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EC-C3
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Hydraulic System
©
2010 Caterpillar, All Rights Reserved
Printed in U.S.A.
RENR7127-03
December 2010
System 14: Combined Function / Joystick with Slide Control
345C Excavator
Hydraulic System - Attachment
TBA1-UP
ESD1-UP
WDE1-UP
TDG1-UP
TAJ1-UP
S5M1-UP
DHP1-UP
GJR1-UP
PJW1-UP
BWY1-UP
COMPONENT LOCATION
Description
Part
Number
Machine
Location
Schematic
Location
Pump Gp - Auxiliary 136-8899 1 B-3
Tee Assembly 164-5550 2 D-3
Valve Gp - Attachment Relief 239-8984 3 C-3
Valve Gp - Boom Pilot 119-5219 4 B-1
Valve Gp - Boom Pilot Solenoid 121-6303 5 B-1
Valve Gp - Check 239-9036 6 C-3
Valve Gp - Control Medium Pressure 232-4103 7 F-3
Valve Gp - Flow Control (Boom) 4I-7836 8 B-1
Valve Gp - Negative Flow Control Solenoid 171-0188 9 E-1
Valve Gp - Pilot Shuttle 185-0462 10 B-8
Valve Gp - Solenoid & Relief (E-RV1) 239-8680 11 E-4
Valve Gp - Solenoid & Relief (E-RV2) 239-8680 12 F-4
Valve Gp - Solenoid / Check 215-4890 13 E-4
Valve Gp - Solenoid / Check (E-CV1) 215-4888 14 E-3
Valve Gp - Solenoid / Check (E-CV2) 215-4888 15 F-4
Valve Gp - Solenoid / Check (E-CV3) 215-4888 16 F-4
Accumulator Gp - Pilot Manifold
164-6981
19 B-5
Block Note B 20 D-8
Cylinder Gp - Boom Note A 21 A-8
Cylinder Gp - Bucket Note A 22 B-8
Cylinder Gp - Stick Note A 23 E-7
Filter Gp - Case Drain 126-2075 24 A-5
Filter Gp - Pilot 158-8987 25 A-4
Filter Gp - Return Oil
126-2075
26 A-7
Motor Gp - Cooling Fan 242-6904 27 A-7
Motor Gp - Left Swing 225-4506 28 F-8
Motor Gp - Left Travel
232-6180
29 F-6
Motor Gp - Right Swing
225-4506
30 F-7
Motor Gp - Right Travel
232-6180
31 F-5
Pump Gp - Cooling Fan 259-0814 32 B-2
Pump GP - Drive / Idler / Pilot Hydraulic 259-0818 33 B-3
Swivel Gp
225-4547
34 E-6
Tank Gp - Hydraulic Oil
227-0431
35 A-6
Valve Gp - Boom/Swing Priority 232-4102 36 B-4
Valve Gp - Cooler Bypass Check
123-2505
37 B-7
Valve Gp - Left Fine Swing Motor 116-3420 38 E-8
Valve Gp - Left Travel / Brake 165-9338 39 E-6
Valve Gp - LH Pilot Control (Stick/Swing)
232-4157
40 C-8
Valve Gp - Main Control
230-2760
41 D-4
Valve Gp - Pilot Manifold
215-5037
42 B-6
Valve Gp - Pilot Travel
165-9522
43
D-8
Valve Gp - Power Shift Control Solenoid
225-4518
44 B-2
Valve Gp - RH Pilot Control (Bucket/Boom) 232-4158 45 C-7
Valve Gp - Right Travel / Brake
165-9338
46 E-5
Valve Gp - Slow Return Check 185-0384 47 B-8
Note A: Refer to parts manual for specific cylinder information.
Attachment: System 14: Combined Function
Standard 345C
Note B: Part numbers are located on the main Hydraulic System Schematic according to
the effectivity of the machine.
Valve Gp - Work Tool Sol. ( 4-Function) 185-0507 17
E-2
Valve Gp - Heavy Lift Solenoid 121-6303 48 B-4
Filter Gp - Case Drain 49 A-6
126-2075
TAP LOCATION
Tap
Number
Description
Schematic
Location
AA Pilot Pump Delivery Pressure A-4
BB Drive Pump Delivery Pressure B-2
GG A1 Pilot Pressure E-2
HH A2 Pilot Pressure E-2
JJ A3 Pilot Pressure E-2
KK A4 Pilot Pressure E-3
SOS Hydraulic Oil Sampling Port A-4
CC Pump Power Shift Pressure A-2
DD Idler Pump Delivery Pressure A-2
EE Idler Pump Negative Flow Signal Pressure E-1
FF Drive Pump Negative Flow Signal Pressure E-1
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
NEGATIVE FLOW / HEAVY LIFT CONTROL CIRCUITS
MEDIUM PRESSURE PUMP
POWER SHIFT CONTROL CIRCUIT
COOLING FAN PUMP
SUPPLY LINE
MEDIUM PRESSURE CONTROL CIRCUIT
STICK CYLINDER CONTROL CIRCUIT
LEFT TRAVEL MOTOR CONTROL CIRCUIT
ATTACHMENT CONTROL CIRCUIT
SWING MOTOR CONTROL CIRCUIT
DRAIN / RETURN LINE
SWING BRAKE CONTROL CIRCUIT
IDLER PUMP
TRAVEL SPEED CONTROL CIRCUIT
BUCKET CYLINDER CONTROL CIRCUIT
RIGHT TRAVEL MOTOR CONTROL CIRCUIT
BOOM CYLINDER CONTROL CIRCUIT
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: SYSTEM 14 : COMBINED FUNCTION / JOYSTICK WITH SLIDE CONTROL
PART NUMBER: 230-2704, CHANGE: 01, VERSION: HE
1
2
3
4
56
7
8
A
C
D
E
F
23
4
56
7
8
A
B
C
D
E
F
B
1
(22) CYLINDER GP
BUCKET
(21) CYLINDER GP
BOOM
(23) CYLINDER GP
STICK
BOOM(1)
STICK(2)
BUCKET
ATCH
TRAVEL(R)
TRAVEL(L)
SWING
STICK(1)
BOOM(2)
TRAVEL(R)TRAVEL(L)
SWINGSTICK BOOMBUCKET
OUT IN R L OPEN CLOSE DOWN UP
HL
aL5
Dr
R2
X
Pp1
R1
Y
HR
AR4
R3
Pi1P2 P-IN
PSA2 DR1
T-OUT2
DR2
DR3
DR4
Pi2
DR5
DR6
T-OUT1
P1 P2
T
B1
A1
B2
A2
A4
B1
Dr1
Di
PS2
PB
Pi2
D0
PS1
Pi1
a2
a5
a3
A2
a1
a4
A1
PSV
P1
PG2
PB2
DE2
B2
A2
PA2
M2
DB2
PG1
PB1
DE1
B1
A1
PA1
M1
DB1
BA
X
BA
B
A
AG
AG
BG
BG
T2
T2
T1
T1
BR
BR
dL5
(DOWN)
BPi
BDr
(UP)
(CLOSE)
AL2
BL2
PAT
(OPEN)
bL2
(F)(B)
PTAPSW
(BACK)
(FWD)
dST1
(BACK)
(F)
(B)
(R)
(FWD)
(L)
(R) (L)
dSW
PiL
(IN)
(OUT)
APi
ADr
(UP)
APi2
dR5
PSA1
X
(IN)
Pp2
PC
PG
T
OUT
IN
TP
TT
BACK FWD FWD
T2T1
T3
T4
BACK
JLP
JLT
JL1 JL3 JL2 JL4 JR4 JR2 JR3 JR1
JRP
JRT
PiH
A1
B1
A2
B2
A3
B3
A4
B4
A5
B5
A6
B6
A7
B7
A8
B8
DOUBLE
SINGLE
DOUBLE
SINGLE
P
T
A1
A2
B1
B2
DR
DR
DR
P
T
A
B
M
LS
A
B
P
T
A
CA
CD
CB1
CB2
(2) TEE AS.
164-5550
B
A
A
B
PB
PA
A
B
DR
B
A
8
1
7
6
2
4
L
B
A
A
B
L
P
T
A
S
L1
L
B
X
5
(OUT)
BR3 AR3
AR2 BR2
AL3BL3
BL4 AL4
AR1BR1 AL1 BL1
bR1 aR1
aL1
bL1
aR3 bR2 bR3 aR2aR4 bL3 bL4 aL3
AR3
BR3
aR3
BR2 AR2
bR2
BR1
AR1
bR1
bL1
BL1
AL1
bL3
BL3
AL3
BL4
AL4
bR3 aR2 aR1
PR
PL
aL1 aL3 bL4
PR
PL
T
P
A1
B1
A2
B2
A3
B3
A4
B4
aL2
bL2
aL2
bL2
aR4
dR4
aL4
aL4
NO.1
(TRAVEL)
NO.2
(SWING)
NO.3
(LOCK)
dR4
DR
DR1
L2
L3
A
B
(4) VALVE GP
BOOM PILOT
119-5219
(8) VALVE GP
FLOW CONTROL
BOOM
4I-7836
(5) VALVE GP
BOOM PILOT
SOLENOID
121-6303
(10) VALVE GP
PILOT
SHUTTLE
185-0462
(13) VALVE GP
SOLENOID/CHECK
215-4890
(17) VALVE GP
WORK TOOL SOL
4-FUNCTION
185-0507
(41) VALVE GP
MAIN CONTROL
230-2760
(31) MOTOR GP
RIGHT TRAVEL
232-6180
(39) VALVE GP
LEFT TRAVEL/BRAKE
165-9338
(46) VALVE GP
RIGHT
TRAVEL/BRAKE
165-9338
(34) SWIVEL GP
225-4547
(29) MOTOR GP
LEFT TRAVEL
232-6180
(28) MOTOR GP
LEFT SWING
225-4506
(38) VALVE GP
LEFT FINE
SWING MOTOR
116-3420
(30) MOTOR GP
RIGHT SWING
225-4506
(43) VALVE GP
PILOT TRAVEL
165-9522
(20) BLOCK
(40) VALVE GP
LH PILOT CONTROL
STICK/SWING
232-4157
(45) VALVE GP
RH PILOT
CONTROL
BUCKET/BOOM
232-4158
(27) MOTOR GP
COOLING FAN
242-6904
(47) VALVE GP
SLOW RETURN
CHECK
185-0384
(37) VALVE GP
COOLER
BYPASS
CHECK
123-2505
(24) FILTER GP
CASE DRAIN
126-2075
(36) VALVE GP
BOOM/SWING
PRIORITY
232-4102
(25) FILTER GP
PILOT
158-8987
(48) VALVE GP
HEAVY LIFT
SOLENOID
121-6303
FINE
SWING
(33) PUMP GP
DRIVE/IDLER/
PILOT HYDRAULIC
259-0818
(44) VALVE GP
POWER SHIFT
CONTROL
SOLENOID
225-4518
(32) PUMP GP
COOLING FAN
259-0814
DRIVE
IDLER
PILOT
EE
FF
BB
CC
DD
HH
JJ
GG
KK
SOS
AA
(6) VALVE GP
CHECK
239-9036
(3) VALVE GP
ATTCH RELIEF
239-8984
(16) VALVE GP
SOLENOID/CHECK
(E-CV3)
215-4888
(26) FILTER GP
RETURN OIL
126-2075
(35) TANK GP
HYDRAULIC OIL
227-0431
(49) FILTER GP
CASE DRAIN
126-2075
(42) VALVE GP
PILOT MANIFOLD
215-5037
(19) ACCUMULATOR GP
PILOT MANIFOLD
164-6981
(1) PUMP GP
AUXILLIARY
136-8899
(9) VALVE GP
NEGATIVE FLOW
CONTROL SOLENOID
171-0188
(7) VALVE GP
CONTROL
MEDIUM
PRESSURE
232-4103
(12) VALVE GP
SOLENOID AND
RELIEF
(E-RV2)
239-8680
(11) VALVE GP
SOLENOID AND
RELIEF (E-RV1)
239-8680
(15) VALVE GP
SOLENOID/CHECK
(E-CV2)
215-4888
(14) VALVE GP
SOLENOID/
CHECK (E-CV1)
215-4888
NEGATIVE FLOW CONTROL
12
EE
FF
VIEW ALL CALLOUTS
PUMP AND FILTER GROUP
44
33
25
SOS
DD
CC
BB
AA
VIEW ALL CALLOUTS
WORK TOOL SOLENOIDS
17
GG
HH
JJ
KK
1
VIEW ALL CALLOUTS

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