RENR7248
30 Page
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)
System 11: Combined Function / Auxilliary Control Valve
RENR7248
July 2006
345C Excavator
Hydraulic System - Attachment
TBA1-UP
WDE1-UP
BWY1-UP
©
2006 Caterpillar
All Rights Reserved
Printed in U.S.A.
Description
Part
Number
Machine
Location
Schematic
Location
Accumulator Assembly 230-0191 1 B-8
Filter As - Attachment 247-8895 2 B-7
Pump Gp - Auxiliary 136-8899 3 B-3
Tee Assembly 164-5550 4 D-3
Valve Gp - Attachment Relief 239-8984 5 C-3
Valve Gp - Boom & Attch Pilot Solenoids 225-8142 6 E-4
Valve Gp - Boom Pilot 119-5219 7 B-1
Valve Gp - Check 239-9036 8 C-3
Valve Gp - Control Medium Pressure 232-4103 9 F-3
Valve Gp - Flow Control (Boom) 4I-7836 10 B-1
Valve Gp - Left Work Tool Foot Pedal 206-3336 11 E-7
Valve Gp - Negative Flow Control Solenoid 171-0188 12 E-1
Valve Gp - Pilot Shuttle 185-0462 13 B-8
Valve Gp - Relief (RV1) 239-9102 14 E-4
Valve Gp - Right Work Tool Foot Pedal 206-3336 15 E-7
Valve Gp - Solenoid / Check (E-CV1) 215-4888 16 E-4
Valve Gp - Solenoid / Check (E-CV2) 215-4888 17 F-4
Valve Gp - Solenoid / Check (E-CV3) 215-4890 18 E-2
Accumulator Gp - Pilot Manifold Note B 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 B 23 A-8
Filter Gp - Case Drain Note B 24 A-5
Filter Gp - Pilot Note B 25 B-4
Filter Gp - Return Oil Note B 26 A-7
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-7
Motor Gp - Right Travel Note B 30 F-5
Motor Gp - Swing Left Note B 31 F-8
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 A-7
Valve Gp - Left Swing Motor Note B 38 E-8
Valve Gp - Left Travel / Brake Note B 39 E-6
Valve Gp - LH Pilot Control (Stick/Swing) Note B 40 C-8
Valve Gp - Main Control Note B 41 D-1 thru D-6
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-5
Valve Gp - Slow Return Check Note B 46 B-7
Note A: Refer to parts manual for specific cylinder information.
Component Locations
System 11 Attachment
Standard 345C
Note B: Part numbers are located on the main Hydraulic System Schematic according to
the effectivity of the machine.
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
EE Idler Pump Negative Flow Signal Pressure E-1
FF Drive Pump Negative Flow Signal Pressure E-1
SOS Hydraulic Oil Sampling Port A-4
1 9
2
16
14
13 40 20 11
2143
1544 21 22
23
34
17296
18
38
31
3524
25
26
3
33
12 30
45
39
28
46
37
7
10
5
8
4
42
19
4136
27
32
2321
24
25
30
45
28
39
26 10
35
7
19
4236
3
33
12
32
27
29
31
38
11
15
43
201334
44
40
46
37
9
2
18
6
17
16
14
41
5
8
41
12
33
BB
DD
CC
FF
EE
SOS
AA
NEGATIVE FLOW CONTROL
MACHINE COMPONENT LOCATIONS
PUMP & FILTER GROUP
RENR7248
30 Page, Color 2
THIS SCHEMATIC IS FOR THE 345C (ATTACHMENT)
PART #: 230-2702 HE01
This Attachment Schematic is intended to be used with the Standard Hydraulic Schematic
for the specific machine.
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
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations
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
GRAPPLE PUMP
SUPPLY LINE
BUCKET CONTROL & BUCKET CYLINDER CIRCUIT
RIGHT TRAVEL CONTROL & RIGHT TRAVEL MOTOR CIRCUIT
TRAVEL SPEED CONTROL CIRCUIT
STICK CONTROL & STICK CYLINDER CIRCUIT
MEDIUM PRESSURE CONTROL 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
VALVE GP
LEFT
TRAVEL/BRAKE
FILTER AS.
ATTACHMNET
247-8895
MOTOR GP
LEFT SWING
VALVE GP
LEFT SWING MOTOR
MOTOR GP
RIGHT SWING
VALVE GP
LT WORK TOOL
FOOT PEDAL
206-3336
VALVE GP
RT WORK TOOL
FOOT PEDAL
206-3336
PUMP GP
AUXILLIARY
136-8899
BB
CC
DD
EE
FF
SOS
AA
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
1P/2P 1WAY/2WAY ---
SOL1 EC3 SOL2 EC1 EC2 ---
X X X O O
1P SINGLE
X X O X X
1P DOUBLE
O O X O O
2P SINGLE
O O O X X
2P DOUBLE
BUCKET
CYLINDER
BOOM
CYLINDER
BOOM
CYLINDER
STICK CYLINDER
BOOM(1)
STICK(2)
BUCKETATCH
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
Pi1
P2
P-IN
PSA2
DR1
T-OUT2
DR2
DR3
DR4
Pi2
DR5
DR6
T-OUT1
P1
P2
T
B1
A1 B2 A2
A4B1 Dr1 DiPS2 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
B
A
X
BA
B
A
AG
AG
BG
BG
T2
T2
T1
T1
BR
BR
dL5
(DOWN)
BPi
BDr
(UP)
(CLOSE)
AL2
BL2
PAT
(OPEN)
(F)
(B)
PTA
PSW
(BACK)
(FWD)
dST1
(BACK)
(F)(B)
(R)
(FWD)
(L)
(R) (L)
dSW
PiL
(IN)
(OUT)
APiADr(UP)
APi2 dR5
PSA1
X
(IN)
Pp2
PCPG
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
P
T
A
B
M
LS
A
B
CA
CD
CB1
CB2
TEE AS
164-5550
VALVE GP
CHECK
239-9036
A
B
PB
PA
VALVE GP
ATTCH RELIEF
239-8984
A
B
DR
B
A
8
5
1
7
6
2
4
A
CV1
CV2 MU
A
MU1
MU2
CV
A
MU1
MU2
CV
L
B
A
A
B
L
RT
LP
1
2
1
2
3
3
P1
P2
A2A1
T
RP
LT
B
L
L1S
X
(OUT)
3
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
aL2
bL2
bL2
aR4
dR4
aL4
aL4
NO.1
(TRAVEL)
NO.2
(SWING)
NO.3
(LOCK)
dR4
aL2
DR
DR1
L2
L3
A
B
µµµ µ
µµµ µµµµ µ
MOTOR GP
COOLING FAN
VALVE GP
CHECK
SLOW RETURN
VALVE GP
CHECK COOLER
BYPASS
ACCUMULATOR AS.
230-0191
VALVE GP
PILOT
SHUTTLE
185-0462
VALVE GP
LH PILOT CONTROL
STICK/SWING
VALVE GP
RH PILOT CONTROL
BUCKET/BOOM
VALVE GP
PILOT CONTROL
TRAVEL
MOTOR GP
RIGHT TRAVEL
VALVE GP
RIGHT
TRAVEL/BRAKE
SWIVEL GP
VALVE GP
NEGATIVE FLOW
CONTROL SOLENOID
171-0188
VALVE GP
SOLENOID/CHECK
(E-CV3)
215-4890
VALVE GP
SOLENOID/CHECK
(E-CV2)
215-4888
VALVE GP
SOLENOID/CHECK
(E-CV1)
215-4888
VALVE GP
RELIEF (RV1)
239-9102
VALVE GP
BOOM & ATTCH
PILOT SOLENOIDS
225-8142
VALVE GP
CONTROL
MEDIUM
PRESSURE
232-4103
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 SOL
PUMP GP
DRIVE/IDLER
& PILOT
VALVE GP
BOOM PILOT
119-5219
VALVE GP
FLOW CONTROL
BOOM
4I-7836
VALVE GP
MAIN CONTROL
BLOCK
MOTOR GP
LEFT TRAVEL
