UENR3641
October 2012
Volume 2 of 2: Heavy Lift
349F Excavator (Pilot)
Hydraulic System
BZ21-UP
KEA1-UP
WNA1-UP
HLB1-UP
TEE1-UP
YEG1-UP
A9J1-UP
KBP1-UP
TEW1-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
UENR3641
30 Page, (Dimensions: 39 inches x 28 inches)
Volume 2 of 2: Heavy Lift Version
Volume 1 of 2: Standard Version
PRELIMINARY
UENR3641 VOL 1 of 2
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.
SCHEMATIC PART NUMBER: 323-7854, CHANGE: 05, VERSION: HE
THIS SCHEMATIC IS FOR THE 349F EXCAVATOR (PILOT) HYDRAULIC SYSTEM
MEDIA NUMBER: UENR3641 VOLUME 1 OF 2
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
22 HEAVY LIFT SOL
21 SWING PRIORITY SOL
20 HYD LOCK SOL
19 STRAIGHT TRAVEL SOL
18 TRAVEL SPEED CHANGE SOL
17 SWING BREAK SOL
16 NFC 2 LIMIT EPRV
15 NFC 1 LIMIT EPRV
13 BOOM REGEN REPRV
12 PS PRESS EPRV
11 PUMP 2 PRESS SENSOR
10 PUMP 1 PRESS SENSOR
9 NFC 2 PRESS SENSOR
8 NFC 1 PRESS SENSOR
7 BOOM CYLINDER HEAD PRESS SENSOR
6 SWING CONTROL PRESS SENSOR
5 BOOM DOWN CONTROL PRESS SENSOR
3 IMPLEMENT PRESS SWITCH
2 RIGHT TRAVEL PRESS SW
1 LEFT TRAVEL PRESS SW
IDENT CONNECTOR
N
O
T
E
ITEM QTY
MEAS
UNIT
PART NO. NAME
MISC REF
- - 158-8987 FILTER GP
- - 164-6981 ACCUMULATOR GP
- - 188-4145 FILTER GP
- - 215-5037 VALVE GP
- - 225-4547 SWIVEL GP
- - 266-7843 VALVE GP
- - 289-8194 FILTER GP
- - 295-9422 VALVE GP
- - 310-0107 VALVE GP
B - - 310-0252 VALVE GP
- - 323-7560 VALVE GP
C - - 323-7655 VALVE GP
- - 323-7671 VALVE GP
B - - 323-7894 VALVE GP
C - - 323-7895 MANIFOLD GP
- - 323-7947 VALVE GP
- - 323-7948 VALVE GP
- - 334-9975 MOTOR GP
- - 349-4066 PUMP GP
D - - 352-6860 ACCUMULATOR GP
- - 352-7016 VALVE GP
- - 352-7065 VALVE GP
- - 355-5669 MOTOR GP
- - 369-8367 VALVE GP
- - 369-8502 VALVE GP
323-7854
???? ????
VALVE GP
310-0252
ACCUMULATOR GP
164-6981
352-6860 NOTE D
VALVE GP
352-7065
VALVE GP
323-7948
VALVE GP
323-7947
VALVE GP
369-8502
VALVE GP
215-5037
VALVE GP
323-7560
VALVE GP
323-7671
MOTOR GP
334-9975
VALVE GP
266-7843
MOTOR GP
355-5669
SWIVEL GP
225-4547
VALVE GP
266-7843
MOTOR GP
355-5669
MOTOR GP
334-9975
FILTER GP
188-4145
FILTER GP
289-8194
FILTER GP
289-8194
VALVE GP
310-0107
FILTER GP
158-8987
PUMP GP
349-4066
6
8
9
20
17
18
13
16
15
12
5
3
2
1
VALVE GP
323-7894
???? ????
VALVE GP
352-7016
VALVE GP
352-7016
VALVE GP
295-9422
????
???? ???? ????
7
????
NOTE A: CONNECT aR2 AND bR2
NOTE A
NOTE A
???? ???? ????
NOTE C: FOR HEAVY LIFT SEE VOLUME 2
NOTE B: FOR STANDARD SEE VOLUME 1
???? ???? ???? ???? ???? ???? ???? ???? ???? ???? ???? ???? ???? ???? ???? ????
1011
19
21
NOTE D: FOR CANADA BC/AL REGULATION
???? ????
VALVE GP
369-8367
BOOM CYLINDERSTICK CYLINDER
BUCKET CYLINDER
T
OUT
PG
PC
IN
T
B2
B1
A2
A1
P
Ps2
Pi2
D1
Ps1
B1
Dr1
Psv
a1
a3
a2
A1
A2
A4
D0
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
A
B
MU1
DB1
PG1
A1
B1
SWING MOTOR
AG1
BG1
DE1
A2
B2
MU2
PG2
DB2
DE2
AG2
BG2
SWING MOTOR
TP
TT
TRAVEL (L)
TRAVEL (R)
(FWD)
(BKWD)
(FWD)
(BKWD)
T1
T5
T2
T4
T6
T3
(OUT) (IN) (R)
(L)
(CLOSE)(OPEN)
(DOWN) (UP)
JLP
JLT
JRP
JRT
BOOM
BUCKET
STICK
SWING
JL1 JL3 JL2 JL4 JR4
JR2 JR3JR1
1
1
2
2
3
3
4
4
5
5
6
6
P
DR6
T-OUT1
DR5
Pi2
DR4
DR3
P2
P-IN
PSA2
DR1
PSA1
DR2
T-OUT2
Pi1
PAC
A
2 SPEED
TRAVEL
CONTROL
2 SPEED
TRAVEL
CONTROL
SWG
PRKG BK
CONTROL
SWG
PRKG BK
CONTROL
DRAIN
FILTER
DRAIN
FILTER
T
Ps
P1
Pi1
(FWD)
(BKWD)
(FWD)(BKWD)
(R)
(L)
P
A
B
T
A
G
F
E
D
C
B
BP3
BRDr1
AR2
BR2
SP3
SP1
ST
BP1
BT
BDr
HPi
P1S
P2S
AR3 BL3
HL
HR
BR4
BR3
R.C.V-G
BP2
SP2
P1
P2
BL1AL1 AR1 BR1
AL2BL2
MU
aR5
bR5
aL4
aR3 bR3
BPi
aR4
bL2
aL2
bR4
bL3
aL3 SPi
bR1aR1aL1bL1
SRPi
bL4
BRPi
????
STDr
STPi
PD-Pi PD-Dr
PD-Pi
PD-Dr
A1 A2 A3 A4 A5 A6 A7 A8
B1 B2 B3 B4 B5 B6 B7 B8C1 C2 C3 C4
dST
BDrSRDr
SOL1-T
SOL1-T
BRDr2
SWDr
R.C.V-G
R.C.V-B
HR
bR4 bR5
AL2BL2
BR4
BP2
BR3 AR3
aR3
bR3
aL1
bL1
aL2
bL2
AL1
BL1
aR1
bR1
BR1AR1
STICK(2)
BOOM(1)
ATCH
BUCKET
TRAVEL(R)
TRAVEL(L)
SWING
STICK(1)
(IN)
(OUT)
(R)
(L)
(FWD)
(BKWD)
(FWD)
(BKWD)
(OPEN)
(CLOSE)
(DOWN)
(UP)
(IN)
(OUT)
BOOM(2)
(STICK-IN)
(UP)
AL3
ST
BT
AR4
BL3
(RET)
(EXT)
T
R1
STR-TRAVEL
SP2
BL3
bL3
aL3
bL4 SRPi
aR5
MU
R.C.V-B
AR5BR5
AL4
AR5
SPi
aR4
BRPi
AL4
BPi
BR5
STPi
STDr
P2 P1
HL
aR2
bR2
SDr
BDrSDr
SWDrSRDr BRDr2
dST
aL4
SDr
PRELIMINARY
UENR3641 VOL 2 of 2
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.
SCHEMATIC PART NUMBER: 323-7854, CHANGE: 05, VERSION: HE
THIS SCHEMATIC IS FOR THE 349F EXCAVATOR (PILOT) HYDRAULIC SYSTEM
MEDIA NUMBER: UENR3641 VOLUME 2 OF 2
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
VALVE GP
323-7655
ACCUMULATOR GP
164-6981
352-6860 NOTE D
VALVE GP
352-7065
VALVE GP
323-7948
VALVE GP
323-7947
VALVE GP
369-8502
VALVE GP
215-5037
VALVE GP
323-7560
VALVE GP
323-7671
MOTOR GP
334-9975
VALVE GP
266-7843
MOTOR GP
355-5669
SWIVEL GP
225-4547
VALVE GP
266-7843
MOTOR GP
355-5669
MOTOR GP
334-9975
FILTER GP
188-4145
FILTER GP
289-8194
FILTER GP
289-8194
VALVE GP
310-0107
FILTER GP
158-8987
PUMP GP
349-4066
6
8
9
20
17
18
13
16
15
12
5
3
2
1
MANIFOLD GP
323-7895
VALVE GP
352-7016
VALVE GP
352-7016
VALVE GP
295-9422
7
22
NOTE A
NOTE A
FOR NOTES SEE VOLUME 1
???? ???? ???? ???? ???? ???? ????
1011
19
21
???? ????
VALVE GP
369-8367
BOOM CYLINDERSTICK CYLINDER
BUCKET CYLINDER
T
OUT
PG
PC
IN
Pi1
Ps2
Pi2
D1
Ps1
B1
Dr1
Psv
a1
a3
a2
A1
A2
A4
D0
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
A
B
MU1
DB1
PG1
A1
B1
SWING MOTOR
AG1
BG1
DE1
A2
B2
MU2
PG2
DB2
DE2
AG2
BG2
SWING MOTOR
TP
TT
TRAVEL (L)
TRAVEL (R)
(FWD)
(BACK)
(FWD)
(BACK)
T1
T5
T2
T4
T6
T3
(OUT) (IN) (R)
(L)
(CLOSE)(OPEN)
(DOWN) (UP)
JLP
JLT
JRP
JRT
BOOM
BUCKET
STICK
SWING
JL1 JL3 JL2 JL4 JR4
JR2
JR3
JR1
1
1
2
2
3
3
4
4
5
5
6
6
P1
P2
DR6
T-OUT1
DR5
Pi2
DR4
DR3
P1
P2
P-IN
PSA2
DR1
PSA1
DR2
T-OUT2
Pi1
PAC
A1
A2
2 SPEED
TRAVEL
CONTROL
2 SPEED
TRAVEL
CONTROL
SWG
PRKG BK
CONTROL
SWG
PRKG BK
CONTROL
DRAIN
FILTER
DRAIN
FILTER
T
T
B2
B1
A2
A1
P
Ps
(FWD)
(BKWD)
(FWD)(BKWD)
P
A
B
T
A
G
F
E
D
C
B
BP3
BRDr1
AR2
BR2
SP3
SP1
ST
BP1
BT
BDr
P1S
P2S
(R)
(L)
AR3 BL3
BR4
BR3
R.C.V-G
BP2
SP2
P1
P2
BL1AL1 AR1 BR1
AL2BL2
MU
aR5aL4
aR3 bR3
BPi
aR4
bL2
aL2
bR4
bL3
aL3 SPi
bR1aR1aL1bL1
SRPi
bL4
BRPi
????
A1 A2 A3 A4 A5 A6 A7 A8
B1 B2 B3 B4 B5 B6 B7 B8C1 C2 C3 C4
STDr
STPi
PD-Pi PD-Dr
PD-Pi
PD-Dr
HPi
HL
HR
dST
BDrSRDr
SOL1-T
SOL1-T
BRDr2
SWDr
bR5
R.C.V-G
R.C.V-B
HR
bR4 bR5
AL2BL2
BR4
BP2
BR3 AR3
aR3
bR3
aL1
bL1
aL2
bL2
AL1
BL1
aR1
bR1
BR1AR1
STICK(2)
BOOM(1)
ATCH
BUCKET
TRAVEL(R)
TRAVEL(L)
SWING
STICK(1)
(IN)
(OUT)
(R)
(L)
(FWD)
(BKWD)
(FWD)
(BKWD)
(OPEN)
(CLOSE)
(DOWN)
(UP)
(IN)
(OUT)
BOOM(2)
(STICK-IN)
(UP)
AL3
ST
BT
AR4
BL3
(RET)
(EXT)
T
R1
STR-TRAVEL
SP2
BL3
bL3
aL3
bL4 SRPi
aR5
MU
R.C.V-B
AR5BR5
AL4
AR5
SPi
aR4
BRPi
AL4
BPi
BR5
STPi
STDr
P2 P1
HL
aR2
bR2
SDr
BDrSDr
SWDrSRDr BRDr2
dST
aL4
HPi
SDr
