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CAT 345C Excavator Hydraulic System Attachment Quick Coupler

INTERACTIVE SCHEMATIC
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Cover Page
Information
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Tap Table
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X
EC-C3
EC-C2
E-C60
EC-C1
E-C61
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©
2010 Caterpillar, All Rights Reserved
Printed in U.S.A.
Quick Coupler
RENR7074-02
December 2010
TBA1-UP
ESD1-UP
WDE1-UP
TDG1-UP
TAJ1-UP
S5M1-UP
DHP1-UP
GJR1-UP
PJW1-UP
BWY1-UP
345C Excavator
Hydraulic System - Attachment
COMPONENT LOCATION
Description
Part
Number
Machine
Location
Schematic
Location
Valve Gp - Solenoid and Manifold (Quick
Coupler)
260-3877 2
F-2
Valve - Check (Quick Coupler) 123-4750 1 D-1
Attachment
Accumulator Gp - Pilot Manifold Note B 19 B-5
Cylinder Gp - Boom Note A 21 F-3
Cylinder Gp - Bucket Note A 22 E-8
Cylinder Gp - Stick Note B 23 F-8
Filter Gp - Case Drain Note B 24 A-5
Filter Gp - Pilot Note B 25 A-4
Filter Gp - Return Oil Note B 26 A-7
Motor Gp - Cooling Fan Note B 27 A-8
Motor Gp - Left Travel Note B 28 F-5
Motor Gp - Right Swing Note B 29 F-6
Motor Gp - Right Travel Note B 30 F-4
Motor Gp - Swing Left Note B 31 F-7
Pump Gp - Cooling Fan Note B 32 B-2
Pump GP - Drive / Idler / Pilot Hydraulic Note B 33 B-3
Swivel Gp Note B 34 E-5
Tank Gp - Hydraulic Oil Note B 35 A-6
Valve Gp - Boom/Swing Priority Note B 36 B-4
Valve Gp - Cooler Bypass Check Note B 37 B-8
Valve Gp - Left Swing Motor Note B 38 E-7
Valve Gp - Left Travel / Brake Note B 39 E-5
Valve Gp - LH Pilot Control (Stick/Swing) Note B 40 C-8
Valve Gp - Main Control Note B 41
D-4
Valve Gp - Pilot Manifold Note B 42
B-5
Valve Gp - Pilot Travel Note B 43
D-8
Valve Gp - RH Pilot Control (Bucket/Boom) Note B 44 C-7
Valve Gp - Right Travel / Brake Note B 45 E-4
Valve Gp - Slow Return Check Note B 46 B-8
Note A: Refer to parts manual for specific cylinder information.
Standard 345C
Note B: Part numbers are located on the main Hydraulic System Schematic according to
the effectivity of the machine.
Valve Gp - Power Shift Control Note B 47
B-3
Filter Gp - Case Drain Note B 48 A-6
TAP LOCATION
Tap
Number
Description
Schematic
Location
AA Pilot Pump Delivery Pressure A-4
BB Drive Pump Delivery Pressure B-2
CC Pump Power Shift Pressure A-3
DD Idler Pump Delivery Pressure A-3
SOS Hydraulic Oil Sampling Port A-4
FLUID POWER SYMBOLS
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
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 ACTINGSINGLE 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
ELECTRICAL SYMBOLS
Hydraulic Symbols (Electrical)
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)
T
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Attachment
Air Line
CALLOUTS
Taps (Pressure, Sampling, Sensor - by letter)
YY
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
PILOT PUMP OUTPUT
DRIVE PUMP OUTPUT
POWER SHIFT CONTROL CIRCUIT
SUPPLY LINE
STICK CYLINDER CONTROL CIRCUIT
LEFT TRAVEL MOTOR CONTROL CIRCUIT
ATTACHMENT CONTROL CIRCUIT
SWING MOTOR CONTROL CIRCUIT
DRAIN / RETURN LINE
SWING BRAKES
IDLER PUMP
TRAVEL SPEED CONTROL CIRCUIT
BUCKET CYLINDER CONTROL CIRCUIT
RIGHT TRAVEL MOTOR CONTROL CIRCUIT
BOOM CYLINDER CONTROL CIRCUIT
COOLING FAN PUMP
Components are shown installed on a fully operable machine with the key and engine off,
and with parking brake set.
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
THIS SCHEMATIC IS FOR THE 345C EXCAVATOR
ATTACHMENT: QUICK COUPLER
PART NUMBER: 282-5688, CHANGE: 02, VERSION: HE
1
2
3
4
56
7
8
C
D
E
F
23
4
56
7
8
A
B
C
D
E
F
B
1
FWD
A2
CV
BOOM(1) STICK(2)BUCKETATCH
HL
aL5
Dr
R2
X
dL5(DOWN)
BPiBDr
(UP)(CLOSE)
AL2BL2
aL2PAT
(OPEN)bL2
(F)
aL4
(IN)
CV1
CV2
A
MU
(OUT)
BL1
AL1
bL3
BL3 AL3 BL4
AL4
aL3
bL4
TRAVEL(R)
TRAVEL(L)SWINGSTICK(1)
Pp1
(B)
PTAPSW
(BACK)
(FWD)
dST1
(BACK)(F)(B)(R)
(FWD)
(L)
(R) (L)
dSWPiL(IN)
(OUT)
Pp2
PiH
MU1
aR3
BR2
AR2
bR2
BR1
AR1
bR1
bL1
bR3 aR2
aR1
PR
PL aL1
BOOM(2)
R1
Y
HR
AR4
R3
dR4
(UP)
APi2 dR5
A A
MU2 MU2
MU1
CV
AR3BR3aR4
B
S
Pi1
a2
a5
a3
A2
a1
a4
A1
PSV
3
LL1
X
PR
PL
P1 P2
T
B1
A1
B2 A2
A4
B1 Dr1 Di PS2 PB
Pi2
D0 PS1
PC
PG
T
IN
8
1
7
6
5
Pi1 P-IN PSA2 DR1
T-OUT2 DR2
DR4
Pi2 DR5
DR6T-OUT1
PSA1
OUT
NO.1
(TRAVEL)
NO.2
(SWING)
NO.3
(LOCK)
P2
DR3
P1
8 7
A1
B1
A2
B2
A3
B3
A4
B4
A5
B5
A6
B6
A7
B7
A8
B8
aR3 bR3bR2 aR2aL3bL3 bL4aR4
DR
DR1
L2
L3
B
SWINGSTICK BOOMBUCKET
OUT IN R L OPEN CLOSE DOWN UP
JLP
JL1 JL3 JL2 JL4 JR4 JR2 JR3 JR1
JRP
JRTJLT
TRAVEL(R)TRAVEL(L)
TP
TT
BACK FWD
T2T1 T3 T4
BACK
bR1 aR1 aL1 bL1
(22) CYLINDER GP
BUCKET
(23) CYLINDER GP
STICK
PG2
PA2
M2
DB2
PG1
PB1
PA1
M1
DB1
B
A
BR3 AR3
AR2 BR2
AL3BL3
DE1
A1
PB2
DE2
B2
BA
AG
BR1
(34) SWIVEL GP
X
B
A
BG
BG
T2
T2
T1
T1
BR
X
B
A
L
AR1 AL1 BL1
BR
L
B
AG
A
(21) CYLINDER GP
BOOM
BL4 AL4
(2) VALVE GP
260-3877
P
T
C1 C2
UNLOCK
LOCK
(1) VALVE
CHECK
123-4750
BB
CC
DD
SOS
AA
APiADr
SOLENOID AND MANIFOLD
(QUICK COUPLER)
(QUICK COUPLER)
(31) MOTOR GP
(38) VALVE GP
LEFT SWING MOTOR
(29) MOTOR GP
RIGHT SWING
(43) VALVE GP
PILOT CONTROL
TRAVEL
LEFT SWING
(30) MOTOR GP
RIGHT TRAVEL
(45) VALVE GP
RIGHT
TRAVEL/BRAKE
(19) ACCUMULATOR GP
PILOT MANIFOLD
(36) VALVE GP
BOOM/SWING
PRIORITY
(25) FILTER GP
PILOT
(32) PUMP GP
COOLING FAN
(47) VALVE GP
POWER SHIFT
CONTROL
(33) PUMP GP
DRIVE/IDLER/
PILOT HYDRAULIC
(41) VALVE GP
MAIN CONTROL
(26) FILTER GP
RETURN OIL
(35) TANK GP
HYDRAULIC OIL
(48) FILTER GP
CASE DRAIN
(42) VALVE
GP
PILOT
MANIFOLD
(24) FILTER GP
CASE DRAIN
(27) MOTOR GP
COOLING FAN
(46) VALVE GP
CHECK
SLOW RETURN
(37) VALVE GP
CHECK
COOLER BYPASS
(40) VALVE GP
LH PILOT CONTROL
STICK/SWING
(44) VALVE GP
RH PILOT
CONTROL
BUCKET/BOOM
(28) MOTOR GP
LEFT TRAVEL
(39) VALVE GP
LEFT
TRAVEL/BRAKE
A
B1
MAIN CONTROL VALVE
HL
APi2
HR
Dr
PAT
A A
C B
VIEW B VIEW C
AL4
BL4 AL3 AL2 AL1 AR1
BL3 BL2 BL1
PTA
PSW
X
BR2
AR4
AR3
BR3
BR1
AR2
R3
R1
aL5 aL4 bL3 aL2 bL1
bR1 bR2 aR3
aR4
Pp2Pp1
dL5
dR5
PL
PR
bL4 aL3 bL2 aL1 dST1 aR1 aR2 aR3
Bpi
BDr
Pp2Pp1
Api
ADr
dsW PiL
R2
TANK
dR4
STICK (2)
BOOM (1)
BUCKET
ATT
TRAVEL (R) STR TRAVEL
TRAVEL (L)
SWING
STICK (1)
BOOM (2)
PILOT OIL MANIFOLD
DR2
T-OUT2
DR1
PSA1
PSA2
P-IN
Pi 1
P2
LOCK
SWING
TRAVEL
PUMP AND FILTER GROUP
44
33
25
SOS
DD
CC
BB
AA
VIEW ALL CALLOUTS

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