INTERACTIVE SCHEMATIC
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Information
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X
EC-C3
EC-C2
E-C60
EC-C1
E-C61
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Hydraulic Attachment
345C Excavator
TBA1-UP
FPC1-UP
ESD1-UP
WDE1-UP
TDG1-UP
TAJ1-UP
DHP1-UP
GJR1-UP
PJW1-UP
BWY1-UP
©
2006 Caterpillar, All Rights Reserved
Printed in U.S.A.
RENR7130-01
October 2006
Counterweight Removal
COMPONENT LOCATION
Description
Part
Number
Machine
Location
Schematic
Location
Valve As - Manual Counterweight 4I-6188 3 E-2
Valve Gp - Check (Pilot Operated) 087-5087 1 E-1
Valve Gp - Counterweight Control Solenoid 123-2514 2 C-1
Valve Gp - Manual Counterweight Control 123-2515 4 D-1
Accumulator Gp - Pilot Manifold 164-6981 19 B-5
Cylinder Gp - Boom Note A 21 F-2
Cylinder Gp - Bucket Note A 22 F-3
Cylinder Gp - Stick Note A 23 E-8
Filter Gp - Return 173-3434 24 A-6
Filter Gp - Pilot 158-8987 25 A-4
Filter Gp - Drain Return 126-2075 26 A-7
Motor Gp - Cooling Fan 266-8034 27 A-8
Motor Gp - Left Travel 232-6180 28 F-5
Motor Gp - Right Swing 255-4506 29 F-6
Motor Gp - Right Travel 232-6180 30 F-4
Motor Gp - Swing Left 225-4506 31 F-7
Pump Gp - Cooling Fan 259-0814 32 B-2
Pump Gp - Drive / Idler / Pilot Hydraulic 221-8869 33 B-3
Swivel Gp 225-4547 34 E-5
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-8
Valve Gp - Left Swing Motor 107-7056 38 E-7
Valve Gp - Left Travel / Brake 266-7843 39 E-5
Valve Gp - LH Pilot Control (Stick/Swing) 232-4157 40 C-8
Valve Gp - Main Control 259-7774 41 D-4
Valve Gp - Pilot Manifold 215-5037 42 A-5
Valve Gp - Pilot Travel 165-9522 43 D-8
Valve Gp - RH Pilot Control (Bucket/ Boom) 232-4158 44 C-7
Valve Gp - Right Travel / Brake 266-7843 45 E-4
Valve Gp - Slow Return Check 185-0384 46 B-8
Note A: Refer to parts manual for specific cylinder information.
Attachment
Standard 345C
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-2
DD Idler Pump Delivery Pressure A-2
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
DRAIN / RETURN LINE
HYDRAUL I C CI RCUI T COL OR DE S CRI PT I ONS
DRIVE PUMP OUTPUT
IDLER PUMP
POWER SHIFT CONTROL CIRCUIT
PILOT PUMP OUTPUT
COOLING FAN PUMP
ATTACHMENT CONTROL CIRCUIT
SUPPLY LINE
BUCKET CONTROL & BUCKET CYLINDER CIRCUIT
RIGHT TRAVEL CONTROL & RIGHT TRAVEL MOTOR CIRCUIT
TRAVEL SPEED CONTROL CIRCUIT
STICK CONTROL & STICK CYLINDER CIRCUIT
BOOM CONTROL & BOOM CYLINDER CIRCUIT
NEGATIVE FLOW CONTROL
LEFT TRAVEL CONTROL & LEFT TRAVEL MOTOR CIRCUIT
SWING CONTROL & SWING MOTOR CIRCUIT
SWING BRAKE CONTROL CIRCUIT
P1 P2
T
B1
A1
B2 A2
A4
B1 Dr1 Di PS2 PB
Pi2
B
S
D0 PS1
Pi1
a2
a5
a3
A2
a1
a4
A1
PSV
PC
PG
IN
8
1
7
6
LL1
X
5
PR
PL
Pi1P2 P-IN PSA2 DR1
T-OUT2 DR2
DR3
DR4
Pi2 DR5
DR6T-OUT1
P1
PSA1
T
OUT
NO.1
(TRAVEL)
NO.2
(SWING)
NO.3
(LOCK)
A1
B1
A2
B2
A3
B3
A4
B4
A5
B5
A6
B6
A7
B7
A8
B8
aR3 bR3bR2 aR2aL3bL3 bL4aR4
DR
DR1
L2
L3
A
B
TRAVEL(R)TRAVEL(L)
SWINGSTICK BOOMBUCKET
OUT IN R L OPEN CLOSE DOWN UP
TP
TT
BACK FWD FWD
T2T1 T3 T4
BACK
JLP
JLT
JL1 JL3 JL2 JL4 JR4 JR2 JR3 JR1
JRP
JRT
bR1 aR1 aL1 bL1
µµµ µ
µµµ µµµµ µ
(23) CYLINDER GP
STICK
PG2
DE2
B2
A2
PA2
M2
DB2
PG1
PB1
DE1
B1
A1
PA1
M1
DB1
B
A
BR3 AR3
AR2 BR2
PB2
X
BA
B
A
AG
AGBG
BG
T2
T2
T1
T1
BR
BR
X
B
A
L
L
B
A
AR1BR1 AL1 BL1
(22) CYLINDER GP
BUCKET
(4) VALVE GP
MANUAL
COUNTERWEIGHT CNTROL
123-2515
(1) VALVE GP
CHECK (PILOT OPERATED)
087-5087
AL3BL3 BL4 AL4
(21) CYLINDER GP
BOOM
P
A1 B1
C
P
V
BOOM(1) STICK(2)
HL
aL5
Dr
R2
X
dL5(DOWN)
BPiBDr
(UP)
aL4
(IN)
CV1
CV2
A
MU
(OUT)
BL3 AL3 BL4
AL4
C
X
T
P
Dr
Pi1
bL4
BUCKETATCHTRAVEL(L)SWING
Pp1
(CLOSE)
AL2BL2
aL2PAT
(OPEN)bL2
(B) (F)
PTAPSW
(BACK)
(FWD)
dST1
(BACK)(F)(B)(R)
(FWD)
(L)
(R) (L)
dSW
Pp2
PiH
aR3
BR2
AR2
bR2
BR1
AR1
bR1
bL1
BL1
AL1
bL3
aR2
aR1
PR
PL aL1 aL3
TRAVEL(R)
STICK(1)BOOM(2)
R1
Y
HR
AR4
R3
dR4 (IN)
(OUT)
APiADr
(UP)
APi2 dR5
A A
MU2 MU2
MU1
MU1
CV
AR3BR3aR4
bR3
CV
1
2
3
4
56
7
8
A
C
D
E
F
1
23
4
56
7
8
A
B
C
D
E
F
B
PiL
(27) MOTOR GP
COOLING FAN
266-8034
(46) VALVE GP
SLOW RETURN CHECK
185-0384
(37) VALVE GP
COOLER BYPASS CHECK
123-2505
(26) FILTER GP
DRAIN RETURN
126-2075
(35) TANK GP
HYDRAULIC OIL
227-0431
(24) FILTER GP
RETURN
173-3434
(42) VALVE GP
PILOT MANIFOLD
215-5037
(19) ACCUM GP
PILOT MANIFOLD
164-6981
(36) VALVE GP
BOOM/SWING
PRIORITY
232-4102
(25) FILTER GP
PILOT
158-8987
(32) PUMP GP
COOLING FAN
259-0814
VALVE GP
POWER SHIFT
CONTROL
(33) PUMP GP
DRIVE / IDLER
PILOT HYDRAULIC
221-8869
(40) VALVE GP
LH PILOT CONTROL
(STICK/SWING)
232-4157
(44) VALVE GP
RH PILOT
CONTROL
(BUCKET/BOOM)
232-4158
(43) VALVE GP
PILOT TRAVEL
165-9522
(28) MOTOR GP
LEFT TRAVEL
232-6180
(31) MOTOR GP
SWING LEFT
225-4506
(30) MOTOR GP
RIGHT TRAVEL
232-6180
(45) VALVE GP
RIGHT TRAVEL/BRAKE
266-7843
(34) SWIVEL GP
225-4547
(41) VALVE GP
MAIN CONTROL
259-7774
THIS SCHEMATIC IS FOR THE 345C (ATTACHMENT)
PART #: 232-4123 (HE01)
Components are shown installed on a fully operable machine with the key and engine
off and transmission shifter in neutral.
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Attachment
Air Line
CALLOUTS
Taps (Pressure, Sampling,Sensor) by letter
YY
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations
(3) VALVE AS
MANUAL COUNTERWEIGHT
4I-6188
(2) VALVE GP
COUNTERWEIGHT CONTROL
SOLENOID
123-2514
T
BB
CC
DD
SOS
AA
(29) MOTOR GP
RIGHT SWING
255-4506
(39) VALVE GP
LEFT
TRAVEL / BRAKE
266-7843
(38) VALVE GP
LEFT SWING
MOTOR
107-7056
MACHINE COMPONENT LOCATIONS
46
46
45
45
44
44
43
43
42
42
41
41
40
40
39
39
38
38
37
37
36
36
35
35
34
34
32
32
31
31
30
30
29
29
28
28
27
27
26
26
25
25
24
24
23
23
22
22
21
21
21
19
19
4
4
3
3
2
2
1
1
VIEW ALL CALLOUTS
PUMP AND FILTER GROUP
CC
SOS
AA
BBDD
33
VIEW ALL CALLOUTS
