INTERACTIVE SCHEMATIC
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EC-C3
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E-C61
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© 2011 Caterpillar, All Rights Reserved
Printed in U.S.A.
KENR7835-01
January 2011
Volume 1 of 2: Ultra-High Demolition
345C Excavator
Hydraulic System - Attachment
SPC1-UP
GPH1-UP
Volume 2 of 2: Ultra-High Demolition Continued
Volume 1 of 2 - ULTRA-HIGH DEMOLITION
COMPONENT LOCATION
Description
Part
Number
Machine
Location
Schematic
Location
Accumulator GP - Pilot Manifold Note B 1 B-5
Filter GP - Case Drain Note B 2 A-5
Filter GP - Drain Return Note B 3 A-7
Filter GP - Pilot Note B 4 A-4
Filter GP - Return Oil Note B 5 A-6
Motor GP - Cooling Fan Note B 6 A-7
Motor GP - Swing (Left) Note B 7 F-8
Motor GP - Swing (Right) Note B 8 F-7
Motor GP - Travel (Left) Note B 9 F-6
Motor GP - Travel (Right) Note B 10 F-5
Pump GP - Auxiliary Note C 11 B-4
Pump GP - Cooling Fan Note B 12 B-3
Pump GP - Drive / Idler / Pilot Hydraulic Note B 13 B-4
Swivel GP Note B 14 E-6
Tank GP - Hydraulic Oil Note B 15 A-6
Tee AS Note C 16 D-4
Valve GP - Boom/Swing Priority Note B 17 B-5
Valve GP - Check (Cooler Bypass) Note B 18 B-7
Valve GP - Check (Slow Return) Note B 19 B-8
Valve GP - Fine Swing Motor (Left) Note B 20 E-8
Valve GP - Flow Control (Boom) Note C 21 B-1
Valve GP - Pilot (Boom) Note C 22 B-2
Valve GP - Pilot (Manifold) Note B 23 B-5
Valve GP - Pilot (Shuttle) Note C 24 B-8
Valve GP - Pilot (Travel) Note B 25 D-8
Valve GP - Pilot Control (Bucket/Boom) Note B 26 C-7
Valve GP - Pilot Control (Stick/Swing) Note B 27 C-8
Valve GP - Relief ATCH Note C 28 C-3
Valve GP - Solenoid (4-Function Work Tool) Note C 29 E-3
Valve GP - Solenoid (Boom Pilot) Note C 30 B-2
Valve GP - Solenoid (Negative Flow Control) Note C 31 E-1
Valve GP - Solenoid (Power Shift Control) Note B 32 B-3
Valve GP - Solenoid / Check Note C 33 E-4
Valve GP - Solenoid / Check (E-CV1) Note C 34 E-4
Valve GP - Solenoid / Check (E-CV2) Note C 35 F-4
Valve GP - Solenoid / Check (E-CV3) Note C 36 F-5
Valve GP - Solenoid and Relief (E-RV1) Note C 37 E-4
Valve GP - Solenoid and Relief (E-RV2) Note C 38 F-4
Valve GP - Travel / Brake (Left) Note B 39 E-6
Valve GP - Travel / Brake (Right) Note B 40 E-5
Switch AS - Pressure (Pilot Travel) 106-0179 50 D-4
Switch AS - Pressure 266-5881 51 F-4
Valve AS - Shuttle 8J-6875 52 F-4
Valve GP - Main Control 259-7780 53 C-2
Valve GP - Solenoid (Stick Pilot) 185-0472 54 A-5
Attachment: Ultra-High Demolition
Standard 345C with System 17 Attachment
Note C: Part numbers are location on the System 17 Hydraulic System Attachment
schematic according to effectivity of the machine.
Note B: Part numbers are located on the main Hydraulic System Schematic according to
the effectivity of the machine.
Volume 2 of 2 - ULTRA-HIGH DEMOLITION CNTD
COMPONENT LOCATION
Description
Part
Number
Machine
Location
Schematic
Location
Standard 345C Excavator with System 17 Attachment
Cylinder GP - Boom Note A F-7
Cylinder GP - Bucket Note A C-6
Cylinder GP - Stick Note A C-5
Standard 345C Excavator with Boom Float Attachment
Valve GP - Load Control (Boom Cylinders) F-8
Valve GP - Solenoid (Boom Float Down) D-7
Valve GP - Solenoid (Boom Float Up) E-7
Attachment: Ultra-High Demolition
Switch AS - Pressure (Fore-Boom Pilot) C-2
Valve AS - Shuttle C-3
Valve GP - Check (Bucket Cylinder) B-6
Valve GP - Check (Fore-Boom Stick) D-2
Valve GP - Control (Cab Tilt/Rotator) E-6
Valve GP - Relief (Cab Tilt Cylinder) F-4
Valve GP - Control (Fore-Boom) E-2
Valve GP - Control (Stick Cylinder) B-5
Valve GP - Pilot (Fore-Boom) C-2
Valve GP - Solenoid (Work Tool Free Rotate) F-5
Valve GP - Solenoid (Boom and Fore-Boom Cylinder) B-3
Note A: Refer to parts manual for specific cylinder information.
Note D: Part numbers are located on the Boom Float Hydraulic Attachment Schematic according
to the effectivity of the machine.
185-0472
309-5769
8J-6875
202-6281
233-7881
273-9519
179-2123
329-7252
116-3440
206-3336
219-7876
Note D
Note D
Note D
55
56
57
71
58
59
60
61
62
63
64
65
66
67
68
69
70
Volume 1 of 2 - ULTRA-HIGH DEMOLITION
TAP LOCATION
Tap
Number
Description
Schematic
Location
AA Pilot Pump Delivery Pressure A-4
BB Drive Pump Delivery Pressure B-3
GG Attachment Pilot Pressure (A1) E-3
HH Attachment Pilot Pressure (A2) E-3
JJ Rotator Pilot Pressure (A3) E-3
KK Rotator Pilot Pressure (A4) E-3
SOS Hydraulic Oil Sampling Port A-4
CC Pump Power Shift Pressure A-3
DD Idler Pump Delivery Pressure A-3
EE Idler Pump Negative Flow Signal Pressure E-1
FF Drive Pump Negative Flow Signal Pressure E-1
Volume 2 of 2 - ULTRA-HIGH DEMOLITION CNTD
TAP LOCATION
Tap
Number
Description
Schematic
Location
JJ Fore - Boom Pilot Pressure (p1) E-3
KK Fore - Boom Pilot Pressure (p2) E-2
LL Stick Cylinder Pilot Pressure B-5
MM Auxiliary Pump Pressure D-6
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
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
DRIVE PUMP OUTPUT
IDLER PUMP
POWER SHIFT CONTROL CIRCUIT
PILOT PUMP OUTPUT
COOLING FAN PUMP
ATTACHMENT CONTROL CIRCUIT
MEDIUM PRESSURE PUMP / TILT CAB CYLINDER CIRCUIT
SUPPLY LINE
BUCKET CONTROL AND BUCKET CYLINDER CIRCUIT
RIGHT TRAVEL CONTROL AND RIGHT TRAVEL MOTOR CIRCUIT
TRAVEL SPEED CONTROL CIRCUIT
STICK CONTROL AND STICK CYLINDER CIRCUIT
MEDIUM PRESSURE CONTROL CIRCUIT
BOOM CONTROL AND BOOM CYLINDER CIRCUIT
NEGATIVE FLOW AND HEAVY LIFT CONTROL / TOOL ROTATOR CIRCUITS
LEFT TRAVEL CONTROL AND LEFT TRAVEL MOTOR CIRCUIT
SWING CONTROL AND SWING MOTOR CIRCUIT
SWING BRAKE CONTROL CIRCUIT
FORE-BOOM CYLINDER CIRCUIT
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
CALLOUTS
Taps (Pressure, Sampling, Sensor - by letter)
YY
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.
VOLUME 1 of 2: ULTRA-HIGH DEMOLITION
SCHEMATIC PART NUMBER: 261-5156, CHANGE: 04, VERSION: V
MEDIA NUMBER: KENR7835-01
ATTACHMENT: ULTRA-HIGH DEMOLITION
THIS SCHEMATIC IS FOR THE 345C EXCAVATOR HYDRAULIC SYSTEM
12345678
A
B
C
D
E
F
12345678
A
B
C
D
E
F
BOOM (1) STICK (2)BUCKETATCHTRAVEL(R)TRAVEL(L)SWINGSTICK (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
B2A2
PA2
M2
DB2
PG1
PB1
DE1 B1A1
PA1
M1
DB1
B
A
X
BA
B
A
AG
AG
BG BG
T2
T2
T1
T1
BR
BR
dL5 (IN)
(DOWN)
(UP)(CLOSE)AL2BL2
PAT
(OPEN)
bL2
(F)(B)PTAPSW
(BACK)
(FWD)
dST1
(BACK)(F)(B)(R)
(FWD)
(L)
(R) (L)
dSW
PiL
(IN)
(OUT)(UP)
APi2 dR5
PSA1
X
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
P
T
A1
A2
B1
B2
DR
DR
DR
A
B
P
T
A
CA
CD
CB1
CB2
B
A
A
B
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)
AR2 BR2
AR1BR1 AL1 BL1
bR1 aR1
aL1
bL1
aR3 bR2 bR3 aR2aR4 bL3 bL4 aL3
AR3BR3 aR3
BR2 AR2
bR2
BR1
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
aL2bL2
aR4 aL4
aL4
NO.1
(TRAVEL)
NO.2
(SWING)
NO.3
(LOCK)
dR4
DR
DR1 L2L3
A B
(22) VALVE GP
PILOT (BOOM)
(21) VALVE GP
FLOW CONTROL (BOOM)
(30) VALVE GP
SOLENOID
(BOOM PILOT)
(24) VALVE GP
PILOT (SHUTTLE)
(33) VALVE GP
SOLENOID/CHECK
(29) VALVE GP
SOLENOID
(4-FUNCTION WORK TOOL)
(39) VALVE GP
TRAVEL/BRAKE (LEFT)
(40) VALVE GP
TRAVEL/BRAKE (RIGHT)
(14) SWIVEL GP
(7) MOTOR GP
SWING (LEFT)
(20) VALVE GP
FINE SWING MOTOR (LEFT)
(25) VALVE GP
PILOT (TRAVEL)
(27) VALVE GP
PILOT CONTROL
(STICK/SWING)
(26) VALVE GP
PILOT CONTROL
(BUCKET/BOOM)
(6) MOTOR GP
COOLING FAN
(19) VALVE GP
CHECK (SLOW RETURN)
(18) VALVE GP
CHECK (COOLER BYPASS)
(2) FILTER GP
CASE DRAIN
(17) VALVE GP
BOOM/SWING
PRIORITY
(4) FILTER GP
PILOT
FINE
SWING
(13) PUMP GP
DRIVE/IDLER/
PILOT HYDRAULIC
(32) VALVE GP
SOLENOID
(POWER SHIFT
CONTROL)
(12) PUMP GP
COOLING FAN
PT Pb PaT Dr P P ptA
P
T
A
(36) VALVE GP
SOLENOID/CHECK
(E-CV3)
(3) FILTER GP
DRAIN RETURN
(15) TANK GP
HYDRAULIC OIL
(5) FILTER GP
RETURN OIL
(23) VALVE GP
PILOT
(MANIFOLD)
(1) ACCUMULATOR GP
PILOT MANIFOLD
(11) PUMP GP
AUXILIARY
(38) VALVE GP
SOLENOID AND RELIEF (E-RV2)
(37) VALVE GP
SOLENOID AND
RELIEF (E-RV1)
(35) VALVE GP
SOLENOID/CHECK (E-CV2)
(34) VALVE GP
SOLENOID/CHECK (E-CV1)
(31) VALVE GP
SOLENOID (NEGATIVE FLOW CONTROL)
HH
JJ
GG
KK
SOSAA
(54) VALVE GP
SOLENOID (STICK PILOT)
185-0472
(52) VALVE AS
SHUTTLE
8J-6875
(51) SWITCH AS
PRESSURE
266-5881
(50) SWITCH AS
PRESSURE
(PILOT TRAVEL)
106-0179
AR1
(53) VALVE GP
MAIN CONTROL
259-7780
(8) MOTOR GP
SWING (RIGHT)
(9) MOTOR GP
TRAVEL (LEFT)
(10) MOTOR GP
TRAVEL (RIGHT)
DD
CC
BB
FF
EE
(16) TEE AS
(28) VALVE GP
RELIEF ATCH
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.
VOLUME 2 of 2: ULTRA-HIGH DEMOLITION CONTINUED
SCHEMATIC PART NUMBER: 261-5156, CHANGE: 04, VERSION: V
MEDIA NUMBER: KENR7835-01
THIS SCHEMATIC IS FOR THE 345C EXCAVATOR HYDRAULIC SYSTEM
12345678
A
B
C
D
E
F
12345678
A
B
C
D
E
F
DRAIN / RETURN LINE
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
IDLER PUMP
PILOT PUMP OUTPUT
MEDIUM PRESSURE PUMP / TILT CAB CYLINDER CIRCUIT
BUCKET CONTROL AND BUCKET CYLINDER CIRCUIT
STICK CONTROL AND STICK CYLINDER CIRCUIT
MEDIUM PRESSURE CONTROL CIRCUIT
BOOM CONTROL AND BOOM CYLINDER CIRCUIT
NEGATIVE FLOW AND HEAVY LIFT CONTROL / TOOL ROTATOR CIRCUITS
FORE-BOOM CYLINDER CIRCUIT
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
CALLOUTS
Taps (Pressure, Sampling, Sensor - by letter)
YY
T
A Pp T D
C1
p2
p1
LS
TP
CYLINDER GP
FORE-BOOM
C1'
CYLINDER GP
TILT CAB
C2'
V2V1
C2C1
B
A
C DA B
Pb PaP
LS
M
DR
DR
B A
B A
CYL
Dr
CV Pi
X
X
CYL
Dr
CV Pi
T
T
A
B
P T
A
dR4
Dr
PT Pb PaT Dr P P pt A
P
T
A
TOOL ROTATOR
T-OUT2
3 21
p
t
A
B
A
B
(56) CYLINDER GP
BUCKET
AL3 BL3
(57) CYLINDER GP
STICK
BR3AR3
bR3
(55) CYLINDER GP
BOOM
BL4
AL4
bL4
bL4-1
NOTE A: FREE ROTATE PRESSURE SWITCH
NOTE B: FREE ROTATE VALVE ACTUATED BY PRESSURE SWITCH
(UHD FRONT PARTS)
SEE SCHEMATIC ELEC. 261-5157 FOR FURTHER DETAILS
ABOUT BOOM RECOGNITION
NOTE C: STICK IN SELECTION VALVE 1/2 PUMP (ON IN UHD)
NOTE D: FORE-BOOM DEACTIVATED PTA PRESSURE SWITCH ON
NOTE E: HYDRAULIC SCHEMATIC SHOWS MACHINE IN UHD CONFIGURATION.
VALVES SHOWN IN NEUTRAL POSITION.
FOR INFORMATION ABOUT MACHINE IN RETROFIT CONFIGURATION,
SEE STD HYDRAULIC SCHEMATIC + BLCV + SB + COMB + SLCV.
(58) VALVE GP
LOAD CONTROL (BOOM CYLINDERS)
(60) VALVE GP
SOLENOID
(BOOM FLOAT UP)
(59) VALVE GP
SOLENOID
(BOOM FLOAT DOWN)
(70) VALVE GP
SOLENOID (WORK TOOL FREE ROTATE)
219-7876
NOTE B
(65) VALVE GP
CONTROL (CAB TILT / ROTATOR)
273-9519
(66) VALVE GP
RELIEF (CAB TILT CYLINDER)
179-2123
(67) VALVE GP
CONTROL (FORE-BOOM)
329-7252
(64) VALVE GP
CHECK (FORE-BOOM
STICK)
233-7881
(64) VALVE GP
CHECK (FORE-BOOM STICK)
233-7881
(62) VALVE AS
SHUTTLE
8J-6875
(61) SWITCH AS
PRESSURE (FORE-BOOM PILOT)
309-5769
(69) VALVE GP
PILOT (FORE-BOOM)
206-3336
(71) VALVE GP
SOLENOID (BOOM AND FORE-BOOM CYLINDER)
185-0472
NOTE D
(63) VALVE GP
CHECK (BUCKET CYLINDER)
202-6281
(68) VALVE GP
CONTROL (STICK CYLINDER)
116-3440
KK
JJ
LL
MM
345C STANDARD MACHINE COMPONENT LOCATIONS
40
40
39
39
37
37
36
36
35
35
34
34
33
33
31
31
30
30
28
28
27
27
26
26
25
25
24
24
23
23
22
22
21
21
20
20
19
19
18
18
17
17
16
16
15
15
14
14
12
12
10
10
9
9
8
8
7
7
6
6
5
5
4
4
3
3
2
2
1
1
VIEW ALL CALLOUTS
BOOM AND FORE-BOOM CYL SOLENOID VALVE
MAIN CONTROL VALVE
71
BOOM FOOT
70
64
VIEW ALL CALLOUTS
BUCKET CYLINDER CHECK VALVE
63
CAB TILT/ROTATOR CONTROL VALVE
65
MM
VIEW ALL CALLOUTS
FORE-BOOM CONTROL VALVE
67
JJKK
VIEW ALL CALLOUTS
NEGATIVE FLOW CONTROL
38
EE
FF
VIEW ALL CALLOUTS
PUMP AND FILTER GP
32
13
SOS
DD
CC
BB
AA
VIEW ALL CALLOUTS
SHUTTLE VALVE
MAIN CONTROL VALVE
FRONT VIEW
62
STICK CYLINDER CONTROL VALVE
68
LL
VIEW ALL CALLOUTS
SYSTEM 17 AND BOOM FLOAT ATTACHMENT COMPONENTS
6059
58
57
56
55
VIEW ALL CALLOUTS
TILT CAB (FLOOR REMOVED)
69
66
61
VIEW ALL CALLOUTS
ULTRA-HIGH DEMOLITION
54
53
52
51
50
VIEW ALL CALLOUTS
WORK TOOL SOLENOIDS
29
11
GG
HH
JJ
KK
VIEW ALL CALLOUTS
