RENR7366-02
March 2012
385C Excavator
Hydraulic System
EDA1-UP
KGB1-UP
KBC1-UP
SBE1-UP
T2E1-UP
KKK1-UP
JCM1-UP
MNZ1-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)
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
RENR7366-02
24 Page, (Dimensions: 34 inches x 28 inches)
Description
Part
Number
Machine
Location
Schematic
Location
Accumulator & Mtg Gp - Hydraulic (Pilot) 160-4138
Accumulator Gp - Hydraulic 215-4905
Filter Gp - Oil 185-0336
259-0681
6E-5534
234-4454
Motor Gp - Piston (HYdraulic Oil Cooler Fan) 247-8978
Motor Gp - Piston (Hydraulic Oil Cooler) 225-4614
Motor Gp - Piston (Travel) 209-5895
Motor Gp - Swing (Front) 234-4535
Motor Gp - Swing (Rear) 234-4537
Pump - Gp - Piston (Main Hydraulic) 155-9205
Pump Gp - Gear (Pilot) 155-9222
Pump Gp - Piston (Fan Motor) 170-9918
Pump Gp - Piston (Swing) 259-0784
Sensor As - Pressure (Swing Pump) 221-8869
Swivel Gp 156-0622
Valve Gp - Check (Hydraulic Fan Motor, Radiator) 173-3429
Valve Gp - Check (Return) 201-9381
201-9382
Valve Gp - Control (Swing) 241-8929
Valve Gp - Main Control 230-0080
Valve Gp - Manifold & Reducing (Pilot Oil) 140-0736
Valve Gp - Swing Cushion 241-8929
Valve Gp - Travel Counterbalance 155-9200
1
2
6
7
8
9
10
11
12
13
14
15
16
17
18
19
21
22
23
24
25
26
27
28
29
E-3
C-7
B-7
A-7
A-6, A-7
B-7
B-6
B-6
F-4, F-5
F-2
F-3
A-4, A-5
A-3
A-3
A-2, A-3
B-3
E-5
B-6
C-1
C-7
E-3
C-1 Thru C-7
D-4
E-3
E-4, E-5
Component Locations
11
7
22
10
29
12
25
14
13
28
21
27
1
24
17
19
16
18 15
20
6
8
12
29
9
17
19
16
18
15
22
10
20
8
6
2
7
25
14
13
28
2111
1
27
12
29
9
24 26
9
7
1
27
26
27
BB
CC
19
18
17
16
SOS
PILOT / FAN / SWING PUMPS
AA
Tap Locations
Pressure, Sampling, and Sensor
Tap
Number
Description
Schematic
Location
AA Pilot Manifold Pressure D-3
BB Pilot Pump Delivery Pressure B-3
CC Swing Pump Delivery Pressure B-3
DD Front Pump Delivery Pressure B-5
EE Rear Pump Delivery Pressure B-4
SOS Hydraulic Oil Sampling
Port B-3
A
A
EE
DD
20
15
17
Sensor As - Pressure (Main Pump) 221-8869 20 B-5
23
26
2
23
Cylinder Gp - Boom Note A 3 F-6
Cylinder Gp - Bucket Note A 4 F-7
Cylinder Gp - Stick Note A 5 F-7
NOTE A: Check the parts manual for the correct cylinder part number.
3
3
5
4
35
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 DESCRIPTIONS
MAIN 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 CIRCUIT
DRAIN / RETURN TO SUPPLY
MAIN PUMP LOAD SENSE CIRCUIT
SUPPLY LINE
BUCKET CONTROL CIRCUIT
TRAVEL SPEED CONTROL CIRCUIT
STICK CYLINDER CONTROL CIRCUIT
LEFT HAND TRAVEL MOTOR CONTROL CIRCUIT
BOOM CYLINDER CONTROL CIRCUIT
SWING MOTOR CONTROL CIRCUIT
RENR7366-02
24 Page, (Dimensions: 34 inches x 28 inches)
THIS SCHEMATIC IS FOR THE 385C EXCAVATOR
RENR7366-02
PART NUMBER: 225-4836, CHANGE: 04, VERSION: V
Components 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 GP
RH TRAVEL
209-5895
TRAVEL MOTOR (LEFT)TRAVEL MOTOR (RIGHT)
SWING MOTOR (REAR) SWING MOTOR (FRONT)
SENSOR AS.
MAIN PUMP
221-8869
PUMP GP
MAIN HYDRAULIC
155-9205
SENSOR AS.
SWING PUMP
221-8869
PUMP GP
GEAR
(PILOT)
155-9222
PUMP GP
PISTON
(FAN MOTOR)
170-9918
PUMP GP
PISTON
(SWING)
259-0784
SWIVEL GP
156-0622
ACCUMULATOR GP
160-4138
VALVE GP
PILOT MANIFOLD
& REDUCING
140-0736
VALVE GP
MAIN CONTROL
230-0080
FILTER GP
PILOT OIL
185-0336
VALVE GP
CHECK
201-9381
VALVE GP
CHECK
(RETURN)
201-9382
FILTER GP
RETURN
259-0681
FILTER GP
RETURN
234-4454
FILTER GP
CASE DRAIN
6E-5534
MOTOR GP
HYDRAULIC
OIL COOLER
FAN
247-8978
VALVE GP
CHECK
173-3429
MOTOR GP
PISTON
(HYDRAULIC
OIL COOLER)
225-4614
ACCUMULATOR GP
215-4905
Pi6
Pi5
Pi4
Pi3
Pi2
Pi1
PSA4
PSA3
PSA2
PSA1
PAC
PG
DR1
DR2
DR3
DR4
DR5
DR6
PIN
TOUT
Qmax Qmin
AS
R
T1
T2
L1
L2
M1
S
DR
DR1
S
A
M
G
PS1
a1
P1
P2
a2
PSg
LS2
D2B1D1
LS1
PF
PR
BL1
AL1 AR1
BR1
PF
PR
BR1 AR1 BL1 AL1
L2
L3
DR
DR1
A
B
DR
DR1
L2
L3
B
A
FWD
FWD
IN
REV
REV
OUT
STICK
TRAVEL(L)
TRAVEL(R)
CLOSE
UP
OPEN
DOWN
BOOM
BUCKET
ATCH
LS
bL1bR1aL4
aL1aR1bL4
DR4DR5
R2
DR3
PS3
DR1
aR3aL3aL2
bR3bL3bL2
R1
DR2
PS2
DR4PS4
BL2 AL2
PR
PD
PG1
PG2
DB
PB
M
B
A
PA
M1 M2
SDr1
SP
T P SDr2
R
M
PA
PB
PG
DB
Pi
Dr
Dr
BG
B
A
AG
Pi
PG
A
B
P
Pi
Dr
Dr
BG
B
A
AG
Pi
P
PG
B
A
MOTOR GP
LH TRAVEL
209-5895
VALVE GP
RH TRAVEL
COUNTERBALANCE
155-9200
VALVE GP
LH TRAVEL
COUNTERBALANCE
155-9200
MOTOR GP
SWING (REAR)
234-4537
MOTOR GP
SWING (FRONT)
234-4535
VALVE GP
SWING CUSHION
116-3420
VALVE GP
CONTROL
(SWING)
241-8929
AA
BB
SOS
CC
EEDD
STICK CYLINDER
BUCKET CYLINDER
BOOM CYLINDER
AR3
BR3
AL4
BL4
BL3 AL3
AL4BR3
BL4
AR3
