INTERACTIVE SCHEMATIC
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UENR0428
May 2012
Two-Way / One Pump - Electric Control
349E Excavator
Hydraulic System - Attachment
DGE1-UP
TFG1-UP
KCN1-UP
MPZ1-UP
©
2012 Caterpillar, All Rights Reserved
Printed in U.S.A.
COMPONENT LOCATION
Description
Part
Number
Machine
Location
Schematic
Location
349E STANDARD
Accumulator Gp - Hydraulic (Charged) (Standard) 164-6981
Accumulator Gp - Hydraulic (Canada BC/AL Reg.) 352-6860
Control Gp - Joystick (LH) 335-0511 2
D-7
Control Gp - Joystick (RH) 335-0510 3 D-6
Cylinder Gp - Boom 358-8439 4 F-2
Cylinder Gp - Bucket 358-8482 5 E-2
Cylinder Gp - Stick 358-8461 6 D-2
Filter and Valve Gp - Pilot (Hydraulic Oil) 158-8987 7 B-2
Filter Gp - Oil (Hydraulic Return) 188-4145 8 A-3
Filter Gp - Oil (Hydraulic, Case Drain) 289-8194 9 A-3
Manifold Gp - Control (Pilot Oil Supply) 215-5037 10 B-4
Motor Gp - Swing (LH) 334-9975 11 A-5
Motor Gp - Swing (RH) 334-9975 12 B-6
Motor Gp - Travel (Left) 335-5669 13 B-8
Motor Gp - Travel (Right) 335-5669 14 B-7
Pump Gp - Piston (Main Hydraulic) 349-4066 15 D-2
Screen Gp - Hydraulic 326-4434 16 A-2
Sensor Gp - Pressure (Boom Down Ctrl) 338-6970 17 C-7
Sensor Gp - Pressure (Boom, Head End) 338-6971 18 F-1
Sensor Gp - Pressure (Negative Flow Control 1) 338-6970 19 C-4
Sensor Gp - Pressure (Negative Flow Control 2) 338-6970 20 C-4
1 A-3
Sensor Gp - Pressure (Overload Warning) 338-6971 21 E-5
Sensor Gp - Pressure (Overload Warning) 338-6971 22 E-6
Sensor Gp - Pressure (Swing Control) 338-6970 23 C-6
Switch As - Pressure (Implement) 319-4407 24 C-7
Switch As - Pressure (Left Travel) 319-4407 25 C-5
Switch As - Pressure (Right Travel) 319-4407 26 C-5
Swivel Gp 225-4547 27 A-7
Tank and Filter Gp - Hydraulic 330-2497 28 A-3
Valve Gp - Boom Drift Reduction 352-7016 29 F-4
Valve Gp - Check 352-7071 30 F-7
Valve Gp - Check (Return) 323-7671 31 F-7
Valve Gp - Crossover Relief (Swing Cushion) 295-9422 32 A-6
Valve Gp - Main Control (Heavy Lift) 323-7658 33 E-4
Valve Gp - Pilot Travel (With Shuttle) 323-7762 34 D-5
Valve Gp - Pump Control 310-0107 35 C-4
Valve Gp - Shuttle 323-7560 37 C-7
Valve Gp - Solenoid and Pressure Reducing 323-7894 38 D-8
Valve Gp - Pressure Reducing (Boom Priority) 148-6218 36 C-6
Valve Gp - Stick Drift Reduction 352-7016 39 F-7
Valve Gp - Travel Counterbalance (Left) 266-7843 40 A-8
Valve Gp - Travel Counterbalance (Right) 266-7843 41 A-7
Valve Gp - Relief 239-8984 42 E-5
Valve Gp - Solenoid (Pressure Reducing) 259-7430 43 C-5
Attachment: Two-Way / One Pump
Check Part Numbers in the Parts Manuals for your Specific Machine
TAP LOCATION
Tap
Number
Description
Schematic
Location
Do Pump Case Pressure D-3
a1 Drive Pump Delivery Pressure D-2
a3 Power Shift Pressure C-2
a2 Idler Pump Delivery Pressure C-2
A2 Drive Pump Negative Flow Press. (NFC1) C-4
B2 Idler Pump Negative Flow Press. (NFC2) C-4
PG Pilot Pump Delivery Pressure B-2
SOS Oil Sampling Port B-2
EE Boom Regeneration Valve Pressure
bR2, Attachment Extend Pilot Press. (B1)
bF1, Attachment Extend Pilot Press. (B2)
C-8
AA C-5
BB C-5
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
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: TWO-WAY / ONE PUMP - ELECTRIC CONTROL
SCHEMATIC PART NUMBER: 237-7837, CHANGE: 01, VERSION: HE
MEDIA NUMBER: UENR0428
THIS SCHEMATIC IS FOR THE 349E EXCAVATOR HYDRAULIC SYSTEM
12345678
A
B
C
D
E
F
12345678
A
B
C
D
E
F
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Attachment
Air Line
CALLOUTS
Taps (Pressure, Sampling, Sensor - by letter)
YY
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
SWING BRAKE CONTROL CIRCUIT
IDLER PUMP OUTPUT
POWERSHIFT CONTROL CIRCUIT
SUPPLY LINE
STICK CONTROL AND STICK CYLINDER CIRCUIT
LEFT TRAVEL CONTROL AND LEFT TRAVEL MOTOR CIRCUIT
ATTACHMENT CIRCUIT
SWING CONTROL AND SWING MOTOR CIRCUIT
DRAIN / RETURN LINE
DRIVE 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
PILOT PUMP OUTPUT
(16) SCREEN GP
HYDRAULIC
326-4434
NFC1 LIMIT
EPRV
NFC2 LIMIT
EPRV
(30) VALVE GP
CHECK
352-7071
(35) VALVE GP
PUMP CONTROL
310-0107
(28) TANK AND FILTER GP
HYDRAULIC
330-2497
(38) VALVE GP
SOLENOID AND
PRESSURE REDUCING
323-7894
TRAVEL MOTOR (LEFT)
X
T2
T1
BR
B
L
T2
T1
BR
X
L
B
BG
BG
B
A
BL1AL1
AG
A
AR1 BR1
1
1
2
2
3
3
4
4
5
5
6
6
PD-Dr
TP
TT
TRAVEL (L)
TRAVEL (R)
PD-Pi
(FWD)
(BKWD) (FWD)
(BKWD)
(FWD)
(R) (L)
(BACK)
T1
T5
T2
aL1bL1
JLP
JLT
STICK
SWING
(OUT) (IN) (R)
(L)
JL1
JL3
JL2
JL4
A1 A2 A3 A4 A5 A6 A7 A8
B1 B2 B3 B4 B5 B6 B7 B8C1 C2 C3 C4
P
aR5aL4
aR3
bR3
BPi
aR4
bL2
bR4
bL3
aL3 SPi
A
A
B
T
P
T
bR5
aL2
SRPi
BRPi
bL4
SOL1-T
BRDr2
SRDr
SOL1-T
SWDr
DR6
T-OUT1
DR5
Pi2
DR4
DR3
P1
P2
P-IN
PSA2
DR1
PSA1
DR2
T-OUT2
Pi1
PD-Pi
PD-Dr
STPi
STDr
BDr
dST
PAC
SDr
A
F
E
D
C
B
SP3
SP1
ST
ST
R.C.V-B
AL2BL2
aL2
bL2
SWING
STICK(1)
(IN)
(OUT)
(R)
(L)
BOOM(2)
(STICK-IN)
(UP)
AL3
BL3
T
BL3
bL3
aL3
bL4
SRPi
SPi
BR5
HL
SWDrSRDr
aL4
TRAVEL(L)
(FWD)
(BKWD)
STR-TRAVEL
Ps2 Ps
D1
B1
Dr1
A4
R.C.V-G
T
OUT
IN
T
B2
B1
A2
P
HL
A1
HR
HPi
P1S
P2S
bL1
P2 P1
dST
ATCH
TRAVEL(R)
(FWD)
(EXT)
Pi1
Ps1
Do
bR1 bR2
BRDr1
bR4bR3
BOOM(1)
BUCKET
(OPEN)
(DOWN)
BRDr2
AR2
BR2
BP1
aR3
(CLOSE)
(UP)
AR4
(RET)
HIGH PRESSURE LINE
aR4
(BKWD)
STPi aR1 aR2
BR1AR1STDr
aL1
AL1
BL1
Pi2
Psv
a1
a3
A2
a2
P1
A1
P2
bR5
STICK(2)
(IN)
MU
BP3
BT
BT
BDr
HR
BR4
BP2
AR3
(OUT)
R1
aR5
R.C.V-B
AR5BR5
BRPi
AL4
BPi
BDrSDr
BR3
A2
B2
MU2
PG2
DB2
DE2
AG2
BG2
MU1
DB1
PG1
A1
B1
SWING MOTOR
AG1
BG1
DE1
SWING MOTOR
A
B
AL2
BL2
MU
G
R.C.V-G
SP2
AL4
AR5
SDr
B
A
AG
A
TRAVEL MOTOR (RIGHT)
(FWD)
(BACK)
T4
T6
T3
(CLOSE)(OPEN)
(DOWN) (UP)
JRP
JRT
BOOM
BUCKET
JR4
JR2
JR3
JR1
bR1aR1
AR3
BL3
BR4 BP2
SP2
BR3
R.C.V : RETURN CHECK VALVE
(13) MOTOR GP
TRAVEL (LEFT)
355-5669
(40) VALVE GP
TRAVEL COUNTERBALANCE
(LEFT)
266-7843
(27) SWIVEL GP
225-4547
(14) MOTOR GP
TRAVEL (RIGHT)
355-5669
(12) MOTOR GP
SWING (RH)
334-9975
(41) VALVE GP
TRAVEL COUNTERBALANCE
(RIGHT)
266-7843
(11) MOTOR GP
SWING (LH)
334-9975
(34) VALVE GP
PILOT TRAVEL (WITH SHUTTLE)
323-7762
(3) CONTROL GP
JOYSTICK (RH)
335-0510
(37) VALVE GP
SHUTTLE
323-7560
(36) VALVE GP
PRESSURE REDUCING
(BOOM PRIORITY)
148-6218
(8) FILTER GP
OIL (HYDRAULIC RETURN)
188-4145
(9) FILTER GP
OIL (HYD., CASE DRAIN)
289-8194
(7) FILTER AND VALVE GP
PILOT (HYDRAULIC OIL)
158-8987
(15) PUMP GP
PISTON
(MAIN HYDRAULIC)
349-4066
(10) MANIFOLD GP
CONTROL
(PILOT OIL SUPPLY)
215-5037
(1) ACCUMULATOR GP
HYDRAULIC CHARGED
164-6981 (STD)
352-6860
(CANADA BC/AL REG)
(31) VALVE GP
CHECK (RETURN)
352-7671
(39) VALVE GP
STICK DRIFT
REDUCTION
352-7016
(29) VALVE GP
BOOM DRIFT
REDUCTION
352-7016
(33) VALVE GP
MAIN CONTROL
(HEAVY LIFT)
323-7658
(5) CYLINDER GP
BUCKET
358-8482
(6) CYLINDER GP
STICK
358-8461
(4) CYLINDER GP
BOOM
358-8439
STRAIGHT TRAVEL
SOL
SWING
PRIORITY
VALVE
TRAVEL SPEED
CHANGE SOL
SWING BREAK
SOL
HYD LOCK
SOL
BOOM REGEN
REPRV
(25) SWITCH AS
PRESSURE (LEFT TRAVEL)
319-4407
(26) SWITCH AS
PRESSURE
(RIGHT TRAVEL)
319-4407
PS
PRESS
EPRV
(24) SWITCH AS
PRESSURE
(IMPLEMENT)
319-4407
(17) SENSOR GP
PRESSURE
(BOOM DOWN CTRL)
338-6970
(20) SENSOR GP
PRESSURE
(NFC 2)
338-6970
(19) SENSOR GP
PRESSURE
(NFC 1)
338-6970
(21) SENSOR GP
PRESSURE
(OVERLOAD WARNING)
338-6971
(42) VALVE GP
RELIEF
239-8984
(22) SENSOR GP
PRESSURE
(OVERLOAD WARNING)
338-6971
a2
a3
SOS
PG
EE
a1
A2
B2
Do
(32) VALVE GP
CROSSOVER RELIEF
(SWING CUSHION)
295-9422
(2) CONTROL GP
JOYSTICK (LH)
335-0511
(23) SENSOR GP
PRESSURE
(SWING CTRL)
338-6970
(18) SENSOR GP
PRESSURE
(BOOM, HEAD END)
338-6971
BB
AA
ATT
STEM 2
EXT EPRV
ATT
STEM 1
EXT EPRV
(43) VALVE GP
SOLENOID
(PRESSURE REDUCING)
259-7430
bR2bF1
A2 B2 A1 B1
P
T
(EXT)
(EXT)
MAIN CONTROL VALVE
EE
39
38
36
33
31
30
29
10
1
VIEW ALL CALLOUTS
MAIN PUMP AND CONTROL VALVE
PG
SOS
B2
A2
a3
a2
a1
Do
35
20
19
7
VIEW ALL CALLOUTS
TOP VIEW - CAB
37
34
26
25
24
23
17
2
3
VIEW ALL CALLOUTS

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