INTERACTIVE SCHEMATIC
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Information
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Tap Table
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Electrical Symbols
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X
EC-C3
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E-C61
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©
2012 Caterpillar, All Rights Reserved
Printed in U.S.A.
Medium Pressure
KENR6779-06
April 2012
Hydraulic System - Attachment
345D and 349D Excavator
345D:
RGD1-UP
RAE1-UP
YEE1-UP
NEG1-UP
RGG1-UP
EEH1-UP
KFH1-UP
RAJ1-UP
NLM1-UP
GYR1-UP
PBT1-UP
LKY1-UP
349D:
NNF1-UP
RBJ1-UP
MEN1-UP
KHS1-UP
COMPONENT LOCATION
Description
Part
Number
Machine
Location
Schematic
Location
Accumulator Gp - Pilot Manifold 164-6981 1 C-1
Cylinder Gp - Boom Note A 2 F-3
Cylinder Gp - Bucket Note A 3 F-4
Cylinder Gp - Stick Note A 4 F-2
Filter Gp - Case Drain 289-8194 5 B-2
Filter Gp - Drain Return 289-8194 6 C-2
Filter Gp - Pilot 158-8987 7 B-1
Filter Gp - Return 188-4145 8 C-1
Motor Gp - Cooling Fan 295-9429 10 A-4
Motor Gp - Left Travel 232-6180 11 B-8
Motor Gp - Right Travel 232-6180 12 B-7
Motor Gp - Swing 225-4506 13 A-5
Pump Gp - Cooling Fan 295-9426 14 A-3
Pump Gp - Drive, Idler, Pilot 295-9663 15 A-2
Sensor Gp - Pressure, Bm Dn Pilot 297-4483 31 C-4
Sensor Gp - Pressure, Boom Cyl. Head 221-8859 25 F-3
Sensor Gp - Pressure, Pump 260-2180 17 A-3
Sensor Gp - Pressure, Pump 260-2180 18 B-3
Switch As - Press., Bm Up/Stck In Pilot 309-5769 20 E-7
Switch As - Press., Implmnt, Trvl Pilot 106-0179 21 D-5
Switch As - Pressure, Swing Pilot 309-5769 19 E-8
Swivel Gp 225-4547 22 A-7
Valve Gp - Boom Control 297-0595 25 E-3
Valve Gp - Check, Cooler Bypass 123-2505 27 B-4
Valve Gp - Check, Slow Return 285-1715 27 B-5
Valve Gp - Heavy Lift 121-6303 28 B-5
Valve Gp - Left, Travel/Brake 266-7843 11 A-8
Valve Gp - LH Plt Cntrl, Stck/Swng 270-5951 30 F-7
Valve Gp - Main Control 310-0101 31 D-4
Valve Gp - Pilot Manifold 215-5037 32 C-2
Valve Gp - Control Pump 297-0641 23 D-3
Valve Gp - Plt Contr. Travel 165-9522 33 F-8
Valve Gp - Priority, Boom/Swing 232-4102 26 E-7
Valve Gp - RH Plt Cntrl, Bckt/Bm 270-5952 34 F-6
Valve Gp - Right, Travel/brake 266-7843 12 A-7
Valve Gp - Shuttle, Stick Pilot 123-2430 36 E-7
Valve Gp - Shuttle, Swing Pilot 123-2430 37 E-8
Valve Gp - Swing Motor 295-9423 38 A-6
Pump Gp - Medium Pressure 136-8899 40 A-2
Valve Gp - Control 285-1531 41 E-5
Valve Gp - Solenoid / Press. Reducing 259-7430 42 E-4
NOTE A : CHECK PARTS MANUAL FOR IDENTIFICATION NUMBERS
Medium Pressure Attachment
Connector As - Orifice 148-8336 39 E-8
TAP LOCATION
Tap
Number
Description
Schematic
Location
AA Pump Pressure (Right Bank) B-3
BB Pump Pressure (Left Bank) A-3
CC Power Shift Pressure A-3
DD Pump Case drain A-2
EE Pilot Pressure B-1
FF Attachment Pilot Pressure (B2) E-4
GG Attachment Pilot Pressure (B1) E-4
HH Pump Pilot Pressure (B2) D-3
II Pump Pilot Pressure (A2 ) D-3
JJ Medium Pressure Pump Pressure F-5
SOS SOS (Scheduled Oil Sampling) B-1
©
2010 Caterpillar, All Rights Reserved
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
©
2010 Caterpillar, All Rights Reserved
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
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.
ATTACHMENT: MEDIUM PRESSURE
SCHEMATIC PART NUMBER: 285-1800, CHANGE: 00, VERSION: HE
MEDIA NUMBER: KENR6779-05
THIS SCHEMATIC IS FOR THE 345D AND 349D EXCAVATOR HYDRAULIC SYSTEM
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.
ATTACHMENT: MEDIUM PRESSURE
SCHEMATIC PART NUMBER: 285-1800, CHANGE: 00, VERSION: HE
MEDIA NUMBER: KENR6779-06
THIS SCHEMATIC IS FOR THE 345D AND 349D EXCAVATOR HYDRAULIC SYSTEM
12345678
A
B
C
D
E
F
12345678
A
B
C
D
E
F
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
PILOT PUMP OUTPUT
DRIVE PUMP OUTPUT
HEAVY LIFT CONTROL CIRCUIT
POWER SHIFT CONTROL CIRCUIT
HYDRAULIC OIL COOLING PUMP OUTPUT
SUPPLY LINE
STICK CONTROL AND STICK CYLINDER CIRCUIT
LEFT TRAVEL CONTROL AND LEFT TRAVEL MOTOR CIRCUIT
ATTACHMENT CONTROL CIRCUIT
SWING CONTROL AND SWING MOTOR CIRCUIT
DRAIN / RETURN LINE
SWING BRAKE CONTROL CIRCUIT
IDLER PUMP OUTPUT
TRAVEL SPEED CONTROL CIRCUIT
BUCKET CONTROL AND BUCKET CYLINDER CIRCUIT
RIGHT TRAVEL CONTROL AND RIGHT TRAVEL MOTOR CIRCUIT
BOOM CONTROL AND BOOM CYLINDER CIRCUIT
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
CALLOUTS
Taps (Pressure, Sampling, Sensor - by letter)
YY
(52) VALVE GP - CONTROL
138-1234
Callout Number
(Machine Location from
Component LocationsTable)
Component
Name
Part Number
(2) CYLINDER GP
BOOM
(4) CYLINDER GP
STICK
(3) CYLINDER GP
BUCKET
CV
CH CR
Pi DR
T
X
B
A
B
A
AG
AG
BG
BG
T2
T2
T1
T1
BR
BR
X
B
A
L
L
B
A
DR3 DR4 DR5 T-OUT1
DR6
DR2
T-OUT2
PSA1DR1
PSA2P-IN
P2
P1
1
2
3
4
5
6
7
SDr HL
Dr
X
R2
Pp1
Pp2
SPi2
SDr2 dSW dST1 PiH
Pi2
P1 P2
A1
B1
A2B2
TP
TT
JLP
JRP
JLT
JRT
PSW PTA
R3
Y
R1
A
B
A2
B2
MU1
MU2
PG2
DB2
DB1
PG1
DE2
Pi1
aL4
T
A4
B1
Dr1
Di
PS2
PB
D0
PS1
S
L1
L
X
B
a2
a5
a3
PSV
JL1
JL3
JL2
JL4
JR4
JR2
JR3
JR1
PAT
BL2
AL2
bL2
A1
B1
A2
A1
a1
a4
AL4BL4
aL5
SPi
T
OUT
PGPC
IN
AG1 BG1
AG2
BG2
1
2
3
4
5
6
1
2
3
4
5
6
T1 T2 T3 T4
STICK SWING BUCKET
BOOM
(OUT) (IN)
(R)
(L) (OPEN)(CLOSE) (DOWN)
(UP)
DE1
Pi1
Pi2
HR
AR4
µµµ µ
TRAVEL(L) TRAVEL(R)
(BACK)
(FWD)
(FWD)(BACK)
AR1BR1 AL1 BL1
PR
PL
PLPR
BR2AR2
BR3
aR4
aR3
AR3 BR2 AR2
bR2
BR1
AR1
bR1
bL3
bL1
BL1
AL1
AL3BL3
bR3
bR1
aR4bL3 bL4 aL3 aR3 bR2 bR3 aR2
aR1 aL1 bL1
aR2 aR1 aL1
aL3
bL5
bL5 PiL
PiL
DR1
L2
L3
A
B
AL3BL3
AR3BR3
TRAVEL(R)
TRAVEL(L)
STICK(1)
SWING
ATCH
BOOM(2)
(UP)
(DOWN)
BUCKET
(OPEN)
(CLOSE)(BACK)
(FWD)
BOOM(1)
(IN)
(OUT)
(FWD)
(BACK)
STICK(2)
(IN)
(OUT)
(R)
(L)
(UP)
NO.1
(TRAVEL)
NO.2
(SWING)
NO.3
(LOCK)
BB
AA
CC
DD
SOS
EE
FF
bL4
TRAVEL
IMPLEMENT
aL2
A
P
T
bR4
T
P
A1
B1
A2
B2
T
P
1 1
5 5
4
4
A1 B1A2 B2
A1
A2
A3
A4
A5
A6
A8
A7
B1
B2
B3
B4
B5
B6
B7
B8
GG
II
HH
PA1
PB1
T
A B
P
M
LS
MED-P
MED-P
JJ
(1) ACCUMULATOR GP
PILOT MANIFOLD
164-6981
(15) PUMP GP
DRIVE
(IDLER PILOT)
295-9663
(14) PUMP GP
COOLING FAN
295-9426
(7) FILTER GP
PILOT
158-8987
(5) FILTER GP
CASE DRAIN
289-8194
(6) FILTER GP
DRAIN RETURN
289-8194
(8) FILTER GP
RETURN
188-4145
(17) SENSOR GP
PUMP PRESSURE
260-2180
(18) SENSOR GP
PUMP PRESSURE
260-2180
(10) MOTOR GP
COOLING FAN
295-9429
(13) MOTOR GP
SWING
225-4506
(27) VALVE GP
CHECK
(SLOW RETURN)
285-1715
(27) VALVE GP
CHECK
(COOLER BYPASS)
123-2505
(38) VALVE GP
SWING MOTOR
295-9423
(12) VALVE GP
RIGHT TRAVEL/BRAKE
266-7843
(28) VALVE GP
SOLENOID
HEAVY LIFT
121-6303
(22) SWIVEL GP
225-4547
(12) MOTOR GP
RIGHT TRAVEL
232-6180
(11) MOTOR GP
LEFT TRAVEL
232-6180
(11) VALVE GP
LEFT
TRAVEL/BRAKE
266-7843
(37) VALVE GP
SHUTTLE
SWING PILOT
123-2430
(36) VALVE GP
SHUTTLE
BOOM / STICK
PILOT
123-2430
(26) VALVE GP
PRIORITY
BOOM/SWING
232-4102
(33) VALVE GP
PILOT CONTROL
TRAVEL
165-9522
(30) VALVE GP
LH PILOT CONTROL
STICK/SWING
270-5951
(19) SWITCH AS
PRESSURE
SWING PILOT
309-5769
(20) SWITCH AS
PRESSURE
BOOM UP / STICK IN
PILOT
309-5769
(34) VALVE GP
RH PILOT CONTROL
BUCKET/BOOM
270-5952
(21) SWITCH AS
PILOT
PRESSURE
106-0179
(42) VALVE GP
SOLENOID/
PRESSURE REDUCING
259-7430
(23) VALVE GP
CONTROL PUMP
297-0641
(25) VALVE GP
BOOM CONTROL
297-0595
(25) SENSOR GP
BOOM CYLINDER
HEAD PRESSURE
221-8859
(32) VALVE GP
PILOT MANIFOLD
215-5037
(31) VALVE GP
MAIN CONTROL
310-0101
(31) SENSOR AS
BOOM DOWN
PILOT PRESSURE
297-4483
(41) VALVE GP
CONTROL
285-1531
(40) PUMP GP
MEDIUM PRESSURE
136-8899
PB1
PA1
(39) CONNECTOR AS
ORIFICE
148-8336
DR
MACHINE COMPONENT LOCATIONS
38
34
34
33
33
31
31
30
30
28
28
27
27
26
26
25
25
23
23
22
22
21
21
19
19
18
18
17
17
15
15
13
13
13
12
12
11
11
10
10
8
8
7
7
6
6
5
5
4
4
3
2
2
2
1
1
VIEW ALL CALLOUTS
MAIN CONTROL / PILOT
STICK(2) BUCKET TRAVEL(R) TRAVEL(L) STICK(1)
BOOM(1) ATCH STR TRAVEL SWING BOOM(2)
AR4
AR2AR1
BR1 BR2
AL1AL2
BL1BL2BL3
AL3
AL4
BL4
X
AR3
PTA PSW
PiH
Y
BR3
39
37
3632
31
26
20
191
VIEW ALL CALLOUTS
MEDIUM PRESSURE
42 4140
JJ
GG
FF
VIEW ALL CALLOUTS
PUMPS AND FILTERS
1514
SOS
II
HH CC
7
7
6
5
EEDDBB AA
VIEW ALL CALLOUTS
