kENR9606-02
36 Page, (Dimensions: 48 inches x 35 inches)
Hydraulic Symbols (Electrical)
Electrical Symbols Table
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)
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
FLUID POWER SYMBOLS
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 ACTING
SINGLE 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
AB
PT
AB
PT
SHIFTED POSITION
INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOT
CONTROLLED
T
Standard and Heavy Lift
KENR9606-02
March 2012
349E Excavator and 349E MHPU
Hydraulic System
349E:
FJB1-UP
DGE1-UP
SPG1-UP
TFG1-UP
RGH1-UP
KCN1-UP
MZW1-UP
KFX1-UP
MPZ1-UP
WHZ1-UP
© 2012 Caterpillar, All Rights Reserved Printed in U.S.A.
349E MHPU:
S3P1-UP
Description
Part
Number
Machine
Location
Schematic
Location
ACCUMULATOR GP - STANDARD 164-6981 1 C-9
ACCUMULATOR GP - (CANADA BC/AL REGULATION) 352-6860 2 C-9
FILTER GP - PILOT 158-8987 3 B-7
FILTER GP - DRAIN 188-4145 4 A-8
FILTER GP - RETURN 289-8194 5 B-7
MANIFOLD GP - CONTROL and SOLENOID (HEAVY LIFT) 323-7894 6 A-14
MANIFOLD GP - CONTROL and SOLENOID (HEAVY LIFT) 323-7895 6 A-12
J-14
J-11
MOTOR GP - SWING 334-9975 8 J-10, I-8
PUMP GP - MAIN 349-4066 9 C-5, B-5
SWIVEL GP - 225-454
710 H-13
VALVE GP - PRESSURE REDUCING 148-6218 11 B-11
VALVE GP - CROSSOVER RELIEF (CUSHION) 295-9422 12
I-10
G-3
G-9
VALVE GP - PUMP CONTROL 310-0107 14 D-7
H-14
H-11
VALVE GP - CHECK (RETURN) 323-7671 16 G-10
VALVE GP - SHUTTLE 323-7560 17 C-12
VALVE GP - PILOT (SHUTTLE) 323-7762 18 F-13
VALVE GP - PILOT (RIGHT) 323-7947 20 D-13
VALVE GP - PILOT (LEFT) 323-7948 21 D-14
VALVE GP - MAIN CONTROL (HEAVY LIFT) 323-7655 22 E-2, E-10
V
ALVE GP - MAIN CONTROL (STANDARD) 310-0250 23 E-2, E-10
VALVE GP - SEL 215-5037 24 C-9
VALVE GP - CHECK 352-7071 25 H-10
266-7843
15
Component Locations
MOTOR GP - LEFT and RIGHT TRAVEL
355-5669
7
VALVE GP - DRIFT REDUCTION
352-7016
13
VALVE GP - TRACTION CONTROL
Tap Number Description
Schematic
Location
Do
Pump Case Pressure
C-6
a1
Drive Pump Delivery Pressure
C-4
a3
Power Shift Pressure
B-4
a2
Idler Pump Delivery Pressure
B-4
A2
Drive Pump Negative Flow Pressure
D-7
B2
Idler Pump Negative Flow Pressure
C-7
TAP LOCATIONS
Pressure, Sampling, Sensor
PG
Pilot Pump Delivery Pressure
B-7
A
Boom Regeneration Valve Pressure
A-14, A-12
SOS
Oil Sampling Port
B-7
6
Located below the
main control value.
A
Front Filter
18
17
20
21
8
8
22
24
5
3
D0
SOS
15 15
10
PG
23
10
7
7
1
2
4
16
11
Located below the
main control value.
12
13
13
Boom Drift
Reduction Valve
Stick Drift
Reduction Valve
25
BUCKET CYLINDER
BOOM CYLINDERS
STICK CYLINDER
a1
a2
a3
A2
B2
VIEW A-A
CHASSIS VIEW
TOP DOWN
BOTTOM UP
TOP DOWN VIEW - CAB
VIEW B-B
TOP DOWN VIEW - MACHINE CENTER
VIEW C-C
RIGHT SIDE ACCESS PANEL
CYLINDERS
TANK
NOTE: This valve is located just
behind the manifold in the picture.
(9) Valve Gp. - Pump Main
(14) Valve Gp. - Pump Control
NOTE:
Front filter from the Main Pump.
LR
LR
NFC 1
PRESS SENSOR
NFC 2
PRESS SENSOR
FRONT
View A-A
View C-C
REAR
FRONT
View B-B
FRONT FRONT
KENR9606-02
36 Page, (Dimensions: 48 inches x 35 inches)
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Attachment
Air Line
CALLOUTS
ARROW PATTERNS
Taps (Pressure, Sampling, Sensor) by letter
Components by number
Connections by letter
Heavy Lift Options
YY
1
349E EXCAVATOR AND 349E MHPU HYDRAULIC SYSTEM SCHEMATIC
ATTACHMENT (STANDARD and HEAVY LIFT)
SCHEMATIC PART NUMBER: 323-7854, CHANGE: 03, VERSION: HE
MEDIA NUMBER: KENR9606-02
Components are shown installed on a fully operable machine.
Refer to the appropriate Service Manual for Troubleshooting, Specifications and System Operation.
BR2
NOTES:
(A) CONNECT aR2 and bR2
(B) FOR STANDARD LIFT
(C) FOR HEAVY LIFT
(D) FOR BC/AL REGULATION
IDENT CONNECTOR
1 LEFT TRAVEL PRESS SW
2 RIGHT TRAVEL PRESS SW
3 IMPLEMENT PRESS SWITCH
5 BOOM DOWN CONTROL PRESS SENSOR
6 SWING CONTROL PRESS SENSOR
7 BOOM CYLINDER HEAD PRESS SENSOR
8 NFC 1 PRESS SENSOR
9 NFC 2 PRESS SENSOR
10 PUMP 1 PRESS SENSOR
11 PUMP 2 PRESS SENSOR
12 PS PRESS EPRV
13 BOOM REGEN REPRV
15 NFC 1 LIMIT EPRV
16 NFC 2 LIMIT EPRV
17 SWING BREAK SOL
18 TRAVEL SPEED CHANGE SOL
19 STRAIGHT TRAVEL SOL
2
0 HYD LOCK SOL
21 SWING PRIORITY SOL
22 HEAVY LIFT SOL
DRAIN / RETURN LINE
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
IMPLEMENT AND LEFT TRAVEL PUMP OUTPUT
IMPLEMENT AND RIGHT TRAVEL PUMP OUTPUT
POWERSHIFT CONTROL CIRCUIT
PILOT PUMP OUTPUT
SUPPLY LINE
BUCKET CONTROL AND BUCKET CYLINDER CIRCUIT
RIGHT TRAVEL CONTROL AND RIGHT TRAVEL MOTOR CIRCUIT
TRAVEL SPEED CONTROL CIRCUIT
STICK CONTROL AND STICK CYLINDER CIRCUIT
BOOM CONTROL AND BOOM CYLINDER CIRCUIT
HEAVY LIFT CONTROL CIRCUIT
LEFT TRAVEL CONTROL AND LEFT TRAVEL MOTOR CIRCUIT
SWING CONTROL AND SWING MOTOR CIRCUIT
SWING BRAKE CONTROL CIRCUIT
A
B
C
D
E
F
12345678
91011121314
G
H
I
J
12345678
91011121314
A
B
C
D
E
F
G
H
I
J
= ITEMS INCLUDED IN ATTACHMENT
a2
a3
a1
D0
B2
A2
A
A
PG
SOS
P
A
T
BRPi
SOL1-T
13
SDr
BOOM CYLINDERSTICK CYLINDERBUCKET CYLINDER
T
OUT
PG
PC
IN
Pi1
Ps2
Pi2
D1
Ps1
B1 Dr1
Psv
a1
a3
a2
A1
A2A4
D0
TRAVEL MOTOR (LEFT)
TRAVEL MOTOR (RIGHT)
X
B
A
BA
AG
AG
BG
BG
T2
T2
T1
T1
BR BR
X
B
A
L
LB
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
T4T6T3
(OUT) (IN) (R)
(L)
(CLOSE)(OPEN)
(DOWN) (UP)
JLP
JLT
JRP
JRT
BOOMBUCKETSTICK SWING
JL1
JL3 JL2 JL4 JR4
JR2
JR3
JR1
1
1
2
23
3
4
4
5
56
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)
(BKWD)
P
A
B
T
A
G
F
E
D
C
B
BP3
BRDr1
AR2
BR2
SP3
SP1
ST
BP1
BT
BDr
P1SP2S
(R)
(L)
AR3 BL3
BR4
BR3
R.C.V-G
BP2
SP2
P1
P2
BL1
AL1
AR1
AL2BL2
MU
aR5
aL4
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
BDr
SRDr
SOL1-T
SOL1-T
BRDr2
SWDr
bR5
R.C.V-B
HR
bR5
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
BTAR4
BL3
(RET)
(EXT)
T
R1
STR-TRAVEL
aR5
MU
R.C.V-B
BRPi
aR2
bR2
SDr
BDr
SDr
BRDr2
HPi
(22) VALVE GP - MAIN CONTROL (HEAVY LIFT) :323-7655
(23) VALVE GP - MAIN CONTROL (STANDARD) :310-0250
(11) VALVE GP -
PRESS REDUCING:
148-6218
(21) VALVE GP -
PILOT LEFT:
323-7948
(20) VALVE GP-
PILOT RIGHT:
323-7947
(18) VALVE GP - PILOT SHUTTLE: 323-7762
(24) VALVE GP - SEL: 215-5037
(17) VALVE GP - SHUTTLE: 323-7560
(16) VALVE GP - CHECK (RETURN): 323-7671
(10) SWIVEL GP: 225-4547
(15) VALVE GP -
TRACTION CONTROL:
266-7843
(7) MOTOR GP -
LEFT TRAVEL: 355-5669
(8) MOTOR GP - SWING: 334-9975
(4) FILTER GP - DRAIN: 188-4145
(5) FILTER GP -
RETURN: 289-8194
(14) VALVE GP -
PUMP CONTROL:
310-0107
(3) FILTER GP -
PILOT: 158-8987
(9) PUMP GP - MAIN: 349-4066
(6) MANIFOLD GP -
SOLENOID w/BLOCK: 323-7895
(HEAVY LIFT)
(13) VALVE GP - DRIFT REDUCTION (BOOM): 352-7016
(12) VALVE GP - CROSSOVER RELIEF (CUSHION): 295-9422
(25) VALVE GP - CHECK: 352-7071
9
20
17
18
13
16
15
12
3
22
19
21
NOTE A
NOTE A
PSA2
B2
PSA2
BL1
AL1
AL2
BL2
AR1 BR1
P1
P2
AR3
BR3
BL3
SP2
BR4
BP2
AR5
BR5
AR5
BR5
AL4
AL4
aL4
aR3
bR3
BPi
aR4
bR4
5
6
M
8
11 10
bR1
aR1
aL1
bL1
bL2
aL2
bL3
aL3
SPi
SRPi
bL4
SRDr
HL
SWDr
dST
STPi
STDr
R.C.V-G
1
2
(7) MOTOR GP -
RIGHT TRAVEL: 355-5669
(15) VALVE GP -
TRACTION CONTROL:
266-7843
(6) MANIFOLD GP -
SOLENOID w/BLOCK: 323-7894
(STANDARD)
(1) ACCUMULATOR GP -
164-6981 STANDARD
(2) ACCUMULATOR GP -
352-6860 NOTE (D)
(13) VALVE GP - DRIFT REDUCTION (STICK): 352-7016
(8) MOTOR GP - SWING: 334-9975
(FWD)
BR1
7
CYLINDERS
B2
B2
Tap Number Description
Schematic
Location
Do
Pump Case Pressure
C-6
a1
Drive Pump Delivery Pressure
C-4
a3
Power Shift Pressure
B-4
a2
Idler Pump Delivery Pressure
B-4
A2
Drive Pump Negative Flow Pressure
D-7
B2
Idler Pump Negative Flow Pressure
C-7
TAP LOCATIONS
Pressure, Sampling, Sensor
PG
Pilot Pump Delivery Pressure
B-7
A
Boom Regeneration Valve Pressure
A-14, A-12
SOS
Oil Sampling Port
B-7
(FOR HEAVY LIFT - SEE: (6) MANIFOLD GP)
(FOR HEAVY LIFT - SEE: (6) MANIFOLD GP)
