RENR2986-01
16 Page, (Dimensions: 34 inches x 24 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
A B
P T
A B
P T
SHIFTED POSITION
INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOT
CONTROLLED
T
RENR2986-01
August 1998
345B and 345B L Excavators
Hydraulic System
345B:
2ZW1-UP
6XS1-UP
6MW1-UP
8KW1-UP
345B L:
3MW1-UP
5WS1-UP
8RW1-UP
9CW1-UP
©
1998 Caterpillar
All Rights Reserved
Printed in U.S.A.
COMPONENT LIST
Item
No.
Description
Item
No.
Description
1 Stick Cylinder 32 Main Hydraulic Pump Group
2 Swing Motor (Left) 33 Sensor Assembly
3 Pressure Control Valve (Swing) 34 Control Valve- Stick (2)
4 Swing Motor (Right) 35 Control Valve- Boom (1)
5 Travel Motor (Left) 36 Control Valve- Bucket
6 Travel Brake Valve (Left) 37 Control Valve-Attachment
7 Travel Motor (Right) 38 Control Valve- Travel ®
8 Travel Brake Valve (Right) 39 Control Valve- Travel (L)
9 Bucket Cylinder 40 Control Valve- Swing
10 Boom Cylinder 41 Control Valve- Stick (1)
11 Swivel 42 Control Valve- Boom (2)
12 Pressure Switch (Boom Raise) 43 Line Relief Valve- Stick
13 Pilot Control Valve (Travel) 44 Drift Reduction Valve- Stick
14 Pressure Switch (Implement Swing) 45 Line Relief Valve- Bucket (Close)
15 Pressure Switch (Travel) 46 Relief Valve- Main
16 Main Control Valve 47 Drift Reduction Valve- Boom
17 Pilot Control Valve (Swing/Stick) 48 Unload Valve- Stick
18 Pilot Filter 49 Relief Valve- Stick (2) Neg. Flow Control
19 Cooling Pump 50 Line Relief Valve- Boom (1)
20 Hydraulic Activation Control Valve 51 Line Relief Valve- Bucket (Open)
21 Drain Filter 52 Line Relief Valve- Stick (1)
22 Accumulator 53 Relief Valve-Boom (2) Neg. Flow Control
23 Pilot Control Valve (Boom/Bucket) 54 Regeneration Valve- Stick
24 Slow Return Check Valve 55 Pressure Control Valve
25 Bypass Check Valve 56 Control Valve- Travel (Straight)
26 Return Filter 57 Relief Valve- Pilot Pressure
27 Pilot Valve Manifold 58 Solenoid Valve- Pump
28 Cooling Pump Relief Valve 59 Solenoid Valve- Swing
29 Fan Motor Bypass Valve 60 Solenoid Valve- Travel
30 Fan Motor 61 Solenoid Valve- Fine Control
31 Hydraulic Tank 62 Check Valve
Main Hydraulic Valve
Pp1 Pp2
Api
ADr
AR3
AR4
BR2
AR2
Y
BR3
BR1
AR1
AL1
BL1
AL2
BL2
AL3
BL3
AL4
BL4
X
R2
Bpi
BDr
R3
R1
HR
HL
bL5
bR4
DR
PAT
aL5
aL3 aL2
aL1
dST1
aR1 aR2
bR3
PSL
bL3
bL1
bL2
bR1
bR2aR3
PiL
dsW
PSW
PTA
PL
PR
bL4
aR4
aL4
Stick (2)
Boom (1)
Bucket
Attachment
Travel (R)
Travel (Strt)
Travel (L)
Swing
Stick (1)
Boom (2)
Pilot Manifold
PG
PSA
P-IN
PAC
PEPU
C/V
JPi
Pi5
DR1
DR2
DR3
DR4
T-OUT
DR5
DR6
Pi1
Pi2
Pi3
Pi8
58
59
60
61
57
22
62
27
34 35 36 37 38 39 40 41 41
43
44 45 46 47
56
53
49
50 51 52
55
48
54
16
RENR2986-01
16 Page, (Dimensions: 34 inches x 24 inches)
THIS HYDRAULIC SCHEMATIC IS FOR THE 345B and 345B L EXCAVATORS
PART NUMBER: 115-3138
Components are shown installed on a fully operable machine.
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
A
B
C
D
E
1234567
A
B
C
D
E
1234567
B A
DR1
MU
SWING
MOTOR
PG1
MU
DR2
AB
PG2 PG3
(COOLANT)
B
STICK SWING
BOOMBUCKET
JR1JR3JR4JR2
JRT
JRP
JL2 JL4JL1JL3
JLTJLP
AL2BL2
X
DR
HL
dL5
aL5
BL4
bL4AL3BL3aL3bL2AL1BL1aL1PSW
aR1aR2AR2BR2bR3
aR4
Y
HR
AR4
R1
dSW bR2 bR1
PLPR Pp1 bL1 PAT aL2 bL3 aL4
BOOM(1)
BUCKETATCHTRAVEL(R)
PiLaR3dR4
SA5 SA4 SA3 SA2 SA1
SB5 SB4 SB3
SB2 SB1
SP
(B)
BPi
(F)(B)(R) (L)
SWING
(F)
L
L1
S
X
ST
(DOWN)(OPEN)(FWD)
(FWD)(L)(IN)
(UP)
(CLOSE) (UP) (IN,OUT,DOWN)
dR5
(BACK)
(BACK)(R)
AR3
R1
S
R2
X1
X2
M3
X3
A1
M1
A2
M2
R1
A3
T1
RIGHT
L'L'
(OUT)
BR3
R2
B' A'
BR
R3
BR
MB
MA
MB
A'B'
T1
LEFT
APi2
A'
PP2
Pi8
PSA
PG
B'
STICK(1)
STICK(2)
BOOM(2)
TRAVEL(L)
TOUTDR1DR2DR3
B
A
DR4
DR5DR6
(SLOW)
Pi3
(TRAVEL) (SWING)
PINPEU
(PUMP)
Pi1Pi2C/VJPiPi5
(RELIEF)
T2
PTA
X
T2
MA
(OIL)
TT TP
PAC
TLA1
BDr
TLA2 TRA2
TRA1
B
PSL
A
X
APi
ADr
AL4
STICK
CYLINDER
BUCKET
CYLINDER
TRACK MOTORS
BOOM
CYLINDERS
(L) TRAVEL (R)
MAIN CONNNECTOR LINE
PILOT LINE
DRAIN LINE
10
AR1
BR1
SWING
MOTOR
9
8
7
12
14
15
11
4
5
6
2
3
1
13
17
20
21
25
24
26
29
30
28
27
23
22
18
33
32
19
16
24 26
17
23
1
10
31
20
13
11
2
18
21227286
33
19
30
25
16151412
5 8 27 3 4
32
29
9
31
COMPONENT LIST
Item
No.
Description
Item
No.
Description
1 Stick Cylinder 32 Main Hydraulic Pump Group
2 Swing Motor (Left) 33 Sensor Assembly
3 Pressure Control Valve (Swing) 34 Control Valve- Stick (2)
4 Swing Motor (Right) 35 Control Valve- Boom (1)
5 Travel Motor (Left) 36 Control Valve- Bucket
6 Travel Brake Valve (Left) 37 Control Valve-Attachment
7 Travel Motor (Right) 38 Control Valve- Travel ®
8 Travel Brake Valve (Right) 39 Control Valve- Travel (L)
9 Bucket Cylinder 40 Control Valve- Swing
10 Boom Cylinder 41 Control Valve- Stick (1)
11 Swivel 42 Control Valve- Boom (2)
12 Pressure Switch (Boom Raise) 43 Line Relief Valve- Stick
13 Pilot Control Valve (Travel) 44 Drift Reduction Valve- Stick
14 Pressure Switch (Implement Swing) 45 Line Relief Valve- Bucket (Close)
15 Pressure Switch (Travel) 46 Relief Valve- Main
16 Main Control Valve 47 Drift Reduction Valve- Boom
17 Pilot Control Valve (Swing/Stick) 48 Unload Valve- Stick
18 Pilot Filter 49 Relief Valve- Stick (2) Neg. Flow Control
19 Cooling Pump 50 Line Relief Valve- Boom (1)
20 Hydraulic Activation Control Valve 51 Line Relief Valve- Bucket (Open)
21 Drain Filter 52 Line Relief Valve- Stick (1)
22 Accumulator 53 Relief Valve-Boom (2) Neg. Flow Control
23 Pilot Control Valve (Boom/Bucket) 54 Regeneration Valve- Stick
24 Slow Return Check Valve 55 Pressure Control Valve
25 Bypass Check Valve 56 Control Valve- Travel (Straight)
26 Return Filter 57 Relief Valve- Pilot Pressure
27 Pilot Valve Manifold 58 Solenoid Valve- Pump
28 Cooling Pump Relief Valve 59 Solenoid Valve- Swing
29 Fan Motor Bypass Valve 60 Solenoid Valve- Travel
30 Fan Motor 61 Solenoid Valve- Fine Control
31 Hydraulic Tank 62 Check Valve
