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
EC-C2
E-C60
EC-C1
E-C61
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©
2012 Caterpillar, All Rights Reserved
Printed in U.S.A.
UENR0426
April 2012
Smart Boom
349E Excavator
Hydraulic System - Attachment
DGE1-UP
TFG1-UP
KCN1-UP
MZW1-UP
KFX1-UP
MPZ1-UP
COMPONENT LOCATION
Block Gp 323-7560 41 F-2
Plate 259-7504 42 H-5
Sensor Gp - Pressure (Boom, Head End) 338-6971 43 I-6
Valve Gp - Check (Boom Float Up) 297-0371 44 G-6
Valve Gp - Load Control (Boom Cylinder LH) 352-7143 45 I-7
Valve Gp - Load Control (Boom Cylinder RH) 352-7143 46 I-5
Valve Gp - Manual (Boom Lower) 335-0512 47 I-6
Valve Gp - Solenoid and Pressure Red. (Boom Lowering Ctrl) 323-7894 48 C-12
Attachment: Smart Boom
Swivel Gp 225-4547 28
H-12
Tank and Filter Gp - Hydraulic 330-2497 29 A-3
Valve Gp - Check 352-7071 30 G-8
Valve Gp - Check (Return) 323-7671 31 F-8
Valve Gp - Crossover Relief (Swing Cushion) 295-9422 32 H-9
Valve Gp - Main Control (Heavy Lift) 323-7658 33 E-2
Valve Gp - Pilot Travel (With Shuttle) 323-7762 34 E-10
Valve Gp - Pump Control 310-0107 35 B-10
Valve Gp - Pressure Reducing (Boom Priority) 148-6218 36 C-11
Valve Gp - Shuttle 323-7560 37 E-12
Valve Gp - Stick Drift Reduction 352-7016 38 F-7
Valve Gp - Travel Counterbalance (Left) 266-7843 39 H-13
Valve Gp - Travel Counterbalance (Right) 266-7843 40 H-11
8 A-3
Filter Gp - Oil (Hydraulic, Case Drain) 289-8194 9 B-3
Manifold Gp - Control (Pilot Oil Supply) 215-5037 10 B-5
Manifold and Solenoid Gp - Control 323-7895 11 C-14
Motor Gp - Swing (LH) 334-9975 12 I-8
Motor Gp - Swing (RH) 334-9975 13 I-9
Motor Gp - Travel (Left) 335-5669 14 I-13
Motor Gp - Travel (Right) 335-5669 15 I-11
Pump Gp - Piston (Main Hydraulic) 349-4066 16 C-7
Screen Gp - Hydraulic 326-4434 17 A-2
Sensor Gp - Pressure (Boom Down Ctrl) 338-6970 18 D-13
Sensor Gp - Pressure (Boom, Rod End) 338-6971 19 J-6
Sensor Gp - Pressure (Negative Flow Control 1) 338-6970 20 B-9
Sensor Gp - Pressure (Negative Flow Control 2) 338-6970 21 A-9
Sensor Gp - Pressure (Overload Warning) 338-6971 22 D-5
Sensor Gp - Pressure (Overload Warning) 338-6971 23 D-5
Sensor Gp - Pressure (Swing Control) 338-6970 24 D-12
Switch As - Pressure (Implement) 319-4407 25 D-13
Switch As - Pressure (Left Travel) 319-4407 26 D-11
Switch As - Pressure (Right Travel) 319-4407 27 D-10
Accumulator Gp - Hydraulic (Charged) (Standard) 164-6981
Accumulator Gp - Hydraulic (Canada BC/AL Reg.) 352-6860
Control Gp - Joystick (LH) 335-0511 2
F-13
Control Gp - Joystick (RH) 335-0510 3 F-12
Cylinder Gp - Boom 358-8439 4 J-6
Cylinder Gp - Bucket 358-8482 5 J-3
Cylinder Gp - Stick 358-8461 6 J-2
Filter and Valve Gp - Pilot (Hydraulic Oil) 158-8987 7 C-2
Filter Gp - Oil (Hydraulic Return) 188-4145
349E STANDARD
1
A-4
Description
Part
Number
Machine
Location
Schematic
Location
TAP LOCATION
Schematic
Location
C-9
C-7
B-7
B-7
B-9
B-9
B-2
B-2
B-13
B-12
Tap
Number
Description
Do Pump Case Pressure
a1
Drive Pump Delivery Pressure
a3
Power Shift Pressure
a2
Idler Pump Delivery Pressure
A2
Drive Pump Negative Flow Pressure (NFC1)
B2
Idler Pump Negative Flow Pressure (NFC2)
PG
Pilot Pump Delivery Pressure
SOS
Oil Sampling Port
EE
Boom Regeneration Valve Pressure
FF
Boom Pilot Pressure
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: SMART BOOM
SCHEMATIC PART NUMBER: 323-7861, CHANGE: 02, VERSION: HE
MEDIA NUMBER: UENR0426
THIS SCHEMATIC IS FOR THE 349E EXCAVATOR HYDRAULIC SYSTEM
A
B
C
D
E
F
12345678
91011121314
G
H
I
J
12345678
91011121314
A
B
C
D
E
F
G
H
I
J
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
YY
(27) SWITCH AS
PRESSURE
(RIGHT TRAVEL)
319-4407
(34) VALVE GP
PILOT TRAVEL
(WITH SHUTTLE)
323-7762
(37) VALVE GP
SHUTTLE
323-7560
(15) MOTOR GP
TRAVEL (RIGHT)
355-5669
(39) VALVE GP
TRAVEL COUNTERBALANCE
(LEFT)
266-7843
(20) SENSOR GP
PRESSURE
(NEGATIVE FLOW CTRL 1)
338-6970
(13) MOTOR GP
SWING (RH)
334-9975
(12) MOTOR GP
SWING (LH)
334-9975
(32) VALVE GP
CROSSOVER RELIEF
(SWING CUSHION)
295-9422
(2) CONTROL GP
JOYSTICK (LH)
335-0511
(14) MOTOR GP
TRAVEL (LEFT)
355-5669
(3) CONTROL GP
JOYSTICK (RH)
335-0510
(28) SWIVEL GP
225-4547
(17) SCREEN GP
HYDRAULIC
326-4434
(1) ACCUMULATOR GP
HYDRAULIC CHARGED
(STD) 164-6981
(CANADA BC/AL REG) 352-6860
(11) MANIFOLD AND SOLENOID GP
CONTROL
323-7895
(9) FILTER GP
OIL
(HYD., CASE DRAIN)
289-8194
(7) FILTER AND VALVE GP
PILOT (HYDRAULIC OIL)
158-8987
(8) FILTER GP
OIL (HYDRAULIC RETURN)
188-4145
(29) TANK AND FILTER GP
HYDRAULIC
330-2497
(10) MANIFOLD GP
CONTROL
(PILOT OIL SUPPLY)
215-5037
(16) PUMP GP
PISTON
(MAIN HYDRAULIC)
349-4066
(40) VALVE GP
TRAVEL COUNTERBALANCE
(RIGHT)
266-7843
EE
FF
Do
a2
a3
A2
B2
SOS
PG
a1
(25) SWITCH AS
PRESSURE
(IMPLEMENT)
319-4407
PS
PRESS EPRV
CYL
X
Dr
CV
Pi
T
X
T
Pi
CV
Dr
X
CYL
X
A
B
Dr
A
B
Dr
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
DRAIN
FILTER
(FWD)
(BKWD)
(FWD)(BKWD)
(R)
(L)
SWG
PRKG BK
CONTROL
2 SPEED
TRAVEL
CONTROL
MU
BLCV-Dr
BLCV-Pi
HEAVY LIFT
SOL
BOOM REGEN
REPRV
BOOM DOWN
REPRV (S1)
NFC2 LIMIT
EPRV
NFC1 LIMIT
EPRV
TRAVEL SPEED
CHANGE SOL
SWING BREAK
SOL
HYD LOCK
SOL
SWING PRIORITY
VALVE
(18) SENSOR GP
PRESSURE
(BOOM DOWN CTRL)
338-6970
(24) SENSOR GP
PRESSURE
(SWING CTRL)
338-6970
(26) SWITCH AS
PRESSURE
(LEFT TRAVEL)
319-4407
(35) VALVE GP
PUMP CONTROL
310-0107
(19) SENSOR GP
PRESSURE
(BOOM, ROD END)
338-6971
(43) SENSOR GP
PRESSURE
(BOOM,
HEAD END)
338-6971
(4) BOOM CYLINDER
358-8439
(6) STICK CYLINDER
358-8461
(5) BUCKET CYLINDER
358-8482
(46) VALVE GP
LOAD CONTROL
(BOOM CYLINDER RH)
352-7143
(45) VALVE GP
LOAD CTRL
(BOOM CYLINDER LH)
352-7143
(47) VALVE GP
MANUAL
(BOOM LOWER)
335-0512
(42) PLATE
259-7504
BOOM DOWN ELE
CHECK SOL (EC2)
BOOM UP ELE
CHECK SOL (EC2)
(44) VALVE GP
CHECK
(BOOM FLOAT UP)
297-0371
STRAIGHT TRAVEL
SOL
(48) VALVE GP
SOLENOID AND
PRESSURE REDUCING
323-7894
(30) VALVE GP
CHECK
352-7071
(31) VALVE GP
CHECK (RETURN)
352-7671
(38) VALVE GP
STICK DRIFT REDUCTION
352-7016
(41) BLOCK GP
323-7650
(33) VALVE GP
MAIN CONTROL
(HEAVY LIFT)
323-7658
(36) VALVE GP
PRESSURE REDUCING
(BOOM PRIORITY)
148-6218
(23) SENSOR GP
PRESSURE
(OVERLOAD
WARNING)
338-6971
AL2
BL2
BR4
BR3AR3
SP2BL3
T
OUT
PC
IN
TP
TT
TRAVEL (L)
TRAVEL (R)
(FWD)
(BKWD)
(FWD)
(BKWD)
T1
T5
T2
T4
T6
T3
Ps2
Pi2
D1
Ps1
B1
Dr1
Psv
a3
A4
D0
DR6
T-OUT1
DR5
Pi2
DR4
DR3
P2
PSA2
DR1
PSA1
DR2
T-OUT2
Pi1
(OUT) (IN) (R)
(L)
(CLOSE)(OPEN)
(DOWN) (UP)
JLP
JLT
JRP
JRT
BOOM
BUCKET
STICK
SWING
JL1
JL3
JL2
JL4
JR4
JR2
JR3
JR1
PG
PAC
1
1
2
2
3
3
4
4
5
5
6
6
P
A
T
T
T
B2
B1
A2
A1
P1
A1
A2
Pi1
a1
a2
A1
A2
Ps
P1
BLCV-Dr
BLCV-Pi
DRAIN
FILTER
P
A
B
T
BP1
BR4
BP3
BP2
A
G
F
E
D
C
B
BRDr1
AR2
BR2
SP3
SP1
P1S
P2S
2 SPEED
TRAVEL
CONTROL
SWG
PRKG BK
CONTROL
MU
P2
P-IN
P
SDr
R.C.V-G
aR5
bL4
aL4
aR3
bR3
aR4
bL2
aL2
bR4
bL3
aL3
SPi
bR1aR1aL1bL1
SRPi
bR5
AL4
R.C.V-G
R.C.V-B
HR
bR4 bR5
AL2BL2 BR3 AR3
aR3
bR3
aL1
bL1
aL2
bL2
AL1
BL1
aR1
bR1
BR1AR1
T
(STICK-IN)
(UP)
BOOM(2)
AL3
ST
BL3
(IN)
(OUT)
STICK(1)
(R)
(L)
SWING
(FWD)
(BKWD)
TRAVEL(L)
STR-TRAVEL
(FWD)
(BKWD)
TRAVEL(R)
(EXT)
(RET)
ATCH
(OPEN)
BUCKET
(CLOSE)
(DOWN)
(UP)
BOOM(1)
AR4
BT
(IN)
STICK(2)
(OUT)
R1
SP2
BL3
bL3
aL3
bL4 SRPi
aR5
R.C.V-B
AR5BR5
AL4
AR5
SPi
aR4
BRPi
BR5
STPi
STDr
P2 P1
HL
aR2
bR2
SDr
SWDrSRDr BRDr2
dST
aL4
BR4
HPi
P1
P2
STPi
STDr
A1 A2 A3 A4
A5 A6
A7
A8
B1 C1 B2
B3
C2
B4
C3
B5
B6 B7
C4
B8
BRPi
HL
HR
dST
SRDr
SOL1-T
SOL1-T
BRDr2
PD-Pi
PD-Dr
PD-Pi PD-Dr
SOL2-T
SOL2-T
HPi
HL-Pi
HL-Pi
SWDr
BL1AL1 AR1 BR1
NOTE A: CONNECT aR2 and bR2
NOTE A
(21) SENSOR GP
PRESSURE
(NEGATIVE FLOW CTRL 2)
338-6970
(22) SENSOR GP
PRESSURE
(OVERLOAD
WARNING)
338-6971
MAIN CONTROL VALVE
FF
EE
48
41
38
36
33
31
30
11
10
1
VIEW ALL CALLOUTS
MAIN PUMP AND CONTROL VALVE
SOS
PG
B2
A2
a2
a3
a1
Do
35
21
20
7
VIEW ALL CALLOUTS

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