RENR9994-03
May 2011
System 3 Prime: Two Pump / One-Way Flow
330D, 336D, and 340D Excavator
Hydraulic System - Attachment
330D:
NBD1-UP
EAH1-UP
FFK1-UP
EDX1-UP
MEY1-UP
336D:
PRF1-UP
WRK1-UP
MPL1-UP
JBT1-UP
KKT1-UP
PGW1-UP
Printed in U.S.A.© 2010 Caterpillar, All Rights Reserved
340D:
JTN1-UP
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)
PUMP
(2 - SECTION)
SPRING
(ADJUSTABLE)
VARIABILITY LINE RESTRICTION
(VARIABLE)
PRESSURE
COMPENSATION
PUMP
(VARIABLE & PRESSURE
COMPENSATED)
MEASUREMENT
PRESSURE TEMPERATURE FLOW
ROTATING SHAFTS
UNIDIRECTIONAL BIDIRECTIONAL
PUSH - PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
VALVE ENVELOPES VALVE PORTS
FLUID CONDITIONERPUMP OR MOTOR
FLUID POWER SYMBOLS
UNIDIRECTIONAL
BIDIRECTIONAL
RELEASED PRESSURE
EXTERNAL RETURN INTERNAL RETURN
REMOTE SUPPLY PRESSURE
SIMPLIFIED
HYDRAULIC PUMPS
ACCUMULATORS
SPRING LOADED GAS CHARGED
SOLENOID
OR MANUAL
SOLENOID
& PILOT
SOLENOID &
PILOT OR MANUAL
SOLENOID SERVO THERMAL DETENT
HYDRAULIC & PNEUMATIC CYLINDERS
DOUBLE ACTINGSINGLE ACTING
BASIC
SYMBOL
SPRING
LOADED
CHECK VALVES
2 POSITION
INFINITE
POSITIONING
FLOW IN ONE
DIRECTION
FLOW IN
EITHER
DIRECTION
3 POSITION
CROSS
FLOW
PARALLEL
FLOW
INTERNAL PASSAGEWAYS
NORMAL POSITION
AB
PT
AB
PT
SHIFTED POSITION INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOT
CONTROLLED
MAIN AUX
LINE RESTRICTION
(VARIABLE & PRESSURE
COMPENSATED)
MANUAL CONTROL SYMBOLS
HYDRAULIC MOTORS
FLUID STORAGE RESERVOIRS
CROSSING & JOINING LINES
VALVES
PILOT CONTROL SYMBOLS
COMBINATION CONTROLS
BASIC COMPONENT SYMBOLS
ENERGY TRIANGLES
HYDRAULIC PNEUMATIC
INTERNAL
SUPPLY PRESSURE
COMPLETE
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
HYDRAULIC SYMBOLS (ELECTRICAL)
ELECTRICAL SYMBOLS TABLE
325-AG135 PK-14
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
WIRE
WIRE
(EXAMPLE VALVE)
CURRENT STANDARD
TRANSDUCER
(FLUID)
M
ELECTRIC MOTORTRANSDUCER
(GAS / AIR)
G
GENERATOR
PRESSURE SWITCH ELECTRICAL WIREPRESSURE SWITCH
(ADJUSTABLE)
TEMPERATURE
SWITCH
PRESSURE
SWITCH
TEMPERATURE
SWITCH
LEVEL
SWITCH
FLOW
SWITCH
ELECTRICAL SYMBOLS (ELECTRICAL)
A
CIRCUIT NUMBER
IDENTIFICATION
WIRE
COLOR
WIRE GAUGE
T
RENR9994-03
24 Page, (Dimensions: 34 inches x 28 inches)
Tap Locations
Pressure, Sampling, and Sensor
Tap
Number
Description
Schematic
Location
AA Pilot Filter Pressure Test Port A-3
BB Drive Pump Pressure Test Port B-1
CC Power Shift Pressure Test Port B-1
SOS Hydraulic Oil Sampling Port A-3
DD Idler Pump Pressure Test Port B-1
Description
Part
Number
Machine
Location
Schematic
Location
E-4
Accumulator GP - Pilot Manifold Note B 20 B-4
Block Note B 21 C-6
Cylinder GP - Boom Note A 22 F-7
Cylinder GP - Stick Note A 24 F-7
Filter GP - Case Drain Note B 25
A-3
Filter GP - Pilot Hydraulic Note B 26
A-4
Filter GP - Return Oil Note B 27 B-5
Manifold GP - Control Note B 28 B-4, B-5
Motor GP - Swing Note B 29 F-5
Motor GP - Left Travel Note B 30 F-3
Motor GP - Right Tr
avel Note B 32 F-2
Pump GP - Main Hydraulic Note B 33 B-2
Sensor AS - Left Pump Pressure Note B 35 B-1
Sensor AS - Right Pump Pressure Note B 36 B-1
Switch AS - LH Travel Pressure Note B 37 E-7
Switch AS - Pilot Pressure Note B 38 A-7
Switch AS - RH Travel Pressure Note B 39 E-6
Swivel GP Note B
40
E-3
Tank GP - Hydraulic Oil Note B 41 A-5
Valve GP - Cooler Bypass Note B 42 B-5
Valve GP - LH Joystick Note B 43 B-7
Valve GP - Load Control Boom Cylinder Note B 4
4D-1
Valve GP - Load Control Stick Cylinder Note B 45 D-4
Valve GP - Main Control Note B 46 C-1 thru C-6
Valve GP - Pilot Travel Note B
4
E-6, E-7
Valve GP - Pressure Reducing Boom/Swing Note B
47
B-3
Valve GP - RH Joystick Note B 49 B-7
Valve GP - Shuttle Note B 50 B-6, B-7
Valve GP - Swing Cushion Note B 51 E-5
Note A: Refer to parts manual for specific cylinder information.
Component Locations
Two Pump / One-Way Flow Attachment
Standard 330D and 336D
Note B: Part numbers are located on the main Hydraulic System Schematic according to
the effectivity of the machine.
Valve GP - Travel LH Counterbalance Note B 52
E-3
Valve GP - Travel RH Counterbalance Note B E-2
Cylinder GP - Bucket Note A 23 F-6
Valve GP - Pilot 206-3336 F-5
Valve GP - Relief
48
177-2653
Valve GP - Negative Flow 171-0188 E-1
Valve GP - Control Auxiliary 259-7378 C-5
3
1
2
Motor GP - Fan Note B 31 A-6
Pump GP - Hydraulic Fan Note B 34 B-3
53
363534
41
5230 42 49 43 21 50 383
46
2
1
45
44
48
28
20
4
37
39
47
24
23
22
32
53
25 26 27 41 29 51
40
24
23
42
46453442149
43
48
28
20
27
26
25
533230 52 4
37
39 4729 51 40 21 38 50
22
31 33
36
35
34
31
33
25
35
FF
KK
JJ EE
HH
GG
SOS
33
27
2636
B
VIEW B
FWD
TOP VIEW
RIGHT SIDE VIEW
1
44
2
33
2
2
NEGATIVE FLOW VALVE GROUP
MACHINE COMPONENT LOCATIONS
MAIN PUMP AND FILTER CIRCUITS
RENR9994-03
24 Page, (Dimensions: 34 inches x 28 inches)
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.
THIS SCHEMATIC IS FOR THE 330D, 336D, and 340D EXCAVATOR
ATTACHMENT: SYSTEM 3 PRIME: TWO PUMP / ONE-WAY FLOW
PART NUMBER: 255-5855, CHANGE: 01, VERSION: HE
A
B
C
D
E
F
1234567
A
B
C
D
E
F
1234567
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
PILOT PUMP OUTPUT
SUPPLY LINE
DRAIN / RETURN LINE
SWING BRAKE CONTROL CIRCUIT
IMPLEMENT AND LEFT TRAVEL PUMP OUTPUT
IMPLEMENT AND RIGHT TRAVEL PUMP OUTPUT
ATTACHMENT CONTROL CIRCUIT
BUCKET CONTROL AND BUCKET CYLINDER CIRCUIT
RIGHT TRAVEL CONTROL AND RIGHT TRAVEL MOTOR CIRCUIT
FAN PUMP OUTPUT
POWER SHIFT CONTROL CIRCUIT
TRAVEL SPEED CONTROL CIRCUIT
STICK CONTROL AND STICK CYLINDER CIRCUIT
BOOM CONTROL AND BOOM CYLINDER CIRCUIT
HEAVY LIFT CONTROL CIRCUIT
LEFT TRAVEL CONTROL AND LEFT TRAVEL MOTOR CIRCUIT
SWING CONTROL AND SWING MOTOR CIRCUIT
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
CALLOUTS
Taps (Pressure, Sampling, Sensor - by letter)
YY
TRAVEL(L) TRAVEL(R)
T1 T5
BACKFWDBACK FWD
T2 T4 T6 T3
JLP JLT
STICK
SWING
OUT
JL1
IN
JL3
RL
JL2 JL4
BUCKET BOOM
OPEN CLOSE DOWN UP
JR1JR2 JR3JR4
JRPJRT
Di2 Pi2 Pi3 Di3 DST Di1
T aL4
SPi
SDr
SP3
Di4 Pi4 Pi1
BP3
BDr
BPi
BP2
R3aR5
AR5BR5
AR2
BR2
aL3
P
T
A1
A2
B1
B2
SINGLESINGLE
SWING MOTOR
E
F
G
P1 P2
B1 B2A1 A2
T
P2 Pi1
P1
DR1
DR2
DR3 DR4
DR5
DR6
P-IN
PSA1
PSA2
T-OUT1
T-OUT2
Pi2
INOUT
T
bR5
1
2
RP RT
3
TTTP
PG PC
SP2
PAC
T2
T2
Pb1 bR2
AL4
PG
DR
MU
BG
AG
BA
AG
BGBG
AG
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
TRAVEL MOTOR (LEFT) TRAVEL MOTOR (RIGHT)
T1
Pp3Pp3
T1
AB
AB
aL1 bL1 bR1 aR1
BL2 AL2
NO.1
(TRAVEL)
NO.2
(SWING)
NO.3
(LOCK)
AR3
AR4
aR4
BR3
aR3aR2aR1
BR1AR1
aL1
AL1
BL1
aL2
BL2
AL2
BL3 AL3
bL4 bL3 bL2 bL1
bR4bR3
BR4
bR1
aR2
R.C.V-A
R.C.V-A
R.C.V-B
R.C.V-B
R.C.V-C
R.C.V-C
R.C.V-D
R.C.V-D
PL
PL
PR
PR
HL
HR
HL HR
Pa1
Pa1
DR
A1B1
DR
DR1
L2L3
AB
FA1
FB1
F2
BT
R2
SP1 ST
BL3
BP1
BR4 R1
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)
aR3 aR4 bR3 bR4 bL3 bL4 aL2bL2
BL1 AL1 BR1 AR1
(2) VALVE GP
NEGATIVE FLOW
171-0188
(1) VALVE GP
COTROL
AUXILIARY
259-7378
(44) VALVE GP
LOAD CONTROL BOOM CYLINDER
(46) VALVE GP
MAIN CONTROL
(45) VALVE GP
LOAD CONTROL
STICK CYLINDER
(32) MOTOR GP
RIGHT TRAVEL
(30) MOTOR GP
LEFT TRAVEL
(29) MOTOR GP
SWING
(26) FILTER GP
PILOT HYDRAULIC
(20) ACCUMULATOR GP
PILOT MANIFOLD
(41) TANK GP
HYDRAULIC OIL
(48) VALVE GP
PRESSURE
REDUCING
BOOM/SWING
(28) MANIFOLD GP
CONTROL
(25) FILTER GP
CASE DRAIN
(43) VALVE GP
LH JOYSTICK
(49) VALVE GP
RH JOYSTICK
(39) SWITCH AS
RH TRAVEL
PRESSURE
(37) SWITCH AS
LH TRAVEL
PRESSURE
(47) SWITCH AS
PILOT PRESSURE
(42) VALVE GP
COOLER BYPASS
(50) VALVE GP
SHUTTLE
(36) SENSOR AS
RIGHT PUMP PRESSURE
(35) SENSOR AS
LEFT PUMP PRESSURE
(21) BLOCK
(47) VALVE GP
PILOT TRAVEL
(51) VALVE GP
SWING CUSHION
(53) VALVE GP
TRAVEL RH COUNTERBALANCE
(52) VALVE GP
TRAVEL LH
COUNTERBALANCE
(40) SWIVEL GP
(24) CYLINDER GP
STICK
(23) CYLINDER GP
BUCKET
AL3 BL3
AR3 BR3
AR4 BR4
(22) CYLINDER GP
BOOM
(4) VALVE GP - RELIEF
177-2653
(3) VALVE GP
PILOT
206-3336
(27) FILTER GP
RETURN OIL
DD
CC
BB
AA
SOS
(34) PUMP GP
HYDRAULIC FAN
(33) PUMP GP
MAIN HYDRAULIC
(31) MOTOR GP
FAN
