RENR9582-08
24 Page, (Dimensions: 34 inches x 28 inches)
Hydraulic Symbols (Electrical)
Electrical Symbols Table
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)
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
FLUID POWER SYMBOLS
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 ACTING
SINGLE 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
AB
PT
AB
PT
SHIFTED POSITION
INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOT
CONTROLLED
T
Heavy Lift and Fine Swing
RENR9582-08
January 2012
329D, 330D, 336D and 340D Excavator
©
2012 Caterpillar
All Rights Reserved
Printed in U.S.A.
336D MHPU
Hydraulic System
329D:
JBF1-UP
330D:
GBC1-UP
GGE1-UP
THJ1-UP
ERN1-UP
RAS1-UP
336D:
LMG1-UP
MYG1-UP
PPN1-UP
JWR1-UP
DTS1-UP
336D MHPU:
L5K1-UP
M3M1-UP
M3N1-UP
MDS1-UP
340D:
JTN1-UP
Description
Part
Number
Machine
Location
Schematic
Location
Accumulator Gp - Hydraulic (Charged) 164-6981 B-5
Cylinder Gp - Boom NOTE A F-2
Cylinder Gp - Bucket NOTE A F-8
Cylinder Gp - Stick NOTE A F-7
Filter & Valve Gp - Pilot (Hydraulic Oil) 158-8987 A-4
Filter Gp - Oil (Hydraulic Return) 188-4140 A-6
Filter Gp - Oil (Hydraulic, Case Drain) 289-8194 A-5
Manifold Gp - Control (Pilot Oil) 215-5037 A-6
Motor Gp - Piston (Fan) 234-4638 A-8
Motor Gp - Swing 200-3373 F-6
Motor Gp - Travel
271-6376
F-5
F-3
Left
Right
Left
Right
Pump Gp - Piston (Hydraulic Fan) 259-0815 B-3
Pump Gp - Piston (with Pilot Gear Pump) 322-8733 B-2
Swivel Gp 234-4440 E-4
Valve Gp - Check (Oil Cooler Bypass) (Control Valve) 190-7745 A-8
Valve Gp - Load Control (Boom Drift Red, Line Relief) 255-5683 D-2
Valve Gp - Load Control (Stick Drift Red, Line Relief) 255-5680 D-6
Valve Gp - Main Control 285-1345 C-1
Valve Gp - Pilot (Joystick, LH) 297-0533 C-8
Valve Gp - Pilot (Joystick, RH) 297-0532 C-7
Valve Gp - Pilot (Travel) 310-0414 E-8
Valve Gp - Pressure Reducing (Boom Priority) 232-4102 A-7
Valve Gp - Pressure Reducing (Boom Up Priority) (Stick-In Priority) 206-3354 B-7
Valve Gp - Pressure Reducing (Boom, Swing Priority) 232-4102 B-4
Valve Gp - Shuttle
185-0462 B-8
123-2430 B-4
Valve Gp - Solenoid (Heavy Lift) 121-6303 B-4
Valve Gp - Travel Counterbalance
204-2819
E-5
E-4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Valve Gp - Cushion Crossover Relief 158-9085 E-629
30
31
Note A: Refer to Parts Manual for your specific machine.
Component Locations
Tap Locations
Pressure, Sampling, and Sensor
Tap
Number
Description
Schematic
Location
AA Pilot Filter Pressure Test Port A-4
BB Drive Pump Pressure Test Port B-2
CC Power Shift Pressure Test Port A-2
DD Idler Pump Pressure Test Port A-2
SOS Hydraulic Oil Sampling Port A-4
MACHINE COMPONENT LOCATIONS
MOTOR GP - PISTON (TRAVEL)
ACCUMULATOR
MOTOR GP - SWING AND SWIVEL
VALVE GP - MAIN CONTROL
PUMP GP - PISTON (MAIN)
19
10
30
11
8
25
15
1
14 5
6
7
CC
3
4
SOS
AA
BB DD
2
15
22
21
20266
1918
16
278
9
10 29
57
3112
3011
14
13
23171
282524
RENR9582-08
24 Page, (Dimensions: 28 inches x 00 inches)
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Attachment
Air Line
CALLOUTS
Taps (Pressure, Sampling,Sensor) by letter
Components by number
YY
52
DRAIN / RETURN LINE
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
IMPLEMENT AND LEFT TRAVEL PUMP OUTPUT
IMPLEMENT AND RIGHT TRAVEL PUMP OUTPUT
POWERSHIFT CONTROL CIRCUIT
PILOT PUMP OUTPUT
ATTACHMENT CONTROL CIRCUIT
HYDRAULIC FAN PUMP OUTPUT
SUPPLY LINE
BUCKET CONTROL AND BUCKET CYLINDER CIRCUIT
RIGHT TRAVEL CONTROL AND RIGHT TRAVEL MOTOR CIRCUIT
TRAVEL SPEED CONTROL CIRCUIT
STICK CONTROL AND STICK CYLINDER CIRCUIT
SHUTTLE VALVE CONTROL CIRCUIT
BOOM CONTROL AND BOOM CYLINDER CIRCUIT
SWING BRAKE CONTROL CIRCUIT
HEAVY LIFT CONTROL CIRCUIT
LEFT TRAVEL CONTROL AND LEFT TRAVEL MOTOR CIRCUIT
SWING CONTROL AND SWING MOTOR CIRCUIT
THIS SCHEMATIC IS FOR THE 329D, 330D, 336D, AND 340D
EXCAVATOR AND 336D MHPU HYDRAULIC SYSTEM
MEDIA NUMBER: RENR9582-08
PART NUMBER: 259-7491, CHANGE: 02, VERSION: HE
Components are shown installed on a fully operable machine.
Refer to the appropriate Service Manual for Troubleshooting, Specifications.
12345678
A
C
D
E
F
B
12345678
D
E
F
A
B
C
TRAVEL(L)
TRAVEL(R)
VALVE GP
PILOT (TRAVEL)
310-0414
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
JR1
JR2
JR3
JR4
A1
A2
A3
A4
A5
A6 A7
A8
B1
B2 B3
B4
B5
B6
B7
B8
TRAVEL MOTOR (LEFT)
TRAVEL MOTOR (RIGHT)
T1
Pp3
Pp3
T1
A
B
AB
STICK
CYLINDER
BOOM
CYLINDER
BUCKET
CYLINDER
P2
Pi1
P1
DR1
DR2
DR3
DR4
DR5
DR6
P-IN
PSA1
PSA2
T-OUT1
T-OUT2
Pi2
Di2
Pi2
Pi3
Di3
DST
bR2
Di1
T
AL4
aL4
SPi
SDr
SP3
Di4
Pi4
Pi1
BP3
BDr
BPi
BP2
R3aR5
AR2
BR2
aR2
BOOM
CYLINDER
SWING MOTOR
P1
P2
T
A1
A2
B1
B2
aL3
MOTOR GP
SWING
200-3373
VALVE GP
CUSHION
CROSSOVER
RELIEF
158-9085
MOTOR GP
TRAVEL
271-6376
VALVE GP
TRAVEL COUNTERBALANCE
204-2819
MOTOR GP
TRAVEL
271-6376
VALVE GP
TRAVEL COUNTERBALANCE
204-2819
SWIVEL GP
234-4440
VALVE GP
LOAD CONTROL
(BOOM DRIFT, RED
LINE RELIEF)
255-5683
VALVE GP
LOAD CONTROL
(STICK DRIFT, RED
LINE RELIEF)
255-5680
VALVE GP
MAIN CONTROL
285-1345
VALVE GP
CHECK
(OIL COOLER BYPASS)
190-7745
FILTER GP
OIL (RETURN)
188-4140
FILTER GP
OIL (CASE DRAIN)
289-8194
VALVE GP
SHUTTLE
185-0462
MANIFOLD GP
CONTROL (PILOT)
215-5037
FILTER AND
VALVE GP
PILOT
158-8987
JRP
JRT
VALVE GP
PILOT (JOYSTICK, LH)
297-0533
VALVE GP
PILOT
(JOYSTICK, RH)
297-0532
ACCUMULATOR GP
164-6981
bR5
IN
OUT
T
TT
TP
PG PC
PAC
R.C.V. : RETURN CHECK VALVE
Pi5
VALVE GP
SOLENOID
(HEAVY LIFT)
121-6303
VALVE GP
PRESSURE
REDUCING
(BOOM, SWING
PRIORITY)
232-4102
T2
T2
D
EF
G
SP2
AG
AG
BG
BG
A1
P
T
T
B1 A1 B2 A2
P1
P2
VALVE GP
PRESSURE REDUCING
(BOOM UP PRIORITY)
(STICK IN PRIORITY)
206-3354
VALVE GP
PRESSURE REDUCING
(BOOM PRIORITY)
232-4102
AR5BR5
P
A
T
PG
DR
BG
AG
B
A
Pi1
Ps2
Pi2
D1
Ps1
S1
S
B
Dr1
LEFT
PUMP
PILOT
HYDRAULIC FAN
IDLER
RIGHT
PUMP
PRESSURE SENSOR
(IDLER PUMP)
PRESSURE SENSOR
(DRIVE PUMP)
DRIVE
Psv
a4
a1
a3
L
a2
PUMP GP
PISTON
322-8733
a5
L1
PUMP GP
PISTON
(HYDRAULIC FAN)
259-0815
M1
M2
A4
D0
MOTOR GP
PISTON (FAN)
234-4638
VALVE GP
SHUTTLE
123-2430
aL1 bL1 bR1 aR1
AL3 BL3
AR4 BR4
AR3 BR3
AL2BL2
aR3-a aR4 bR3 bR4 bL3-a bL2 bL4 aL2
bL3 bL2
bL1
bR1
bR3 bR4
BL3 AL3
AL1AL2
BL1BL2
aL2
aR1
AR1
BR1 AR3BR3
BR4
AR4
aL1
aR3 aR4
NO.1
(TRAVEL)
NO.2
(SWING)
NO.3
(LOCK)
bL4
AR1BR1AL1BL1
R.C.V.-C
R.C.V.-B
R.C.V.-A
R.C.V.-A
R.C.V.-B
R.C.V.-C
PRPL
PL
PR
HR
HR
HL
HL
bL3aR3
aR3-a bL3-a
A1
B1
DRDR1 L2L3
A
B
STICK(2)
BOOM(1)
ATCH
BUCKET
TRAVEL(R)
TRAVEL(L)
SWING
STICK(1)
BOOM(2)
(UP)
(OUT)
(IN)
(R)
(L)
(BACK)
(FWD)
(BACK)
(OPEN)
(CLOSE)
(UP)
(DOWN)
(OUT)
(IN)
BTBP1
BR4
SP1
ST
BL3
R1
R2
PROPORTIONAL
REDUCING VALVE
HYDRAULIC TANK
SLOW RETURN BYPASS
DD
CC
BB
AA
SOS
