KENR6780-03
March 2012
Quick Coupler
345D and 349D Excavator
Hydraulic System - Attachment
345D:
BYC1-UP
RAE1-UP
YEE1-UP
NEG1-UP
EEH1-UP
RAJ1-UP
PBT1-UP
349D:
WTD-1UP
NNF1-UP
MEN1-UP
Printed in U.S.A.© 2012 Caterpillar, All Rights Reserved
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)
PUMP
(2 - SECTION)
SPRING
(ADJUSTABLE)
VARIABILITY LINE RESTRICTION
(VARIABLE)
PRESSURE
COMPENSATION
PUMP
(VARIABLE & PRESSURE
COMPENSATED)
MEASUREMENT
PRESSURE TEMPERATURE FLOW
ROTATING SHAFTS
UNIDIRECTIONAL BIDIRECTIONAL
PUSH - PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
VALVE ENVELOPES VALVE PORTS
FLUID CONDITIONERPUMP OR MOTOR
FLUID POWER SYMBOLS
UNIDIRECTIONAL
BIDIRECTIONAL
RELEASED PRESSURE
EXTERNAL RETURN INTERNAL RETURN
REMOTE SUPPLY PRESSURE
SIMPLIFIED
HYDRAULIC PUMPS
ACCUMULATORS
SPRING LOADED GAS CHARGED
SOLENOID
OR MANUAL
SOLENOID
& PILOT
SOLENOID &
PILOT OR MANUAL
SOLENOID SERVO THERMAL DETENT
HYDRAULIC & PNEUMATIC CYLINDERS
DOUBLE ACTINGSINGLE ACTING
BASIC
SYMBOL
SPRING
LOADED
CHECK VALVES
2 POSITION
INFINITE
POSITIONING
FLOW IN ONE
DIRECTION
FLOW IN
EITHER
DIRECTION
3 POSITION
CROSS
FLOW
PARALLEL
FLOW
INTERNAL PASSAGEWAYS
NORMAL POSITION
AB
PT
AB
PT
SHIFTED POSITION INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOT
CONTROLLED
MAIN AUX
LINE RESTRICTION
(VARIABLE & PRESSURE
COMPENSATED)
MANUAL CONTROL SYMBOLS
HYDRAULIC MOTORS
FLUID STORAGE RESERVOIRS
CROSSING & JOINING LINES
VALVES
PILOT CONTROL SYMBOLS
COMBINATION CONTROLS
BASIC COMPONENT SYMBOLS
ENERGY TRIANGLES
HYDRAULIC PNEUMATIC
INTERNAL
SUPPLY PRESSURE
COMPLETE
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
HYDRAULIC SYMBOLS (ELECTRICAL)
ELECTRICAL SYMBOLS TABLE
325-AG135 PK-14
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
WIRE
WIRE
(EXAMPLE VALVE)
CURRENT STANDARD
TRANSDUCER
(FLUID)
M
ELECTRIC MOTORTRANSDUCER
(GAS / AIR)
G
GENERATOR
PRESSURE SWITCH ELECTRICAL WIREPRESSURE SWITCH
(ADJUSTABLE)
TEMPERATURE
SWITCH
PRESSURE
SWITCH
TEMPERATURE
SWITCH
LEVEL
SWITCH
FLOW
SWITCH
ELECTRICAL SYMBOLS (ELECTRICAL)
A
CIRCUIT NUMBER
IDENTIFICATION
WIRE
COLOR
WIRE GAUGE
T
KENR6780-03
30 Page, (Dimensions: 39 inches x 28 inches)
COMPONENT LOCATIONS
PUMPS and FILTERS
31
31
1
1
24
3
24
2
19
19
15
15
23
23
11
12
11
12
18
17
18
17 6
6
10
10
27
27
25
2513
13
38
14
21
21
22
22
30 34
30 34 33
33
8
8
5
5
7
5
6
BB EE DD FF AA SOS EE
7
7
7
15
26
26
13
MAIN CONTROL / PILOT
1263637 2032
19
31
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)
HEAVY LIFT
40
1
32
32
31
31
QUICK COUPLER
50
BB
Tap Locations
Pressure and Sampling
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-3
SOS SOS (Scheduled Oil Sampling) B-1
Y
BR3
Description
Part
Number
Machine
Location
Schematic
Location
Accumulator Gp - Pilot Man. Note A 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 E-4
Filter Gp - Case Drain Note A 5 B-2
Filter Gp - Drain Return Note A 6 C-2
Filter Gp - Pilot Note A 7 B-1
Filter Gp - Return Note A 8 C-1, C-2
Motor Gp - Cooling Fan Note A 10 B-4
Motor Gp - Left Travel Note A 11 B-8
Motor Gp - Right Travel Note A 12 B-7
Motor Gp - Swing Note A 13 A
-5, B-6
Pump Gp - Cooling Fan Note A 14 A-3
Pump Gp - Drive, Idler, Pilot Note A 15 A-2
Sensor Gp - Pressure, Bm Dn Pilot Note A 31 C-4
Sensor Gp - Pressure, Pump Note A 17 A-3
Sensor Gp - Pressure, Pump Note A 18 B-3
Sensor Gp - Pressure, Boom Cyl. Head Note A 25 F-3
Switch As - Pressure, Swing Pilot Note A 19 E-8
Switch As - Press., Bm Up/Stck In Pilot Note A 20 E-7
Switch As - Press., Implmnt, Trvl Pilot Note A 21 D-5, D-6
Swivel
Gp Note A 22 A-7
Valve Gp - Pilot, Pump Note A 23 D-3
Valve Gp - Boom Control Note A 25 E-3
Valve Gp - Priority, Boom/Swing Note A 26 E-8
Valve Gp - Check, Clr Bypass Note A 27 B-4
Valve Gp - Check, Slow Return Note A 27 B-5
Valve Gp - Left, Travel/Brake Note A 11 A-8
Valve Gp - LH Plt Cntrl, Stck/Swng Note A 30 F-6
Valve Gp - Main Control Note A 31 C-3 To D-8
Valve Gp - Pilot Manifold Note A 32 C-2
Valve Gp - Plt Contr. Travel Note A 33 F
-7
Valve Gp - RH Plt Cntrl, Bckt/Bm Note A 34 F-6
Valve Gp - Right, Travel/brake Note A 12 A-7
Valve Gp - Shuttle, Stick Pilot Note A 36 E-7
Valve Gp - Shuttle, Swing Pilot Note A 37 E-8
Valve Gp - Swing Motor Note A 38 A-6
Valve GP - Heavy Lift Note A 40 B-5
Valve GP - Solenoid and Manifold 328-2035 50 E-6
NOTE A : Check Parts Manual for your specific machine.
Component Locations
Attachment - Quick Coupler
Heavy Lift
39
KENR6780-03
30 Page, (Dimensions: 39 inches x 28 inches)
Components are shown installed on a fully operable machine with the key and engine off, transmission shifter
in neutral and with parking brake set.
Refer to the appropriate Service Manual for Troubleshooting, Specifications and Systems Operations.
ATTACHMENT: UNIVERSAL QUICK COUPLER
SCHEMATIC PART NUMBER: 329-6237, CHANGE: 00, VERSION: -/HE
MEDIA NUMBER: KENR6780-03
THIS SCHEMATIC IS FOR THE 345D AND 349D HYDRAULIC SYSTEM
12345678
A
B
C
D
E
F
12345678
A
B
C
D
E
F
DRAIN / RETURN LINE
LINES GROUP 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 & BUCKET CYLINDER CIRCUIT
RIGHT TRAVEL CONTROL & RIGHT TRAVEL MOTOR CIRCUIT
TRAVEL SPEED CONTROL CIRCUIT
STICK CONTROL & STICK CYLINDER CIRCUIT
BOOM CONTROL & BOOM CYLINDER CIRCUIT
HEAVY LIFT CONTROL CIRCUIT
LEFT TRAVEL CONTROL & LEFT TRAVEL MOTOR CIRCUIT
SWING CONTROL & SWING MOTOR CIRCUIT
SWING BRAKE CONTROL CIRCUIT
QUICKCOUPLER CIRCUIT
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
BOOM CYLINDER
STICK CYLINDER
BUCKET CYLINDER
CV
CH CR
Pi DR
T
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
SWIVEL GP
225-4547
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
AB
A2
B2
MU1
MU2
PG2
DB2
DB1
PG1
DE2
Pi1
aL4
T
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
μμμμ
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
DR 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)
PUMP GP
DRIVE, IDLER
PILOT
295-9663
PUMP GP
COOLING FAN
295-9426
FILTER GP
PILOT
158-8987
FILTER GP
CASE DRAIN
289-8194
FILTER GP
DRAIN
RETURN
289-8194
FILTER GP
RETURN
188-4145
VALVE GP
PILOT MANIFOLD
215-5037
MOTOR GP
COOLING FAN
295-9429
MOTOR GP
SWING
225-4506
VALVE GP
CHECK
SLOW RETURN
285-1715
VALVE GP
CHECK
CLR BYPASS
123-2505
MOTOR GP
SWING
225-4506
VALVE GP
SWING MOTOR
295-9423
VALVE GP
RIGHT
TRAVEL/BRAKE
266-7843
MOTOR GP
RIGHT TRAVEL
232-6180
MOTOR GP
LEFT TRAVEL
232-6180
VALVE GP
LEFT
TRAVEL/BRAKE
266-7843
VALVE GP
SHUTTLE
BOOM / STICK
PILOT
123-2430
VALVE GP
PRIORITY
BOOM/SWING
232-4102
VALVE GP
PILOT CONTROL
TRAVEL
165-9522
VALVE GP
LH PILOT CONTROL
STICK/SWING
270-5951
VALVE GP
RH PILOT CONTROL
BUCKET/BOOM
270-5952
SWITCH AS
PRESSURE
PILOT
106-0179
VALVE GP
MAIN CONTROL
310-0101
BB
AA
SENSOR AS
PUMP PRESS.
260-2180
SENSOR AS
PUMP PRESS.
260-2180
CC
DD
SOS
EE
FF
VALVE GP
PILOT, PUMP
171-0188
VALVE GP
CONTROL
BOOM
297-0595
bL4
VALVE GP
SOLENOID
HEAVY LIFT
121-6303
SENSOR AS
PRESSURE,
BOOM DOWN
PILOT
297-4483
TRAVEL
IMPLEMENT
SENSOR AS
PRESSURE
BOOM
CYL. HEAD
221-8859
T
P
A1
B1
A2
B2
VALVE GP
SOLENOID AND MANIFOLD
(QUICKCOUPLER)
328-2035
P
T
C1 C2
UNLOCK
LOCK
VALVE GP
SHUTTLE
SWING PILOT
123-2430
SWITCH AS
PRESSURE
SWING PILOT
309-5769
SWITCH AS
PRESSURE
BM UP / STICK IN
PILOT
309-5769
CONNECTOR AS
ORIFICE
148-8336
