INTERACTIVE SCHEMATIC
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Hydraulic System
330D and 336D Excavator
©
2008 Caterpillar, All Rights Reserved
Printed in U.S.A.
RENR9926-02
October 2008
330D:
R2D1-UP
MWP1-UP
336D:
J2F1-UP
W3K1-UP
COMPONENT LOCATION
Description
Part
Number
Machine
Location
Schematic
Location
Accumulator Gp - Hydraulic (Charged) 164-6981 1 B-5
Cylinder Gp - Boom Note A 2 F-3
Note A 3 F-8
Note A 4 F-8
Control Gp - Joystick (LH) 270-5951 5 C-8
270-5952 6 C-7
Filter And Valve Gp - Pilot (Hydraulic Oil) 158-8987 7 A-5
Filter Gp - Oil (Case Drain) 289-8194 8 A-5
188-4140 9 A-7
Manifold Gp - Control (Pilot Oil Supply) 215-5037 10 B-6
Motor Gp - Piston (Hydraulic Fan) 234-4638 11 A-8
Motor Gp - Swing 200-3373 12 F-6
Motor Gp - Travel (LH) 271-6376 13 F-5
271-6376 14 F-4
Pump Gp - Piston (Main with Pilot Gear Pump) 283-6116 15 B-3
Pump Gp - Piston (Hydraulic Fan) 259-0815 16 B-4
Sensor As - Pressure (Pump Control, LH) 260-2180 17 A-2
260-2180 18 B-2
Switch As - Pressure (Implement, Swing) 307-5769 19 B-8
307-5769 20 D-8
307-5769 21 D-7
Swivel Gp 234-4440 22 E-5
Tank Gp - Hydraulic 289-5565 23 A-6
Valve Gp - Check (Oil Cooler Bypass) 190-7745 24 B-8
Valve Gp - Load Control (Boom Drift Red, Line Relief) 255-5683 25 D-3
Stick Drift Red, Line Relief)
255-5680 26
D-6
Valve Gp - Main Control (Heavy Lift) 285-1540 27 C-4
Valve Gp - Pilot (Travel) 270-5947 28 E-8
Valve Gp - Pressure Reducing (Boom / Swing) 310-0210 29 B-5
Valve Gp - Shuttle ( 185-0462 30 B-8Implement, Swing)
Swing)
123-2430 31
B-5
Valve Gp - Solenoid (Heavy Lift) 121-6303 32 A-5
Valve Gp - Cushion Crossover Relief
158-9085 33
F-6
Valve Gp - Swing Cushion (Fine Swing) ATCH
158-9090
34
F-7
Valve Gp - Travel Counterbalance (LH) 204-2819 35 E-5
Note A: Refer to Service Manual for specific cylinder information.
204-2819 36
E-4
Cylinder Gp - Bucket
Cylinder Gp - Stick
Control Gp - Joystick (RH)
Filter Gp - Oil (Hydraulic Return)
Motor Gp - Travel (RH)
Sensor As - Pressure (Pump Control, RH)
Switch As - Pressure (Travel, LH)
Switch As - Pressure (Travel, RH)
Valve Gp - Load Control (
Valve Gp - Shuttle (
Valve Gp - Travel Counterbalance (RH)
TAP LOCATION
Tap
Number
Description
Schematic
Location
AA
Left Pump Delivery Pressure
A-2
BB
Right Pump Delivery Pressure
B-2
CC
Pump Power Shift Pressure
A-2
DD
Pilot Pump Delivery Pressure
A-5
SOS
Hydraulic Oil Sampling Port
A-4
FLUID POWER SYMBOLS
ONE POSITION
TWO POSITION
THREE POSITION
VENTED
PRESSURIZED
RETURN ABOVE FLUID LEVEL
RETURN BELOW FLUID LEVEL
LINES CROSSING LINES JOINING
TWO-WAY
THREE-WAY
FOUR-WAY
SPRING
CONTROL VALVES
RESTRICTION
LINE RESTRICTION
(FIXED)
2-SECTION PUMP
MAIN
AUX.
SPRING
(ADJUSTABLE)
VARIABILITY
LINE RESTRICTION
(VARIABLE)
LINE RESTRICTION
VARIABLE and PRESSURE
COMPENSATED
PRESSURE
COMPENSATION
PUMP: VARIABLE and
PRESSURE COMPENSATED
ENERGY TRIANGLES
HYDRAULIC PNEUMATIC
MEASUREMENT
PRESSURE
TEMPERATURE
FLOW
ROTATING SHAFTS
UNIDIRECTIONAL BIDIRECTIONAL
PUSH-PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING
MANUAL CONTROL SYMBOLS
HYDRAULIC MOTORS
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
HYDRAULIC PUMPS
FLUID STORAGE RESERVOIRS
CROSSING AND JOINING LINES
VALVE ENVELOPES
VALVE PORTS
BASIC COMPONENT SYMBOLS
FLUID CONDITIONER
PUMP or MOTOR
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
VALVES
PILOT CONTROL SYMBOLS
RELEASED PRESSURE
EXTERNAL RETURN
INTERNAL RETURN
REMOTE SUPPLY PRESSURE
SIMPLIFIED
COMPLETE
INTERNAL
SUPPLY PRESSURE
ACCUMULATORS
SPRING LOADED GAS CHARGED
SOLENOID
or MANUAL
SOLENOID
and PILOT
SOLENOID and
PILOT or MANUAL
COMBINATION CONTROLS
SOLENOID
SERVO
THERMAL
DETENT
HYDRAULIC AND PNEUMATIC CYLINDERS
DOUBLE ACTINGSINGLE ACTING
BASIC
SYMBOL
SPRING
LOADED
CHECK VALVES
TWO
POSITION
INFINITE
POSITIONING
FLOW IN ONE
DIRECTION
FLOW ALLOWED IN
EITHER DIRECTION
THREE
POSITION
CROSS
FLOW
PARALLEL
FLOW
INTERNAL PASSAGEWAYS
NORMAL POSITION
A B
P T
A B
P T
SHIFTED POSITION
INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOT
CONTROLLED
ELECTRICAL SYMBOLS
Hydraulic Symbols (Electrical)
325-AG135 PK-14
Circuit Identification
Number
Wire Color
Wire Gauge
Harness identification code
This example indicates
wire 135 in harness "AG".
325-PK-14
Wire Gauge
Wire Color
Circuit Number
Identification
Wire Number Identification Codes
Current Standard
Previous Standard
Electrical Schematic Example
Hydraulic Schematic Example
325-PK
Wire Color
Circuit Number
Identification
B
A
Wire
Wire
(EXAMPLE VALVE)
Current Standard
Transducer
(Fluid)
Transducer
(Gas / Air)
G
Generator
Electrical Wire
Pressure Switch
M
Electric Motor
Pressure Switch
(Adjustable)
Temperature Switch
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
Electrical Symbols (Electrical)
T
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Attachment
Air Line
CALLOUTS
Taps (Pressure, Sampling,Sensor) by letter
YY
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
RIGHT MAIN PUMP OUTPUT
PILOT PUMP OUTPUT
FAN PUMP AND CONTROL CIRCUIT
LEFT MAIN PUMP OUTPUT
TRAVEL SPEED CONTROL CIRCUIT
LEFT TRAVEL MOTOR CONTROL CIRCUIT
SUPPLY LINE
DRAIN / RETURN LINE
LEFT & RIGHT MAIN PUMP POWERSHIFT CIRCUIT
ATTACHMENT CONTROL CIRCUIT
HEAVY LIFT CONTROL CIRCUIT
RIGHT TRAVEL MOTOR CONTROL CIRCUIT
SWING MOTOR CONTROL CIRCUIT
BOOM CYLINDER CONTROL CIRCUIT
BUCKET CYLINDER CONTROL CIRCUIT
STICK CYLINDER CONTROL CIRCUIT
THIS SCHEMATIC IS FOR THE 330D and 336D EXCAVATOR
PART NUMBER: 259-7414, CHANGE: 01, VERSION: HE
Components are shown installed on a fully operable machine.
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
12345678
A
B
C
D
E
F
12345678
A
B
C
D
E
F
TRAVEL(L)
TRAVEL(R)
(28) VALVE GP
PILOT (TRAVEL)
270-5947
(20) SWITCH AS
PRESSURE
(TRAVEL, LH)
307-5769
(21) SWITCH AS
PRESSURE
(TRAVEL, RH)
307-5769
T1 T5
BACK
FWD
BACK
FWD
T2 T4 T6 T3
JLP
JLT
STICK
SWING
OUT
JL1
IN
JL3
R
L
JL2
JL4
BUCKET
BOOM
OPEN
CLOSE
DOWN
UP
JR1
JR2
JR3
JR4
A1 A2 A3 A4 A5 A6 A7 A8
B1 B2 B3 B4 B5 B6 B7 B8
TRAVEL MOTOR (LEFT)
TRAVEL MOTOR (RIGHT)
T1
Pp3
Pp3
T1
AB
A B
STICK
(4) CYLINDER GP
BUCKET
(3) CYLINDER GP
P2 Pi1
P1
DR1
DR2
DR3 DR4 DR5 DR6
P-IN PSA1PSA2
T-OUT1
T-OUT2
Pi2
Di2 Pi2 Pi3 Di3 DST bR2 Di1
T
AL4 aL4
SPi
SDr
SP3
Di4 Pi4 Pi1
BP3
BDr
BPi
BP2
R3aR5
AR2
BR2
aR2
BOOM
(2) CYLINDER GP
SWING MOTOR
P1 P2
T
A1 A2B1 B2
aL3
(12) MOTOR GP
SWING
200-3373
(33) VALVE GP
CUSHION
CROSSOVER
RELIEF
158-9085
(13) MOTOR GP
TRAVEL (LH)
271-6376
(14) MOTOR GP
TRAVEL (RH)
271-6376
(35) VALVE GP
TRAVEL COUNTERBALANCE (LH)
204-2819
(36) VALVE GP
TRAVEL COUNTERBALANCE (RH)
204-2819
(22) SWIVEL GP
234-4440
(26) VALVE GP
LOAD CONTROL
(STICK DRIFT RED,
LINE RELIEF)
255-5680
(27) VALVE GP
MAIN CONTROL (HEAVY LIFT)
285-1540
(24) VALVE GP
CHECK
(OIL COOLER BYPASS)
190-7745
(9) FILTER GP
OIL
(HYDRAULIC RETURN)
188-4140
(30) VALVE GP
SHUTTLE
(IMPLEMENT,
SWING)
185-0462
(10) MANIFOLD GP
CONTROL (PILOT OIL SUPPLY)
215-5037
(23) TANK GP
HYDRAULIC
289-5565
(29) VALVE GP
PRESSURE REDUCING
(BOOM / SWING)
310-0210
(32) VALVE GP
SOLENOID
(HEAVY LIFT)
121-6303
(7) FILTER AND VALVE GP
PILOT
(HYDRAULIC OIL)
158-8987
(8) FILTER GP
OIL (CASE DRAIN)
289-8194
JRP
JRT
(5) CONTROL GP
JOYSTICK (LH)
270-5951
(6) CONTROL GP
JOYSTICK (RH)
270-5952
(1) ACCUMULATOR GP
HYDRAULIC (CHARGED)
164-6981
bR5
IN
OUT
T
TT
TP
PG
PC
PAC
RETURN CHECK VALVE
Pi5
T2
T2
D E F
G
SP2
AG
AG
BG
BG
BR5 AR5
P
A
T
PG
DR
MU
BG
AG
(11) MOTOR GP
PISTON
(HYDRAULIC FAN)
234-4638
Pi1
Ps2
Pi2
D1
Ps1
S1
S
B
Dr1
Psv
a4
a1
a3
L
a2
(15) PUMP GP
PISTON
(MAIN WITH
PILOT GEAR PUMP)
283-6116
a5
L1
(16) PUMP GP
PISTON
(HYDRAULIC FAN)
259-0815
M1
M2
A4
D0
(31) VALVE GP
SHUTTLE (SWING)
123-2430
B A
aL1 bL1 bR1 aR1
AL3
BL3
AR4 BR4
AR3 BR3
AL2BL2
aR3 aR4 bR3 bR4 bL3 bL2 bL4 aL2
bL3
bL2 bL1
bR1
bR3 bR4
BL3 AL3
AL1AL2
BL1BL2
aL2
aR1
AR1
BR1 AR3BR3
BR4
AR4
aL1
aR3 aR4
NO.1
(TRAVEL)
NO.2
(SWING)
NO.3
(LOCK)
bL4
AR1BR1AL1BL1
R.C.V-C
R.C.V-B
R.C.V-A
R.C.V-A
R.C.V-B
R.C.V
R.C.V-C
PRPL
PL
PR
HR
HR
HL
HL
DRDR1 L2L3
A
B
STICK(2)
BOOM(1)
ATCH
BUCKET
TRAVEL(R)
TRAVEL(L)
SWING
STICK(1)
BOOM(2)
(UP)
(OUT)
(IN)
(R)
(L) (BACK)
(FWD)
(BACK)
(OPEN)
(CLOSE)
(UP)
(DOWN)
(OUT)
(IN)
BT
BP1
BR4
SP1
ST
BL3 R1R2
(25) VALVE GP
LOAD CONTROL
(BOOM DRIFT RED,
LINE RELIEF)
255-5683
BB
CC
AA
DD
SOS
(19) SWITCH AS
PRESSURE
(IMPLEMENT, SWING)
307-5769
(18) SENSOR AS
PRESSURE
(PUMP CONTROL, RH)
260-2180
(17) SENSOR AS
PRESSURE
(PUMP CONTROL, LH)
260-2180
B1
A1
(34) VALVE GP
SWING CUSHION
(FINE SWING) ATCH
158-9090
B
A
DR
A1B1

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