SENR8908-01
12 Page, (Dimensions: 25 inches x 24 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
AB
PT
AB
PT
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)
©
2006 Caterpillar
All Rights Reserved
Printed in U.S.A.
Two-Speed Hammer
SENR8908-01
December 2006
350 & 350L Excavator
Hydraulic System - Attachment
350:
3ML685-UP
2ZL171-UP
350L:
9FL420-UP
SENR8908-01
12 Page (Dimensions: 25 inches x 24 inches)
Components are shown installed on a fully operable machine with the key and engine
off and transmission shifter in neutral.
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations
THIS SCHEMATIC IS FOR THE 350 & 350L EXCAVATOR TWO-SPEED HAMMER - ATTACHMENT
PART #: 103-1351-01
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Air Line
A
B
C
D
E
F
G
H
I
1234567891011
A
B
C
D
E
F
G
H
I
1234567891011
P
A
T
P1
T
P2PI
DR
S
P
B1
T
B2
B3
B4
B5
DR5
JPD
JDJPG
JP1
PI1
PI2
PI3
DR1
DR2
DR3
TOUT
PIN
PG
DR4
PI4
SD1
A
AR3AL3
BR3BL3
ATT
AR3BR3AL3BL3
AL2
BM2IMP1AL2
CLOSECLOSE
LS
OPENOPEN
BL2
BR
XA
PD
JL3JL1JR3 JR1JR2
(REV)(FWD)
TRTTLP
TLA1TLA2
MA
G
A
ST2
TRA2TRA1(FWD)(REV)
TRPTLT
(CLOSE)
PUMP CONTROL
PRESSURE SWITCH
SOLENOID VALVE
ON : H MODE
OFF : L, S MODE
PUMP CONTROL
PRESSURESWITCH
PI
R
M
PR
PG
E
F
DSH
XB
MA
SH D
F
E
PT
M2
M1
P1
T
P2
PI
DR
REV
FWD
FWD
REV
A2
(OPEN)(UP)
JL2JL4JR4
AL1AR1BL4
AL4 BR1
PFPR
BL1
AL4 BR1
R2
AR1 BL1 AL1
IMP2
PSW
PTA
TR
BM1
PG
PR
BL4
BL2
A3
A4
A5
A1
DSDR1
T
R1
Z
Y
(DOWN)(CLOSE)(OPEN)
M
PI2PI1
T
PD
T1
L'
L
P
BR
MB
MA
MB
A
B
T1
A'
B'
BA
T2
PS1
X
LS1
S1DR1 DR2
LS2
T2
HL1
MA
BA
PS
SA2
M2
P2P1M1
TRAVEL ALARM
PRESSURE SWITCH
SA1
ENGINE SPEED
SIGNAL
X
DOWN
UP
SWING 2 STEP
POWER CONTROL
SWING PUMP
STICK CYLINDER
FRONT
BOOM CYLINDER
SWIVEL
SWING
FRONT
BOOM
TRAVEL(L)
TRAVEL(R)
(REAR)
(FRONT)
UP
DOWN
RIGHT LEFT
TRACK
STICKBUCKET
BUCKET CYLINDER
2 SPEED
IN
OUT
HAMMER
STICKSWING
BOOM
BUCKET
TRAVEL(R)TRAVEL(L)
