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RENR7366-02March 2012
385C ExcavatorHydraulic SystemEDA1-UPKGB1-UPKBC1-UPSBE1-UPT2E1-UPKKK1-UPJCM1-UPMNZ1-UP
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)
PRESSURECOMPENSATION
PUMP(VARIABLE & PRESSURE
COMPENSATED)
MEASUREMENT
PRESSURE TEMPERATURE FLOW
ROTATING SHAFTS
UNIDIRECTIONAL BIDIRECTIONAL
PUSH - PULL LEVER PEDALGENERAL MANUAL PUSH BUTTON SPRING
FIXEDDISPLACEMENT
VARIABLE DISPLACEMENTNON-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
BASICSYMBOL
SPRINGLOADED
CHECK VALVES
2 POSITIONINFINITE
POSITIONING
FLOW IN ONEDIRECTION
FLOW INEITHER
DIRECTION
3 POSITION
CROSSFLOW
PARALLELFLOW
INTERNAL PASSAGEWAYS
NORMAL POSITION
A B
P T
A B
P TSHIFTED POSITION INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOTCONTROLLED
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 TRIANGLESHYDRAULIC PNEUMATIC
INTERNALSUPPLY PRESSURE
COMPLETE
FIXEDDISPLACEMENT
VARIABLE DISPLACEMENTNON-COMPENSATED
HYDRAULIC SYMBOLS (ELECTRICAL)
ELECTRICAL SYMBOLS TABLE
325-AG135 PK-14
HARNESS IDENTIFICATION CODE THIS EXAMPLEINDICATES WIRE 135 IN HARNESS “AG”
325-PK-14
WIRE GAUGE
WIRE COLOR
CIRCUIT NUMBERIDENTIFICATION
WIRE NUMBER IDENTIFICATION CODES
CURRENT STANDARD
PREVIOUS STANDARD
ELECTRICAL SCHEMATIC EXAMPLE HYDRAULIC SCHEMATIC EXAMPLE
325-PK
WIRE COLORCIRCUIT NUMBER
IDENTIFICATION
B
WIRE
WIRE
(EXAMPLE VALVE)
CURRENT STANDARD
TRANSDUCER(FLUID)
MELECTRIC MOTORTRANSDUCER
(GAS / AIR)
G
GENERATOR
PRESSURE SWITCH ELECTRICAL WIREPRESSURE SWITCH(ADJUSTABLE)
TEMPERATURESWITCH
PRESSURESWITCH
TEMPERATURESWITCH
LEVELSWITCH
FLOWSWITCH
ELECTRICAL SYMBOLS (ELECTRICAL)
A
CIRCUIT NUMBERIDENTIFICATION
WIRECOLOR
WIRE GAUGE
T
RE
NR
7366-0
22
4 P
ag
e,
(Dim
en
sio
ns
: 3
4 i
nc
he
s x
28
in
ch
es
)
Description PartNumber
MachineLocation
SchematicLocation
Accumulator & Mtg Gp - Hydraulic (Pilot) 160-4138Accumulator Gp - Hydraulic 215-4905
Filter Gp - Oil 185-0336259-06816E-5534234-4454
Motor Gp - Piston (HYdraulic Oil Cooler Fan) 247-8978Motor Gp - Piston (Hydraulic Oil Cooler) 225-4614Motor Gp - Piston (Travel) 209-5895Motor Gp - Swing (Front) 234-4535Motor Gp - Swing (Rear) 234-4537Pump - Gp - Piston (Main Hydraulic) 155-9205Pump Gp - Gear (Pilot) 155-9222Pump Gp - Piston (Fan Motor) 170-9918Pump Gp - Piston (Swing) 259-0784Sensor As - Pressure (Swing Pump) 221-8869
Swivel Gp 156-0622Valve Gp - Check (Hydraulic Fan Motor, Radiator) 173-3429Valve Gp - Check (Return) 201-9381
201-9382Valve Gp - Control (Swing) 241-8929Valve Gp - Main Control 230-0080Valve Gp - Manifold & Reducing (Pilot Oil) 140-0736Valve Gp - Swing Cushion 241-8929Valve Gp - Travel Counterbalance 155-9200
12
678910111213141516171819
212223242526272829
E-3C-7
B-7A-7
A-6, A-7B-7B-6B-6
F-4, F-5F-2F-3
A-4, A-5A-3A-3
A-2, A-3B-3
E-5B-6C-1C-7E-3
C-1 Thru C-7D-4E-3
E-4, E-5
Component Locations
11
7
2210
2912
2514
1328
21271
24
1719
1618 15
2068
1229
9
1719
1618
1522
1020
86
2
72514
1328
2111
127
1229
924 26
97
1
27
26
27
BB
CC
19
18
17
16
SOS
PILOT / FAN / SWING PUMPS
AA
Tap LocationsPressure, Sampling, and Sensor
TapNumber Description Schematic
LocationAA Pilot Manifold Pressure D-3BB Pilot Pump Delivery Pressure B-3CC Swing Pump Delivery Pressure B-3DD Front Pump Delivery Pressure B-5EE Rear Pump Delivery Pressure B-4
SOS Hydraulic Oil Sampling Port B-3
A
A
EE DD
20
15
17Sensor As - Pressure (Main Pump) 221-8869 20 B-5
2326
2
23
Cylinder Gp - Boom Note A 3 F-6Cylinder Gp - Bucket Note A 4 F-7Cylinder Gp - Stick Note A 5 F-7
NOTE A: Check the parts manual for the correct cylinder part number.
3
3
5
4
3 5
4
COMPONENT LOCATIONS FILTER GP
VALVE GP - MANIFOLD & REDUCING
PUMP GP MAIN HYDRAULIC
VIEW A
15
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Attachment
Air Line
CALLOUTS
Taps (Pressure, Sampling, Sensor - by letter)
Components (By number)
YY
52
DRAIN / RETURN TO TANK
HYDRAULIC CIRCUIT COLOR DESCRIPTIONSMAIN PUMP OUTPUT
SWING PUMP OUPUT
PILOT PUMP OUTPUT
RIGHT HAND TRAVEL MOTOR CONTROL CIRCUIT
FAN PUMP OUTPUT
MAIN PUMP LOAD SENSE PRESSURE
SWING BRAKE CONTROL CIRCUITDRAIN / RETURN TO SUPPLY
MAIN PUMP LOAD SENSE CIRCUITSUPPLY LINE
BUCKET CONTROL CIRCUIT
TRAVEL SPEED CONTROL CIRCUIT
STICK CYLINDER CONTROL CIRCUITLEFT HAND TRAVEL MOTOR CONTROL CIRCUIT
BOOM CYLINDER CONTROL CIRCUIT
SWING MOTOR CONTROL CIRCUIT
RE
NR
7366-0
22
4 P
ag
e,
(Dim
en
sio
ns
: 3
4 i
nc
he
s x
28
in
ch
es
)
THIS SCHEMATIC IS FOR THE 385C EXCAVATORRENR7366-02 PART NUMBER: 225-4836, CHANGE: 04, VERSION: VComponents are shown installed on a fully operable machine.
Refer to the appropriate Service Manual for Troubleshooting, Specifications.
A
B
C
D
E
F
1234567
A
B
C
D
E
F
1234567
MOTOR GPRH TRAVEL209-5895
TRAVEL MOTOR (LEFT)TRAVEL MOTOR (RIGHT)
SWING MOTOR (REAR) SWING MOTOR (FRONT)
SENSOR AS.MAIN PUMP221-8869
PUMP GPMAIN HYDRAULIC155-9205
SENSOR AS.SWING PUMP221-8869
PUMP GPGEAR(PILOT)155-9222
PUMP GPPISTON(FAN MOTOR)170-9918
PUMP GPPISTON(SWING)259-0784
SWIVEL GP156-0622
ACCUMULATOR GP160-4138
VALVE GPPILOT MANIFOLD& REDUCING140-0736
VALVE GPMAIN CONTROL230-0080
FILTER GPPILOT OIL185-0336
VALVE GPCHECK201-9381
VALVE GPCHECK(RETURN)201-9382
FILTER GPRETURN259-0681
FILTER GPRETURN234-4454
FILTER GPCASE DRAIN6E-5534
MOTOR GPHYDRAULICOIL COOLERFAN247-8978
VALVE GPCHECK173-3429
MOTOR GPPISTON(HYDRAULICOIL COOLER)225-4614
ACCUMULATOR GP215-4905
Pi6
Pi5 Pi4 Pi3
Pi2 Pi1
PS
A4
PS
A3
PS
A2
PS
A1
PAC
PG
DR
1
DR
2
DR
3
DR
4
DR
5
DR
6
PIN
TOU
T
Qmax Qmin
AS R T1 T2
L1
L2
M1SDRDR1S
A
MG
PS1 a1 P1 P2 a2PSg
LS2
D2B1D1
LS1
PF PR
BL1AL1 AR1
BR1
PF
PR
BR1 AR1 BL1 AL1
L2
L3
DR
DR1
A
B
DRDR1
L2
L3
B
A
FWD
FWD
IN
RE
V
RE
V
OU
TS
TIC
K
TRAV
EL(
L)
TRAV
EL(
R)
CLO
SE
UP
OP
EN
DO
WN
BO
OM
BU
CK
ET
ATC
H
LS
bL1bR1aL4
aL1aR1bL4
DR4DR5
R2
DR3
PS3
DR1aR3aL3aL2
bR3bL3bL2R1
DR2
PS2
DR4PS4
BL2 AL2
PRPD
PG1 PG2
DB
PB
M
B A
PA
M1 M2
SDr1
SP
T P SDr2
R
M
PAPB
PG DB
Pi
Dr
Dr
BG
BA
AG
Pi
PG
A B
P
Pi
Dr
Dr
BG
B A
AG
Pi
P
PG
B A
MOTOR GPLH TRAVEL209-5895
VALVE GPRH TRAVELCOUNTERBALANCE155-9200
VALVE GPLH TRAVELCOUNTERBALANCE155-9200
MOTOR GPSWING (REAR)234-4537
MOTOR GPSWING (FRONT)234-4535
VALVE GPSWING CUSHION116-3420
VALVE GPCONTROL(SWING)241-8929
AA
BB
SOSCC
EEDD
STICK CYLINDERBUCKET CYLINDER BOOM CYLINDER
AR3 BR3AL4 BL4BL3 AL3
AL4BR3
BL4AR3
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