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©
2009 Caterpillar, All Rights Reserved
Printed in U.S.A.
RENR9498-02
September 2009
System 5: One Pump / Two Way Flow
330D and 336D Excavator
Hydraulic System - Attachment
330D:
NBD1-UP
B6H1-UP
MWP1-UP
EDX1-UP
MEY1-UP
336D:
J2F1-UP
PRF1-UP
W3K1-UP
WRK1-UP
KKT1-UP
PGW1-UP
COMPONENT LOCATION
Description
Part
Number
Machine
Location
Schematic
Location
Valve Gp - Attachment Control 259-7378 1 D-3
Valve Gp - Line Relief (LH) 255-5661 2 C-3
Valve Gp - Line Relief (RH) 255-5661 3 C-2
Valve Gp - Solenoid (Work Tool) 259-7430 4 E-6
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
A
B
C
D
E
F
1234567
A
B
C
D
E
F
1234567
TRAVEL(L)
TRAVEL(R)
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
JRP
JRT
Di2
STICK(2)
BOOM(1)
ATCH
BUCKET
TRAVEL(R)
TRAVEL(L)
SWING
STICK(1)
BOOM(2)
Pi2
Pi3
Di3
DST
Di1
HR
T
AL4
aL4
SPi
SDr
SP3
Di4
Pi4
Pi1
BP3
BDr
BPi
BP2
R3
aR5
AR5
BR5
AR2
BR2
(UP)
(OUT)
(IN)
(R)
(L)
(FWD)
(REV)
(FWD)
(REV)
(OPEN)
(CLOSE)
(UP)
(DOWN)
(OUT)
aL3
PG
DR
MU
A
B
SWING MOTOR
A
B
C
D
E
F
G
P1
P2
B1
B2
A1
A2
T
P2
Pi1
P1
DR1
DR2
DR3
DR4
DR5
DR6
P-IN
PSA1
PSA2
T-OUT1
T-OUT2
Pi2
IN
OUT
T
PST
bR5
P
A
T
Pi5
TT
TP
PG
PC
T1
X
X
B
A4
Pi2
Pi1
Dr1
Di
D0
PS1
PS2
A1
a1
a4
a3
a2
a5
A2
B
L
L1
S
PSV
U
FR
RR
HL
A1
B1
DR
A1
A2 A3 A4 A5 A6 A7 A8
B1 B2
B3
B4
B5
B6
B7
B8
STICK
CYLINDER
BOOM
CYLINDER
BUCKET
CYLINDER
BOOM
CYLINDER
TRAVEL MOTOR (LEFT) TRAVEL MOTOR (RIGHT)
T1
A
B
A
B
aL1 bL1 bR1 aR1
µ
µ µ
µµ
µ µ
µ
BL2 AL2
NO.1
(TRAVEL)
NO.2
(SWING)
NO.3
(LOCK)
AR3
AR4aR4
BR3
aR3
aR2
aR1
BR1
AR1aL1AL1
BL1
aL2
BL1
AL1
BL3
AL3
bL4 bL3 bL2
bL1 bR4bR3
BR4
bR1
µ
µ µ
µ
DR
DR1
L2
L3
A
B
PRPL
PR
PL
HIGH PRESS. LINE
aR2 bR2
T
P
A1
B1
A2
B2
bR2
aR3 aR3 bR3 bR4 bL3 bL4 aL2bL2
AL3 BL3
AR3 BR3 AR4 BR4
BL1 AL1 BR1 AR1
(4) VALVE GP
SOLENOID
(WORK TOOL)
259-7430
(3) VALVE GP
LINE RELIEF (RH)
259-7430
(1) VALVE GP
ATTACHMENT
CONTROL
259-7378
(2) VALVE GP
LINE
RELIEF (LH)
259-7430
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.
ATTACHMENT: ONE PUMP / TWO WAY FLOW
SCHEMATIC PART NUMBER: 255-5858, CHANGE: 01, VERSION: HE
MEDIA NUMBER: RENR9498-02
THIS SCHEMATIC IS FOR THE 330D AND 336D EXCAVATOR HYDRAULIC SYSTEM
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
CALLOUTS
Taps (Pressure, Sampling, Sensor - by letter)
YY
(52) VALVE GP - CONTROL
138-1234
Callout Number
(Machine Location from
Component LocationsTable)
Component
Name
Part Number
MACHINE COMPONENT LOCATIONS
4
3
2
1
VIEW ALL CALLOUTS
