SENR1981-00
24 Page, (Dimensions: 34 inches x 28 inches)
Combined Two Pump Flow with Counter Weight Removal
SENR1981
October 1997
345B and 345B L Excavators
Hydraulic System - Attachment
345B:
4SS1-UP
345B L:
9GS1-UP
©
1997 Caterpillar
All Rights Reserved
Printed in U.S.A.
Item
Component
No.
ATTACHMENT COMPONENTS
E14698
Relief Valve Gp- One Way
Ball Valve Gp
Relief Valve Gp- Two Way
Pressure Switch As- Pilot Oil
Shuttle Valve As
Flow Control Valve Gp
Logic Valve Gp
Auxiliary Pilot Valve Manifold
1
2
3
4
5
6
7
8
1
5
5
6
8
3
4
2
7
5
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)
SENR1981-00
24 Page,Dimensions: 34 inches x 28 inches
B A
DR1
MU
PG1
MU
DR2
AB
PG2 PG3
(COOLANT)
B
STICK
SWING
BOOMBUCKET
JR1
JR3
JR4
JR2
JRT
JRP
JL2 JL4
JL1
JL3
JLT
JLP
AR1
BR1
AL2
BL2
X
DR
HL
dL5
aL5
BL4
bL4
AL3
BL3aL3
bL2
AL1BL1aL1
PSW
aR1
aR2
AR2
BR2
bR3
aR4
Y
HR
AR4
R1
dSW
bR2 bR1 PLPR
Pp1
bL1
PAT
aL2 bL3 aL4
BOOM(1)
BUCKET
ATCH
TRAVEL(R)
PiL
aR3
dR4
SA5
SA4
SA3
SA2
SA1
SB5
SB4
SB3
SB2
SB1
SP
(B)
BPi
(F)
(B)
(R)
(L)
SWING
(F)
L
L1
S
X
(DOWN)
(OPEN)
(FWD)
(FWD)
(L)
(IN)
(UP)
(CLOSE)
(UP)
(IN,OUT,DOWN)
dR5
(BACK)
(BACK)
(R)
C
P
AR3
V
X
R1
S
R2
X1
X2
M3
X3
A1
M1
A2
M2
R1
A3
Dr
Pi1
T1
RIGHT
P
L'L'
T
C
(OUT)
B1
BR3
R2
B' A'
BR
R3
A1
BR
MB
MA
MB
A'B'
T1
LEFT
APi2
A'
T
PP2
P
Pi8
PSA
PG
B'
STICK(1)
STICK(2)
BOOM(2)
TRAVEL(L)
T
S3
S2S1
TOUT
DR1
DR2DR3
P
B
A
SINGLE
ACTION
DR4
DR5
DR6
(SLOW)
Pi3
(TRAVEL)
(SWING)
PIN
PEU
(PUMP)
Pi1
Pi2
C/V
DOUBLE
ACTION
DOUBLE
JPi
Pi5
SINGLE
(RELIEF)
T2
DOUBLE
PTA
X
T2
SINGLE
MA
(OIL)
TT
TP
TRAVEL(R)
PAC
TRAVEL(L)
TLA1
BDr
X1
TLA2 TRA2
TRA1
X2
B
PSL
A
X
FOR SINGLE
ACTION
APi
ADr
AL4
SWING
MOTORS
TRACK MOTORS
STICK
CYLINDER
BUCKET
CYLINDER
BOOM
CYLINDERS
COUNTER
WEIGHT
REMOVAL
1
2
3
4
5
5
5
6
7
8
This Attachment Schematic is intended to
be used in conjunction with the Standard
Hydraulic Schematic in this Service Manual.
Hydraulic Schematic
MAIN CONNNECTOR LINE
PILOT LINE
DRAIN LINE
149-7572
E14700
