UENR0401
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
A B
P T
A B
P T
SHIFTED POSITION
INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOT
CONTROLLED
T
Stick Lowering Control Valve
UENR0401
February 2011
336E Excavator
Hydraulic System - Attachment
YCE1-UP
TEP1-UP
BZY1-UP
TMZ1-UP
© 2011 Caterpillar, All Rights Reserved Printed in U.S.A.
FRONT
FRONT
RIGHT SIDE ACCESS PANELTOP DOWN VIEW - MACHINE CENTERTOP DOWN VIEW - CAB
FRONT
Description
Part
Number
Machine
Location
Schematic
Location
Accumulator Gp - Hydraulic (Charged) 164-6981
1 B-12
Control Gp - Joystick (LH) 323-7948
2 H-14
Control Gp - Joystick (RH) 323-7947
3 H-12
Cylinder Gp - Boom 358-5972
4 J-6
Cylinder Gp - Bucket 357-9766
5 J-9
Cylinder Gp - Stick 357-4703
6 J-8
Filter and Valve Gp - Pilot (Hydraulic Oil) 158-8987
7 A-7
Filter Gp - Oil (Hydraulic Return) 188-4145
8 A-9
Filter Gp - Oil (Hyd
raulic
, Case Drain) 289-8194
9 A-8
Manifold Gp - Control (Pilot Oil Supply) 215-5037
10 B-12
Motor Gp - Swing 334-9973
11 J-10
Motor Gp - Travel (Left) 271-6376
12 J-4
Motor Gp - Travel (Right) 271-6376
13 J-10
Pump Gp - Piston (Main Hydraulic) 349-4065
14 F-3
Screen Gp - Hydraulic 326-4408
15 A-9
Sensor Gp - Pressure (Negative Flow Control) 338-6970
16 F-1
Sensor Gp - Pressure (Negative Flow Control) 338-6970
17 D-1
Sensor Gp - Pres
sure (Overload Warning) 338-6971
18 C-8
Sensor Gp - Pressure (Overload Warning) 338-6970
19 F-12
Sensor Gp - Pressure (Overload Warning) 338-6970
20 F-14
Sensor Gp - Pressure (Overload Warning) 338-6971
21 C-8
Sensor Gp - Pressure (Overload Warning) 338-6971
22 I-8
Switch As - Pressure 319-4407
23 F-13
Switch As - Pressure (Left Travel) 319-4407
24 I-13
Switch As - Pressure (Right Travel) 310-4407
25 I-12
Swivel Gp 234-4440
26
H-2
Tank and Filter Gp - Hydraulic 319-9805
27 A-10
Valv
e Gp - Check 323-7502
28 H-6
Valve Gp - Load Control (Boom Cylinder LH) 263-1964
29 J-7
Valve Gp - Load Control (Boom Cylinder RH) 263-1964
30 J-5
Valve Gp - Main Control 335-0240
31 H-9
Valve Gp - Manual (Boom Lower) 335-0512
32 I-6
Valve Gp - Pilot Travel (With Shuttle) 323-7762
33 J-12
Valve Gp - Pressure Reducing 285-1613
34 D-12
Valve Gp - Pump Control 310-0107
35 F-2
Valve Gp - Shuttle 323-7560
36 G-12
Valv
e Gp - Solenoid (With Block) (Boom Lowering) 323-7894
37 D-14
Valve Gp - Swing Cushion 204-2678
38 I-10
Valve Gp - Travel Counterbalance (Left) 322-8714
39 I-4
Valve Gp - Travel Counterbalance (Right) 322-8714
40 I-1
Valve Gp - Load Control (Stick Cylinder) 285-1768
41
I-8
Component Location
Standard 336E
Attachment: Stick Lowering Control Valve
R
L
31
33 363
2
101
26
39 12
1138
14
A2B2
35
7
PGa3
a2
a1
27
37 28
8
9
A
RIGHT TRAVEL MOTOR
LEFT TRAVEL MOTOR
34
15
PC
Tap Number Description
Schematic
Location
Do
Pump Case Pressure
F-4
a1
Drive Pump Delivery Pressure
E-2
a3
Power Shift Pressure
E-2
a2
Idler Pump Delivery Pressure
E-2
A2
Drive Pump Negative Flow Pressure (NFC1)
F-1
B2
Idler Pump Negative Flow Pressure (NFC2)
E-1
PG
Pilot Pump Delivery Pressure
A-7
A
Boom Regeneration Valve Pressure
C-13
PC
SOS
A-7
TAP LOCATIONS
Pressure, Sampling, Sensor
View B-B
View A-A
A-A
C-C
MACHINE COMPONENT LOCATIONS
Left Side Front
Right Side Bottom Up
View C-C
B-B
TANK
STICK LOWERING CONTROL VALVE
BOOM LOWERING CONTROL VALVE
BUCKET CYLINDER
20
16
25
24
2319
21 18
17
4
3029
32
22
5
41
6
13
40
UENR0401
36 Page, (Dimensions: 48 inches x 35 inches)
285-1768
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: 310-0371, CHANGE: 01, VERSION: HE
MEDIA NUMBER: UENR0401
THIS SCHEMATIC IS FOR THE 336E 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
CALLOUTS
Taps (Pressure, Sampling, Sensor - by letter)
Callout Number
(Machine Location from
Component LocationsTable)
Component
Name
Part Number
DRAIN / RETURN LINE
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
IDLER PUMP OUTPUT
DRIVE 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
SHUTTLE VALVE CONTROL CIRCUIT
BOOM CONTROL AND BOOM CYLINDER CIRCUIT
LEFT TRAVEL CONTROL AND LEFT TRAVEL MOTOR CIRCUIT
SWING CONTROL AND SWING MOTOR CIRCUIT
SWING BRAKE CONTROL CIRCUIT
YY
(52) VALVE GP - CONTROL
138-1234
(29) VALVE GP
LOAD CONTROL
(BOOM CYLINDER LH)
(30) VALVE GP
LOAD CONTROL
(BOOM CYLINDER RH)
(41) VALVE GP
LOAD CONTROL
(STICK CYLINDER)
(12) MOTOR GP
TRAVEL (LEFT)
(13) MOTOR GP
TRAVEL (RIGHT)
(21) SENSOR GP
PRESSURE
(OVERLOAD WARNING)
(16) SENSOR GP
PRESSURE
(NEGATIVE FLOW CONTROL)
(14) PUMP GP
PISTON
(MAIN HYDRAULIC)
(17) SENSOR GP
PRESSURE
(NEGATIVE FLOW CONTROL)
(7) FILTER AND VALVE GP
PILOT (HYDRAULIC OIL)
(9) FILTER GP
OIL (HYDRAULIC,
CASE DRAIN)
(15) SCREEN GP
HYDRAULIC
(8) FILTER GP
OIL (HYDRAULIC RETURN)
(27) TANK AND FILTER GP
HYDRAULIC
(1) ACCUMULATOR GP
HYDRAULIC (CHARGED)
(10) MANIFOLD GP
CONTROL
(PILOT OIL SUPPLY)
(36) VALVE GP
SHUTTLE
Do
a1
a2
a3
B2
A2
PG
A
PC
BKWD
FWD
BKWD
FWD
A
E
C
B
BP1
SP1
PUMP-S1
PUMP-S2
L2
L1
R1
R2
TRAVEL(L)
TRAVEL(R)
STR-TRAVEL
BOOM(1)
BOOM(2)
SWING
STICK(2)
STICK(1)
(FWD)
(FWD)
(BKWD)
(BKWD)
(DOWN)
(UP)
(UP)
(OUT)
(OUT)
(IN)
(IN)
R6
L3
(CLOSE)
(OPEN)
BUCKET
T
BT3
ST6
TP
TT
TRAVEL(L) TRAVEL(R)
(FWD)
(BKWD)
(FWD)
(BKWD)
T1
T5
T2
T4
T6
T3
(OUT) (IN) (R) (L) (CLOSE)(OPEN) (DOWN) (UP)
JLP
JLT
JRP
JRT
BOOM
BUCKET
STICK
SWING
JL1 JL3 JL2 JL4
JR4
JR2 JR3JR1
1
1
2
2
3
3
4
4
5
5
6
6
P
A
P
A
B
T
T
A1 A2 A3 A4 A5 A6 A7 A8
B1 B2 B3 B4 B5 B6 B7 B8C1 C2 C3 C4
(3) CONTROL GP
JOYSTICK (RH)
(33) VALVE GP
PILOT TRAVEL (WITH SHUTTLE)
(4) BOOM CYLINDER(6) STICK CYLINDER
(5) BUCKET CYLINDER
A
B
MU
DR
PG
SWING MOTOR
A1
B1
DR
AG
BG
TRAVEL MOTOR (LEFT)
TRAVEL MOTOR (RIGHT)
Pp3
B
A
B
A
AG
AG
BG
BG
T2
T2
T1
T1
Pp3
(26) SWIVEL GP
(11) MOTOR GP
SWING
DR6
T-OUT1
DR5
Pi2
DR4
DR3
P2 P-IN
PSA2
DR1
PSA1
DR2
T-OUT2
Pi1
PAC
OUT
PG
PC
IN
T
B2
B1
A2
A1
P
P1
Ps2Di
Ps1
S1 Dr1
Psv
a1
a3
a2
A1
A2
A4
Do
Pi1
Pi2
M
R3
R5
L5
L6
R4 L4
BP2
R3
SP2
L6
R5
L5
R4
L4
(39) VALVE GP
TRAVEL COUNTERBALANCE
(LEFT)
X
X
Dr
Pi
T
CYL
CV
X
Dr
CV
CYL
Pi
T
X
T
CV
Pi
CYL
DR
BP2
SP2
(22) SENSOR GP
PRESSURE
(OVERLOAD WARNING)
(32) VALVE GP
MANUAL (BOOM LOWER)
STRAIGHT
TRAVEL SOL
NFC 1
LIMIT EPRV
NFC 2
LIMIT EPRV
BOOM REGEN
REPRV
(24) SWITCH AS
PRESSURE
(LEFT TRAVEL)
(25) SWITCH AS
PRESSURE
(RIGHT TRAVEL)
335-0512
338-6971
323-7762
319-4407
319-4407
(2) CONTROL GP
JOYSTICK (LH)
323-7948
323-7947
334-9973
(38) VALVE GP
SWING CUSHION
158-9085
322-8714
(40) VALVE GP
TRAVEL COUNTERBALANCE
(RIGHT)
234-4440
310-0107
(35) VALVE GP
PUMP CONTROL
323-7894
(37) VALVE GP
SOLENOID (WITH BLOCK)
(BOOM LOWERING)
(19) SENSOR GP
PRESSURE
(OVERLOAD WARNING)
338-6970
(20) SENSOR GP
PRESSURE
(OVERLOAD WARNING)
338-6970
(23) SWITCH AS
PRESSURE
319-4407
(31) VALVE GP
MAIN CONTROL
335-0240
(28) VALVE GP
CHECK
323-7502
(34) VALVE GP
PRESSURE REDUCING
285-1613
(18) SENSOR GP
PRESSURE
(OVERLOAD WARNING)
338-6971
357-9766
357-4703 358-5972
PS
PRESS EPRV
SWING
PRIORITY SOL
TRAVEL
SPEED
SOL
SWING
BRAKE
SOL
HYD
LOCK
SOL
338-6971
263-1964
263-1964
271-6376
271-6376
322-8714
338-6970
349-4065
338-6970
158-8987
289-8194
326-4408
188-4145
319-9805
164-6981
215-5037
323-7560
