INTERACTIVE SCHEMATIC
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X
EC-C3
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E-C60
EC-C1
E-C61
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Hydraulic System
©
2010 Caterpillar, All Rights Reserved
Printed in U.S.A.
KENR6103-01
December 2010
345C Material Handler with Cab Riser
MTE1-UP
Attachments : Smart Boom and Reverse Fan
Page 1 of 2
COMPONENT LOCATION
Description
Part
Number
Machine
Location
Schematic
Location
Accumulator Gp - Pilot Manifold 164-6981 1 B-5
Cooler Gp - Oil 210-8164 2 B-7
Cylinder Gp - Boom Note A 3 F-5
Cylinder Gp - Cab Note A 4 F-4
Cylinder Gp - Cab Riser Note A 9
Cylinder Gp - Stick Note A 6 B-8
Filter Gp - Return (Inside Hydraulic Tank) 173-3434 7
A-5
Filter Gp - Drain Return 126-2075 8
A-3
Filter Gp - Pilot Pressure 188-2084 8 A-4
Motor Gp - Left Swing 225-4506 11 E-8
Motor Gp - Left Travel 170-7572 12 F-7
Motor Gp - Right Swing 225-4506 13 F-8
Motor Gp - Right Travel 170-7572 14 F-6
Pump Gp - Grapple 136-8899 15 B-3
Pump Gp - Hydraulic Fan 283-6084 15 B-2
Pump Gp - Main Hydraulic 266-7944 15 B-3
Sensor Gp - Drive Pump Pressure 221-8869 15 B-2
Sensor Gp - Idler Pump Pressure 221-8869 15 A-2
Switch As - Implement Pressure 106-1079 17 D-4
Switch As - Travel Pressure 106-1079 17 D-4
Swivel Gp - Joint 225-4547 18 E-7
Tank Gp - Hydraulic 227-0431 7 A-6
Valve Gp - Boom / Swing Priority 232-4102 19 B-4
Valve Gp - Cab Lowering Control 226-9860 21 F-4
Valve Gp - Cab Lowering Control 232-7226 22 F-4
Valve Gp - Cab Lowering Load Control 185-1247 4 F-4
Valve Gp - Check Cooler Bypass 123-2505 23 B-7
Valve Gp - Check Slow Return 185-0384 23 B-7
Valve Gp - Flow Control (Pilot Oil) 4I-7836 16 E-4
Valve Gp - Left Swing Cushion 107-7056 11 E-8
Valve Gp - Left Travel / Counterbalance 165-9338 12 E-7
Valve Gp - Lock Solenoid 121-1491 1 B-5
Valve Gp - Main Control 259-7782 17 D-2
Valve Gp - Pilot Control Grapple / Boom 206-3305 24 C-7
Valve Gp - Pilot Control Manifold 215-5037 1 B-6
Note A : See Parts Manual for Specific Cylinder Part Number
Note B : Grapple Cylinders are located on Grapple Attachment
B-7
Page 2 of 2
COMPONENT LOCATION
Description
Part
Number
Machine
Location
Schematic
Location
Valve Gp - Pilot Control Stick / Swing 206-3305 25 C-8
Valve Gp - Pilot Control Travel 165-9522 26 D-8
Valve Gp - Power Shift Control 225-4518 15 B-2
Valve Gp - Press. Reducing (Cab Riser) 257-2892 16 E-4
Valve Gp - Relief 177-2708 17 C-3
Valve Gp - Relief (Pilot) 184-1227 5 C-8
Valve Gp - Relief (Pilot) 184-1227 5 C-8
Valve Gp - Right Travel / Counterbalance 165-9338 14 E-6
Valve Gp - Stick Check & Relief 202-9264 27
A-8
Valve Gp - Swing Brake Solenoid 121-1491 1 B-6
Valve Gp - Travel Speed Solenoid 121-1491 1 B-6
Valve Gp - Work Tool / Cab Control 285-1745 28 F-3
Valve Gp - Work Tool / Cab Solenoid 185-0507 16 E-3
Switch As - Press, Pilot, Bm Lower 309-5769 30 B-1
Valve Gp - Boom Load Control 263-1964 31
F-5
Valve Gp - Check, E-CV1 297-0370 32 E-6
Valve Gp - Check, E-CV2 297-0370 33 E-5
Valve Gp - Emergency, Manual Bm Lwr 270-5692 34 E-5
Valve Gp - Flow Control, Pilot 255-5745 35 B-1
Valve Gp - Solenoid, Pilot 185-0472 36 B-1
Motor Gp - Cooling Fan 200-3252 40 A-7
Valve Gp - Reversing Fan Control 234-4624 40 A-7
Valve Gp - Reversing Fan Solenoid 242-6880 41 A-6
Attachment - Smart Boom
Attachment - Reversing Fan
TAP LOCATION
Tap
Number
Description
Schematic
Location
AA Pilot Pressure Test Port A-4
BB Work Tool Rotate Pressure Test Port (B2) E-3
CC Work Tool Rotate Pressure Test Port (B1) E-3
DD Cab Raise Pressure E-3
EE Cab Lower Pressure E-3
SOS 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
DRAIN / RETURN LINE
LINES GROUP COLOR DESCRIPTIONS
DRIVE PUMP OUTPUT
IDLER PUMP OUTPUT
POWER SHIFT CONTROL CIRCUIT
PILOT PUMP OUTPUT
HYDRAULIC OIL COOLING PUMP OUTPUT
GRAPPLE CYLINDER 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
LEFT TRAVEL CONTROL & LEFT TRAVEL MOTOR CIRCUIT
SWING CONTROL & SWING MOTOR CIRCUIT
SWING BRAKE CONTROL CIRCUIT
WORK TOOL ROTATE PUMP
WORK TOOL ROTATE & CAB CYLINDER CONTROL CIRCUIT
THIS SCHEMATIC IS FOR THE 345C MATERIAL HANDLER
WITH CAB RISER
PART NUMBER: 291-4253, CHANGE: 00, VERSION: V
Components are shown installed on a fully operable machine.
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
(7) FILTER GP
RETURN
173-3434
(15) SENSOR GP
IDLER PUMP PRESSURE
221-8869
(17) VALVE GP
MAIN CONTROL
259-7782
(23) VALVE GP
CHECK
SLOW RET
185-0384
(15) PUMP GP
HYDRUALIC FAN
283-6084
(30) SWITCH AS
PRESS, PILOT,BM LOWER
309-5769
(16) VALVE GP
WORK TOOL
CAB SOLENOID
185-0507
(14) MOTOR GP
RIGHT TRAVEL
170-7572
DEFAULT
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
BOOM(1)
STICK(2)
GRAPPLE
TRAVEL(R)
TRAVEL(L)
SWINGSTICK(1)BOOM(2)
TRAVEL(R)TRAVEL(L)
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
P1
dL5
(DOWN)
AL4
(UP)
AL2BL2
PAT
(F)(B)
PTAPSW
(BACK)
(FWD)
dST1
(BACK)(F)(B)(R)
(FWD)(L)
(R) (L)
dSW
PiL
(OUT)
(IN)
BR3
(UP)
APi2
dR5
PSA1
(IN,OUT)
Pp2
PC
PG
T
OUT
IN
TP
TT
BACK FWD FWD
T5 T2T1 T3 T6 T4
BACK
PiH
aR4
bR1 aR1 aL1 bL1
AR3
BR3
aR3
BR2
AR2
bR2
BR1
AR1
bR1
bL1
BL1
AL1
bL3
BL4
AL4
bR3
aR2 aR1
PR
PL aL1
aL3
bL4
aL2
bL2
dR4
NO.1(TRAVEL)
NO.2(SWING)
NO.3(LOCK)
SWINGSTICK BOOMGRAPPLE
OUT IN R L OPEN CLOSE DOWN UP
JLP JLT
JL1 JL3 JL2 JL4 JR4 JR2 JR3 JR1
JRP
JRT
A1
B1
A2
B2
A3
B3
A4
B4
A5
B5
A6
B6
A7
B7
A8
B8
Pp
Dr
T
A
C
C
A
T
Dr
Pp
aR3
(6) CYLINDER GP
STICK
(CLOSE)
(OPEN)
SHV
BL2
AL2
DR
DR1
L3
L2
A
A
B
B
T
P
S
S
T Pi
B
S
A1
a1
L1
L
X
PL
a5
a3
PSV
a4
PR
A2
a2
A2
BL4
8
1
7
6
5
2
3
AR3
SWING MOTOR
SWING MOTOR
PG2
PB2
DE2 B2
A2
PA2
M2
DB2
PG1
PB1
DE1
B1A1
PA1
M1
DB1
BA
TRAVEL MOTOR (LEFT) TRAVEL MOTOR (RIGHT)
X
BA
B
A
MA MAMB MB
L' L'
T2 T2
T1 T1
BR BR
SWIVEL
X
AR1BR1 AL1 BL1
P
A BPB
PA
T
P
A1B1A2B2
PT
BPB1
PA1
A
Dr
PL
B
M
LS
A3B3A4B4
BL4
AR2
BR2
aL4
GRAPPLE
ROTATE
CAB
RAISE
CAB
LOWER
aR4
(17) SWITCH AS
TRAVEL PRESS
106-0179
(17) SWITCH AS
IMPLEMENT
PRESSURE
106-0179
AA SOS
(26) VALVE GP
PILOT CONTROL
TRAVEL
165-9522
(25) VALVE GP
PILOT CONTROL
STICK/SWING
206-3305
(24) VALVE GP
PILOT CONTROL
GRAPPLE/BOOM
206-3305
(11) VALVE GP
LEFT SWING
CUSHION
107-7056
(11) MOTOR
GP LT SWING
225-4506
(13) MOTOR GP
RT SWING
225-4506
(12) MOTOR GP
LEFT TRAVEL
170-7572
(12) VALVE GP
LEFT TRAVEL
COUNTERBALANCE
165-9338
(18) SWIVEL GP
JOINT
225-4547
BB CCDD EE
aR3bR2aL2bL2 bL4-1aR4 bR3 aR2
AL2
BL2
A
B
P
T
A
bL4
bL4-1
Dr
OUT
IN
A
B
A
B
A
CYL
Dr
CV
Pi
X
T
CYL
Dr
CV
Pi
X
T
Dr
Dr
B A
B A
AL4
AR3
BR3
(17) VALVE GP
RELIEF
177-2708
Dr
OUT
IN
Dr
OUT
IN
NOTE A :
NOTE B : ATTACHMENT REVERSE FAN
ATTACHMENT SMART BOOM
(5) VALVE GP
RELIEF
PILOT
184-1227
(9) CYLINDER GP
CAB RISER
(27) VALVE
GP
STICK
CHECK
AND
RELIEF
202-9264
(40) MOTOR GP
COOLING FAN
200-3252
(23) VALVE GP
CHECK COOLER
BYPASS
123-2505
(2) COOLER GP
OIL
210-8164
(1) VALVE GP
TRAVEL SPEED SOLENOID
121-1491
(1) VALVE GP
SWING BRAKE SOLENOID
121-1491
(15) PUMP GP
GRAPPLE
136-8899
(15) PUMP GP
MAIN HYD
266-7944
(15) VALVE
GP
POWER
SHIFT
CONTROL
225-4518
(36) VALVE GP
SOLENOID
BM PILOT
185-0472
(35) VALVE GP
FLOW CONTROL
PILOT
255-5745
(15) SENSOR GP
DRIVE PUMP
PRESSURE
221-8869
(19) VALVE GP
BOOM/SWING
PRIORITY
232-4102
(1) VALVE
GP LOCK
SOLENOID
121-1491
(1) ACCUM GP
PILOT
MANIFOLD
164-6981
(40) VALVE
GP
REVERSING
FAN
CONTROL
234-4624
(41) VALVE GP
REVERSING FAN
SOLENOID
242-6880
(7) TANK GP
HYDRAULIC
227-0431
(8) FILTER
GP DRAIN
RETURN
126-2075
(8) FILTER GP
PILOT PRESSURE
188-2084
(8) FILTER GP
DRAIN
RETURN
126-2075
(1) VALVE GP
PILOT CONTROL
MANIFOLD
215-5037
(16) VALVE GP
PRESS. REDUCING
(CAB RISER)
257-2892
(16) VALVE GP
FLOW
CONTROL
PILOT OIL
4I-7836
(34) VALVE GP
EMERGENCY
MANUAL
BOOM
LOWER
270-5692
(33) VALVE GP
CHECK
E-CV2
297-0370
(14) VALVE GP
RIGHT TRAVEL
COUNTERBALANCE
165-9338
(32) VALVE GP
CHECK
E-CV1
297-0370
(31) VALVE GP
BOOM LOAD
CONTROL
263-1964
(3) CYLINDER GP
BOOM
(31) VALVE GP
BOOM LOAD
CONTROL
263-1964
(22) VALVE GP
CAB LOWERING
CONTROL
232-7226
(21) VALVE GP
CAB LOWERING
CONTROL
226-9860
(4) CYLINDER GP
CAB
(4) VALVE GP
CAB LOWERING
LOAD
CONTROL
185-1247
(28) VALVE GP
WORK TOOL/CAB
CONTROL
285-1745
(5) VALVE GP
RELIEF
PILOT
184-1227
MACHINE COMPONENT LOCATIONS
40
40
41
41
28
28
27
27
26
26
25
25
24
24
23
23
22
22
21
21
19
19
18
18
17
17
16
16
15
15
14
14
13
13
12
12
11
11
9
9
8
8
7
7
6
6
6
5
5
4
4
3
3
3
2
2
1
1
VIEW ALL CALLOUTS
FILTER GROUP
SOS
AA
8
VIEW ALL CALLOUTS
MAIN CONTROL VALVE
FRONT VIEW
aL5 aL4 bL3 aL2 bL1 bR1 bR2 aR3 aR4
AL4
BL3 BL2 BL1
BL4 AL3 AL2 AL1
BR1 BR2
AR3
AR4
AR1 AR2 BR3
PTA PSW
Y
X
TRAVEL
(L)
STR
TRAVEL
SWING
PiH
STICK
(1)
BOOM
(2)
BOOM
(1)
ATT
GRAPPLE
TRAVEL
(R)
STICK
(2)
PILOT CONTROL MANIFOLD VALVE
DR2 T-OUT2
DR1
PSA1
PSA2
P-IN
Pi 1
P2
DR6
DR5
DR4 DR3
Pi 2
T-OUT1
LOCK SWING TRAVEL
SMART BOOM
36
35
34
34
33
33
32
32
31
31
31
30
3
3
3
VIEW ALL CALLOUTS
WORK TOOL SOLENOIDS
16
EE
DD
CC
BB
VIEW ALL CALLOUTS
