INTERACTIVE SCHEMATIC
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Hydraulic System - Attachment
330D and 336D Excavator
©
2009 Caterpillar, All Rights Reserved
Printed in U.S.A.
RENR9499-02
September 2009
330D:
NBD1-UP
B6H1-UP
JLP1-UP
MWP1-UP
EDX1-UP
MEY1-UP
336D:
J2F1-UP
PRF1-UP
W3K1-UP
WRK1-UP
KKT1-UP
PGW1-UP
System 14: Combined Function
COMPONENT LOCATION
Description
Part
Number
Machine
Location
Schematic
Location
Block 168-9759 1
D-2
Sensor As - 1-Way/2-Way Flow Pessure 221-8859 2 E-4
Valve Gp - 1-Way/2-Way Check Sol (EC1) 215-4890 3 D-4
Valve Gp - 1-Way/2-Way Check Sol (EC2) 215-4890 4 E-5
Valve Gp - 1-Way/2-Way Check Sol (EC3) 215-4890 5 E-4
Valve Gp - 4 Function Work Tool Solenoids 259-7429 6 E-2
Valve Gp - Auxilliary Control 259-7378 7 C-6
Valve Gp - Negative Flow Control Solenoid 171-0188 8 D-2
Valve Gp - Solenoid And Relief (ERV1) 244-8506 9 D-5
Valve Gp - Solenoid And Relief (ERV3) 244-8506 10 E-5
Accumulator Gp 164-6981 11 A-5
Block Note B 12 B-7
Cylinder Gp - Bucket Note A 13
E-5
Cylinder Gp - Boom Note A 14 E-6
Cylinder Gp - Stick Note A 15 E-5
Filter Gp - Oil (Case Drain) 126-2075 16 A-5
Filter Gp - Oil (Pilot) 158-8987 17 A-4
Filter Gp - Oil (Hydraulic Return) 188-4140 18 B-6
Manifold Gp - Control (Pilot Oil) 215-5037 19 A-5
Motor Gp - Fan 242-6776 20 B-6
Motor Gp - Left Travel 271-6376 21 E-4
Motor Gp - Right Travel 271-6376 22 E-3
Motor Gp - Swing 200-3373 23 E-7
Pump Gp - Pison (Hydraulic Fan) 259-0815 24 B-3
Pump Gp - Piston (Main) 283-6116 25 A-3
Sensor As - Left Pump Pressure 221-8859 26 A-2
Sensor As - Right Pump Pressure 221-8859 27 B-2
Switch As - LH Travel Pressure 167-3466 28 C-7
Switch As - Pilot Pressure 167-3466 29 A-7
Switch As - RH Travel Pressure 167-3466 30 C-6
Swivel Gp 234-4440 31 D-3
Valve Gp - Check (Oil Cooler Bypass) 190-7745 32 C-6
Valve Gp - Heavy Lift Solenoid 121-6303 33 A-4
Valve Gp - Left Travel Counterbalance 204-2819 34 E-4
Valve Gp - Pilot Control (LH Joystick) 270-5951 35 A-7
Valve Gp - Load Control (Boom) 255-5683 36 C-2
Valve Gp - Load Control (Stick) 255-5680 37 C-5
Valve Gp - Main Control 285-1536 38 C-3
Valve Gp - Pilot Travel 270-5947 39 C-6
Valve Gp - Press Reducing Boom/Swing Priority 232-4102 40 B-4
Valve Gp - Pilot Control (RH Joystick) 270-5952 41 A-6
Valve Gp - Right Travel Counterbalance 204-2819 42 E-3
Valve Gp - Shuttle 185-0462 43 A-7
Valve Gp - Swing Cushion (Fine Swing) 322-8716 44 E-7
System 14 Attachment
Standard 330D
Note A:Refer to parts manual for specific cylinder information.
Note B:Part numbers are located on the main Hydraulic System Schematic according to
the effectivity of the machine.
TAP LOCATION
Tap
Number
Description
Schematic
Location
AA
Pilot Pump Delivery Pressure A-4
BB
Right Pump Delivery Pressure A-2
CC
Pump Power Shift Pressure A-2
DD
Left Pump Delivery Pressure A-2
EE
Auxilliary Control Pilot Pressure (Pb1) E-2
FF
Auxilliary Control Pilot Pressure (Pa1) E-2
GG
Single/Double Attach Pressure (bR2) E-2
HH
Single/Double Attach Pressure (aR2) E-2
LL
Left Pump Negative Flow Signal Pressure D-1
MM
Right Pump Negative Flow Signal Pressure D-1
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
PILOT PUMP OUTPUT
RIGHT MAIN PUMP OUTPUT
HEAVY LIFT CONTROL CIRCUIT
FAN PUMP OUTPUT
LEFT & RIGHT MAIN PUMP POWER SHIFT CIRCUIT
NEGATIVE FLOW CONTROL CIRCUIT
SUPPLY LINE
STICK CYLINDER CONTROL CIRCUIT
LEFT TRAVEL MOTOR CONTROL CIRCUIT
SYSTEM 14 ATTACHMENT CONTROL CIRCUIT
SWING MOTOR CONTROL CIRCUIT
DRAIN / RETURN LINE
SWING BRAKE CONTROL CIRCUIT
LEFT MAIN PUMP OUTPUT
TRAVEL SPEED CONTROL CIRCUIT
BUCKET CYLINDER CONTROL CIRCUIT
RIGHT TRAVEL MOTOR CONTROL CIRCUIT
BOOM CYLINDER CONTROL CIRCUIT
THIS SCHEMATIC IS FOR THE 330D AND 336D EXCAVATOR
ATTACHMENT: SYSTEM 14 WITHOUT MEDIUM PRESSURE
MEDIA NUMBER: RENR9499
PART NUMBER: 255-5859, 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
LL
MM
HH
GG
FF
EE
SOS
AA
BB
CC
DD
R.C.V : RETURN CHECK VALVE
(8) VALVE GP
NEGATIVE
FLOW CONTROL SOL
171-0188
(6) VALVE GP
4 FUNCTION
WORK TOOL SOL
259-7429
µ
µµ
µµ
µµ
µ
µ
µ µ
µ
µ
µµ
µµ
µµ
µ
µ
µ µ
µ
µ
µµ
µµ
µµ
µ
µ
µ µ
µ
µ
µµ
µµ
µµ
µ
µ
µ µ
µ
µ
µµ
µµ
µµ
µ
µ
µ µ
µ
µ
µµ
µµ
µµ
µ
µ
µ µ
µ
µ
µµ
µµ
µµ
µ
µ
µ µ
µ
µ
µµ
µµ
µµ
µ
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
Pi2
Pi3
Di3
DST
Di1
T
AL4
aL4
SPi
SDr
SP3
Di4
Pi4
Pi1
BP3
BDr BPi
BP2
R3
aR5
AR5
BR5
AR2
BR2
aL3
P
T
A1
A2
B1
B2
SINGLE
DOUBLE
SINGLE
DOUBLE
SWING MOTOR
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
FA1
FB1
DR
DR
IN
OUT
bR5
DR
A
B
A
B
P
A
T
Pi5
A
B
TT
TP
T
PG
PC
P
A1
A2
A3
A4
B4
B3
B2
B1
T
PAC
PP3
PP3
A
B
B
A
T1
T1
TRAVEL MOTOR (LEFT)
TRAVEL MOTOR (RIGHT)
T2
T2
G
F
SP2
AG
AG
BG
BG
E
AG
DR
MU
BG
AG
B
A
Pi1
Ps2
Pi2
D1
Ps1
S1
S
B
Dr1
Psv
a4
a1
a3
L
a2
a5
L1
M1
M2
A4
D0
A1
A2
A3
A4 A5
A6
A7
A8
B1
B2
B3 B4
B5
B6
B7
B8
(15) CYLINDER GP
STICK
(13) CYLINDER GP
BUCKET
(14) CYLINDER GP
BOOM
aL1 bL1 bR1 aR1
BL2 AL2
NO.1
(TRAVEL)
NO.2
(SWING)
NO.3
(LOCK)
AR3
AR4
aR4
BR3
aR3
aR2
bR2
aR1
BR1AR1
aL1
AL1
BL1
aL2
BL2
AL2
BL3 AL3
bL4
bL3 bL2 bL1 bR4
bR3
BR4
bR1
Pb1
Pa1
Pb1Pa1bR2aR2
R.C.V-CR.C.V-B
R.C.V-A
R.C.V-D
R.C.V-C
R.C.V-D
R.C.V-B
R.C.V-A
PL PR
PR
PL
HL
HR
HR
HL
µ
µ µ
µ
µ
µµ
µµ
µµ
µ
DR
A1
B1
DR
DR1
L2
L3
A
B
F2
STICK(2)
BOOM(1)
ATCH
BUCKET
TRAVEL(R)
TRAVEL(L)
SWING
STICK(1)
BOOM(2)
(UP)
(OUT)
(IN)
(R)
(L)
(FWD)
(BACK)
(FWD)
(BACK)
(OPEN)
(CLOSE)
(UP)
(DOWN)
(OUT)
(IN)
ST
SP1
BL3
BT
BP1
BR4
R2
R1
aR3 aR4 bR3 bR4 bL3 bL4 aL2bL2
AL3 BL3
AR3 BR3
AR4 BR4
1RA1RB1LA1LB
(1) BLOCK
168-9759
(4) VALVE GP
1-WAY/2-WAY
CHECK (EC2)
SOLENOID
215-4890
(5) VALVE GP
1-WAY/2-WAY
CHECK (EC3)
SOLENOID
215-4890
(3) VALVE GP
1-WAY/2-WAY
CHECK (EC1)
SOLENOID
215-4890
(9) VALVE GP
SOLENOID AND
RELIEF (ERV1)
244-8506
(10) VALVE GP
SOL AND
RELIEF (ERV3)
244-8506
(2) SENSOR AS
1-WAY/2-WAY FLOW PRESSURE
221-8859
(7) VALVE GP
AUXILLIARY
CONTROL
259-7378
(23) MOTOR GP
SWING
200-3373
(44) VALVE GP
SWING CUSHION
(FINE SWING)
322-8716
(34) VALVE GP
LEFT TRAVEL
COUNTERBALANCE
204-2819
(42) VALVE GP
RIGHT TRAVEL
COUNTERBALANCE
204-2819
(22) MOTOR GP
RIGHT TRAVEL
271-6376
(21) MOTOR GP
LEFT TRAVEL
271-6376
(31) SWIVEL GP
234-4440
(39) VALVE GP
PILOT (TRAVEL)
270-5947
(30) SWITCH AS.
RH TRAVEL
PRESS
167-3466
(28) SWITCH AS.
LH TRAVEL
PRESS
167-3466
(12) BLOCK
(32) VALVE GP
CHECK
(OIL COOLER BYPASS)
190-7745
(20) MOTOR GP
FAN
242-6776
(35) VALVE GP
PILOT CONTROL
(LEFT JOYSTICK)
270-5951
(41) VALVE GP
PILOT CONTROL
(RIGHT JOYSTICK)
270-5952
(43) VALVE GP
SHUTTLE
185-0462
(29) SWITCH AS.
PILOT PRESS
167-3466
SLOW RETURN BYPASS
OIL COOLER
(18) FILTER GP
OIL (HYDRUALIC
RETURN)
188-4140
RETURN
(19) MANIFOLD GP
CONTROL (PILOT OIL)
215-5037
(16) FILTER GP
OIL (CASE DRAIN)
126-2075
(11) ACCUM. GP
164-6981
(40) VALVE GP
PRESSURE REDUCING
(BOOM, SWING PRIORITY)
232-4102
(33) VALVE GP
SOLENOID
(HEAVY LIFT)
121-6303
(17) FILTER GP
OIL (PILOT)
158-8987
(24) PUMP GP
PISTON
(HYDRAULIC FAN)
259-0815
(25) PUMP GP
PISTON (MAIN)
283-6116
(27) SENSOR AS
RIGHT PUMP
PRESSURE
221-8859
(26) SENSOR AS
LEFT PUMP
PRESSURE
221-8859
(38) VALVE GP
MAIN CONTROL
285-1536
(36) VALVE GP
LOAD CONTROL
(BOOM)
255-5683
(37) VALVE GP
LOAD CONTROL
(STICK)
255-5680
MACHINE COMPONENT LOCATIONS
44
44
43
43
42
42
41
41
40
40
39
37
37
36
36
35
35
34
34
33
33
32
32
31
31
30
29
29
28
27
27
26
26
23
23
22
22
21
21
21
20
19
19
18
18
15
15
14
14
14
13
13
11
11
VIEW ALL CALLOUTS
LINES GROUP - FRONT BOOM CYLINDER
WEIV TNORFWEIV POT
SECTION C-C
SECTION B-B
38
10
9
7
5
4
3
2
VIEW ALL CALLOUTS
D
D
LINES GROUP - PILOT-COMBINED FUNCTION, JOYSTICK W/SLIDE CONTROL
EE
FF
GG
HH
LL
MM
6
1
8
25
SECTION D-D
PUMP COMPARTMENT VIEW
LINES GROUP - PILOT-COMBINED FUNCTION, JOYSTICK
W/SLIDE CONTROL
D
D
SECTION D-D
PUMP COMPARTMENT VIEW
MM
LL
HH
GG
FF
EE
8
6
1
VIEW ALL CALLOUTS
MAIN PUMP AND FILTER GROUP
SOS
DD
CC
BB
AA
25
24
1716
VIEW ALL CALLOUTS
