INTERACTIVE SCHEMATIC
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©
2012 Caterpillar, All Rights Reserved
Printed in U.S.A.
UENR0421
June 2012
Stick Lowering Control Valve
349E Excavator
Hydraulic System - Attachment
DGE1-UP
TFG1-UP
KCN1-UP
MZW1-UP
KFX1-UP
MPZ1-UP
COMPONENT LOCATION
Accumulator Gp - Hydraulic (Charged) (Standard)
Accumulator Gp - Hydraulic (Canada BC/AL Reg.)
Control Gp - Joystick (LH)
Control Gp - Joystick (RH)
Cylinder Gp - Boom
Cylinder Gp - Bucket
Cylinder Gp - Stick
Filter and Valve Gp - Pilot (Hydraulic Oil)
Filter Gp - Oil (Hydraulic Return)
Filter Gp - Oil (Hydraulic, Case Drain)
Manifold Gp - Control (Pilot Oil Supply)
Motor Gp - Swing (LH)
Motor Gp - Swing (RH)
Motor Gp - Trave
l (Left)
Motor Gp - Travel (Right)
Pump Gp - Piston (Main Hydraulic)
Screen Gp - Hydraulic
Sensor Gp - Pressure (Boom Down Ctrl)
Sensor Gp - Pressure (Boom, Head End)
Sensor Gp - Pressure (Negative Flow Control 1)
Sensor Gp - Pressure (Negative Flow Control 2)
Sensor Gp - Pressure (Overload Warning)
Sensor Gp - Pressure (Overload Warning)
Sensor Gp - Pressure (Swing Control)
Switch As - Press
ure (Implement)
Switch
As - Pressure (Left Travel)
Switch As - Pressure (Right Travel)
Swivel Gp
Tank and Filter Gp - Hydraulic
Valve Gp - Check
Valve Gp - Check (Return)
Valve Gp - Check and Relief (Boom Cylinder LH)
Valve Gp - Check and Relief (Boom Cylinder RH)
Valve Gp - Crossover Relief (Swing Cushion)
Valve Gp - Manual (Boom Lower)
Valve Gp - Main Control (Heavy Lift)
Valve Gp - Pilot Travel (With Shutt
le)
Valve
Gp - Pressure Reducing (Boom Priority)
Valve Gp - Pump Control
Valve Gp - Shuttle
Valve Gp - Solenoid and Pressure Reducing
Valve Gp - Travel Counterbalance (Left)
Valve Gp - Travel Counterbalance (Right)
Description
Part
Number
Machine
Location
Schematic
Location
349E STANDARD
164-6981
352-6860
335-0511 2
D-8
335-0510 3 D-7
358-8439 4 F-3
358-8482 5 F-1
358-8461 6 F-2
158-8987 7 B-1
188-4145 8 A-2
289-8194 9 B-2
215-5037 10 A-3
334-9975 11 F-5
334-9975 12 F-6
335-5669 13 F-8
335-5669 14 F-7
349-4066 15 B-5
326-4434 16 A-2
338-6970 17 C-8
338-6971 18 E-4
338-6970 19 B-6
338-6970 20 A-6
338-6971 21 C-3
338-6971 22 C-3
338-6970 23 C-7
319-4407 24 C-7
319-4407 25 C-6
319-4407 26 C-6
1 A-2
225-4547 27 E-7
330-2497 28 A-2
352-7071 29 D-5
323-7671 30 D-5
352-7143 31 E-4
352-7143 32 E-3
295-9422 33 E-6
335-0512 34 E-4
323-7658 35 C-2
323-7762 36 C-6
148-6218 37 B-7
310-0107 38 A-6
323-7560 39 C-7
323-7894 40 B-8
266-7843 41 E-8
266-7843 42 E-7
Attachment: Stick Lowering Control Valve
Block Gp 323-7560 43
D-5
Valve Gp - Load Control (Stick Cylinder) 285-1768 44 E-2
Check Part Numbers in the Parts Manuals for your Specific Machine
TAP LOCATION
Tap
Number
Description
Schematic
Location
Do Pump Case Pressure B-5
a1 Drive Pump Delivery Pressure B-4
a3 Power Shift Pressure B-4
a2 Idler Pump Delivery Pressure B-4
A2 Drive Pump Negative Flow Press. (NFC1) A-6
B2 Idler Pump Negative Flow Press. (NFC2) A-6
PG Pilot Pump Delivery Pressure B-1
SOS Oil Sampling Port B-1
EE Boom Regeneration Valve Pressure B-8
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: STICK LOWERING CONTROL VALVE
SCHEMATIC PART NUMBER: 323-7867, CHANGE: 01, VERSION: HE
MEDIA NUMBER: UENR0421
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
T
(10) MANIFOLD GP
CONTROL
(PILOT OIL SUPPLY)
215-5037
(34) VALVE GP
MANUAL
(BOOM LOWER)
335-0512
(42) VALVE GP
TRAVEL COUNTERBALANCE
(RIGHT)
266-7843
TRAVEL MOTOR (LEFT)
TRAVEL MOTOR (RIGHT)
T2
T2
T1
T1
BR
BR
B
A
L
L
B
B
A
B
A
AG
BG
BG
(FWD)
(BKWD)
(FWD)(BKWD)
BL1AL1 AR1 BR1
AG
A
A
B
MU1
DB1
PG1
A1
B1
SWING MOTOR
AG1
BG1
DE1
A2
B2
MU2
PG2
DB2
DE2
AG2
BG2
SWING MOTOR
(R)
AL2
BL2
(L)
MU
aL4
DRAIN
FILTER
2 SPEED
TRAVEL
CONTROL
(OUT) (IN) (R)
(L)
(CLOSE)(OPEN)
(DOWN) (UP)
JLP
JLT
JRP
JRT
BOOM
BUCKET
STICK
SWING
JL1
JL3
JL2
JL4
JR4
JR2
JR3
JR1
BLCV-Pi
aR5
bL4
aL4
aR3
bR3
aR4
bL2
aL2
bR4
bL3
aL3
SLCV-Pi
SRPi
A1 A2 A3 A4
A5 A6
A7
A8
B1 C1 B2
B3
C2
B4
C3
B5
B6 B7
C4
B8
EE
BOOM REGEN
REPRV
T
P
A
BRPi
SOL1-T
BRDr2
P
A
B
T
bR5
SWG
PRKG BK
CONTROL
TRAVEL (L)
(FWD)
T5
T2
bL1
TP
TT
TRAVEL (R)
1
1
2
2
3
3
4
4
5
5
6
6
PD-Pi
PD-Dr
(BKWD)
(FWD)
(BKWD)
T1
T4
T6
T3
bR1aR1aL1
A2
B2
NFC2 LIMIT
EPRV
NFC1 LIMIT
EPRV
B2
B1
A2
A1
HL
HR
P
A
F
E
D
C
B
SP3
SP2
SP1
R.C.V-G
R.C.V-B
T
(UP)
AL3
AL4
AR5
G
(STICK-IN)
BOOM(2)
bL4 SRPi
HL
SRDr
Do
a2
a3
a1
PS
PRESS EPRV
Ps2
Pi2
D1
Ps1
B1
Dr1
Psv
a3
A4
Do
Pi1
a1
a2
A1
A2
Ps
P1
P2
STPi
SWING PRIORITY
VALVE
AL2BL2
aL1
bL1
aL2
bL2
AL1
BL1
ST
BL3
(IN)
(OUT)
STICK(1)
(R)
(L)
SWING
(FWD)
(BKWD)
TRAVEL(L)
STR-TRAVEL
BL3
bL3
aL3
BR5
STDr
SWDr
dST
CYL
X
Dr
CV
Pi
T
X
T
Pi
CV
Dr
X
CYL
X
BLCV-Dr
BLCV-Pi
STRAIGHT TRAVEL
SOL
BR2
P1S
P2S
aR1
bR1
BR1
AR1
(FWD)
(BKWD)
TRAVEL(R)
(EXT)
(RET)
ATCH
STPi
P2 P1
aR2
bR2
HPi
NOTE A
NOTE A
TRAVEL SPEED
CHANGE SOL
SWING BREAK
SOL
HYD LOCK
SOL
DR6
T-OUT1
DR5
Pi2
DR4
DR3
P2
PSA2
DR1
PSA1
DR2
T-OUT2
Pi1
P1
2 SPEED
TRAVEL
CONTROL
SWG
PRKG BK
CONTROL
P-IN
STDr
SRDrSOL1-T
PD-Pi PD-Dr
HL-Pi
SOS
PG
T
OUT
PC
IN
PG
PAC
BLCV-Dr
DRAIN
FILTER
R.C.V-G
dST
SWDr
BP1
BRDr1
AR2
bR4
aR3
bR3
(OPEN)
BUCKET
(CLOSE)
(DOWN)
(UP)
BOOM(1)
AR4
aR4
BRPi
BRDr2
BP3
BP2
AL4
BR3 AR3
BR3AR3
BL3
BR4
MU
HR
bR5
BT
(IN)
STICK(2)
(OUT)
R1
aR5
SLCV-Pi
SLCV-Dr
R.C.V-B
AR5BR5
NOTE A: CONNECT aR2 and bR2
X
X
(13) MOTOR GP
TRAVEL (LEFT)
355-5669
(14) MOTOR GP
TRAVEL (RIGHT)
355-5669
(12) MOTOR GP
SWING (RH)
334-9975
(11) MOTOR GP
SWING (LH)
334-9975
(31) VALVE GP
LOAD CONTROL
(BOOM CYLINDER LH)
352-7143
(32) VALVE GP
LOAD CONTROL
(BOOM CYLINDER RH)
352-7143
(4) CYLINDER GP
BOOM
358-8439
(5) CYLINDER GP
BUCKET
358-8482
(6) CYLINDER GP
STICK
358-8461
(35) VALVE GP
MAIN CONTROL
323-7658 (HEAVY LIFT)
(21) SENSOR GP
PRESSURE
(OVERLOAD WARNING)
338-6971
(22) SENSOR GP
PRESSURE
(OVERLOAD WARNING)
338-6971
(26) SWITCH AS
PRESSURE
(RIGHT TRAVEL)
319-4407
(25) SWITCH AS
PRESSURE
(LEFT TRAVEL)
319-4407
(23) SENSOR GP
PRESSURE
(SWING CTRL)
338-6970
(24) SWITCH AS
PRESSURE
(IMPLEMENT)
319-4407
(17) SENSOR GP
PRESSURE
(BOOM DOWN CTRL)
338-6970
(39) VALVE GP
SHUTTLE
323-7560
(3) CONTROL GP
JOYSTICK (RH)
335-0510
(2) CONTROL GP
JOYSTICK (LH)
335-0511
(41) VALVE GP
TRAVEL COUNTERBALANCE
(LEFT)
266-7843
(27) SWIVEL GP
225-4547
(33) VALVE GP
CROSSOVER RELIEF
(SWING CUSHION)
295-9422
(29) VALVE GP
CHECK
352-7071
(43) BLOCK GP
323-7650
(40) VALVE GP
SOLENOID AND
PRESSURE REDUCING
323-7894
(37) VALVE GP
PRESSURE REDUCING
(BOOM PRIORITY)
148-6218
(38) VALVE GP
PUMP CONTROL
310-0107
(19) SENSOR GP
PRESSURE
(NFC 1)
338-6970
(20) SENSOR GP
PRESSURE
(NFC 2)
338-6970
(15) PUMP GP
PISTON
(MAIN HYDRAULIC)
349-4066
(1) ACCUMULATOR GP
HYDRAULIC CHARGED
164-6981 (STD)
352-6860
(CANADA BC/AL REG)
(8) FILTER GP
OIL (HYDRAULIC RETURN)
188-4145
(16) SCREEN GP
HYDRAULIC
326-4434
(28) TANK AND FILTER GP
HYDRAULIC
330-2497
(9) FILTER GP
OIL
(HYD., CASE DRAIN)
289-8194
(7) FILTER AND VALVE GP
PILOT (HYDRAULIC OIL)
158-8987
(36) VALVE GP
PILOT TRAVEL (WITH SHUTTLE)
323-7762
(18) SENSOR GP
PRESSURE
(BOOM HEAD END)
338-6971
(30) VALVE GP
CHECK (RETURN)
352-7671
(44) VALVE GP
LOAD CONTROL
(STICK CYLINDER)
285-1768
CYL
DR
CV
Pi
T
MACHINE COMPONENT LOCATIONS
44
42
41
33
28
27
22
21
16
15
14
13
12
11
9
8
6
5
4
VIEW ALL CALLOUTS
BOOM LOWERING CONTROL VALVE
34
32
31
18
VIEW ALL CALLOUTS
MAIN CONTROL VALVE
EE
43
40
37
35
30
29
10
1
VIEW ALL CALLOUTS
MAIN PUMP AND CONTROL VALVE
SOS
PG
B2
A2
a2
a3
a1
Do
38
20
19
7
VIEW ALL CALLOUTS
TOP VIEW - CAB
39
36
26
25
24
23
17
3
2
VIEW ALL CALLOUTS
