CAT 345D Excavator Hydraulic System Attachment Boom Lowering Control Valve

INTERACTIVE SCHEMATIC
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©
2010 Caterpillar, All Rights Reserved
Printed in U.S.A.
KENR6789-03
December 2010
Boom Lowering Control Valve
345D Excavator
Hydraulic System - Attachment
BYC1-UP
RAE1-UP
YEE1-UP
NEG1-UP
EEH1-UP
RAJ1-UP
MLK1-UP
PBT1-UP
COMPONENT LOCATION
Sensor Gp - Pressure, Boom Cyl. Head 221-8859 40 F-4
Valve Gp - Boom Control, Pilot 297-0596 41 E-3
Valve Gp - Check/ Relief, Boom 298-7672 42
NOTE A : CHECK PARTS MANUAL FOR IDENTIFICATION NUMBERS
Attachment - Boom Lowering Control
Description
Part
Number
Machine
Location
Schematic
Location
Accumulator Gp - Pilot Man. 164-6981 1 C-1
Cylinder Gp - Boom Note A 2 F-3
Cylinder Gp - Bucket Note A 3 F-5
Cylinder Gp - Stick Note A 4 F-5
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
Motor Gp - Cooling Fan 295-9429 9 A-4
Motor Gp - Left Travel 232-6180 10 B-8
Motor Gp - Right Travel 232-6180 11 B-7
Motor Gp - Swing 225-4506 12
Pump Gp - Cooling Fan 295-9426 14 A-3
Pump Gp - Drive, Idler, Pilot 295-9663 15 A-2
Sensor Gp - Pressure, Boom Dn Pilot 297-4483 16 C-4
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 19 E-7
Switch As - Press., Implmnt, Trvl Pilot 106-0179 20
Switch As - Pressure, Swing Pilot 309-5769 21 E-8
Swivel Gp 225-4547 22 A-7
Valve Gp - Check, Cooler Bypass 123-2505 23 B-4
Valve Gp - Check, Slow Return 285-1715 24 B-5
Valve Gp - Heavy Lift 121-6303 25 B-5
Valve Gp - Left, Travel/Brake 266-7843 26 A-8
Valve Gp - LH Pilot Control, Stck/Swng 270-5951 27 F-6
Valve Gp - Main Control 310-0101 28
Valve Gp - Pilot Manifold 215-5037 29 C-2
Valve Gp - Pilot, Pump 171-0188 30 D-2
Valve Gp - Pilot Control. Travel 165-9522 31 F-8
Valve Gp - Priority, Boom/Swing 232-4102 32 E-7
Valve Gp - RH Pilot Control, Bckt/Boom 270-5952 33 F-6
Valve Gp - Right, Travel/brake 266-7843 34 A-7
Valve Gp - Shuttle, Stick Pilot 123-2430 35 E-7
Valve Gp - Shuttle, Swing Pilot 123-2430 36 E-8
Valve Gp - Swing Motor 295-9423 37 A-6
Connector As - Orifice 148-8336 13 E-8
C-1
B-6
D-6
C-5
F-4
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 Pump Pilot Pressure D-2
SOS SOS (Scheduled Oil Sampling) B-1
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
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
DRIVE PUMP OUTPUT
IDLER PUMP OUTPUT
POWER SHIFT CONTROL CIRCUIT
PILOT PUMP OUTPUT
HYDRAULIC OIL COOLING PUMP OUTPUT
ATTACHMENT CONTROL 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
BOOM CONTROL AND BOOM CYLINDER CIRCUIT
HEAVY LIFT CONTROL CIRCUIT
LEFT TRAVEL CONTROL AND LEFT TRAVEL MOTOR CIRCUIT
SWING CONTROL AND SWING MOTOR CIRCUIT
SWING BRAKE CONTROL CIRCUIT
12345678
A
B
C
D
E
F
12345678
A
B
C
D
E
F
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.
THIS SCHEMATIC IS FOR THE 345D EXCAVATOR
ATTACHMENT: BOOM LOWERING CONTROL VALVE
PART NUMBER: 297-0253, CHANGE: 00, VERSION: HE
TRAVEL MOTOR (LEFT) TRAVEL MOTOR (RIGHT)
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
bR4
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
(1) ACCUMULATOR GP
PILOT MANIFOLD
164-6981
A4
B1
Dr1
Di
PS2
PB
D0
PS1
S
L1
L
X
B
a2
a5
a3
PSV
A1
A2
A3
A4
A5
A6
A8
A7
B1
B2
B3
B4
B5
B6
B7
B8
JL1
JL3
JL2
JL4
JR4
JR2
JR3
JR1
PAT
aL2
BL2
AL2
bL2
A1
B1
A2
A1
a1
a4
AL4BL4
aL5
SPi
T
OUT
PGPC
IN
SWING MOTOR
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
SWING MOTOR
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 aL3 aR3 bR2 bR3 aR2
aR1 aL1 bL1
aR2 aR1 aL1
aL3
bL5
bL5 PiL
PiL
DRDR1
L2
L3
A
B
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)
(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
(29) VALVE GP
PILOT MANIFOLD
215-5037
(9) MOTOR GP
COOLING FAN
295-9429
(24) VALVE GP
CHECK
SLOW RETURN
285-1715
(35) VALVE GP
SHUTTLE
BOOM / STICK
PILOT
123-2430
(32) VALVE GP
PRIORITY
BOOM / SWING
232-4102
(31) VALVE GP
PILOT CONTROL
TRAVEL
165-9522
(27) VALVE GP
LH PILOT CONTROL
STICK / SWING
270-5951
(33) VALVE GP
RIGHT PILOT CONTROL
BUCKET / BOOM
270-5952
(20) SWITCH AS
PRESSURE PILOT
106-0179
(28) VALVE GP
MAIN CONTROL
310-0101
BB
AA
(17) SENSOR GP
PUMP PRESS.
260-2180
(18) SENSOR GP
PUMP PRESS.
260-2180
CC
DD
SOS
EE
bL4
(25) VALVE GP
SOLENOID
HEAVY LIFT
121-6303
TRAVELIMPLEMENT
(30) VALVE GP
PILOT, PUMP
171-0188
FF
B1
A2
B2
T
P
A1
CV
CH
Pi DR
T
CYL
X
Dr
CV
Pi
T
X
T
Pi
CV
Dr
X
CYL
X
BL3AL3
BR3
1
1
5
5
(41) VALVE GP
PILOT, BOOM CONTROL
297-0596
(40) SENSOR GP
PRESSURE
BOOM CYL. HEAD
221-8859
(42) VALVE GP
CHECK / RELIEF
298-7672
CR
(16) SENSOR GP
PRESSURE
BOOM DOWN PILOT
297-4483
BR2
AR3
bL4
(36) VALVE GP
SHUTTLE
SWING PILOT
123-2430
(21) SWITCH AS
PRESSURE
SWING PILOT
309-5769
(19) SWITCH AS
PRESSURE
BOOM UP / STICK IN
PILOT
309-5769
(13) CONNECTOR AS
ORIFICE
148-8336
(10) MOTOR GP
LEFT TRAVEL
232-6180
(26) VALVE GP
LEFT TRAVEL/BRAKE
266-7843
(22) SWIVEL GP
225-4547
(11) MOTOR GP
RIGHT TRAVEL
232-6180
(34) VALVE GP
RIGHT TRAVEL/BRAKE
266-7843
(37) VALVE GP
SWING MOTOR
295-9423
(12) MOTOR GP
SWING
225-4506
(23) VALVE GP
CHECK COOLER BYPASS
123-2505
(4) CYLINDER GP
STICK
(3) CYLINDER GP
BUCKET
(2) CYLINDER GP
BOOM
(52) VALVE GP - CONTROL
138-1234
Callout Number
(Machine Location from
Component Locations Table
Component
Name
Part Number
BOOM LOWERING CONTROL
42
42
41
40
2
VIEW ALL CALLOUTS
MAIN CONTROL - PILOT
AR4
AR2AR1
BR1 BR2
AL1AL2
BL1BL2BL3
AL3
AL4
BL4
X
AR3
STICK(2) BUCKET TRAVEL(R) TRAVEL(L) STICK(1)
PTA PSW
PiH
BOOM(1) ATCH STR TRAVEL SWING BOOM(2)
Y
BR3
36
35 3229 28 211916 131
VIEW ALL CALLOUTS
PUMPS AND FILTERS
SOSFF EEDD CCBB AA
1514
7
7
6
5
VIEW ALL CALLOUTS

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