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INTERACTIVE SCHEMATIC
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Information
Component Table
Tap Table
Fluid Power Symbols
Electrical Symbols
Schematic
Machine Views
Front Frame
Rear Frame
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EC-C1
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RENR9980-07
July 2013
330D, 336D, and 336D2 Excavator and
336D MHPU
Hydraulic System
330D:
MAG1-UP
B6H1-UP
LRM1-UP
JLP1-UP
HAS1-UP
EDX1-UP
T2Y1-UP
336D:
PTB1-UP
J2F1-UP
KDJ1-UP
MYP1-UP
M4T1-UP
WET1-UP
336D2:
ZCT1-UP
336D MHPU:
JRX1-UP
Heavy Lift and Fine Swing
© 2013 Caterpillar, All Rights Reserved
Printed in U.S.A.
COMPONENT LOCATION
Description
Part
Number
Machine Schematic
Location Location
ACCUMULATOR GP
164-6981
1
B-6
CYLINDER GP - BOOM
NOTE A
2
G-3
CYLINDER GP - BUCKET
NOTE A
3
G-10
CYLINDER GP - STICK
NOTE A
4
G-10
FILTER GP - OIL (CASE DRAIN)
289-8194
5
A-6
FILTER GP - OIL (HYDRAULIC RETURN)
188-4140
6
A-9
FILTER GP - OIL (PILOT)
158-8987
7
A-5
MANIFOLD GP - CONTROL (PILOT OIL)
215-5037
8
B-8
MOTOR GP - HYDRAULIC FAN
234-4638
9
A-10
MOTOR GP - SWING
200-3373
10
G-8
MOTOR GP - TRAVEL (LEFT)
271-6376
11
G-6
MOTOR GP - TRAVEL (RIGHT)
271-6376
12
G-5
PUMP GP - HYDRAULIC FAN
259-0815
13
B-4
PUMP GP - MAIN
322-8733
14
B-3
SWIVEL GP
234-4440
15
F-6
VALVE GP - CHECK (OIL COOLER BYPASS)
190-7745
16
B-9
VALVE GP - CUSHION (CROSSOVER RELIEF)
322-8716
17
F-8
VALVE GP - LOAD CONTROL (BOOM DRIFT RED, RELIEF LINE)
255-5683
18
E-3
VALVE GP - LOAD CONTROL (STICK DRIFT RED, RELIEF LINE)
255-5680
19
E-7
VALVE GP - MAIN CONTROL
285-1345
20
D-4
VALVE GP - PILOT (TRAVEL)
310-0414
21
E-10
VALVE GP - PILOT CONTROL (LEFT JOYSTICK)
297-0533
22
D-10
VALVE GP - PILOT CONTROL (RIGHT JOYSTICK)
297-0532
23
D-9
VALVE GP - PRESSURE REDUCING (BOOM, SWING PRIORITY)
310-0210
24
B-6
VALVE GP - SHUTTLE
185-0462
25
C-10
VALVE GP - SHUTTLE
123-2430
26
B-6
VALVE GP - SOLENOID (HEAVY LIFT)
121-6303
27
B-6
VALVE GP - TRAVEL (COUNTERBALANCE) (LEFT)
204-2819
28
F-7
VALVE GP - TRAVEL (COUNTERBALANCE) (RIGHT)
204-2819
29
F-5
Note A: Refer to Parts Manual for your specific machine.
TAP LOCATION
Tap
Number
Description
Schematic
Location
AA
Pilot Filter Pressure Test Port
A-6
BB
Drive Pump Pressure Test Port
B-2
CC
Power Shift Pressure Test Port
B-2
DD
SOS
Idler Pump Pressure Test Port
Hydraulic Oil Sampling Port
A-2
A-5
FLUID POWER SYMBOLS
BASIC COMPONENT SYMBOLS
MAIN AUX.
PUMP or MOTOR
SPRING
(ADJUSTABLE)
VARIABILITY
CONTROL VALVES
SPRING
FLUID CONDITIONER
PRESSURE
COMPENSATION
LINE RESTRICTION
(VARIABLE)
TWO POSITION
2-SECTION PUMP
HYDRAULIC
PNEUMATIC
ENERGY TRIANGLES
ATTACHMENT
LINE RESTRICTION
VALVE PORTS
TWO-WAY
THREE POSITION
PUMP: VARIABLE and
PRESSURE COMPENSATED
VARIABLE and PRESSURE
COMPENSATED
VALVES
VALVE ENVELOPES
ONE POSITION
LINE RESTRICTION
(FIXED)
RESTRICTION
FOUR-WAY
THREE-WAY
CONTROL VALVES
CHECK VALVES
AB
AB
P T
NORMAL POSITION
P T
SHIFTED POSITION
INFINITE POSITION
SHUTTLE
SPRING
LOADED
BASIC
SYMBOL
PILOT
CONTROLLED
FLUID STORAGE RESERVOIRS
VENTED
RETURN ABOVE FLUID LEVEL
PRESSURIZED
RETURN BELOW FLUID LEVEL
MEASUREMENT
PRESSURE
TEMPERATURE
ROTATING SHAFTS
FLOW
UNIDIRECTIONAL
BIDIRECTIONAL
COMBINATION CONTROLS
SOLENOID
SOLENOID
or MANUAL
SOLENOID and
PILOT or MANUAL
SOLENOID
and PILOT
SERVO
DETENT
THERMAL
MANUAL CONTROL SYMBOLS
MANUAL SHUTOFF
PUSH-PULL LEVER
RELEASED PRESSURE
EXTERNAL RETURN
SPRING LOADED
HYDRAULIC PUMPS
VARIABLE DISPLACEMENT
NON-COMPENSATED
PEDAL
LINES CROSSING
LINES JOINING
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
UNIDIRECTIONAL
BIDIRECTIONAL
BIDIRECTIONAL
INTERNAL
SUPPLY PRESSURE
COMPLETE
HYDRAULIC AND PNEUMATIC CYLINDERS
SINGLE ACTING
DOUBLE ACTING
INTERNAL PASSAGEWAYS
HYDRAULIC MOTORS
FIXED
DISPLACEMENT
SPRING
REMOTE SUPPLY PRESSURE
SIMPLIFIED
CROSSING AND JOINING LINES
GAS CHARGED
PUSH BUTTON
PILOT CONTROL SYMBOLS
INTERNAL RETURN
ACCUMULATORS
FIXED
DISPLACEMENT
GENERAL MANUAL
INFINITE
POSITIONING
FLOW IN ONE
DIRECTION
THREE
POSITION
PARALLEL
FLOW
CROSS
FLOW
TWO
POSITION
FLOW ALLOWED IN
EITHER DIRECTION
ELECTRICAL SYMBOLS
Hydraulic Symbols (Electrical)
G
Transducer
(Fluid)
Transducer
(Gas / Air)
Pressure Switch
(Adjustable)
Pressure Switch
M
Generator
Electric Motor
Electrical Wire
Temperature Switch
Electrical Symbols (Electrical)
T
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
Wire Number Identification Codes
Electrical Schematic Example
Hydraulic Schematic Example
Current Standard
Current Standard
Harness identification code
This example indicates
wire 135 in harness "AG".
Wire
Circuit Number
Identification
Wire Color
325-AG135 PK-14
325-PK
Circuit Identification
Number
Wire Color
Wire Gauge
Previous Standard
Wire Color
Wire
325-PK-14
B
Circuit Number
Identification
A
Wire Gauge
(EXAMPLE VALVE)
10
9
8
(10) MOTOR GP
SWING
200-3373
7
6
5
PG
(11) MOTOR GP
TRAVEL (LEFT)
271-6376
DR
(3) CYLINDER GP
G
BUCKET
R.C.V.-C
(4) CYLINDER GP
STICK
G
(2) CYLINDER GP
BOOM
T1
T2
BL3
F
TT
BR4
F
B
A
BL2
AL2
A
(28) VALVE GP
TRAVEL (COUNTERBALANCE)
(LEFT)
204-2819
(17) VALVE GP
CUSHION
(CROSSOVER RELIEF)
322-8716
TP
AR4
AG
BG
BG
AG
TRAVEL (L)
1
Pp3
T1
T2
A1
B1
AL3
2
AG
Pp3
BR3
3
(12) MOTOR GP
TRAVEL (RIGHT)
271-6376
MU
BG
AR3
4
A
B
BL1
AL1
AR1
BR1
(15) SWIVEL GP
234-4440
TRAVEL (R)
B
(29) VALVE GP
TRAVEL
COUNTERBALANCE
(RIGHT)
204-2819
E
aL1
T6
BACK
T3
bR1
bL1
aR1
BL3
(21) VALVE GP
PILOT (TRAVEL)
310-0414
SP3
SPi
(19) VALVE GP
LOAD CONTROL
(STICK DRIFT RED,
RELIEF LINE)
255-5680 aL2
AL3
SP2
SDr
JLT
BACK
BP1 BT
R1
R3
IN
D
UP
JR1
Di2
A8
bL4
bR4
B7
bL3
bL2
C
R.C.V.: A
bL4
DE
F
FWD
Pi5
bL1
bL2
aL2
(8) MANIFOLD GP
CONTROL
(PILOT OIL)
215-5037
G
A
DST
P2
Pi1
P-IN
PSA2
DR1
PSA1
A1
B2
A2
T
P1
Pi2
DR5
T-OUT1
DR6
T
(27) VALVE GP
SOLENOID
(HEAVY LIFT)
121-6303
P
L2
(5) FILTER GP
OIL (CASE DRAIN)
289-8194
IN
OUT
A
(14) PUMP GP
MAIN
322-8733
Pi1
HR
(13) PUMP GP
HYDRAULIC FAN
259-0815
AA
PR
L1
D0
Ps1
a4
a1
M1
7
BB
Pressure Line
Pilot / Load Sensing Pressure
CC
a3
LEFT
PUMP
A4 S1
6
B
LINE PATTERNS
Psv
RIGHT
PUMP
S
a5
D1 Ps2
Drain / Return Lines
Component Group
M2
CALLOUTS
DD
a2
YY
Callout Number
(Machine Location from
Component LocationsTable)
Taps (Pressure, Sampling, Sensor - by letter)
(52) VALVE GP - CONTROL
138-1234
Part Number
Component
Name
A
PC
THIS SCHEMATIC IS FOR THE 330D, 336D, AND 336D2 EXCAVATOR AND 336D MHPU
HYDRAULIC SYSTEM / WITH HEAVY LIFT AND FINE SWING
MEDIA NUMBER: RENR9980-07
SCHEMATIC PART NUMBER: 259-7414, CHANGE: 02, VERSION: HE
HL
SOS
Pi2
8
PILOT PUMP OUTPUT
IMPLEMENT AND RIGHT TRAVEL PUMP OUTPUT
HEAVY LIFT CONTROL CIRCUIT
FAN PUMP OUTPUT
POWER SHIFT CONTROL CIRCUIT
SUPPLY LINE
STICK CONTROL AND STICK CYLINDER CIRCUIT
LEFT TRAVEL CONTROL AND LEFT TRAVEL MOTOR CIRCUIT
ATTACHMENT CONTROL CIRCUIT
SWING CONTROL AND SWING MOTOR CIRCUIT
DRAIN / RETURN LINE
IMPLEMENT AND RIGHT TRAVEL PUMP OUTPUT
TRAVEL SPEED CONTROL CIRCUIT
BUCKET CONTROL AND BUCKET CYLINDER CIRCUIT
RIGHT TRAVEL CONTROL AND RIGHT TRAVEL MOTOR CIRCUIT
BOOM CONTROL AND BOOM CYLINDER CIRCUIT
T
(6) FILTER GP
OIL (HYDRAULIC RETURN)
188-4140
9
(7) FILTER GP
OIL (PILOT)
158-8987
R.C.V.: RETURN CHECK VALVE
HR
PL
PG
B
bR4
P2
(1) ACCUMULATOR GP
164-6981 A
DR4
C
OUT
bR5
Di1
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
(24) VALVE GP
PRESSURE REDUCING
L
(BOOM, SWING
PRIORITY)
310-0210
B
DR
(9) MOTOR GP
HYDRAULIC FAN
234-4638
bR3
PR
(26) VALVE GP
SHUTTLE
123-2430
DR2
P1
DR3
L3
UP
bR2
PL
PAC
DR1
OPEN
B8
(16) VALVE GP
CHECK (OIL COOLER
BYPASS)
190-7745
R.C.V.: C
R.C.V.: B
B6
R
Di3
Dr1
bR3
B5
#3 (LOCK)
B4
Pi3
bL3
T-OUT2
aR4
B3
OUT
bR1
#2 (SWING)
B2
Pi2
STICK (2)
A7
DOWN
JR3
HL
10
BR4
BOOM (1)
A6
B
A
Pi1
DOWN
BUCKET
A5
CLOSE
JR2
ATCH
A4
OPEN
TRAVEL
(R)
B
A3
JR4
TRAVEL (L)
A2
L
JL4
SWING
A1
B1
aR3
R.C.V.: B
aR4
AR3
BR3
BACK
AR4
(20) VALVE GP
MAIN CONTROL
285-1345
aR2 BR2 AR2
Pi4
BP2
BOOM
STICK (1)
(25) VALVE GP
SHUTTLE
185-0462
R
JL2
BUCKET
BOOM (2)
IN
JL3
C
Di4
BR1
BPi
JRP
SWING
OUT
SP1 ST
BL3
R2
aR1
BL1
BR4
JRT
STICK
JL1
aL4
UP
aR3
AR1
L
(22) VALVE GP
PILOT CONTROL
(LEFT JOYSTICK)
297-0533 JLP
T
aL1
AL1
BL2
IN aL3
(23) VALVE GP
PILOT CONTROL
(RIGHT JOYSTICK)
297-0532
#1 (TRAVEL)
D
R.C.V.: A
AL4
AL2
BP3
(18) VALVE GP
LOAD CONTROL
(BOOM DRIFT RED,
RELIEF LINE)
255-5683
AR5
aR5
T5
FWD
T4
BR5
FWD
T2
CLOSE
BACK
T1
BDr
E
5
4
Components are shown installed on a fully operable machine with the key and engine off,
and with parking brake set.
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
3
2
1
MACHINE COMPONENT LOCATIONS
VIEW ALL CALLOUTS
25
8
22
23
21
4
3
26
2
16
1
24
27
14
13
17
FILTERS
VIEW ALL CALLOUTS
SOS
AA
6
7
MOTOR GP - SWING AND SWIVEL
VIEW ALL CALLOUTS
10
15
MOTOR GP - TRAVEL
VIEW ALL CALLOUTS
28
29
11
12
RIGHT SIDE SHOWN
PUMP GP - MAIN
VIEW ALL CALLOUTS
BB
CC
9
5
DD
VALVE GP - MAIN CONTROL
VIEW ALL CALLOUTS
20
18
19
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