RENR7397-02
30 Page: (Dimensions: 39 inches x 28 inches)
March 2007
©
2007 Caterpillar
All Rights Reserved
Printed in U.S.A.
345C Excavator
Hydraulic Attachment
RENR7397-02
SPC1-UP
GPH1-UP
GCL1-UP
S5M1-UP
ELS1-UP
LYS1-UP
Boom Float
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
FLUID POWER SYMBOLS
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 ACTING
SINGLE 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
Hydraulic Symbols (Electrical)
Electrical Symbols Table
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
T
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
Electrical Symbols (Electrical)
Description
Part
Number
Machine
Location
Schematic
Location
Valve Gp - Solenoid 185-0472 7 D-1
Valve Gp - Solenoid (Boom Float Up) 215-4890 2 E-1, E-2
Valve Gp - Solenoid (Boom Float Down) 215-4890 1 E-2
Valve Gp - Main Control 259-7777 5 D2 to D-6
Valve Gp - Manual Boom Lower 239-8823 8 E-2
Valve Gp - Flow Control 255-5745 3 D-1
Valve Gp - Load Control (Boom Cylinders) 263-1964 4 F-1, F-3
Accumulator Gp - Pilot Manifold Note B 19 B-5
Cylinder Gp - Boom Note A 21 F-2
Cylinder Gp - Bucket Note A 22 F-8
Cylinder Gp - Stick Note B 23 E-8
Filter Gp - Return Note B 24 A-6
Filter Gp - Pilot Note B 25 A-4
Filter Gp - Drain Return Note B 26 A-6
Motor Gp - Cooling Fan Note B 27 A-7
Motor Gp - Left Travel Note B 28 F-6
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-7
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 - Pilot Manifold Note B 42 B-5 thru B-6
Valve Gp - Pilot Travel Note B 43 D-7 , 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.
Note B: Part Numbers are located on the main Hydraulic System Schematic according to the
effectivity of the machine.
Component Locations
Attachment
Standard 345C
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
25
SOS
AA
44
BB
DD
CC
33
PUMP and FILTER GROUP
DR2
T-OUT2
DR1
PSA1
PSA2
P-IN
Pi 1
P2
LOCK
SWING
TRAVEL
PILOT OIL MANIFOLD
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)
MAIN CONTROL VALVE
MACHINE COMPONENT LOCATIONS
40 214344
21 22
23
3429
38 31
3524 25 2633 3045
3928 4637
19 36 5
2732
2321
24 253045 2839 26 35 4219 3633
32 27 29 31 38
43
34 44404637 5
22
6 4
1 2 442
3
7
1 2 6
3 7 4
8
8
RENR7397-02
30 Page: (Dimensions: 39 inches x 28 inches)
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
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
THIS SCHEMATIC IS FOR THE 345C (ATTACHMENT)
PART #: 239-8690 (HE02)
Components are shown installed on a fully operable machine with the key and engine off and transmission
shifter in neutral.
Refer to the appropriate Service Manual forTroubleshooting, Specifications and Systems Operations
µµµ µ
T
A2
A4 B1
Dr1 Di PS2 PB
Pi2
D0 PS1
Pi1
a2
a5
a3
A2
a1
a4
A1
PSV
IN
A
T
P
1
7
8
S L1 L
B
5
PR
PL
Pi1P2
P-IN PSA2 DR1
T-OUT2 DR2
DR3
DR4
Pi2 DR5
DR6
T-OUT1
P1
PSA1
NO.1(TRAVEL)
NO.2(SWING)
NO.3
(LOCK)
P1 P2
B1 A1 B2
T
OUT
6
DR
DR1
L2
L3
A
B
bR2 aR2bL3 bL4-1aR4 bR3aR3
OUT
IN
R
L
OPEN
CLOSE
DOWN
UP
JL1
JL3
JL2
JL4
JR4
JR2
JR3
JR1
SWING
STICK BOOM
BUCKET
JLP
JLT
JRP
JRT
bR1 aR1 aL1 bL1
TRAVEL(R)
TRAVEL(L)
TT
TP
BACK BACK
FWD
FWD
T4
T1 T3T2
aL3
µµµ µ µµµ µ
BUCKET
CYLINDER
STICK CYLINDER
PG2
A2
PA2
M2
DB2
PG1
PB1
DE1 B1A1
PA1
M1
DB1
BA
BL3 AL3
BR3 AR3
AR2 BR2
PB2
DE2
B2
X
AG
BG
T2
T1
AR1
BR1
BA
BR
L
B
A
AG
BG
T2
T1
X
VALVE GP
263-1964
BR
L
AL1
BL1
BOOM(1) STICK(2)
BUCKET
ATCH
TRAVEL(R)
HL
aL5
Dr
R2
X
Pp1
dL5
(DOWN)
(UP)
bL3
(CLOSE)
AL2
BL2
aL2
PAT
(OPEN)bL2
(F)(B)
(BACK)
(FWD) (IN)
VALVE GP
255-5745
VALVE GP
185-0472
BL4
VALVE GP-SOLENOID
215-4890
(E-CV2)
VALVE GP
239-8823
VALVE GP
215-4890
(E-CV1)
SW-1
DR
DR
aL4
VALVE GP
259-7777
B
A
B
A
AL4
AL4
CYL
Dr
CV
Pi
CYL
CV
Pi
T
T
(OUT)
AL3BL3
aL1
bL1
AL1
BL1
aL3
bL3
bL4
A
B
P
T
A
bL4
bL4-1
PR
PL
BL4
BL4
PTA
BOOM
CYLINDER
BOOM
CYLINDER
X
X
Dr
TRAVEL(L)
SWING
PSW
dST1
(BACK)
(B)
(F)
(R)
(FWD)
(L)
(R)
(L)
dSW
PiL
(IN)
(OUT)
APi
ADr
dR5
Pp2
PiH
BR3
AR3
BR2
AR2
BR1
AR1
bR1
bR2
aR3
STICK(1)
aR1aR2
bR3
BOOM(2)
R1
Y
HR
AR4
R3
dR4
aR4
(UP)
APi2
AR4
1
2
3
4
5
6
7
8
A
C
D
E
F
1
23
4
56
7
8
A
B
C
D
E
F
B
VALVE GP
CHECK
SLOW RETURN
VALVE GP
CHECK COOLER
BYPASS
FILTER GP
DRAIN RETURN
TANK GP
HYDRAULIC
FILTER GP
RETURN
VALVE GP
PILOT
MANIFOLD
ACCUMULATOR GP
PILOT MANIFOLD
FILTER GP
CASE DRAIN
VALVE GP
BOOM/SWING
PRIORITY
FILTER GP
PILOT
PUMP GP
COOLING FAN
VALVE GP
POWER SHIFT
CONTROL
PUMP GP
DRIVE/IDLER
& PILOT
VALVE GP
LH PILOT CONTROL
STICK/SWING
VALVE GP
RH PILOT CONTROL
BUCKET/BOOM
VALVE GP
PILOT CONTROL
TRAVEL
MOTOR GP
LEFT SWING
VALVE GP
LEFT SWING MOTOR
MOTOR GP
RIGHT TRAVEL
VALVE GP
RIGHT
TRAVEL/BRAKE
SWIVEL GP
MOTOR GP
RIGHT SWING
MOTOR GP
LEFT TRAVEL
VALVE GP
LEFT
TRAVEL/BRAKE
LOAD CONTROL
VALVE GP
263-1964
LOAD CONTROL
BOOM FLOAT UP
PC
PG
SOS
AA
MANUAL BOOM LOWER
BOOM FLOAT DOWN
FLOW CONTROL
SOLENOID
MAIN CONTROL
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Attachment
Air Line
CALLOUTS
Taps (Pressure, Sampling,Sensor) by letter
Components by number
YY
52
BB
CC
DD
