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7/25/2019 Material Interactive Schematic Hydraulic System Caterpillar d6k2 Track Type Tractor
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Click here to view the
Schematic Symbolsand Definitions page
INTERACTIVE SCHEMATIC
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Cover Page
Tables
Schematic
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Chassis View
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Features
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Bookmarks X
EC-C3
EC-C2 E-C60
EC-C1
E-C61
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FUNCTION
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Hand Tool
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KEYS
CTRL / -
CTRL / 0 (zero)
SPACEBAR (hold down)
Find CTRL / F
Pressure
SwitchTemperature
SwitchLevel
SwitchFlow
Switch Circuit Breaker
T
ELECTRICAL SYMBOLS
Spring
(Adjustable)
Variability
Fluid
Conditioner
Pump
or Motor
BASIC HYDRAULIC
COMPONENT SYMBOLS
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SCHEMATIC SYMBOLS AND DEFINITIONS
HYDRAULIC SYMBOLS - ELECTRICAL
Transducer(Fluid)
Transducer(Gas / Air)
G
Generator ElectricalWire
PressureSwitch
M
ElectricMotor
Pressure Switch(Adjustable)
TemperatureSwitch
PressureSwitch
TemperatureSwitch
LevelSwitch
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 Compensate
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 Le
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
SymbolSpring
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
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 indicatesthat 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.
BASIC ELECTRICAL COMPONENT SYMBOLS
Push-pull Lever PedalGeneral Manual Push Button SpringManual Shutoff
MANUAL CONTROL
External Return Internal Return
Simplified CompleteInternal
Supply Pressure
RELEASED PRESSURE
REMOTE SUPPLY PRESSURE
PILOT CONTROL
Spring Loaded Gas Charged
ACCUMULATORS
Crossing Joining
LINES
Double ActingSingle Acting
CYLINDERSUnidirectional
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
Pin or Socket Nu
Part Number:for
Connector Plug
Harness Identification Letter(s): (A, B, C, AA, AB, AC, ...)
Plug Receptacle
Wire, Cable, or Harness Assembly Identification:
Includes Harness Identification Letters and Harness
Connector Serialization Codes (see sample).
Harness Connector Serialization Code:The "C" stands fo
"Connector" and the number indicates which connector in t
harness (C1, C2, C3, ...)
HARNESS AND WIRE SYMBOLS
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UENR0069-01July 2012
D6K2 Track-Type TractorHydraulic System
WMR1-UP
RST1-UP
Printed in U.S.A. 2012 Caterpillar, All Rights Reserved
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COMPONENT LOCATION
Description Part
Number
Machine
Location
Schematic
Location
ACCUMULATOR GP - DEAD ENGINE LOWER 160-2669 1 E-8
CYL GP - ANGLE 379-3504 2 C-9
CYL GP - LIFT 379-3505 3 D-9
CYL GP - RIPPER 325-5723 4 D-9
CYL GP - TILT 379-3503 5 C-9
FILTER - SCREEN 227-1197 6 B-8
KIT - SHUTTLE 227-1192 7 E-8
MANIFOLD GP - INLET 266-2580 8 B-9
MANIFOLD GP - OUTLET 266-2579 9 E-9
PLUG AS - RELIEF VALVE 227-1191 10 C-9
PUMP GP - IMPLEMENT 246-9876 11 C-6
VALVE GP - 3 BANK (LIFT, TILT, ANGLE) 309-1571 12 E-8
VALVE GP - 4 BANK (LIFT, TILT, ANGLE, RIPPER) 309-1572 13 E-8VALVE GP - CHECK (BACK PRESSURE) 355-5736 14 B-5
VALVE GP - DOZER ANGLE 320-3631 15 D-9
VALVE GP - DOZER LIFT 320-3629 16 C-9
VALVE GP - DOZER LIFT HEAD END MAKE-UP 257-7732 17 C-9
VALVE GP - DOZER TILT 320-3630 18 D-9
VALVE GP - FLOW CONTROL 227-1185 19 B-8
VALVE GP - LINE RELIEF SND MAKE-UP 257-7726 20 C-9
VALVE GP - LINE RELIEF SND MAKE-UP 348-9774 21 D-8
VALVE GP - MANUAL (DEAD ENGINE LOWER) 257-7736 22 E-9
VALVE GP - RELIEF 227-1184 23 B-8
VALVE GP - RIPPER LIFT 320-3632 24 D-9
VALVE GP - SOL (EH ON-FF PILOT SUPPLY SHUT OFF) 221-4486 25 E-8
D-8
D-8
C-8
C-8
CORE AS - OIL COOLER 376-6421 27 E-2
D-3
D-4
C-6
MOTOR GP - LEFT DRIVE 243-6639 29 E-6
MOTOR GP - RIGHT DRIVE 243-6640 30 A-6
PUMP GP - HYSTAT 243-6637 31 C-3
SENSOR GP - HYSTAT SHAFT SPEED 358-2398 32A-6
E-6
D-3
D-2
C-2
C-3
D-5
VALVE - CHECK 9T-1013 34 D-3
VALVE GP - RETURN MANIFOLD 378-6420 35 E-3
MOTOR GP - FAN 353-0255 36 B-1
MANIFOLD - MOTOR BYPASS 252-7008 37 B-2
MANIFOLD GP - REVERSING 285-7460 38 A-2
B-2
B-1
COMPONENT LOCATIONS
IMPLEMENT
HYSTAT
FAN
SENSOR GP - PRESSURE 349-1178 33
28357-4877
39177-3868VALVE - CHECK (ANTI-CAVITATION)
26302-8149VALVE GP - SOL (EH PROPORTIONAL ACTUATORS)
FILTER GP - OIL
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TAP LOCATION
Tap Number Description SchematicLocation
R1 IMPLEMENT PUMP SIGNAL PRESSURE 'LS' PORT
R2 IMPLEMENT PUMP OUTLET PRESSURE
R3 IMPLEMENT PUMP FILLING PORT
P4 FILTER SOS
P5 LEFT CHARGE LOOP
P6 RIGHT CHARGE LOOP
P7 WINCH CHARGE LOOP
P8 PARK BRAKE PRESSURE PORT
P9 FRONT PUMP CASE PRESSURE PORT
P10 FAN PUMP OUTLET PRESSURE
Remote Ports
Local Ports
TAP LOCATIONS
Pressure, Sampling, Sensor
D-6
B-9
D-6
D-3
D-5
C-5
C-6
D-1
C-2
D-6
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Components areshowninstalledona fully operablemachinewiththekey andengineoff, transmissionshinneutralandwithparkingbrakeset.
RefertotheappropriateServiceManualforTroubleshooting, Specifications andSystems Operations.
SCHEMATICPART NUMBER: 346-5187, CHANGE: 00, VERSION: -
THIS SCHEMATICIS FOR THE D6K2TRACK-TYPE TRACTORHYDRAUL
MEDIANUMBER: UENR0069-01
LINE PATTERNS
Drain/ ReturnLines
Component Group
Pilot / LoadSensingPressure
PressureLine
CALLOUTS
Taps (Pressure, Sampling, Sensor-by letter)YY
(52)VALVE GP-CONTROL138-1234
Callout Number(MachineLocationfrom
Component LocationsTable)
ComponentName
Part Number
NOTES:
A:(26) VALVE GP-SOL(EHPROPORTIONALACTUATORS)
B:(21) VALVE GP-LINE RELIEF SNDMAKE-UP
HYDRAULICCIRCUIT COLORDESCRIPTIONS
PILOT PUMP CIRCUIT
IMPLEMENT PUMP CIRCUIT
WINCHCIRCUIT
DRIVE PUMP CIRCUIT
STEERING MOTORCIRCUIT
SUPPLY LINE
BRAKE CIRCUIT
TILT CYLINDERCIRCUIT
LIFT CYLINDERCIRCUIT
DRAIN/ RETURNLINE
WINCHPUMP CIRCUIT
ANGLE CYLINDERCIRCUIT
RIPPERCYLINDERCIRCUIT
WINCHBRAKE CIRCUIT
RIGHT MOTOR
LEFT MOTOR
TO CLR
FROMCLR
P
PC1
MU
MC1
PB
PC2
T
MU
MC2
PS
A B
AB
HYSTATCUTOFF
BRAKERELEASE
X2 X1X2 X1
FE FA
Y
MB FA
Y
MB
B
T
ABA TS
G
COR
COR
CHRG
G
COR
COR
CHRG
ACTR ACTR
MAMA
R
G
+
T
U
G
+
T
U
ENGINE
CW
MIN
MAX
DA
BRAKEF/S
GT
U X T M1
B
A
BFS
BRAKEFREESPOOL
REELOUT
REELIN
CONTROLPRESS.
DRIVEAWAY
T P1
P
DRIVE AWAYFLOWTHROTTLING VALVE B
A
FE FA A
S T R G B MH PS
CHRG
COR
COR
POR
ACTR
X1X2
Y
LIFT
ANGLE
RIPPER
TILT
RAISEHOLDLOWERFLOATRAISE
LOWER
LEFT
RIGHT
RAISE
LOWER
LEFT
RIGHT
P LST
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:
SOFTWARE:
ELECTRONICCONTROLMODULE
CONTROLLEVEROPT:IMPLJOYSTICK:HYSTATJOYSTICK:
S
L1
B2 B X L
P9
R1
P5
P8
R2
REV MANIFOLD - OPTION
WINCH - OPTION
T
D
R IG H T H O LD L EF T
R I GH T H O LD L E FT
R IG H T H O LD L EF T
P6P4
P7
26
P10
(11)PUMP GP - IMPLEMENT
(28)FILTERGP -OIL
(28)FILTERGP -OIL
(33)SENSORGP -PRESSURE
(33)SENSORGP -PRESSURE
(33)SENSORGP -PRESSURE
(33)SENSORGP -PRESSURE
(28)FILTERGP -OIL
(46)PUMP GP -WINCH
(33)SENSORGP -PRESSURE
(31)PUMP GP -HYSTAT
(34)VALVE GP -CHECK
(35)VALVE GP -RETURNMANIFOLD(27)CORE AS -COOLER
(32)SENSORGP -HYSTAT SHAFT SPEED
(32)SENSORGP -HYSTAT SHAFT SPEED
(30)MOTORGP -RIGHT DRIVE
(29)MOTORGP -LEFT DRIVE
(37)MANIFOLDGP -MOTORBYPASS
(43)VALVE GP - SOL(EHPROPORTIONAL)
(38)MANIFOLDGP -REVERSING
(43)VALVE GP -SOL (EHPROPORTIONAL)
(39)VALVE GP -CHECK
(39)VALVE GP -CHECK
(42)VALVE GP -SOL
(41)VALVE GP -REVERSING
(40)VALCROSS O
(36)MOTORG
(14)VALVE GP -CHECK(44)BREATHERAS. -183-3873
(47)SCREEN-SUCTION
(48)TANK GP -HYDRAULICOIL
(45)MOTORANDVALVE AS -WINCH
(19)VALVE GPFLOW CONT.
227-1185
(23)VALVE GP -RELIEF
227-1184
(6)FILTER-SCREEN227-1197
(26)SEE NOTE A
26
26
(26)SEE NOTE A
26
26
(26)SEE NOTE A
26
26
(26)SEE NOTE A
26
(10)PLUG AS -RELIEF VALVE
(17)VALVE GP -DOZERLIFTHEADENDMAKE-UP
(20)VALVE GP -LINE RELIEFSNDMAKE-UP
(16)VALVE GP -DOZERLIFT320-3629
(8)MANIFOLDGP -INLET266-2580
(3)CYLGP -LIFT
(5)CYLGP -TILT
(2)CYLGP -ANGLE
(4)CYLGP -RIPPER
(15)VALVE GP -DOZERANGLE
(18)VALVE GP -DOZERTILT
21
21
21
(21)SEE NOTE B
(21)SEE NOTE B
(21)SEE NOTE B
348-9774
(24)VALVE GP -RIPPERLIFT
(22)VALVE GP -MANUAL(DEADENGINE LOWER)
(9)MANIFOLDGP -OUTLET
(12)VALVE GP -3BANK
(13)VALVE GP -4BANK
(7)KIT -SHUTTLE
(25)VALVE GP -SOL(EHPILOT SUPPLY SHUT OFF)
(1)ACCUMULATORGP - DEADENGINE LOWER
(22)VALVE GP -MANUAL(DEADENGINE LOWER)
257-7736
309-1571
309-1572
266-2579
257-7736
379-3504
320-3631
320-3630
320-3632
358-2398
221-4486
160-2669
227-1191
257-7732
257-7726
379-3505
379-3503
297-1422
358-2398
243-6640
355-5736
322-9703
358-6527
246-9876
357-4877
357-4877
349-1178
349-1178
349-1178
249-8600
349-1178
243-6637
9T-1013
349-1178
252-7008
285-7460
211-2092
177-3868
241-5895
252-7010
208-0886
3
378-6420376-6421
357-4877
243-6639
325-5723
211-2092
177-3868
R3
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CHASSIS VIEW
P10
P9
38
37
36
33
32
31
30
29
11
53
2
VIEW ALL C
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SUPPLEMENTAL CHASSIS VIEW
48 47
44
27
14
VIEW ALL CALLO
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REAR LEFT FENDER COMPARTMENT VIEW
R3R2R1
VIEW ALL CALLO
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IMPLEMENT VALVE VIEW
24
22 18
16
15
9
8
VIEW ALL CALLO
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WINCH PUMP VIEW
P8
46
35
13
12
1
VIEW ALL CALLO
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WINCH VIEW
P7
45
VIEW ALL CALLO
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RIPPER VIEW
4
VIEW ALL CALLO
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