KENR7986-03
October 2012
Standard and Heavy Lift
336E Excavator
Hydraulic System
KED1-197
YCE1-317
TEG1-162
FJH1-344
GTJ1-124
JRJ1-210
YEP1-294
CMR1-164
BZY1-1204
TMZ1-291
Printed in U.S.A.© 2012 Caterpillar, All Rights Reserved
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)
PUMP
(2 - SECTION)
SPRING
(ADJUSTABLE)
VARIABILITY LINE RESTRICTION
(VARIABLE)
PRESSURE
COMPENSATION
PUMP
(VARIABLE & PRESSURE
COMPENSATED)
MEASUREMENT
PRESSURE TEMPERATURE FLOW
ROTATING SHAFTS
UNIDIRECTIONAL BIDIRECTIONAL
PUSH - PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
VALVE ENVELOPES VALVE PORTS
FLUID CONDITIONERPUMP OR MOTOR
FLUID POWER SYMBOLS
UNIDIRECTIONAL
BIDIRECTIONAL
RELEASED PRESSURE
EXTERNAL RETURN INTERNAL RETURN
REMOTE SUPPLY PRESSURE
SIMPLIFIED
HYDRAULIC PUMPS
ACCUMULATORS
SPRING LOADED GAS CHARGED
SOLENOID
OR MANUAL
SOLENOID
& PILOT
SOLENOID &
PILOT OR MANUAL
SOLENOID SERVO THERMAL DETENT
HYDRAULIC & PNEUMATIC CYLINDERS
DOUBLE ACTINGSINGLE ACTING
BASIC
SYMBOL
SPRING
LOADED
CHECK VALVES
2 POSITION
INFINITE
POSITIONING
FLOW IN ONE
DIRECTION
FLOW IN
EITHER
DIRECTION
3 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
MAIN AUX
LINE RESTRICTION
(VARIABLE & PRESSURE
COMPENSATED)
MANUAL CONTROL SYMBOLS
HYDRAULIC MOTORS
FLUID STORAGE RESERVOIRS
CROSSING & JOINING LINES
VALVES
PILOT CONTROL SYMBOLS
COMBINATION CONTROLS
BASIC COMPONENT SYMBOLS
ENERGY TRIANGLES
HYDRAULIC PNEUMATIC
INTERNAL
SUPPLY PRESSURE
COMPLETE
FIXED
DISPLACEMENT
VARIABLE DISPLACEMENT
NON-COMPENSATED
HYDRAULIC SYMBOLS (ELECTRICAL)
ELECTRICAL SYMBOLS TABLE
325-AG135 PK-14
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
WIRE
WIRE
(EXAMPLE VALVE)
CURRENT STANDARD
TRANSDUCER
(FLUID)
M
ELECTRIC MOTORTRANSDUCER
(GAS / AIR)
G
GENERATOR
PRESSURE SWITCH ELECTRICAL WIREPRESSURE SWITCH
(ADJUSTABLE)
TEMPERATURE
SWITCH
PRESSURE
SWITCH
TEMPERATURE
SWITCH
LEVEL
SWITCH
FLOW
SWITCH
ELECTRICAL SYMBOLS (ELECTRICAL)
A
CIRCUIT NUMBER
IDENTIFICATION
WIRE
COLOR
WIRE GAUGE
T
KENR7986-03
30 Page, (Dimensions: 39 inches x 28 inches)
MAIN PUMPOPERATOR STATION
MACHINE VIEW
MAIN VALVE (FRONT VIEW)
MAIN VALVE (REAR VIEW)
37
38
6
5
4
36 26
16
24
32 25
3
17
2
2334
22
21
9 7
EE FF
GGHH DD
SOS BB
HYD.
TANK
8
101
30
AA
29
31
HYD.
TANK
CC
UNDER
PUMP
28
18 19
39
35
13
14 12
2033
HYD.
TANK
11
27
15
Description
Part
Number
Machine
Location
Schematic
Location
Accumulator Gp - Hydraulic (Charged) 164-6981 1 D-3
Control Gp - Joystick (LH) 323-7948 2 E-2
Control Gp - Joystick (RH) 323-7947 3 E-1
Cylinder Gp - Boom Note A 4 F-7
Cylinder Gp - Bucket Note A 5 F-8
Cylinder Gp - Stick Note A 6 F-8
Filter and Valve Gp - Pilot (Hydraulic Oil) 158-8987 7 B-4
Filter Gp - Oil (Hydraulic Return) 188-4145 8 A-5
Filter Gp - Oil (Hydraulic, Case Drain) 289-8194 9 A-4
Manifold Gp - Control 215-5037 10 D-3
Motor Gp - Swing 334-9973
11
F-5
Motor Gp - Travel (LH) 355-5668
12
F-4
Motor Gp - Travel (RH) 355-5668
13
F-3
Pump Gp - Main Hydraulic 369-9602
14
B-4
Sensor Gp - Pressure (Boom Cylinder Head) 338-6971
15
F-7
Sensor Gp - Pressure (Boom Down Control) 338-6970
16
D-2
Sensor Gp - Pressure (Drive Pump) 338-6971
17
A-7
Sensor Gp - Pressure (Driven Pump) 338-6971
18
A-6
Sensor Gp - Pressure (Negative F Cont, Drive Pump) 338-6971
19
B-2
Sensor Gp - Pressure (Negative F Cont, Driven Pump) 338-6971
20
B-2
Sensor Gp - Pressure (Swing Control) 338-6970
21
D-1
Switch As - Pressure (Implement) 319-4407
22
C-1
Switch As - Pressure (Travel, LH) 319-4407
23
F-2
Switch As - Pressure (Travel, RH) 319-4407
24
F-1
Swivel Gp 234-4440
25
E-3
Valve Gp - Check 352-7070
26
B-8
Valve Gp - Check (Oil Cooler Bypass) 323-7502
27
D-6
Valve Gp - Load Control (Boom Drift Reduction) 323-7610
28
A-8
Valve Gp - Load Control (Stick Drift Reduction) 335-0200
29
D-5
Valve Gp - Main Control
335-0240
30
A-6
Valve Gp - Pilot (Shuttle) 369-8502
31
F-1
Valve Gp - Shuttle 323-7560
32
D-1
Valve Gp - Solenoid and Press Reducing (Boom Regen) 323-7894
33
C-2
Valve Gp - Swing Cushion 158-9085
34
E-5
Valve Gp - Travel Counterbalance (LH) 322-8714
35
E-4
Valve Gp - Travel Counterbalance (RH) 322-8714
36
E-3
Valve Gp -Pressure Reducing (Boom Priority) 352-7065
37
C-1
Component Locations
Tap
Number
Description
Schematic
Location
AA Boom Regeneration Valve Pressure C-2
BB Pilot Pump Delivery Pressure A-5
CC Pump Case Drain Pressure B-4
DD Drive Pump Negative Flow Pressure (NFC1) B-2
EE Drive Pump Delivery Pressure B-3
FF Power Shift Pressure B-3
GG Idler Pump Delivery Pressure A-3
HH Idler Pump Negative Flow Pressure (NFC2) B-2
SOS Hydraulic Oil Sampling Port A-4
Tap Locations
Pressure, Sampling, and Sensor
335-0241
(Standard)
(Heavy Lift)
Note A: Refer to parts manual for specific cylinder information.
CAB
Valve Gp - Pump Control 310-0107 B-2
Manifold and Solenoid Gp - Control
(Heavy Lift, Boom Regen)
323-7895 C-4
38
39
KENR7986-03
30 Page, (Dimensions: 39 inches x 28 inches)
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.
SCHEMATIC PART NUMBER: 310-0216, CHANGE: 04, VERSION: HE
THIS SCHEMATIC IS FOR THE 336E EXCAVATOR HYDRAULIC SYSTEM
MEDIA NUMBER: KENR7986-03
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
PILOT PUMP OUTPUT
IDLER PUMP OUTPUT
HEAVY LIFT CIRCUIT
POWERSHIFT CONTROL CIRCUIT
SUPPLY LINE
STICK CYLINDER AND CONTROL CIRCUIT
LEFT TRAVEL CONTROL CIRCUIT
SWING CONTROL CIRCUIT
DRAIN / RETURN LINE
SWING BRAKE CONTROL CIRCUIT
DRIVE PUMP OUTPUT
TRAVEL SPEED CONTROL CIRCUIT
BUCKET CYLINDER AND CONTROL CIRCUIT
RIGHT TRAVEL CONTROL CIRCUIT
BOOM CYLINDER AND CONTROL CIRCUIT
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
CALLOUTS
Taps (Pressure, Sampling, Sensor - by letter)
YY
(52) VALVE GP - CONTROL
138-1234
Callout Number
(Machine Location from
Component Locations Table)
Component
Name
Part Number
IDENT CONNECTOR
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
20 HYD LOCK SOL
21 SWING PRIORITY SOL
22 HEAVY LIFT SOL
(16) SENSOR GP
PRESSURE (BOOM CYLINDER HEAD)
(19) SENSOR GP
PRESSURE (DRIVEN PUMP)
(18) SENSOR GP
PRESSURE (DRIVE PUMP)
(32) VALVE GP
PILOT (WITH SHUTTLE)
(24) SWITCH AS
PRESSURE (TRAVEL, LH)
(25) SWITCH AS
PRESSURE (TRAVEL, RH)
(2) CONTROL GP
JOYSTICK (LH)
(3) CONTROL GP
JOYSTICK (RH)
(26) SWIVEL GP
(37) VALVE GP
TRAVEL COUNTERBALANCE (LH)
(38) VALVE GP
TRAVEL COUNTERBALANCE (RH)
(14) MOTOR GP
TRAVEL (RH)
(13) MOTOR GP
TRAVEL (LH)
(12) MOTOR GP
SWING
(31) VALVE GP
MAIN CONTROL
(28) VALVE GP
CHECK (OIL COOLER BYPASS)
(30) VALVE GP
LOAD CONTROL
(STICK DRIFT REDUCTION)
(8) FILTER GP
OIL (HYDRAULIC RETURN)
(9) FILTER GP
OIL (HYDRAULIC, CASE DRAIN)
(7) FILTER AND VALVE GP
PILOT (HYDRAULIC OIL)
(15) PUMP GP
MAIN HYDRAULIC
(1) ACCUMULATOR GP
HYDRAULIC (CHARGED)
(10) MANIFOLD GP
CONTROL
(39) VALVE GP
PRESSURE REDUCING
(BOOM PRIORITY)
(34) VALVE GP
SHUTTLE
(17) SENSOR GP
PRESSURE
(BOOM DOWN CONTROL)
(22) SENSOR GP
PRESSURE
(SWING CONTROL)
(23) SWITCH AS
PRESSURE
(IMPLEMENT)
(29) VALVE GP
LOAD CONTROL
(BOOM DRIFT REDUCTION)
(27) VALVE GP
CHECK
(36) VALVE GP
SWING CUSHION
(11) MANIFOLD AND SOLENOID GP
CONTROL (HEAVY LIFT,
BOOM REGENERATION)
(33) VALVE GP
PUMP CONTROL
(21) SENSOR GP
PRESSURE
(NEGATIVE F CONT, DRIVEN PUMP)
(20) SENSOR GP
PRESSURE
(NEGATIVE F CONT, DRIVE PUMP)
(35) VALVE GP
SOLENOID AND PRESSURE REDUCING
(BOOM REGENERATION)
(4) CYLINDER GP
BOOM
(6) CYLINDER GP
STICK
(5) CYLINDER GP
BUCKET
335-0240
164-6981
352-6860 NOTE C
352-7065
323-7948
323-7947
369-8502
215-5037
323-7560
323-7502
322-8714
355-5668
234-4440
322-8714
355-5668
334-9973
188-4145
289-8194
158-8987
369-9602
20
17
18
19
323-7610
335-0200
158-9085
21
12
352-7070
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
B
T
A
B
DR
PG
SWING MOTOR
(L)
(R)
A1
B1
DR
AG
BG
T
OUT
PG
PC
IN
A
E
C
B
ST
SP1
BT
BP1
PUMP-S1
PUMP-S2
DR6
T-OUT1
DR5
Pi2
DR4
DR3
P2
P-IN
PSA2
DR1
PSA1
DR2
T-OUT2
Pi1
PAC
P1
Ps2
Di
Ps1
S1
Dr1
Psv
a1
a3
a2
A1
A2
A4
Do
Pi1
Pi2
TRAVEL MOTOR (LEFT)
TRAVEL MOTOR (RIGHT)
Pp3
B
A
B
A
AG
AG
BG
BG
T2
T2
T1
T1
Pp3
(FWD)
(FWD)
(BKWD)
(BKWD)
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
pR3f
BPi
L5 L6
R3
R5
BP2
SP2
R4L4
MU
R.C.V-D
MF-TANK
R.C.V-D
pR5f
L2
L1
R3
pR3b
pL2b
pL3f
pL5b
pL3b
pL4b
L5
L4
pL5f
pR1f
R5
R4
L6
pR6f
pR2b
pSR
MU
R1
R2
SP2
SPi
pR3f
pR4b
pST
dST
P1 P2
pL6f
SDr
pL1f
pR5b
dR1b
DrR
pBR
NFC2NFC1
T
R6
ST6
(IN)
STICK(2)
(OUT)
(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)
BP2
BPi
BDr
(OPEN)
(CLOSE)
PRV-T
MF-TANK
NFC-T
PD-Dr
PD-Pi
pST
NFC-Pi
BDr
SDr
P2
P1
R1L1 L2 R2
NFC1
NFC2
338-6971
338-6970
338-6970
319-4407
319-4407 319-4407
338-6971338-6971
EE
FF
GG
CC
SOL1-T
HPi
BB
SOS
HEAVY LIFT
NOTE C: FOR BC/AL REGULATION
335-0241
(Standard)
(Heavy Lift)
13
22
T
P2
P1
A2
A1
pBR
SOL1-T
HPi
13
P
A
T
pBR
SOL1-T
P1
P1
AA
323-7895
T
B2
B1
A2
A1
P
15
16
NFC-Pi
NFC-T
HH
DD
310-0107
338-6971
338-6971
DrR
dST
323-7894
