INTERACTIVE SCHEMATIC
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Hydraulic System - Attachment
330D and 336D Excavator
©
2009 Caterpillar, All Rights Reserved
Printed in U.S.A.
RENR9885-03
September 2009
330D:
NBD1-UP
B6H1-UP
L2K1-UP
JLP1-UP
MWP1-UP
EDX1-UP
MEY1-UP
336D:
J2F1-UP
PRF1-UP
W3K1-UP
WRK1-UP
KKT1-UP
PGW1-UP
Boom Lowering Control Valve
COMPONENT LOCATION
Description
Part
Number
Machine
Location
Schematic
Location
A-5
)LIOTOLIP(CILUARDYH-
ROTALUMUCCA
E-2
MOOB-PGREDNILYC
E-7
TEKCUB-PGREDNILYC
CYLINDER GP - STICK
6
-A)NRUTERCILUARDYH(LIO-PGRETLIF
4
-A)TOLIP(LIO-PGRETLIF
FILTER GP - OIL (CASE DRAIN)
A-5
)LIOTOLIP(LORTNOC-PGDLOFINAM
A-7
NOTSIP-PGROTOM
PUMP GP - PISTON (HYDRAULIC FAN)
A-3
A-5
E-6GNIWS-PGROTOM
E-4
LEVART-PGROTOM
2
-B)NIAM(NOTSIP-PGPMUP
D-4
SWIVEL GP
E-4
VALVE GP - PILOT (TRA )LEV
VALVE GP - SHUTTLE
VALVE GP - CHECK (OIL COOLER A-7)SSAPYB
VALVE GP - LOAD CONTROL
(STICK DRIFT RED, RELIEF LINE)
C-5
VALVE GP - LOAD CONTROL
(BOOM LOWERING, DRIFT REDUCTION, RELIEF)
E-2
B-7
VALVE GP - SWING CUSHION (FINE SWING)
VALVE GP - TRAVEL COUNTERBALANCE
E-6
VALVE GP - LOAD CONTROL
(BOOM LOWER, MANUAL)
270-5692 E-2
C-28840-581KCOLB
A-4
)TFILYVAEH(DIONELOS-PGEVLAV
2
-CLORTNOCNIAM-PGEVLAV
4
5
6
7
8
9
10
11
12
15
13
14
16
17
18
3
19
21
22
23
24
25
26
28
2
1
27
20
29
C-7)KCITSYOJTFEL(LORTNOCTOLIP-PGEVLAV
)KCITSYOJTHGIR(LORTNOCTOLIP-PGEVLAV
VALVE GP - PRESSURE REDUCING (BOOM,
SWING PRIORITY)
B-4
NOTE A
164-6981
NOTE A
NOTE A
188-4140
126-2075
158-8987
215-5037
200-3373
234-4638
271-6376
259-0815
234-4440
283-6116
190-7745
263-1962
270-5951
255-5680
285-1536
232-4102
185-0462
121-6303
270-5952
270-5947
158-9090
204-2819
Note A: Refer to Parts Manual for your specific machine.
Attachment
Standard 330D
E-7
C-6
D-7
VALVE GP - SHUTTLE
259-7732
B-4
GP
TAP LOCATION
Tap
Number
Description
Schematic
Location
4-AtroPtseTerusserPretliFtoliPAA
2-AtroPtseTerusserPpmuPevirDBB
2-AtroPtseTerusserPtfihSrewoPCC
4-AtroPgnilpmaSliOciluardyHSOS
2-AtroPtseTerusserPpmuPreldIDD
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
PILOT PUMP OUTPUT
IMPLEMENT AND LEFT TRAVEL PUMP OUTPUT
HEAVY LIFT CONTROL CIRCUIT
FAN PUMP OUTPUT
POWER SHIFT CONTROL CIRCUIT
SUPPLY LINE
SHUTTLE VALVE CONTROL CIRCUIT
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
SWING BRAKE CONTROL CIRCUIT
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
THIS SCHEMATIC IS FOR THE 330D AND 336D EXCAVATOR
ATTACHMENT: BOOM LOWERING CONTROL VALVE
MEDIA NUMBER: RENR9885-03
PART NUMBER: 255-5867, CHANGE: 02, VERSION: HE
Components are shown installed on a fully operable machine.
Refer to the appropriate Service Manual for Troubleshooting, Specifications.
A
B
C
D
E
1234567
A
B
C
D
E
1234567
T
Pi
AL3 BL3
AR3 BR3
AR4
(7) CYLINDER GP
STICK
(16) PUMP GP
PISTON (MAIN)
283-6116
R.C.V.: RETURN
CHECK VALVE
(6) CYLINDER GP
BUCKET
(5) CYLINDER GP
BOOM
(26) VALVE GP
SHUTTLE
259-7732
(10) FILTER GP
OIL (PILOT)
158-8987
(27) VALVE GP
SOLENOID
(HEAVY LIFT)
121-6303
(24) VALVE GP
PRESSURE REDUCING
(BOOM, SWING
PRIORITY)
232-4102
(4) ACC. GP
HYDRAULIC
(PILOT OIL)
164-6981
(8) FILTER GP
OIL (CASE DRAIN)
126-2075
(11) MANIFOLD GP
CONTROL (PILOT OIL)
215-5037
(9) FILTER GP
OIL
(HYDRAULIC
RETURN)
188-4140
(12) MOTOR GP
PISTON
234-4638
(18) VALVE GP
CHECK (OIL
COOLER BYPASS)
190-7745
(19) VALVE GP
LOAD CONTROL
(STICK DRIFT RED,
RELIEF LINE)
255-5680
(1) BLOCK
185-0488
(20) VALVE GP
MAIN CONTROL
285-1536
(29) VALVE GP
TRAVEL
COUNTERBALANCE
204-2819
(13) MOTOR GP
SWING
200-3373
(28) VALVE GP
SWING CUSHION
(FINE SWING)
158-9090
bR1 aR1
aL1 bL1
TRAVEL(L)
TRAVEL(R)
(23) VALVE GP
PILOT (TRAVEL)
270-5947
T1
T5
BACK
FWD
BACK
FWD
TTTP
T2
T4
T6
T3
HCTIWSERUSSERPHCTIWSERUSSERP
aR3 aR4 bR3 bR4 bL3 bL2 bL4 aL2
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
(25) VALVE GP
SHUTTLE
185-0462
JRT
(21) VALVE GP
PILOT CONTROL
(LEFT JOYSTICK)
270-5951
(22) VALVE GP
PILOT CONTROL
(RIGHT JOYSTICK)
270-5952
JRP
PRESSURE SWITCH
R.C.V-A
R.C.V-B
R.C.V-C
A
C
B
D
DR1 DR
B
A
L3 L2
E
F
G
SLOW RETURN BYPASS
OIL COOLER
RETURN
IN
OUT
T
T P
DRAIN
TRAVEL BRAKE
ABA B
AG
Pp3Pp3
T1
T2
T1
T2
BGBG
AG
CV
TRAVEL MOTOR (LEFT) TRAVEL MOTOR (RIGHT)
(14) MOTOR GP
TRAVEL
271-6376
(17) SWIVEL GP
234-4440
BL1 AL1
BR1
AR1
TRAVEL BRAKE
AL2
BL2
PG
DR
MU
BG
AG
B
A
SWING MOTOR
DR
A1
B1
R.C.V-C
1RD1iP2P
DR2
6RD5RD4RD3RD
1ASPNI-P PSA2
T-OUT1
T-OUT2
Pi2
NO.1
(TRAVEL)
NO.2
(SWING)
NO.3
(LOCK)
P1
TRAVEL SPEED SWING
PRIORITY
PAC
bL3
bL4
bL2
aL2
RH4Rb
aR4
bR3
aR3
aL1
bL1
aR1
bR1
R.C.V-B
R.C.V-A
AL2
BL2
BL1
AL1
AR1
BR1
AR4
BR3
AR3
AL3BL3
PR
PR
PL
PL
HL
HL
HR
PRESSURE
SENSOR
D
I
LEFT
PUMP
RIGHT
PUMP
PRESSURE
SENSOR
STICK DRIFT REDUCTION
PROPORTIONAL
REDUCING
VALVE
MAIN
RELIEF
A
P1 P2
Di2
BOOM(2)
Di3Pi2 Pi3
A1 B2 A2
T
S
B
L
L1
A4 S1
Dr1
D1 Ps2
D0 Ps1
Pi1
a4
a1
M1
Psv
a3
M2
a5
a2
Pi2
5Rb1iD2Rb5iPTSD
BP3
BP2
BR5 AR5
aR5 R3
(IN)
Pi1
(DOWN)(CLOSE)
AR2
BR2
aR2
(BACK)(BACK)
Di4 Pi4
(L)(IN)
aL3SP1 ST
BL3 R2
T AL4 aL4
(UP)
SP3
SDr
SPi SP2
STICK(1)
SWING
TRAVEL(L)
TRAVEL(R)
ATCH
BUCKET
(OPEN)
(FWD)
(R)
(OUT)
BOOM(1)
STICK(2)
(OUT)
(UP)
(15) PUMP GP
PISTON
(HYDRAULIC FAN)
259-0815
PG
AA
PILOT
FILTER
PRESSURE
SOS
HYDRAULIC
OIL
SAMPLING
DRIVE PUMP
PRESSURE
TEST PORT
POWER SHIFT
PRESSURE
TEST PORT
IDLER PUMP
PRESSURE
TEST PORT
DD
BB
CC
Dr
CYL
X
X
CYL
T
PiCV
Dr
(3) VALVE GP
LOAD CONTROL
(BOOM LOWERING,
DRIFT REDUCTION, RELIEF)
263-1962
(2) VALVE GP
LOAD CONTROL
(BOOM LOWER,
MANUAL)
270-5692
H
Y
D
R
A
U
L
I
C
A
C
T
I
V
A
T
I
O
N
P
I
L
O
T
PC
MACHINE COMPONENT LOCATIONS
27
26
25
24
23
22
21
18
16
15
11
7
6
5
4
4
3
2
VIEW ALL CALLOUTS
MOTOR GP - PISTON (TRAVEL)
29
14
VIEW ALL CALLOUTS
MOTOR GP - SWING AND SWIVEL
28
17
13
VIEW ALL CALLOUTS
PILOT OIL FILTER GP
10
9
8
VIEW ALL CALLOUTS
PUMP GP - PISTON (MAIN)
Pump Compartment
(A) Delivery line (Drive Pump)
(B) Delivery line (IdlerPump)
(C) Drive Pump
(D) Idler Pump
D
C
A
B
SOS
CC
DD
BB
AA
12
VIEW ALL CALLOUTS
VALVE GP - MAIN CONTROL
20
191
VIEW ALL CALLOUTS
