gp - Relief (Steering Lines Pressure)(Cold Oil) 198-9219 D-3
Valve Gp - Solenoid (For Angle Control) 257-0267 A-4
(Hydraulic Lockout) 201-0950
Note C
B-5
Winch Ar F-1
Valve & Mtg Gp - Bulldozer (Grade Control) (EH Solenoid Valve) 239-5317 C-2
Valve (Shuttle Valve) 233-6942 C-1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17

18
19
20
21
22
23
24
25
26
27
101
102
Component Locations
AccuGrade Option
Note A: For S-Blade Equipped Machine.
Note B: For PAT-Blade Equipped Machine.
Note C: Refer to the Parts Manual for your particular machine.
Tap Locations
Pressure, Sampling, and Sensor
Tap
Number
Description
Schematic
Location
HB Implement Pump Signal C-4
HH Filter Outlet E-3
HA Implement Pump Discharge at Valve C-6
HC Left Steering Loop at Motor D-5
HD Right Steering Loop at Motor E-5
JJ Cooler Inlet (Backfill) D-2

KK Filter Inlet (SOS) E-3
X1 Right Steering Actuator E-4
X2 Left Steering Actuator E-4
Y1 Left Steering Pilot D-3
Y2 Right Steering Pilot D-3
CP Pilot Valve Supply B-6
CPG Accumulator C-6
SOS Implement Manifold Oil Sampling Port C-6
MACHINE COMPONENT LOCATIONS
BLADES
LINES GP - PILOT
LINES GP - STEERING
WINCHRIPPER
Standard Dozer Blade
Power Angle Tilt (PAT) - Option
KENR5128-00
30 Page, Color 2, (Dimensions: 39 inches x 28 inches)
THIS SCHEMATIC IS FOR THE D6T (2 PUMPS)
PART #: 265-8972 CHG04
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
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations
DRAIN / RETURN LINE
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
IMPLEMENT PUMP OUTPUT
STEERING AND CHARGE PUMP OUTPUT
PILOT PUMP OUTPUT
WINCH CONTROL CIRCUIT
LOAD SENSING SIGNAL
BLADE LIFT CYLINDER CONTROL CIRCUIT
SUPPLY LINE
BLADE TILT CYLINDER CONTROL CIRCUIT (SINGLE AND DUAL)
BLADE ANGLE CYLINDER CONTROL CIRCUIT
RIPPER CYLINDER CONTROL CIRCUIT
Note A: For S-Blade Equipped Machine.
Note B: For PAT-Blade Equipped Machine.
Note C: Refer to the Parts Manual for your particular machine.
2
3
4
6
7
8
9
A
C
D
E

F
2
34
67
8
9
A
B
C
D
E
F
B
1
1
DR1DR2
DR2
DT3
DT4
RR1
RR2
DR1DR2
DT3
DT4
DR1DR2
DT3
DT4
DA1
DA2
DA1

DA2
HP3
HP4
DR1
FPB
DT3
DT4
RR2RR1
RR1
RR2
A2
A1
HP3 HP4
FS2
FS2
HP3
HP4
HC
LIFT
PAT TILT
WINCH
PAT ANGLE
LEFT SIDE
OF TRACTOR
TOP
ECM
JOYSTICK
THUMB
SWITCH
DOZ ANGLE

LIFT
PAT TILT
RIPPER
PAT ANGLE
ACC
CPG
ACCUMULATOR
PRESSURE
(CPG)
PS
CP
WINCH
SUPPLY
PILOT SUPPLY
T
DOZ RAISE
DOZ TILT
1
2
1
2
3
3
4
4T
T
S
S
LIFT
TILT

WINCH
LIFT
LOWER
RAISE
LOWER
RAISE
LEFT
RIGHT
TILT
RIPPER
RIPPER RAISE
FREE SPOOL HAUL IN/PAY OUT
1 2
1 T S 2
S-BLADE & WINCH S-BLADE & RIPPER
PAT-BLADE & WINCH PAT-BLADE & RIPPER
IMPLEMENT CONTROL VALVE OPTIONS MAIN SCHEMATIC
RIPPER / WINCH CONTROLS
DOZER ANGLE CONTROL
RIPPER OPTION
LIFT / TILT CONTROL
ACCUGRADE OPTION
LIFT / TILT CONTROL
STANDARD
IMPLEMENT
CONTROL
VALVE
OPTIONS
WINCH OPTION
PAT OPTION BLADE TILT OPTIONS

BLADE LIFT
DR1
DR2
FPB
DT3 DT4
R1 R2
R2
R1
R2
R1
BL1
BL2
BL1
BL2
LOWER
LEFT
RIGHT
RAISE
BL1
BL2
LOWER
RAISE
BL1
BL2
LOWER
RELIEF VALVE
RAISE
RIGHT
LEFT
BL1

BL2
T1
LS
S1
T1T1
T1 T1
LS LS
LSLS
S1
S1
S1
S1
S2
S2
W1
W2
W1
W2
W1
W2
BT1
BT2
BT1
BT2
VT1
VT2
VA1
VA2
VT1
VT2

BT1
BT2
T2
T2
VT1
VT2
VA2
VA1
VA1
VA2
BLADE TILT
BLADE ANGLE
LEFT
LEFT
RIGHT
DUAL TILT OPTION
SINGLE TILT OPTION
STEERING MOTOR
STEERING PUMP
STEERING CHARGE FILTER
STEERING PILOT VALVE
RIGHT
LEFT
COOLER BYPASS VALVE
HYDRAULIC
TANK
RIGHT
FPB
FPB
FPB

FLOAT PILOT BOOST SIGNAL
FLOAT PILOT BOOST SIGNAL
FLOAT PILOT BOOST SIGNAL FLOAT PILOT BOOST SIGNAL
COVER
PILOT SUPPLY
IMPLEMENT PUMP
S
X
B
L
PILOT DRAIN
ANGLE LEFT
ANGLE RIGHT
LOWER RAISE
PILOT DRAIN
AIR RELIEF
AIR VENT
RELIEF VALVE
RELIEF VALVE RELIEF VALVE
LEFT
RIGHT
RAISE
LOWER
LEFT
RIGHT
PAY OUT
A
1
2
3

4
B C D
HAUL IN
PAY OUT
HAUL IN
PAY OUT
HAUL IN
MARGIN
BYPASS
1
2
1
T S 2
3
4
3
T S 4
X
G
COVERCOVER
COVER
JJ
HH
KK
HB
Y2
YI
CPG
SOS
HA

CP
HD
X2 X1
DR1
DR2
DT3
DT4
VACUUM
BREAKER
VALVE
(SHUTTLE)
233-6942
VALVE & MTG GP
BULLDOZER
(GRADE CONTROL)
239-5317
CYLINDER GP
RIPPER LIFT
227-0842
WINCH AR
(NOTE C)
VALVE GP
QUICK DROP
227-0831
CYLINDER GP
LIFT
NOTE A
(STD) 227-0844
(LGP) 227-0843
NOTE B

(STD) (PAT) 227-0994
(LGP) (PAT) 233-0478
CYLINDER GP
TILT (DUAL - ANGLING) (NOTE A)
227-0841
CYLINDER GP
TILT (STD) (NOTE A)
233-9134
CYLINDER GP
TILT (PAT) (NOTE B)
227-8893
CYLINDER GP
ANGLING (NOTE B)
287-1973
MOTOR GP
PISTON (STEERING)
269-4749
PUMP GP
PISTON (STEERING)
271-2114
FILTER GP
OIL (HYDRAULIC FAN,
STEERING)
177-6979
VALVE GP
PILOT (STEERING)
9T-8693
COOLER GP
HYDRAULIC OIL
169-3806

VALVE GP
BYPASS
(COOLER)
126-0747
VALVE GP
RELIEF
(STEERING LINES
PRESSURE) (COLD OIL)
198-9219
PUMP GP
PISTON (IMP)
280-7137
(WITH LS AND
CUT OFF)
271-2116
(WINCH)
278-1445
VALVE GP
BANK 3
(DOZ LIFT / TILT / WINCH)
269-8157
VALVE GP
BANK 2
(DOZ LIFT / TILT)
269-8161
BANK 3
(DOZ LIFT / TILT / RIP)
269-8160
VALVE GP
BANK 4

(PAT DOZ LIFT / TILT / ANG / WINCH)
269-8156
VALVE GP
BANK 3
(PAT DOZ LIFT / TILT / ANGLE)
269-8159
BANK 4
(PAT DOZ LIFT / TILT / ANGLE / RIP)
269-8158
FILTER ELEMENT AS
OIL (HYDRAULIC)
1R-0777
TANK & FILTER GP
HYDRAULIC
273-6050
VALVE GP
PILOT
(DOZER PILOT
CONTROL)
200-0189
MANIFOLD
(FOR ANGLE CONTROL)
(NOTE B)
272-0258
VALVE GP
SOLENOID
(FOR ANGLE CONTROL)
(NOTE B)
257-0267
VALVE GP

PILOT
(RIPPER PILOT
CONTROL)
167-1177
VALVE GP
PILOT
(WINCH PILOT
CONTROL)
160-0766
VALVE GP
SOLENOID
(HYDRAULIC LOCKOUT)
201-0950
ACCUMULATOR GP
PILOT OIL
200-0750
MANIFOLD GP
CONTROL (IMPLEMENT
PILOT PRESSURE)
226-4751
SCREEN
(IMPLEMENT
PILOT OIL)
z
SENR8425
8 Page
©
1996 Caterpillar
All Rights Reserved
Printed in U.S.A.

SENR8425
April 1996
D10R Tractor
Hydraulic System
3KR1-UP
A
B
C
D
E
F
G
H
J
SENR8425
8 Page
A
B
C
D
E
F
G
H
J
REN7546-02
24 Page
RENR7546-02
October 2005
D10T Track-Type Tractor

Hydraulic System
RJG1-528
©
2005 Caterpillar
All Rights Reserved
Printed in U.S.A.
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
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
MANUAL SHUTOFF
SHUTTLE PILOT
CONTROLLED
Hydraulic Symbols (Electrical)
Electrical Symbols Table
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
T
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow

Symbol
Electrical Symbols (Electrical)
I
Component Locations
Item
Number
Description
Part
Number
Schematic
Location
STANDARD CONFIGURATION
1
TANK & FILTER GP 211-4364
A-3
2
PUMP GP 228-0272
B-3
3
CYLINDER GP LIFT 9T-2869
F-5
4
CYLINDER GP SINGLE TILT 232-0654
F-4
5
VALVE GP-CONT-5-38(A) DOZER LIFT 234-3025
D-6
6
VALVE GP-RESOLVER 263-3912
E-5, E-6

7
VALVE GP-MTG & E/H PILOT VALVE;
DOZER LIFT & TILT, RIPPER, RV
247-3026
D-4, C-4
8
MANIFOLD GP-CONTROL PILOT PRESSURE AND
RATAAC FAN SPEED CONTROL VALVE
231-6285
B-2, B-3
9
ACCUMULATOR 211-2069
C-2
10
MANIFOLD GP-RELIEF PILOT SUPPLY SELECTOR
AND REDUCER
232-3242
E-2, E-3
11
FILTER GP PILOT SUPPLY FILTER 249-1751
E-2
12
MOTOR GP RATAAC FAN DRIVE 217-7101
B-2
13
BLOCK-BEARING RATAAC FAN BEARING 214-2297
B-1
14
PUMP GP - DEMAND FAN 220-0780
C-1

15
MOTOR GP - DEMAND FAN 212-0272
C-2
16
COOLER GP-HYD OIL - WATER OVER OIL 2W-9978
C-2
17
VALVE GP-COOLER BYPASS 163-1829
C-2
18
VALVE GP-QUICK DROP 4T-4205
F-5, F-6
19
VALVE GP-VACUUM 154-6165
A-4
DUAL TILT OPTION
1A
CYLINDER GP DUAL TILT (LH) 232-0653
F-7
2A
CYLINDER GP DUAL TILT (RH) 232-0652
F-7
3A
VALVE GP-DUAL TILT 225-2321
F-4
RIPPER OPTION
1B
CYLINDER GP RIPPER LIFT (RH) 192-6446
A-6
2B

CYLINDER GP RIPPER LIFT (LH) 192-6445
A-7
3B
CYLINDER GP RIPPER TILT 4T-9977
A-6, A-7
4B
CYLINDER GP RIPPER PIN PULLER 6E-3113
A-5
5B
VALVE GP-RIPPER RIPPER LIFT & TIP 235-3506
B-6
6B
VALVE GP-RESOLVER 263-3912
C-7
7B
VALVE GP-MOUNTING 188-6140
A-5
8B
VALVE GP-RIPPER WARMING (OPTION) 164-4540
C-6
ATUO CARRY OPTION
1C
CYLINDER GP RH LIFT WITH POSITION SENSING 231-0865
F-5
2C
VALVE GP-DIVERTER FOR CRUISE CONTROL OPT 164-4536
B-4
REVERSING DEMAND FAN OPTION
1D
MOTOR GP- NO ANTI-CAV VALVE ( BI-DIRECTIONA 212-4977

C-2
2D
VALVE GP-DVTR REVERSING FOR DEMAND FAN 229-1466
E-1
REFERENCE SENSORS AND SWITCH
E2
TRANSDUCER-PRESSURE 237-0957
C-1
E3
TRANSDUCER-PRESSURE 237-0957
B-6
Tap Locations
Pressure, Sampling, and Sensor
Tap
Number
Description
Schematic
Location
HPD1
PUMP DISCHARGE 1
B-3
HPD2
PUMP DISCHARGE 2
B-3
HPD3
PUMP DISCHARGE 3
B-4
HPS
PILOT SUPPLY
E-2

HPDR
PILOT LIFT RAISE
D-3
HPDL
PILOT LIFT LOWER
D-5
HPTL
PILOT TILT LEFT
D-3
HPTR
PILOT TILT RIGHT
D-5
HPRR
PILOT RIPPER RAISE
C-5
HPRL
PILOT RIPPER LOWER
C-3
HPSI
PILOT SHANK IN
C-3
HPSO
PILOT SHANK OUT
C-5
HFPD
FAN PUMP DISCHARGE
B-3
HFMI
FAN MOTOR INLET
B-3

FS
FLUID SAMPLING
A-3
HDFP
DEMAND FAN PUMP DISCH.
C-2
HPRV
RV PRESSURE SIGNAL
E-5
EU VACUM BREAKER PACKAGE
1F
VALVE GP-VACUUM 117-9152
A-4
RU
TR
TI
TL
RD
RV
TO
DR
DL
- blade raise, or dozer raise solenoid (DR)
- engine overspeed solenoid, or PCO valve (RV)
- blade tilt left solenoid (TL)
- blade tilt right solenoid (TR)
- blade lower/float, or dozer lower/float solenoid (DL)
- ripper shank out, or tip out solenoid (TO)
- ripper lower, or ripper down solenoid (RD)
- ripper shank in, or tip in solenoid (TI)

- ripper raise, or ripper up solenoid (RU)
HPDL
To Blade Tilt
Control Valve
(Blade Tilt Right)
To Ta nk
Drain From Pressure
Reducing Manifold
Pilot Supply From
Pilot Filter / Pressure
Reducing Manifold
To Bl ad e L ift
Control Valve
(Blade Raise)
To PC O Valv e
To Blade Tilt
Control Valve
(Blade Tilt Right)
To Blade Lift
Control Valve
(Blade Lower/Float)
To Ri pp er Tip
Control Valve
(Shank Out)
To Ripper Lift
Control Valve
(Ripper Lower)
To Ripper Tip
Control Valve
(Shank In)

To Ripper Lift
Control Valve
(Ripper Raise)
DL =
HPDR
DR =
HPSO
TO =
HPRL
RV =
HPDL
RD =
HPTL
TL =
HPSI
TI =
HPTR
TR =
HPRR
RU =
MANIFOLD GP - PILOT
A. hydraulic lines to/from the dozer tilt cylinders
B. hydraulic lines to/from the dozer lift cylinders
C. lift pump pressure sensor
D. lift pump supply to the dozer lift valve
E. tilt pump pressure sensor
F. return oil manifold from all implement cylinders to tank (dozer valve and ripper valve)
G. return oil passage from ripper valve
H. tilt pump supply to the dozer tilt valve
J. high pressure supply passage to the ripper valve (combined when not using tilt valve)

DOZER CONTROL VALVE
RIPPER CONTROL VALVE
5B
5
B. high pressure line from tilt control valve
C. case drain line
D. pilot supply line from the RATAAC fan speed control valve
E. dual tilt solenoid
F. high pressure line from tilt control valve
G. line connections to the left tilt cylinder
H. line connections to the right tilt cylinder
MACHINE COMPONENT AND TAP LOCATIONS
A
B
C
D
E
F
G
H
J
A
B
C
D
E
F
A
B
D

C
8
A. pressure reducing manifold
B line from the logic valve resolver circuit
C. high pressure supply from the pilot pressure and RATAAC fan speed control valve
D. pilot supply oil to the remote mounted pilot oil filter
E. implement lockout valve solenoid
F. drain to tank
G. pilot relief valve
H. dead electric lower valve (screw and locknut)
J. pressure reducing valve
K. diverter valve
(HPS). Hydraulic Pilot Supply pressure tap
8B
6B
8B
4
6B
1D
10
3B
5
5B
2B
D
C
B
A
E
F

GHJK
HPS
PRESSURE REDUCING MANIFOLD
10
DIVERTER VALVE (AUTOCARRY)
2C
IMPLEMENT PUMP
2
DUAL TITL VALVE
3A
HYDRAULIC OIL COOLER
16
1B
A
7
HPRVHPDLHPTR
HPRRHPSOHPDR
HPTL HPSI
2A
2A
1A
3B
1B
2B
17
E2
8
E2
4B
3

3
1
1
2
2
6
4B
8
9
9
7B
7B
3A
3A
7
5
5B
11
11
1C
1C
1F
1F
2C
2C
1D
2D
2D
E3
E3

14
14
12
1213
13
15
15
16
16
17
*18
19
19
HPD1 HPD2
HPD3
HPD1 HPD2
HPS
HPD3
HFPD
HFPD
HFMI
HFMI
FS
FS
HDFP
HDFP
10
HPRVHPDLHPTR
HPRRHPSOHPDRHPTL
HPSI

6
HPS
HPD3
B
A
HPD1
D
HPD2
HFPD
HFMI
B
C
E
A
B
C
D
E
F
H
G
A
C
D
B
*18
*18
NOTE:
*18-Quick Drop Valve is
not available on machines

equipped with Autocarry
A. high pressure supply hose (connects to the front of the valve - not visible here)
B. return oil from ripper cylinders (connects to the return oil manifold - see illustration #92)
C. ripper shank in/shank out valve section
D. ripper raise/lower valve section
E. hydraulic oil passages to/from the right ripper lift cylinder (other side - left cylinder)
F. hydraulic oil passages to/from the right ripper shank cylinder (other side - left cylinder)
On machines with a cold weather arrangement, a ripper warming valve is attached to the ripper valve. The warming
valve allows a small amount of oil to circulate through the valve and return to tank. This prevents thermal shock
from occuring inside the valve.
The ripper control valve is shown in the
illustration to the right. It is mounted to the rear of
the main case, just above the transmission
inspection cover and just below the fuel tank. It
controls the following functions:
RIPPER RAISE,
RIPPER LOWER,
RIPPER SHANK IN,
RIPPER SHANK OUT.
It is supplied oil from the lift and tilt sections of
the implement pump (when a blade tilt function is
not activated). Service points identified in the
illustration to the right:
Shown to the right is the dozer control valve. It is
mounted to the inside of the right fender, just above
the right frame rail. It may be accessed by
removing the floor plates in the operator
compartment. It controls the following functions:
BLADE RAISE,
BLADE LOWER/FLOAT,

TILT RIGHT,
TILT LEFT.
The dozer control valve is supplied oil from the lift
and tilt sections of the implement pump. When
raising or lowering the blade, the oil from both
sections of the pump are combined. When tilting
the blade left or right, the oil from the two sections
are segregated so that only the oil from the tilt
section of the implement pump is used for tilt and
the oil from the lift section of the implement pump
is used for r aising and lowering the blade. Service
points identified in the illustration above are:
Major components in the hydraulic system are located under the operator platform and may be
accessed by removing the floor plates in the operator compartment (except the ripper valve).
The dozer control valve (A) is mounted to the inside of the right fender and just above the right
frame rail. It can be accessed through the floor plates in the operator compartment.
The ripper valve (B) is mounted to the rear of the main case, just below the center of the fuel
tank.
The EH pilot manifold (C) is located on top of the main case, just below the floor plates in the
operator compartment.
The pressure reducing manifold (D) is located on the front of the main case, just below the EH
pilot manifold.
For machines equipped with dual tilt, the dual tilt valve (A) is mounted to the
inside of the radiator guard, and just behind the left grill door. The dual tilt
valve allows the operator to tilt the blade right and left, pitch (dump) the
blade forward, and rack the blade back. The dual tilt valve is standard on
machines equipped with Auto Blade Assist and/or AutoCarry. Service
points identified in the above illustration are:
The hydraulic oil cooler (A) is located beneath the radiator guard. The
illustration to the left shows a view from the front of the radiator guard.

Return oil from the demand fan enters the cooler at the cooler inlet (B).
The cooler bypass valve is contained inside the housing (C).
The bypass valve is pressure activated, only. The thicker (more viscous)
oil creates more pressure, which causes the bypass valve to open when
the oil is cold. This allows most of the oil to bypass the cooler. Once the oil
is warm (less viscous), the pressure is less for the same volume of oil and
the bypass valve remains closed. All of the oil f rom the demand fan motor
will then pass through the cooler.
All of the oil exits the cooler, or the bypass valve, through the cooler outlet
(D) and returns to the hydraulic tank in either condition.
The three-section fixed displacement gear-type implement pump is
mounted to the rear of the flywheel housing, at the upper right. This pump
supplies oil to the implement valves, the RATAAC fan system, and the
pressure reducing manifold.
The lift (front) section (A) supplies oil to the blade lift section of the dozer
control valve and to the ripper control valve. Pump discharge from the lift
section is through the forward pump outlet port (9). Discharge pressure for
the lift section (HPD1) may be tested at the forward pressure test port.
The tilt section (B) supplies oil to the blade tilt section of the dozer control
valve. Pump discharge from the tilt section is through the middle pump
outlet port (E). Discharge pressure for tilt section (HPD2) may be tested at
the middle pressure test port.
The rear section of the implement pump (C) supplies oil to the RATAAC
fan motor through the pilot pressure and RATAAC fan speed control valve
(D). The rear section also provides oil to the pressure reducing manifold.
This oil is pilot oil for the EH pilot manifold and for the dual tilt valve. The
two discharge pressure test ports on the RATAAC fan speed control valve
are used to test Fan Pump Discharge Pressure (HFPD) and Fan Motor
Present on machines with AutoCarry is the diverter
valve (A). It is installed at the front, left of the main,

near the bottom. When the AutoCarry mode is
active, the solenoid valve (B) is energized and
directs the flow from the lift (large) pump back to
tank. The tilt pump is then the sole supply of oil
used for making automatic height adjustments to
the dozer blade during the carry cycle. Lift pump
pressure (HPD3) at the diverter valve may be
checked using the pressure tap on the front of the
diverter valve.
The pressure reducing manifold is
located on the front of the main case,
below the EH pilot manifold. Service
points shown in the illustration above
are:
RENR7546-02
24 Page, Color 2
DRAIN / RETURN LINE
LINES GROUP COLOR DESCRIPTIONS
IMPLEMENT PUMP (LIFT)
IMPLEMENT PUMP (TILT)
RIPPER CYLINDER CIRCUIT
IMPLEMENT PUMP (PILOT and RATAAC FAN)
TILT CYLINDER CIRCUIT
RESOLVER CIRCUIT
PCO VALVE
SUPPLY LINE
LIFT CYLINDER CIRCUIT
DEMAND FAN PUMP CIRCUIT
PIN PULLER (RIPPER)
THIS SCHEMATIC IS FOR THE D10T TRACK-TYPE TRACTOR

Part #: 216-8706 CHG 03
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
CIRCUIT WITHOUT RIPPER
4B
7B
7
1A
3
18
18
3
HDFP
4
9
11
HFPD
HFMI

12
E1
2
19
1
HPD2
HPDI
3B
2B
1B
3B
8B
5B
3A
6
5
FS
13
14
16
17
15
(P)
(C1)
(T)
(C2)
2D
8
2C
1D

2A
1C
HPD3
1F
TO PTO
PUMP
(C3)
(C4)
C3
C4
SINGLE TILT OPTION
6
6B
6B
10
HPS
E3
E3
HPDL
HPDR
LOWER/FLOAT
RAISE
HPRV
HPTL
(RV) PCO VALVE
TILT LT
HPRR
HPRL
RIP UP
RIP DOWN

HPSO
HPSI
TIP OUT
TIP IN
HPTR
TILT RT
S1=PITCH
S2=SINGLE TILT
DEFAULT=DUAL TILT
S2
S1
TANK
SUPPLY
(TRANS)
)(
P
C1
C2
T
E2
1
2
3
4
5
6
7
A
B
C

D
E
F
1
23
4
56
7
A
C
D
E
F
B
6
KENR5152
20 Page, Color 2, (Dimensions: 39 inches x 24 inches)
THIS SCHEMATIC IS FOR THE D6K TRACK-TYPE TRACTOR
PART #: 271-6363 CHG 00
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
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations
DRAIN / RETURN LINE
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
IMPLEMENT PUMP CIRCUIT
WINCH PUMP CIRCUIT
STEERING MOTOR CIRCUIT
PILOT PUMP CIRCUIT
DRIVE PUMP CIRCUIT
SUPPLY LINE
ANGLE CYLINDER CIRCUIT
WINCH CIRCUIT
BRAKE CIRCUIT
RIPPER CYLINDER CIRCUIT
TILT CYLINDER CIRCUIT
LIFT CYLINDER CIRCUIT
2
3
4
6
7
8
9
A
C
D
E
2

34
67
8
9
A
B
C
D
E
B
1
1
5
5
RIGHT MOTOR
LEFT MOTOR
15µ
TO CLR
FROM CLR
P
PC1
MU
MC1
PB
PC2
T
MU
MC2
PS
A

B
A
B
HYSTAT
CUTOFF
BRAKE
RELEASE
X2
X1
X2
X1
FE
FA
Y
MB
FA
Y
MB
B
T
A
B
A
T
S
G
COR
COR
CHRG
G

COR
COR
CHRG
ACTR
ACTR
MA
MA
R
G
+
T
U
G
+
T
U
ENGINE
CW
MIN
MAX
DA
BRAKEF/S
G
T
U
X
T M1
B
A
BFS

BRAKE
FREE SPOOL
REEL OUT
REEL IN
CONTROL
PRESS.
DRIVE
AWAY
T
P1
P
DRIVE AWAY FLOW
THROTTLING VALVE
B
A
FE
FA
A
S
T
R
G
B
MH PS
CHRG
COR
COR
POR
ACTR
X1

X2
Y
LIFT
ANGLE
RIPPER
TILT
RAISE
HOLD
LOWER
FLOAT
RAISE
LOWER
LEFT
RIGHT
RAISE
LOWER
LEFT
RIGHT
P
LS
T
LS BOOST
A
B
A
B
A
B
A
B

D
M2
M2
T
HST
P
M1
M1
T
HST
P
L
B
B
ECM: A4MI
SOFTWARE:
ELECTRONIC
CONTROL MODULE
CONTROL LEVER OPT:
IMPL JOYSTICK: REF 253-9544
HYSTAT JOYSTICK: REF 284-8207
S
L1
B2
B
X
L
31A
31
30

20
P16
P15
P14
R5
P19
P20
P18
P23
P22
R7
R13
R3
R10
R2
R1
R4
P21
R12
P8
R6
R11
R9
22
10
6
8
5
7
3

4
24
1
21
2
24
24
23
25
NO. PART NO. NAME
IMPL
1 246-9876 PUMP GP (IMPLEMENT)
2 249-8600 PUMP GP (WINCH)
3
244-7115 VALVE GP (LIFT/TILT/ANGLE)
246-8498 VALVE GP (LIFT/TILT/ANGLE/RIPPER - OPTION)
4 226-0420 ACCUMULATOR
5 269-2730 CYLINDER GP-LIFT
6 269-2729 CYLINDER GP-TILT
7 269-2728 CYLINDER GP-ANGLE
8 227-0842 CYLINDER GP-RIPPER
9 292-8012 VALVE GP (BACK PRESSURE)
10 297-1422 MOTOR GP-WINCH (WINCH MOTOR & VALVE AS.)
HYSTAT
20 243-6637 PUMP GP
21 243-6639 MOTOR GP - LH
22 243-6640 MOTOR GP - RH
23 253-1803 VALVE GP (RETURN MANIFOLD)
24 264-2995 CHARGE FILTER
25 185-4026 VALVE GP (CHECK VALVE)

26 240-8543 CORE ASSEMBLY (OIL COOLER)
FAN
30 256-2287 MOTOR GP
31 252-7008 MANIFOLD GP (FAN MANIFOLD)
31A 285-7460 MANIFOLD GP (REV MANIFOLD - OPTION)
MISC
40 246-7379 TANK GP
41 202-6625 SUCTION SCREEN
42 183-3873 BREATHER
COMPONENT LIST
PRESSURE TAPS
REMOTE PRESS PORTS
RI WINCH PUMP 'Mb' PORT
R2 WINCH PUMP 'G' PORT
R3 IMPL PUMP SIGNAL PRESS 'LS' PORT
R4 REAR PUMP 'G' PORT
R5 FRONT PUMP CASE PRESS PORT
R6 FRONT PUMP 'Mb' PORT
R7 WINCH PUMP 'Ma' PORT
R8 PARK BRAKE PRESS PORT
R9 FRONT PUMP 'G' PORT
R10 FAN PUMP OUTLET PRESS
R11 IMPL PUMP OUTLET PRESS
R12 REAR PUMP 'Mb' PORT
R13 IMPL PUMP FILLING PORT
LOCAL PRESS PORTS
P14 FRONT PUMP 'MA' PORT
P15 FRONT PUMP 'X1' PORT
P16 FRONT PUMP 'X2' PORT
P18 REAR PUMP 'MA' PORT

P19 REAR PUMP 'X1' PORT
P20 REAR PUMP 'X2' PORT
P21 REAR PUMP 'Y' PORT
P22 WINCH PUMP X1
P23 WINCH PUMP X2
TAP
NUMBER
DESCRIPTION
REV MANIFOLD - OPTION
WINCH - OPTION
T
40
41
9
42
26