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CAT 349E Excavator Hydraulic System Attachment Medium Pressure

INTERACTIVE SCHEMATIC
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EC-C3
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©
2012 Caterpillar, All Rights Reserved
Printed in U.S.A.
UENR0427
May 2012
Medium Pressure
349E Excavator
Hydraulic System - Attachment
FJB1-UP
DGE1-UP
SPG1-UP
TFG1-UP
RGH1-UP
KCN1-UP
MZW1-UP
KFX1-UP
MPZ1-UP
WHZ1-UP
COMPONENT LOCATION
Description
Part
Number
Machine
Location
Schematic
Location
Accumulator Gp - Hydraulic (Charged) (Standard) 164-6981
Accumulator Gp - Hydraulic (Canada BC/AL Reg.) 352-6860
Control Gp - Joystick (LH) 335-0511 F-14
Control Gp - Joystick (RH) 335-0510 F-12
Cylinder Gp - Boom 358-8439 G-4
Cylinder Gp - Bucket 358-8482 I-3
Cylinder Gp - Stick 358-8461 I-3
Filter and Valve Gp - Pilot (Hydraulic Oil) 158-8987 C-2
Filter Gp - Oil (Hydraulic Return) 188-4145 A-3
Filter Gp - Oil (Hydraulic, Case Drain) 289-8194 B-3
Manifold Gp - Control (Pilot Oil Supply) 215-5037 B-6
Motor Gp - Swing (LH) 334-9975 I-8
Motor Gp - Swing (RH) 334-9975 I-9
Motor Gp - Travel (Left) 335-5669 I-14
Motor Gp - Travel (Right) 335-5669 I-12
Pump Gp - Piston (Main Hydraulic) 349-4066 C-8
Screen Gp - Hydraulic 326-4434 A-2
Sensor Gp - Pressure (Boom Down Ctrl) 338-6970 D-14
Sensor Gp - Pressure (Boom, Head End) 338-6971 G-3
Sensor Gp - Pressure (Negative Flow Control 1) 338-6970 B-10
Sensor Gp - Pressure (Negative Flow Control 2) 338-6970 A-10
Sensor Gp - Pressure (Overload Warning) 338-6971 D-5
Sensor Gp - Pressure (Overload Warning) 338-6971 D-5
Sensor Gp - Pressure (Swing Control) 338-6970 D-12
Switch As - Pressure (Implement) 319-4407 D-13
Switch As - Pressure (Left Travel) 319-4407 D-11
Switch As - Pressure (Right Travel) 319-4407 D-10
Swivel Gp 225-4547 G-12
Tank and Filter Gp - Hydraulic 330-2497 A-3
Valve Gp - Boom Drift Reduction 352-7016 F-2
Valve Gp - Check 352-7071 G-8
Valve Gp - Check (Return) 323-7671 F-8
Valve Gp - Crossover Relief (Swing Cushion) 295-9422 H-10
Valve Gp - Pilot Travel (With Shuttle) 323-7762 E-10
Valve Gp - Pump Control 310-0107 B-10
Valve Gp - Shuttle 323-7560 E-12
Valve Gp - Pressure Reducing (Boom Priority) 148-6218 B-12
Valve Gp - Solenoid and Pressure Reducing 323-7894 C-14
Valve Gp - Stick Drift Reduction 352-7016 F-7
Valve Gp - Travel Counterbalance (Left) 266-7843 H-14
Valve Gp - Travel Counterbalance (Right) 266-7843 H-11
349E STANDARD
Attachment: Medium Pressure
Valve Gp - Control (Medium Pressure, Pump Relief) 310-0165 I-6
Pump Gp - Gear 207-8235 C-9
Valve Gp - Solenoid (Pressure Reducing) 259-7430 A-12
Valve Gp - Main Control (Standard) 310-0338 D-3
B-4
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
34
35
37
36
38
39
40
41
33
42
43
44
1
Check Part Numbers in the Parts Manuals for your Specific Machine
TAP LOCATION
Tap
Number
Description
Schematic
Location
Do Pump Case Pressure C-9
a1 Drive Pump Delivery Pressure C-7
a3 Power Shift Pressure B-7
a2 Idler Pump Delivery Pressure B-7
A2 Drive Pump Negative Flow Pressure (NFC1) B-10
B2 Idler Pump Negative Flow Pressure (NFC2) B-10
PG Pilot Pump Delivery Pressure C-2
FF Medium Pressure Pump Pressure H-4
EE Boom Regeneration Valve Pressure B-14
SOS Oil Sampling Port C-2
AA bR2, Attachment Extend Pilot Pressure (B1) A-12
BB bF1, Attachment Extend Pilot Pressure (B2) A-12
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: MEDIUM PRESSURE
SCHEMATIC PART NUMBER: 323-7844, CHANGE: 02, VERSION: HE
MEDIA NUMBER: UENR0427
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
(RET)
(EXT)
(RET)
(EXT)
(EXT)
(EXT)
A1
B1
P
PPS
PLS
T1
T2
bR5
2 SPEED
TRAVEL
CONTROL
(26) SWITCH AS
PRESSURE
(RIGHT TRAVEL)
319-4407
(34) VALVE GP
PILOT TRAVEL
(WITH SHUTTLE)
323-7762
(37) VALVE GP
SHUTTLE
323-7560
(14) MOTOR GP
TRAVEL (RIGHT)
355-5669
(40) VALVE GP
TRAVEL COUNTERBALANCE
(LEFT)
266-7843
(19) SENSOR GP
PRESSURE
(NEGATIVE FLOW CONTROL 1)
338-6970
(42) PUMP GP
GEAR
207-8235
(12) MOTOR GP
SWING (RH)
334-9975
(11) MOTOR GP
SWING (LH)
334-9975
(32) VALVE GP
CROSSOVER RELIEF
(SWING CUSION)
295-9422
(2) CONTROL GP
JOYSTICK (LH)
335-0511
(13) MOTOR GP
TRAVEL (LEFT)
355-5669
(3) CONTROL GP
JOYSTICK (RH)
335-0510
(27) SWIVEL GP
225-4547
(16) SCREEN GP
HYDRAULIC
326-4434
(1) ACCUMULATOR GP
HYDRAULIC (CHARGED)
(STD) 164-6981
(CANADA BC/AL REG)
352-6860
319-4407
(38) VALVE GP
SOLENOID AND
PRESSURE REDUCING
323-7894
(9) FILTER GP
OIL (HYDRAULIC,
CASE DRAIN)
289-8194
(7) FILTER AND VALVE GP
NOTE A: CONNECT aR2 AND bR2.
R.C.V : RETURN CHECK VALVE
PILOT (HYDRAULIC OIL)
158-8987
(8) FILTER GP
OIL (HYDRAULIC
RETURN)
188-4145
(28) TANK AND FILTER GP
HYDRAULIC
330-2497
(10) MANIFOLD GP
CONTROL
(PILOT OIL SUPPLY)
215-5037
(15) PUMP GP
PISTON (MAIN HYDRAULIC)
R.C.V: RETURN CHECK VALVE
349-4066
266-7843
(41) VALVE GP
TRAVEL COUNTERBALANCE
(RIGHT)
EE
FF
Do
a2
a3
A2
B2
PG
SOS
a1
(24) SWITCH AS
PRESSURE
(IMPLEMENT)
PS
PRESS EPRV
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
BOOM REGEN
REPRV
NFC2 LIMIT
EPRV
NFC1 LIMIT
EPRV
TRAVEL SPEED
CHANGE SOL
SWING BREAK
SOL
HYD LOCK
SOL
SWING PRIORITY
VALVE
(17) SENSOR GP
PRESSURE
(BOOM DOWN CTRL)
338-6970
(23) SENSOR GP
PRESSURE
(SWING CTRL)
338-6970
(25) SWITCH AS
PRESSURE
(LEFT TRAVEL)
319-4407
310-0107
(35) VALVE GP
PUMP CONTROL
(20) SENSOR GP
PRESSURE
(NEGATIVE FLOW
CONTROL 2)
338-6970
(18) SENSOR GP
PRESSURE
(BOOM, HEAD END)
NOTE A
338-6971
(4) BOOM CYLINDER
358-8439
(6) STICK CYLINDER
358-8461
(5) BUCKET CYLINDER
358-8482
STRAIGHT TRAVEL
SOL
(30) VALVE GP
CHECK
352-7071
(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
(STD) 310-0338
(36) VALVE GP
PRESSURE REDUCING
(BOOM PRIORITY)
148-6218
(22) SENSOR GP
NOTE A
PRESSURE
(OVERLOAD
WARNING)
338-6971
(21) SENSOR GP
PRESSURE
(OVERLOAD
WARNING)
338-6971
AL4
R.C.V-G
R.C.V-B
M.P.V-T
HR
bR4 bR5
AL2BL2 BR3 AR3
BPi
SDr
BDr
aR3
bR3
aL1
bL1
aL2
bL2
AL1
BL1
aR1
bR1
BR1
BR2 AR2
AR1
T
A
(STICK-IN)
(UP)
BOOM(2)
AL3
ST
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
BP2
BR4
P1
P2
STPi
STDr
T
OUT
IN
A1 A2 A3 A4
A5 A6
A7
A8
B1 C1 B2
B3
C2
B4
C3
B5
B6 B7
C4
B8
BRPi
HL
HR
M.P.V-P
M.P.V-P
M.P.V-T
dST
SRDr
SOL1-T
SOL1-T
PD-Pi
PD-Dr
PD-Pi
PD-Dr
SWDr
BL1AL1 AR1 BR1
BP1
BT
BDr
BP3
SP1
SDr
SP3
B
C
D
E
F
G
HPi
P2S
P1S
BRDr1
Do
A4
A1
B1
P
P
T
A1
P
A
B
T
A2
B2
B2
B1
B1
D1
Ps2 Ps
Pi2
Dr1
Ps1
A1
a1
a3
a2
A2
Psv
Pi1
bL3
SRPi
SPi
(OUT) (IN) (R)
(L)
(CLOSE)(OPEN)
(DOWN) (UP)
JL1
JL3
JL2
JL4
JR4
JR2
JR3
JR1
BPi
bR4
aR5
aL4
aR3
bR3
aR4
bL2
aL2
aL3
1
1
2
2
3
3
4
4
5
5
6
6
TP
TT
TRAVEL (L)
TRAVEL (R)
(FWD)
(BKWD)
(FWD)
(BKWD)
T1
T5
T2
T4
T6
T3
bR1aR1aL1bL1
BDr
DRAIN
FILTER
R.C.V-G
MU
JLP
JLT
JRP
JRT
BOOM
BUCKET
STICK
SWING
AL2
BL2
P2
P1
PSA2
DR1
PSA1
DR2
T-OUT2
Pi1
P-IN
DR6
T-OUT1
PAC
DR5Pi2
DR4
DR3
SWG
PRKG BK
CONTROL
BR3
AR3
BR4
BP2
SP2BL3
BB
AA
ATT
STEM 2
EXT EPRV
ATT
STEM 1
EXT EPRV
(44) VALVE GP
SOLENOID
(PRESSURE
REDUCING)
259-7430
Pa1Pb1
Pa1
Pb1
A2 B2 A1 B1
P
T
(EXT)
(EXT)
(RET)
(EXT)
(RET)
(EXT)
(43) VALVE GP
CONTROL
(MEDIUM PRESSURE,
PUMP RELIEF)
310-0165
MAIN CONTROL VALVE
EE
39
38
36
33
31
30
29
10
1
VIEW ALL CALLOUTS
MAIN PUMP AND CONTROL VALVE
SOS
PG
B2
A2
a2
a3
a1
Do
35
20
19
7
VIEW ALL CALLOUTS

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