FLUID POWER SYMBOLS
Component Locations
15
BASIC COMPONENT SYMBOLS MAIN AUX.
PUMP or MOTOR
aL5
aL4
bL3
aL2
bL1
bR1
bR2
aR3
aR4
Bpi
Api
BDr
ADr
LINE RESTRICTION (FIXED)
RESTRICTION
PRESSURE COMPENSATION
LINE RESTRICTION (VARIABLE)
SPRING (ADJUSTABLE)
VARIABILITY
CONTROL VALVES
SPRING
FLUID CONDITIONER
PUMP: VARIABLE and PRESSURE COMPENSATED
2-SECTION PUMP
HYDRAULIC PNEUMATIC ENERGY TRIANGLES
ATTACHMENT
LINE RESTRICTION VARIABLE and PRESSURE COMPENSATED
VALVES VALVE ENVELOPES
Pp1 Pp1
Pp2
VALVE PORTS
Pp2
PTA TWO POSITION
ONE POSITION
A
A
PSW
AL4 BL3
BL2
AR3
BL1
BR1
TWO-WAY
THREE POSITION
CONTROL VALVES
BR2
AR4
FOUR-WAY
THREE-WAY
CHECK VALVES
AB
AB
X dsW
BL4 dL5
AL3
AL2
AL1
AR1
AR2
PiL
P T SHIFTED POSITION
P T NORMAL POSITION
BR3
INFINITE POSITION
SHUTTLE
SPRING LOADED
BASIC SYMBOL
MEASUREMENT
PILOT CONTROLLED
ROTATING SHAFTS
dR5 APi2 HR
PRESSURE
FLOW
TEMPERATURE
UNIDIRECTIONAL
BIDIRECTIONAL
PL
HL
B
C
STICK (2) BOOM
PR
BUCKET
TRAVEL (R) ATT
STR TRAVEL SWING TRAVEL (L)
VIEW A-A
345C Excavator Hydraulic System
PAT
Dr
R3 TANK R1 bL4
aL3
bL2
aL1
dST1
aR1
aR2
R2
aR3
dR4
VIEW B
FLUID STORAGE RESERVOIRS
BOOM (2) STICK
VIEW C
VENTED
Main Control Valve
RETURN BELOW FLUID LEVEL
COMBINATION CONTROLS
KBA1-UP TBA1-UP MDC1-UP WDE1-UP GBH1-UP RFN1-UP DHP1-UP GJR1-UP JAR1-UP PJW1-UP BWY1-UP CPX1-UP
SOLENOID or MANUAL
SOLENOID
SERVO
SOLENOID and PILOT or MANUAL
SOLENOID and PILOT
DETENT
THERMAL
MANUAL CONTROL SYMBOLS
PUSH-PULL LEVER
GENERAL MANUAL
MANUAL SHUTOFF
PUSH BUTTON
PEDAL
SPRING
PILOT CONTROL SYMBOLS RELEASED PRESSURE
EXTERNAL RETURN
REMOTE SUPPLY PRESSURE
INTERNAL RETURN
SIMPLIFIED
CROSSING AND JOINING LINES
ACCUMULATORS
SPRING LOADED
GAS CHARGED
LINES CROSSING
HYDRAULIC PUMPS FIXED DISPLACEMENT
Note A: See the Parts manual for specific cylinder part number.
RETURN ABOVE FLUID LEVEL
PRESSURIZED
LINES JOINING
HYDRAULIC AND PNEUMATIC CYLINDERS
SINGLE ACTING
FIXED DISPLACEMENT
VARIABLE DISPLACEMENT NON-COMPENSATED
UNIDIRECTIONAL
UNIDIRECTIONAL
BIDIRECTIONAL
BIDIRECTIONAL
DOUBLE ACTING
INTERNAL PASSAGEWAYS
HYDRAULIC MOTORS
VARIABLE DISPLACEMENT NON-COMPENSATED
INTERNAL SUPPLY PRESSURE
COMPLETE
FLOW IN ONE DIRECTION
PARALLEL FLOW
CROSS FLOW
Printed in U.S.A.
Electrical Symbols Table
7
Hydraulic Symbols (Electrical)
G Transducer (Fluid) Pi 2 DR6 T-OUT1
DR4
Transducer (Gas / Air)
Generator
Electric Motor
DR3
Pressure Switch (Adjustable)
8
Electrical Wire
Temperature Switch
Electrical Symbols (Electrical)
9
T
Pressure Symbol
11 12 13 14
M
DR5
Pressure Switch
20 21 22
Temperature Symbol
Flow Symbol
Level Symbol
PAC
43
Wire Number Identification Codes
23
Electrical Schematic Example
Hydraulic Schematic Example Current Standard
Current Standard LOCK
SWING
Harness identification code This example indicates wire 135 in harness "AG".
TRAVEL
10
Wire Circuit Number Identification
Wire Color
325-AG135 PK-14 325-PK Circuit Identification Number
DR1
25 26 32 28 29 33 30 36 38
Pi 1
PSA2 DR2
Wire Color
T-OUT2 PSA1
Wire Gauge
Previous Standard Wire Color
Wire
P2 P-IN
325-PK-14 B Circuit Number Identification
Pilot Manifold Control Valve
3 5
39 41 42 44
FLOW ALLOWED IN EITHER DIRECTION
Without Heavy Lift and Fine Swing © 2005 Caterpillar All Rights Reserved
17 18 19
TWO POSITION
THREE POSITION
INFINITE POSITIONING
4 6
1 2
Machine Component Locations
A
Wire Gauge (EXAMPLE VALVE)
30 Page, DGM
Accumulator Gp - Pilot Manifold Cooler Gp - Oil Cylinder Gp - Boom Cylinder Gp - Bucket Cylinder Gp - Stick Filter Gp - Return (Inside Hydraulic Tank) Filter Gp - Drain Return Filter Gp - Pilot Motor Gp - Cooling Fan Motor Gp - Left Swing Motor Gp - Left Travel Motor Gp - Right Swing Motor Gp - Right Travel Pump Gp - Cooling Pump Gp - Drive / Idler / Pilot Sensor Gp - Drive Pump Pressure Sensor Gp - Idler Pump Pressure Switch As - Implement Pressure Switch As - Travel Pressure Swivel Gp - Joint Tank Gp - Hydraulic Valve Gp - Boom / Swing Priority Valve Gp - Boom Drift Reduction Valve Gp - Check Boom / Stick 2 Valve Gp - Check Boom 2 Valve Gp - Check Cooler Bypass Valve Gp - Check Slow Return Valve Gp - Check Stick Valve Gp - Left Swing Motor Valve Gp - Left Travel / Brake Valve Gp - Lock Solenoid Valve Gp - Main Control Valve Gp - Pilot Control Bucket / Boom Valve Gp - Pilot Control Stick / Swing Valve Gp - Pilot Control Travel Valve Gp - Pilot Manifold Valve Gp - Power Shift Control Valve Gp - Right Travel / Brake Valve Gp - Stick Drift Reduction Valve Gp - Swing Brake Solenoid Valve Gp - Travel Speed Solenoid
11
RENR7356-01 February 2005
RENR7356-01
Description
Part Machine Schematic Number Location Location 164-6981 B-6 29 210-8164 B-8 22 Note A E-1 9 Note A E-2 8 Note A E-8 7 173-3434 A-5 and A-6 42 126-2075 A-4 and A-6 41 and 44 158-8987 A-4 39 242-6904 A-6 23 225-4506 F-7 1 232-6180 F-5 3 225-4506 F-6 2 232-6180 F-4 4 259-0814 B-1 32 259-0818 A-3 33 221-8869 B-2 36 221-8869 A-2 38 106-1079 D-3 13 106-1079 D-3 14 225-4547 E-5 10 227-0431 A-6 43 232-4102 B-4 31 153-5233 D-1 15 239-8902 D-1 12 239-8906 D-6 12 123-2505 B-8 21 185-0384 B-8 20 239-8904 D-5 12 107-7056 E-7 1 165-9338 E-5 5 121-1491 B-5 28 230-2760 D-1 12 232-4158 C-7 19 232-4157 C-8 18 165-9522 D-8 17 215-5037 B-6 30 225-4518 B-2 33 165-9338 E-4 6 153-5233 D-5 11 121-1491 B-6 26 121-1491 B-6 25
8
7
6 MOTOR GP RIGHT SWING 225-4506
SWING MOTOR
4
5 TRAVEL MOTOR (LEFT)
DB1
LINE PATTERNS
MOTOR GP RIGHT TRAVEL 232-6180
DB2 X
X
F
M2
M1 PA1
T1
T1 PB2
PB1
DRIVE PUMP OUTPUT PILOT PUMP OUTPUT HYDRAULIC OIL COOLING PUMP OUTPUT IDLER PUMP OUTPUT
TRAVEL MOTOR (RIGHT)
MOTOR GP LEFT TRAVEL 232-6180
PG2
1 LINES GROUP COLOR DESCRIPTIONS
SWING MOTOR
PG1
2
3
PA2
TRAVEL SPEED CONTROL CIRCUIT
Pilot / Load Sensing Pressure
SUPPLY LINE DRAIN / RETURN LINE
Drain / Return Lines
POWER SHIFT CONTROL CIRCUIT ATTACHMENT CONTROL CIRCUIT
Component Group
HEAVY LIFT CONTROL CIRCUIT RIGHT TRAVEL CONTROL & RIGHT TRAVEL MOTOR CIRCUIT LEFT TRAVEL CONTROL & LEFT TRAVEL MOTOR CIRCUIT
Attachment
SWING CONTROL & SWING MOTOR CIRCUIT
Air Line
BOOM CONTROL & BOOM CYLINDER CIRCUIT BUCKET CONTROL & BUCKET CYLINDER CIRCUIT
F
STICK CONTROL & STICK CYLINDER CIRCUIT SWING BRAKE CONTROL CIRCUIT
T2
T2
L
Pressure Line
VALVE GP RIGHT TRAVEL/BRAKE 165-9338
L
BR
BR
DE1 B1
A1
STICK CYLINDER
MOTOR GP LEFT SWING 225-4506
A2
B2
DE2
AG
BR3
AR3
AG
VALVE GP LEFT TRAVEL/BRAKE 165-9338
VALVE GP LEFT SWING MOTOR 116-3420
A
B
A
BG
BG
B
B
BR2
BR1
AR1
BOOM CYLINDER
BOOM CYLINDER
BUCKET CYLINDER
SWIVEL GP JOINT 225-4547
E AR2
A
E
AL1
BL1
VALVE GP CHECK BOOM/STICK(2) 239-8902 VALVE GP PILOT CONTROL TRAVEL 165-9522
VALVE GP CHECK BOOM(2) 239-8906
TP TT
TRAVEL(L)
TRAVEL(R)
BR3
aR4 MU2
-µ
-µ
-µ
FWD
T1
FWD
T2
A
A
BR1
AR2 MU1
(R)
SWITCH AS. TRAVEL PRESS 106-0179
bR1
(L)
(B)
(OUT)
(F)
(R)
bL1 bL3
BL1
SWITCH AS. IMPLEMENT PRESSURE 106-0179
AR1
MU2
CV
CV
bR2 BR2
aR3
ADr APi
(UP)
D
BACK
AR3
MU1
-µ
VALVE GP CHECK STICK 239-8904
AL1 PSW
PTA
(BACK)
(B)
(F)
CV2 A PAT aL2
BL2
(BACK)
AL2
(UP)
(CLOSE)
MU
BDr
aL4
aL5
VALVE GP MAIN CNTRL D 230-2760
BPi
VALVE GP BOOM DRIFT REDUCTON 153-5233
BACK
T3
T4 Dr
bR1
aR1
aL1
VALVE GP STICK DRIFT REDUCTON 153-5233
bL1
HL
AR4
R2
R3
C JLP JLT
VALVE GP PILOT CONTROL STICK/SWING 232-4157 SWING
STICK
-µ
OUT
IN
JL1
JL3
L
R JL2
R1
BOOM(2) dR4
APi2
STICK (IN)
dR5
PiL
SWING (L)
dSW
TRAVEL(L) (FWD) dST1 PiH
JRT BOOM -µ
OPEN
JL4
C
JRP
BUCKET
-µ
-µ
-µ
Y
VALVE GP PILOT CONTROL BUCKET/BOOM 232-4158
-µ
CLOSE
aR2
TRAVEL(R) (FWD)
ATCH bL2
BUCKET (OPEN)
BOOM (DOWN)
STICK(2) dL5 (IN,OUT)
Pp1 aL1
aR1
aL3
bL4
PL
-µ
UP
DOWN JR3
JR2
JR4
Pp2 PR
bR3
JR1 Pi1
A3
A4
A5
A6
A7
P2 B
B1 aR4
VALVE GP CHECK SLOW RETURN 185-0384
B2
B3
bL3
bL4
B4
B5
aL3
B6 aR3
B7 bR2
DR1 DR
B8 bR3
aR2
DR1
VALVE GP SWING BRAKE SOL 121-1491
B1
PSA1
A1
B2
A2
VALVE GP LOCK SOL 121-1491
T-OUT2 DR2
Pi2
DR5
P1
B
8 DRIVE
1
VALVE GP POWER SHIFT CONTROL 225-4518
PILOT IDLER
7
PSV
a3
6
T-OUT1 DR6
S
L1
L
a5 a2
Di PS2 PB
PR
SENSOR GP PUMP DRIVEN PRESSURE 221-8869
FILTER GP DRAIN RETURN 126-2075
MOTOR GP COOLING FAN 242-6904
A2
IN
OUT
FILTER GP RETURN 173-3434
A
T PG
TANK GP HYDRAULIC 227-0431
8
a1
T
P2
A4 B1 Dr1
A
PS1
A1 a4
L2
FILTER GP RETURN 173-3434
B
B
FILTER GP PILOT 158-8987 DR4
PUMP GP COOLING 259-0814
X
PL D0
P1
FILTER GP DRAIN RETURN 126-2075 A
PSA2
ACCUMULATOR GP PILOT MANIFOLD 164-6981
DR3 L3
P-IN
VALVE GP TRAVEL SPEED SOL 121-1491
VALVE GP PILOT MANIFOLD 215-5037
VALVE GP CHECK COOLER BYPASS 123-2505
Pi1
SENSOR GP PUMP DRIVE PRESSURE 221-8869
PUMP GP DRIVE/IDLER & PILOT 259-0818
VALVE GP BOOM/SWING PRIORITY 232-4102
A8
NO.3 (LOCK)
A2
NO.2 (SWING)
A1
NO.1 (TRAVEL)
30 Page, Color 2, DGM
X
-µ
RENR7356-01
HR
7
6
THIS SCHEMATIC IS FOR THE 345C
Pi2
PC
Part #: 230-2696 HE 05 Components are shown installed on a fully operable machine with the key and engine off and transmission shifter in neutral.
5
4
3
2
1