SENR6035
16 Page, (Dimensions: 24 inches x 34 inches)
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
A B
P T
A B
P T
SHIFTED POSITION
INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOT
CONTROLLED
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
T
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
Electrical Symbols (Electrical)
Common Action
SENR6035
September 2006
375 & 375L Excavators
Hydraulic System - Attachment
375:
8XG1-UP
8WJ1-UP
6NK1-UP
375L:
6RL1-UP
9WL1-UP
1JM1-UP
©
2006 Caterpillar
All Rights Reserved
Printed in U.S.A.
SENR6035
16 Page, Color 2, (Dimensions: 24 inches x 34 inches)
THIS SCHEMATIC IS FOR THE 375 AND 375L
Components are shown installed on a fully operable machine with the key and engine off.
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations
UP
REV
REV
OPEN OPEN
CLOSE CLOSE
Item No.
1
2
ATTACHMENT COMPONENTS
Component
Valve Assembly (Manual)
Pilot Valve ( Foot Opertated)
1
1
2
1
1
2
2
BOOM CYLINDER
TRACK
SWING
BUCKET
CYLINDER
STICK
CYLINDER
P T
A1
A2
R1
ATT
BL2
bL2
RIGHT LEFT
PILOT LINE
DRAIN LINE
This Attachment Schematic is intended to
be used in conjunction with the Standard
Hydraulic Schematic in this Service Manual.
Hydraulic Schematic
MAIN CONNECTOR LINE
108-7162
SINGLE
ACTION
SINGLE
ACTION
DOUBLE
ACTION
DOUBLE
ACTION
SINGLE
DOUBLE
TRTTLP
TLA1
TLA2
TRA2
TRA1
TRPTLT
BUCKET BOOM SWING STICK
TRAVEL (L)
TRAVEL (R)
JL3JLJR3
JR1
JR2
(CLOSE)
A2
(OPEN)
(UP)
JL2JL4JR4
A3
A4
A5
A1
S
P
B1
T
B2
B3
B4
B5
(DOWN)(CLOSE)
(OPEN)
DR5
JPd
Jd
JPg
JP1
Pi1 Pi2 Pi3
DR1
DR2
DR3
TOUT
PIN
PG
DR4
Pi4
SD1
A
PUMP CONTROL
PRESSURE SW
SWING 2 STEP
POWER CONTROL
SOLENOID VALVE
ON : H MODE
OFF : L,S MODE
PD
Pi
R
M
PR
PG
E
F
D
SH
SH D
F
E
P
T
M2
M1
PG
PR
M
PD
PUMP CONTROL
PRESSURE SW
M1
REAR
FRONT
D
D
BM
AM
G
X
X
SWIVEL
Pb
BM
AM
G
X
X
Pb
aL4
bR1 bL1
IMP2
PSW
PTA
TRBM1
TRAVEL ALARM
PRESSURE SW
aR3
aL3
DS
dR1
BM2
IMP1aL2
HL1
aL1
aR1
bL4AL4
BR1
R2
AR1
BL1 AL1
BL4
TRAVEL(R)
TRAVEL(L)
BOOM
FWD FWD
DOWN
bR3
bL3
PFPR
LS
AR3
BR3
AL3
BL3
BUCKET
STICK
AL2
