This document provides a schematic and definitions for the hydraulic system of D3G, D4G, and D5G track-type tractors. It includes a key for line patterns, callouts, component locations listed with part numbers, tap locations listed by letter, and a schematic diagram of the hydraulic circuit layout and components.

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Schematic Symbols
and Definitions page
INTERACTIVE SCHEMATIC
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EC-C3
EC-C2 E-C60
EC-C1
E-C61
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Pressure
Switch
Temperature
Switch
Level
Switch
Flow
Switch Circuit Breaker
T
ELECTRICAL SYMBOLS
Spring
(Adjustable)
Variability
Fluid
Conditioner
Pump
or Motor
BASIC HYDRAULIC
COMPONENT SYMBOLS
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2. SCHEMATIC SYMBOLS AND DEFINITIONS
HYDRAULIC SYMBOLS - ELECTRICAL
Transducer
(Fluid)
Transducer
(Gas / Air)
G
Generator Electrical
Wire
Pressure
Switch
M
Electric
Motor
Pressure Switch
(Adjustable)
Temperature
Switch
Pressure
Switch
Temperature
Switch
Level
Switch
Flow
Switch Circuit Breaker
T
ELECTRICAL SYMBOLS
Spring
Control
Valves
Restriction Line Restriction
(Fixed)
2-Section
Pump
MAIN AUX.
Spring
(Adjustable)
Variability
Line Restriction
(Variable)
Pressure
Compensation
Pump: Variable and
Pressure Compensated
Hydraulic Pneumatic
Energy Triangles
Fluid
Conditioner
Attachment
Pump
or Motor
BASIC HYDRAULIC
COMPONENT SYMBOLS
Line Restriction
Variable and Pressure
Compensated
Vented Pressurized Return Above Fluid Level Return Below Fluid Level
FLUID STORAGE RESERVOIRS
Pressure Temperature Flow
MEASUREMENT
Unidirectional Bidirectional
ROTATING SHAFTS
One Position Two Position Three Position
Two-way Three-Way Four-Way
ENVELOPES
PORTS
CONTROL
Basic
Symbol
Spring
Loaded
Normal Position
A B
P T
A B
P T
Shifted Position Infinite Position
Shuttle Pilot
Controlled
VALVES
CHECK
Solenoid
or Manual
Solenoid
and Pilot
Solenoid and
Pilot or Manual
Solenoid Servo Thermal Detent
COMBINATION CONTROLS
T
Fuse: A component in an electrical circuit that will open the circuit if too much current flows through it.
Switch (Normally Open): A switch that will close at a specified point (temp, press, etc.). The circle indicates
that the component has screw terminals and a wire can be disconnected from it.
Switch (Normally Closed): A switch that will open at a specified point (temp, press, etc.).
No circle indicates that the wire cannot be disconnected from the component.
Ground (Wired): This indicates that the component is connected to a grounded wire.
The grounded wire is fastened to the machine.
Ground (Case): This indicates that the component does not have a wire connected to ground.
It is grounded by being fastened to the machine.
Reed Switch: A switch whose contacts are controlled by a magnet. A magnet closes the contacts of
a normally open reed switch; it opens the contacts of a normally closed reed switch.
Sender: A component that is used with a temperature or pressure gauge.
The sender measures the temperature or pressure.
Its resistance changes to give an indication to the gauge of the temperature or pressure.
Relay (Magnetic Switch): A relay is an electrical component that is activated by electricity.
It has a coil that makes an electromagnet when current flows through it.
The electromagnet can open or close the switch part of the relay.
Solenoid: A solenoid is an electrical component that is activated by electricity.
It has a coil that makes an electromagnet when current flows through it.
The electromagnet can open or close a valve or move a piece of metal that can do work.
Magnetic Latch Solenoid: An electrical component that is activated by electricity and held latched by a
permanent magnet. It has two coils (latch and unlatch) that make electromagnet
when current flows through them. It also has an internal switch that places
the latch coil circuit open at the time the coil latches.
BASIC ELECTRICAL COMPONENT SYMBOLS
Push-pull Lever PedalGeneral Manual Push Button SpringManual Shutoff
MANUAL CONTROL
External Return Internal Return
Simplified Complete
Internal
Supply Pressure
RELEASED PRESSURE
REMOTE SUPPLY PRESSURE
PILOT CONTROL
Spring Loaded Gas Charged
ACCUMULATORS
Crossing Joining
LINES
Double ActingSingle Acting
CYLINDERS
Unidirectional
Bidirectional
FIXED DISPLACEMENT
VARIABLE DISPLACEMENT
NON- COMPENSATED
PUMPS
Unidirectional
Bidirectional
Unidirectional
Bidirectional
FIXED DISPLACEMENT
VARIABLE DISPLACEMENT
NON- COMPENSATED
MOTORS
Unidirectional
Bidirectional
Two
Position
Infinite
Positioning
FLOW IN ONE
DIRECTION
FLOW ALLOWED IN
EITHER DIRECTION
Three
Position
CROSS
FLOW
PARALLEL
FLOW
INTERNAL PASSAGEWAYS
1
2
AG-C4
111-7898
L-C12
3E-5179
9X-1123
Component
Part Number
Pin or Socket Number
Part Number: for
Connector Plug
Harness Identification Letter(s): (A, B, C, AA, AB, AC, ...)
Plug
325-AG135 PK-14
Wire Color
Wire Gauge
Receptacle
1
1
2
2
Sure-Seal connector: Typical representation
of a Sure-Seal connector. The plug and receptacle
contain both pins and sockets.
Deutsch connector: Typical representation
of a Deutsch connector. The plug contains all
sockets and the receptacle contains all pins.
Fuse (5 Amps)
5A
Harness identification code:
This example indicates wire group 325,
wire 135 in harness "AG".
L-C12
3E-5179
Wire, Cable, or Harness Assembly Identification:
Includes Harness Identification Letters and Harness
Connector Serialization Codes (see sample).
Harness Connector Serialization Code: The "C" stands for
"Connector" and the number indicates which connector in the
harness (C1, C2, C3, ...)
HARNESS AND WIRE SYMBOLS

3. D3G: D4G: D5G:
FDW1-UP
FDH1-UP
RKG1-UP
WGB1-UP
TLX1-UP
CFN1-UP
HYD1-UP
FDC1-UP
BYR1-UP
JMH1-UP
CFF1-UP
CFC1-UP
Hydraulic System
D3G, D4G, and D5G Track-Type Tractor
© 2016 Caterpillar
All Rights Reserved
CAT, CATERPILLAR, their respective logos, “Caterpillar Yellow”, and the POWER EDGE trade dress as well as
corporate and product identity used herein, are trademarks of Caterpillar and may not be used without permission.
March 2016
RENR7316-02

4. COMPONENT LOCATION
Description
Part
Number
Schematic
Location
Machine
Location
Block - Return Manifold 179-6053 I-11 1
Block Gp - Oil Cooler And Motor Bearing 175-5473 H-4 2
Block As - Suction Manifold 177-3572 I-8 3
Cooler Gp - Oil 317-4354 H-4 4
Cylinder Gp - Angle 259-0459
Cylinder Gp - Angle (Japanese) 264-8944
Cylinder Gp - Bulldozer Lift 183-3721 H-4, G-4 6
Cylinder Gp - Ripper (LH) 192-0893 E-12 7
Cylinder Gp - Ripper (RH) 192-0891 E-12 8
Cylinder Gp - Tilt 183-8459 H-3 9
Filter Gp - Oil (Winch Pump) 201-2744 G-10 10
Filter Gp - Oil (Rear pump) 196-1803 G-8 11
Filter Gp - Oil Transmission (SOS Valve) 212-9363 G-7 12
Test Gp - Pressure Test Remote Mounted (D3G) 174-5987
Test Gp - Pressure Test Remote Mounted (D4G , D5G) 221-9805
Manifold Gp 199-3475 E-5 14
Motor Gp - Piston (D4G,D5G,Right Motor) 169-2976 F-9 15
Motor Gp - Piston (D3G Left Motor) 214-6343 J-9 16
Motor Gp - Piston (D3G Right Motor) 214-6343 E-9 17
Motor Gp - Piston (55CC) 200-1729 A-8 18
Pump Gp - Implement 137-1296
Pump Gp - Implement (Japanese) 147-1057
Pump Gp - Double Piston (D4G,D5G Thru Drive) 215-9302
Pump Gp - Double Piston (D4G,D5G Without Thru Drive) 214-3243
Pump Gp - Double Piston (D3G Thru Drive) 236-4666
Pump Gp - Double Piston (D3G Without Thru Drive) 236-4667
Pump Gp - Piston (Winch) 178-4415 G-10 20
Screen - Suction 322-9703 I-11 21
Switch As - Pressure (Parking Brake) 201-4159 J-10 22
Tank Gp 194-3098 J-11 23
Valve (Shutoff) 4Y-3876 E-7 24
Valve Gp - Ball (Winch) 8T-6907 C-11 25
Valve Gp - Bank 3 (Power Beyond Grade Control) 243-3165
Valve Gp - Bank 3 (ST) 216-1633
Valve Gp - Bank 4 (ST) 216-1634
Valve Gp - Check Lift 9T-7634 F-6 27
Valve Gp - Check Ripper 9T-7634 F-7 28
Valve Gp - Control (Angle) 9T-7642 E-6 29
Valve Gp - Control (Lift) 199-3476 E-6 30
Valve Gp - Control (Tilt) 9T-7642 E-5 31
Valve Gp - Counterbalance 225-9596 D-4 32
Valve Gp - Flow Control 200-1311 A-10 33
Valve Gp - Grade Control Valve (Bank 2) 225-9595 C-1 34
Valve Gp - Line Relief (Ripper) 185-7709 F-6 35
Valve Gp - Main Relief 199-3478 E-5 36
Valve Gp - Pressure Relief 4T-4145 J-11 37
Valve Gp - Ripper (Auxiliary) 199-3477 E-7 38
Valve Gp - Shuttle 8J-6875 C-11 39
Valve Gp - Solenoid (Brake,Override) 200-6492 I-7 40
Valve Gp - Winch Logic Block 200-1309 D-10 41
Valve Gp - Winch Pilot 180-7339 D-11 42
Winch Group 179-9513 D-8 43
5
13
19
26
I-3, F-3
I-6
H-5
E-5
G-6 44

5. TAP LOCATION
Tap
Number
Description
Schematic
Location
AA Winch Pump - Case Drain Port G-10
BB Rear Pump - Case Drain Port G-9
CC Front Pump - Case Drain Port G-7
CL Hydraulic Oil Cooling Loop I-5
FCG Front Pump Charge Pressure I-5
IP Implement Pump Pressure I-5
LAB Front Pump Pressure Port I-5
M1 Winch Motor Control Pressure B-9
PB Parking Brake Pressure Port J-5
PC Rear Pump Drain Pressure Port I-5
RAB Rear Pump Pressure Port I-5
RCG Rear Pump Charge Pressure I-5
SOS Oil Sampling G-7
WAB Winch Pump Pressure Port I-6
WCG Winch Pump Charge Pressure I-6

6. Components are shown installed on a fully operable machine with the key and engine off, transmission shifter
in neutral and with parking brake set.
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
SCHEMATIC PART NUMBER: 213-6413, CHANGE: 04, VERSION: -
HYDRAULIC SYSTEM
THIS SCHEMATIC IS FOR THE D3G, D4G, AND D5G TRACK-TYPE TRACTOR
MEDIA NUMBER: RENR7316-02
Refer to the Parts Manual using a specific serial number prefix in SIS before ordering parts from this schematic.
A
B
C
D
E
F
1234567891011121314
G
H
I
J
1234567891011121314
A
B
C
D
E
F
G
H
I
J
Attachment
Air Line
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
CALLOUTS
Taps (Pressure, Sampling, Sensor - by letter)YY
Connectors (By letter)DL DL D
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
PILOT PUMP CHARGE CIRCUIT
MAIN PUMP OUTPUT
WINCH MOTOR CIRCUIT
REAR PUMP CHARGE CIRCUIT
STEERING CIRCUIT
SUPPLY LINE
BRAKE CIRCUIT
ANGLE CYLINDER CIRCUIT
LIFT CYLINDER CIRCUIT
DRAIN / RETURN LINE
WINCH PUMP CHARGE CIRCUIT
TILT CYLINDER CIRCUIT
RIPPER / AUXILLARY CYLINDER CIRCUIT
WINCH CONTROL VALVE CIRCUIT
WAB WCG
CL PB
RCG
RAB
FCG
IP
LAB
SOS
CC
BB
AA
M1
PC
WINCH ARRANGEMENT
RIPPER
RIPPER
RIGHT MOTOR
LEFT MOTOR
FLUSHING
VALVE
FLUSHING
VALVE
LIFT
LIFT
ANGLE
TILT
ANGLE
CCW
X1X2AFAFEX1X2FE FA AY2 Y1 FEA FA
WINCH
PUMP
S T R G G1 B MH PS
CHRG
R&R
R&R
POR
ACTR
S T R G G1 B MH PS PS1
R&R
CHRG R&R
POR
ACTR
CW
CHRG
R&R
R&R
POR
ACTR
S T R G G1 B MH PS PS1
CASE
FILL
BYPASS
SWITCH
A
T
U
M1
B
G
A
T
U
M1
B
G
CASE
FILL
BYPASS
SWITCH
Front Pump Case Fill
BYPASS
SWITCH
RIPPER ANGLE LIFT TILT
A B A A AB B B
R
R
R
R
H H
L
L
H
L
F
H
L
FLOAT
DETENT
ENGINE
AIR VENT-VACUUM
MICRON
AIR RELIEF
TO GRADE
CONTROL HYD.
VALVE - TILT
SECTION
PLUG ENABLES
POWER BEYOND
MIN
MAX
P
T
1 32 4
2
3
4
3
2 4
1
11
(DA)
BRAKE F/S
G T
UXT
B
A
(B)
(FS)F/S
BRAKE
(2)
(P)
(Y)
(4)
R/OR/I
FREE SPOOL
BRAKE OFF
REEL OUT
REEL IN
WINCH MOTOR
CONTROL
PRESSURE
LIFT TILT
A BA B
PT
LS
M
9T-7642
179-9513
(D4G,D5G EP PUMP THRU DRIVE) - 215-9302
(D4G,D5G WITHOUT THRU DRIVE) - 214-3243
(D3G WITHOUT THRU DRIVE) - 236-4667
(D3G WITH THRU DRIVE) - 236-4666
194-3098
9T-7634
(18) MOTOR GP
PISTON (55CC)
200-1729
(33) VALVE GP
FLOW CONTROL
200-1311
(1) BLOCK
RETURN MANIFOLD
179-6053
(7) CYLINDER GP
RIPPPER (LH)
192-0893
(8) CYLINDER GP
RIPPPER (RH)
192-0891
(3) BLOCK AS
SUCTION MANIFOLD
177-3572
(44) PUMP GP - DOUBLE PISTON
(24) VALVE
(SHUTOFF)
4Y-3876
(38) VALVE GP
RIPPER (AUXILIARY)
199-3477 (29) VALVE GP - CONTROL (30) VALVE GP - CONTROL
LIFT
199-3476
(31) VALVE GP - CONTROL
TILT
9T-7642
(14) MANIFOLD GP
199-3475
(36) VALVE GP
MAIN RELIEF
199-3478
(26) VALVE GP
BANK 3 : 216-1633 (ST)
BANK 4 : 216-1634 (ST)
BANK 3 : 243-3165
POWER BEYOND GRADE CONTROL
(6) CYLINDER GP
BULLDOZER LIFT
183-3721
(9) CYLINDER GP
TILT
183-8459
(5) CYLINDER GP
ANGLE (2 REQ)
259-0459
264-8944 (JAPANESE MACHINE)
(5) CYLINDER GP
ANGLE (2 REQ)
264-8944 (JAPANESE MACHINE)
259-0459
(28) VALVE GP
(27) VALVE GP
CHECK
(LIFT)
9T-7634
(35) VALVE GP
LINE RELIEF
(RIPPPER)
185-7709
(12) FILTER GP
OIL TRANSMISSION (SOS VALVE)
212-9363
(19) PUMP GP
IMPLEMENT
137-1296
147-1057 (JAPANESE)
(4) COOLER GP
OIL
317-4354
(2) BLOCK GP
OIL COOLER AND
MOTOR BEARING
175-5473
(42) VALVE GP
WINCH PILOT
180-7339
(25) VALVE GP
BALL (WINCH)
8T-6907
(39) VALVE GP
SHUTTLE
8J-6875
(41) VALVE GP
WINCH LOGIC BLOCK
200-1309
(43) WINCH GROUP
(23) TANK GP
(21) SCREEN
SUCTION
322-9703
(37) VALVE GP
PRESSURE RELIEF
4T-4145
(22) SWITCH AS
PRESSURE
(PARKING BRAKE)
201-4159
(16) MOTOR GP
PISTON
214-6343 (D3G EP)
169-2976 (D4G,D5G)
(40) VALVE GP
SOLENOID (BRAKE,OVERRIDE)
200-6492
(13) TEST GP
PRESSURE TEST
REMOTE MOUNTED
174-5987 (D3G)
221-9805 (D4G,D5G)
(20) PUMP GP
PISTON (WINCH)
178-4415
(10) FILTER GP
OIL (WINCH PUMP)
201-2744
(11) FILTER GP
OIL (REAR PUMP)
196-1803
(15) MOTOR GP
169-2976 (D4G,D5G)
(17) MOTOR GP
214-6343 (D3G)
(32) VALVE GP
COUNTERBALANCE
225-9596
(34) VALVE GP
BANK 2 : 225-9595
(GRADE CONTROL VALVE)
ANGLE
CHECK RIPPER
Do not operate or work on this product unless you have
read and understood the instruction and warnings in the
relevant Operation and Maintenance Manuals and
relevant service literature. Failure to follow the instruc-
tions or heed the warnings could result in injury or
death. Proper care is your responsibility.
CALLOUTS
(52) VALVE GP - CONTROL
138-1234
Callout Number
(Machine Location from
Component Locations Table)
Component
Name
Part Number

7. CHASSIS VIEW
CC
1
2 3
(Not Shown)
4
911
15 16 17
19
44 20
2122 23
25
26
32
3437
38
39
40
VIEW ALL CALLOUTS

8. FILTER GROUP
10
12
13 14
24
27
28
29
3031
35
36
42
AA
CL FCGIP
LAB
PB
PC
RAB
RCG
WAB
WCG
CC
SOS
VIEW ALL CALLOUTS

9. RIPPER ARRANGEMENT
5
6
7 818 33
41
43
M1
VIEW ALL CALLOUTS