INTERACTIVE SCHEMATIC
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EC-C3
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E-C61
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©
2011 Caterpillar, All Rights Reserved
Printed in U.S.A.
UENR2175
November 2011
One-Way / One or Two Pump - Electric Control
336E Excavator
Hydraulic System - Attachment
YCE1-UP
YEP1-UP
BZY1-UP
TMZ1-UP
COMPONENT LOCATION
Description
Part
Number
Machine
Location
Schematic
Location
Accumulator Gp -Hydraulic (Charged) 164-6981 1 E-4
Control Gp -Joystick (LH) 323-7948 2 H-3
Control Gp -Joystick (RH) 323-7947 3 H-1
Cylinder Gp -Boom 358-5972 4 J-9
Cylinder Gp -Bucket 357-9766 5 J-10
Cylinder Gp -Stick 357-4703 6 J-11
Filter and Valve Gp -Pilot (Hydraulic Oil) 158-8987 7 B-6
Filter Gp -Oil (Hydraulic Return) 188-4145 8 A-7
Filter Gp -Oil (Hydraulic, Case Drain) 289-8194 9 A-6
Manifold Gp -Control (Pilot Oil Supply) 215-5037 10 E-5
Manifold/Solenoid Gp (Heavy Lift) 323-7895 11 E-4
Motor Gp -Swing 334-9973 12 J-7
Motor Gp -Travel (Left) 271-6376 13 J-6
Motor Gp -Travel (Right) 271-6376 14 J-4
Pump Gp -Piston (Main Hydraulic) 349-4065 15 C-5
Screen Gp -Hydraulic 326-4408 16 A-7
Sensor Gp -Pressure (Boom Down Ctrl) 338-6970 17 F-3
Sensor Gp -Pressure (Boom, Rod End) 338-6971 18 J-9
Sensor Gp -Pressure (Boom Up Ctrl) 338-6970 19 F-2
Sensor Gp -Pressure (Negative Flow Control) 338-6970 20 C-2
Sensor Gp -Pressure (Negative Flow Control) 338-6970 21 C-2
Sensor Gp -Pressure (Overload Warning) 338-6971 22 A-12
Sensor Gp -Pressure (Overload Warning) 338-6971 23 A-11
Sensor Gp -Pressure (Stick In Ctrl) 338-6970 24 F-1
Sensor Gp -Pressure (Stick Out Ctrl) 338-6970 25 F-2
Sensor Gp -Pressure (Swing Control) 338-6970 26 F-1
Switch As -Pressure (Implement) 319-4407 27 F-2
Switch As -Pressure (Left Travel) 319-4407 28 I-2
Switch As -Pressure (Right Travel) 319-4407 29 I-1
Swivel Gp 234-4440 30 I-5
Tank and Filter Gp -Hydraulic 319-9805 31 A-7
Valve Gp -Check 323-7502 32 F-10
Valve Gp -Pilot Travel (With Shuttle) 323-7762 33 J-1
Valve Gp -Pressure Reducing 285-1613 34 E-2
Valve Gp -Pump Control 310-0107 35 C-3
Valve Gp -Shuttle 323-7560 36 G-1
Valve Gp -Stick Drift Reduction 335-0200 37 E-9
Valve Gp -Swing Cushion 158-9085 38 I-7
Valve Gp -Travel Counterbalance (Left) 322-8714 39 I-6
Valve Gp -Travel Counterbalance (Right) 322-8714 40 I-4
Block 323-7604 41 B-14
Plate 199-2012 42 H-8
Sensor Gp -Pressure (Boom, Head End) 338-6971 43 I-9
Valve Gp -Check (Boom Float Up) 297-0371 44 H-8
Valve Gp -Load Control (Boom Cylinder LH) 263-1964 45 J-9
Valve Gp -Load Control (Boom Cylinder RH) 263-1964 46 J-8
Valve Gp -Main Control 335-0385 47 G-13
Valve Gp -Manual (Boom Lower) 335-0512 48 I-9
Valve Gp - Relief (Line, Work Tool) 177-2653 49 H-11
Valve Gp -Solenoid (Pressure Reducing) (Pilot Lines) 259-7430 50 G-5
Valve Gp -Solenoid and Pressure Reducing (Boom Lowering) 323-7894 51 F-4
336E STANDARD
Attachment: One-Way/One or Two Pump - Electric Control
TAP LOCATION
Tap
Number
Description
Schematic
Location
Do Pump Case Pressure C-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 Pressure (NFC1) C-2
B2 Idler Pump Negative Flow Pressure (NFC2) C-2
PG Pilot Pump Delivery Pressure B-6
AA pL7f, Attachment Extend Pilot Pressure (B1) G-5
BB pL7b, Attachment Extend Pilot Pressure (B2) G-5
CC Boom Lowering Valve Pressure F-4
DD Boom Regeneration Valve Pressure E-3
SOS Oil Sampling Port B-6
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: ONE WAY / ONE OR TWO PUMP - ELECTRIC CONTROL
SCHEMATIC PART NUMBER: 352-7175, CHANGE: 00, VERSION: HE
MEDIA NUMBER: UENR2175
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
Attachment
Air Line
CALLOUTS
Taps (Pressure, Sampling, Sensor - by letter)
YY
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
ATTACHMENT 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
IMPLEMENT PRESSURE SWITCH CIRCUIT
(33) VALVE GP
PILOT TRAVEL (WITH SHUTTLE)
323-7762
(38) VALVE GP
SWING CUSHION
158-9085
(10) MANIFOLD GP
CONTROL
(PILOT OIL SUPPLY)
215-5037
(39) VALVE GP
TRAVEL COUNTERBALANCE
(LEFT)
322-8714
6
a1
STRAIGHT
TRAVEL SOL
DR6
T-OUT1
DR5
Pi2
DR4
DR3
P2
P-IN
PSA2
DR1
PSA1
DR2
T-OUT2
Pi1
PAC
HYD LOCK
SOL
T
OUT
PG
PC
IN
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
P1
A2
P
A
B
T
T
ST
SP1
SWG
PRKG BK
CONTROL
(J-7)
2 SPEED
TRAVEL
CONTROL
(H-5)
P1
335-0385
A1
P
A1
A2
B2
B1
T
(50) VALVE GP
SOLENOID
(PRESSURE
REDUCING)
(PILOT LINES)
259-7430
P2
AUX
RETURN
(H-11)
NOTE B
HEAVY LIFT
SOL
MU
(H-8)
BLCV-Pi
(H-9)
BLCV-Dr
(H-9)
T
B2
B1
A2
A1
P
Ps2
Di
Ps1
S1
Dr1
Psv
a1
a3
a2
A1
A2
A4
Do
Pi1
Pi2
PUMP-S1 PUMP-S2
A
E
C
B
(EXT)
(RET)
(EXT)
DRAIN
FILTER
(H-5)
R.C.V-D
pR5f
L2
L1
R3
pR3b
pL2b
pL3f
pL5b
pL3b
pL4b
L5
L4
pL5f
pR1f
R5
R4
L6
pR6f
pR2b
pSR
R1
R2
SP2
SPi
pR3f
pR4b
BP2
pST
dST
P1
P2
pL6f
SDr
pL1f
pR5b
dR1b
T
R6
ST6
(IN)
STICK(2)
(OUT)
(CLOSE)
(OPEN)
(OUT)
BUCKET
STICK(1)
(IN)
(R)
(L)
(UP)
SWING
(UP)
BT3
L3
BOOM(1)
BOOM(2)
(DOWN)
(FWD)
TRAVEL(R)
(BKWD)
(FWD)
TRAVEL(L)
STR-TRAVEL
(BKWD)
R.C.V-D
dR1b
SDr
MF-P
dST
MF-TANK
pR5b
pL6f
pL3b
pL5f
pR5f
pL3f
pL4b
pR4b
pSR
pR6f
SPi
pR2bpL2bpL1fpR1f
pL5b pR3b
PD-Pi
PD-Dr
A1 A2 A3 A4 A5 A6 A7 A8
B1 C1 B2 B3 C2 B4 C3 B5 B6 B7 C4 B8
PRV-T
SOL1-T
PRV-T
MF-TANK
NFC-T
PD-DrPD-Pi
NFC-Pi
MF-PpST
DrR
DrR
pBR
pBR
SOL1-T
pL7fpL7b
HPi
SOL4-T
NFC1 NFC2
pL7f
pL7b
pR7f
pR7-Dr
L7
SOL6-T
HPi
NFC2
NFC1
NFC-Pi
NFC-T
P2
P1
SOL4-T
MU
DR
PG
SWING MOTOR
SWG
PRKG BK
CONTROL
(E-6)
(L)
(R)
DR
(44) VALVE GP
CHECK
(BOOM
FLOAT UP)
297-0371
A
Dr
BOOM DOWN
ELE CHECK SOL
A
B
A1
B1
AG
BG
SINGLE
SINGLE
(6) STICK CYLINDER
(5) BUCKET CYLINDER
BLCV-Dr
(B-7)
BLCV-Pi
(F-2)
MU
(E-14)
TRAVEL MOTOR (LEFT)
TRAVEL MOTOR (RIGHT)
Pp3
B
A
B
A
AG
AG
BG
BG
T2
T2
T1
T1
Pp3
(FWD)
(FWD)
(BKWD)
(BKWD)
2 SPEED
TRAVEL
CONTROL
(F-6)
DRAIN
FILTER
(A-6)
(4) BOOM CYLINDER
X
X
Dr
Pi
T
CYL
CV
X
Dr
CV
CYL
Pi
T
X
R4L4
L7
L5L6 R5SP2
R1L1 L2 R2
BP2
R3
Do
PG
a3
a2
A2
B2
BOOM UP ELE
CHECK SOL
357-4703
357-9766
358-5972
(45) VALVE GP
LOAD CONTROL
(BOOM CYLINDER LH)
263-1964
BOOM REGEN
REPRV
(34) VALVE GP
PRESSURE
REDUCING
285-1613
(2) CONTROL GP
JOYSTICK (LH)
323-7948
(47) VALVE GP
MAIN CONTROL
AA
BB
DD
(49) VALVE GP
RELIEF
(LINE, WORK TOOL)
177-2653
(22) SENSOR GP
PRESSURE
(OVERLOAD WARNING)
338-6971
(23) SENSOR GP
PRESSURE
(OVERLOAD WARNING)
338-6971
SWING
PRIORITY SOL
(32) VALVE GP
CHECK
323-7502
(48) VALVE GP
MANUAL
(BOOM LOWER)
335-0512
(42) PLATE
199-2012
(18) SENSOR GP
PRESSURE
(BOOM,
ROD END)
338-6971
(46) VALVE GP
LOAD CONTROL
(BOOM CYLINDER RH)
263-1964
(43) SENSOR GP
PRESSURE
(BOOM, HEAD END)
338-6971
(31) TANK AND FILTER GP
HYDRAULIC
319-9805
(8) FILTER GP
OIL
(HYDRAULIC RETURN)
188-4145
(16) SCREEN GP
HYDRAULIC
326-4408
(12) MOTOR GP
SWING
334-9973
(13) MOTOR GP
TRAVEL (LEFT)
271-6376
SWING BREAK
SOL
TRAVEL SPEED
CHANGE SOL
(7) FILTER AND VALVE GP
PILOT (HYDRAULIC OIL)
158-8987
(9) FILTER GP
OIL (HYDRAULIC,
CASE DRAIN)
289-8194
(15) PUMP GP
PISTON
(MAIN HYDRAULIC)
349-4065
ATT STEM 2
EXTEND EPRV
ATT STEM 1
EXTEND EPRV
(30) SWIVEL GP
234-4440
(14) MOTOR GP
TRAVEL (RIGHT)
271-6376
322-8714
(40) VALVE GP
TRAVEL COUNTERBALANCE
(RIGHT)
(1) ACCUMULATOR GP
HYDRAULIC (CHARGED)
164-6981
PS
PRESS EPRV
NFC 2
LIMIT EPRV
NFC 1
LIMIT EPRV
310-0107
(35) VALVE GP
PUMP CONTROL
(17) SENSOR GP
PRESSURE
(BOOM DOWN CTRL)
338-6970
(19) SENSOR GP
PRESSURE
(BOOM UP CTRL)
(28) SWITCH AS
PRESSURE
(LEFT TRAVEL)
319-4407
(27) SWITCH AS
PRESSURE
(IMPLEMENT)
319-4407
(21) SENSOR GP
PRESSURE
(NEGATIVE FLOW CONTROL)
338-6970
(20) SENSOR GP
PRESSURE
(NEGATIVE FLOW CONTROL)
338-6970
(26) SENSOR GP
PRESSURE
(SWING
CONTROL)
338-6970
(25) SENSOR GP
PRESSURE
(STICK OUT CTRL)
(24) SENSOR GP
PRESSURE
(STICK IN CTRL)
(36) VALVE GP
SHUTTLE
323-7560
(3) CONTROL GP
JOYSTICK (RH)
323-7947
(29) SWITCH AS
PRESSURE
(RIGHT TRAVEL)
319-4407
(11) MANIFOLD/SOLENOID GP
HEAVY LIFT
323-7895
338-6970
(41) BLOCK GP
323-7604
(37) VALVE GP
STICK DRIFT
REDUCTION
335-0200
338-6970
338-6970
pR7-Dr
BOOM DOWN
REPRV (S1)
P
SOL6-T
pR3f
CC
(51) VALVE GP
SOLENOID AND
PRESSURE
REDUCING
(BOOM LOWERING)
323-7894
AUX
RETURN
(H-11)
NOTE A
AUX
RETURN
(F-9), (G-9)
pR7f
R7
SOS
RIGHT SIDE ACCESS PANEL
FRONT
SOS
PG
B2 A2
a2
a3a1
Do
35
21
20
15
9
7
VIEW ALL CALLOUTS
TOP DOWN VIEW - CAB
FRONT
36
3329
28
2726
19
17
3
2
VIEW ALL CALLOUTS

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