RENR7249-01
November 2010
385C Excavator and 385C MHPU
Hydraulic System - Attachment
385C:
EDA1-UP
MMA1-UP
KGB1-UP
KBC1-UP
SBE1-UP
T2E1-UP
T2F1-UP
KKK1-UP
EAM1-UP
JCM1-UP
GLT1-UP
WAW1-UP
MNZ1-UP
Printed in U.S.A.© 2010 Caterpillar, All Rights Reserved
385C MHPU:
M3W-1UP
Reverse Fan
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
RENR7249-01
24 Page, (Dimensions: 34 inches x 28 inches)
31
9
24
10
23
13
12
27
20
30
28
22
16
19
14
17 15
18
6
7
11
26
8
16
19
14
17
15
18
7
6
2
9
23
13
12
27
2031
1
29
10
24
8
22 25
8
9
1
28
25
28
BB
CC
19
17
16
14
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
18
15
16
21
25
2
21
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
Description
Part
Number
Machine
Location
Schematic
Location
Accumulator and Mtg Gp - Hydraulic (Pilot) Note B
1
E-3
Accumulator Gp - Hydraulic Note B
2
C-7
Cylinder Gp - Boom Note A
3
F-6
Cylinder Gp - Bucket Note A
4
F-7
Cylinder Gp - Stick Note A
5
F-7
Filter Gp - Oil (Case Drain) Note B
6
A-6, A-7
Filter Gp - Oil (Pilot) Note B
7
B-7
Filter Gp - Oil (Return) Note B
8
B-7
Filter Gp - Oil (Return) Note B
9
A-7
Motor Gp - LH Travel Note B
10
F-4
Motor Gp
- RH Travel Note B
11
F-5
Motor Gp - Swing (Front) Note B
12
F-2
Motor Gp - Swing (Rear) Note B
13
F-3
Pump Gp - Gear (Pilot) Note B
14
A-4
Pump Gp - Main Hydraulic Note B
15
A-4, A-5
Pump Gp - Piston (Fan Motor) Note B
16
A-3
Pump Gp - Piston (Swing) Note B
17
B-2
Sensor As - Pressure (Main Pump) Note B
18
B-5
Sensor As - Pressure (Swing Pump) Note B
19
B-3
Swivel Gp Note B
20
E-5
Valve Gp - Check (Return) Note B
21
C-1
Valve Gp - Check (Return) No
te B
22
C-7
Valve Gp - Control (Swing) Note B
23
E-3
Valve Gp - LH Travel Counterbalance Note B
24
E-4
Valve Gp - Main Control Note B
25
D-1 Thru D-7
Valve Gp - RH Travel Counterbalance Note B
26
E-5
Valve Gp - Swing Cushion Note B
27
E-2
Valve Gp - Pilot Manifold and Reducing Note B
28
E-4
Valve Gp - Solenoid (Reversing Fan) 242-6880
29
E-7
Motor Gp - Piston (Hydraulic Fan) 200-3252
30
A-6
Valve Gp - Control (Reversible Flow Fan) 234-4624
31
A-6
Va
lve Gp - Control (Reversible Fan) 274-2553
32
B-6
Component Locations
Attachment: Reverse Fan
Note B: Part numbers are located on the main Hydraulic Schematic according
to the effectivity of the machine.
29
132
28
30
11
26
32
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 OUTPUT
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
RENR7249-01
24 Page, (Dimensions: 34 inches x 28 inches)
THIS SCHEMATIC IS FOR THE 385C EXCAVATOR AND
385C MHPU HYDRAULIC SYSTEM
ATTACHMENT: REVERSE FAN
PART NUMBER: 239-8960, CHANGE: 01, VERSION: HE
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
TRAVEL MOTOR (LEFT)TRAVEL MOTOR (RIGHT)
SWING MOTOR (REAR) SWING MOTOR (FRONT)
SENSOR AS.
MAIN PUMP
PUMP GP
MAIN HYDRAULIC
SENSOR AS.
SWING PUMP
PUMP GP
GEAR
(PILOT)
PUMP GP
PISTON
(FAN MOTOR)
PUMP GP
PISTON
(SWING)
SWIVEL GP
ACCUMULATOR GP
VALVE GP
PILOT MANIFOLD
& REDUCING
VALVE GP
MAIN CONTROL
FILTER GP
PILOT OIL
VALVE GP
CHECK
(RETURN)
VALVE GP
CHECK
(RETURN)
FILTER GP
RETURN
FILTER GP
RETURN
FILTER GP
CASE DRAIN
ACCUMULATOR GP
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
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
VALVE GP
RH TRAVEL
COUNTERBALANCE
VALVE GP
LH TRAVEL
COUNTERBALANCE
MOTOR GP
SWING (REAR)
MOTOR GP
SWING (FRONT)
VALVE GP
SWING CUSHION
VALVE GP
CONTROL
(SWING)
AA
BB
SOS
CC
EEDD
STICK CYLINDER
BUCKET CYLINDER
BOOM CYLINDER
AR3
BR3
AL4
BL4
BL3 AL3
AL4BR3
BL4
AR3
MOTOR GP
PISTON
(HYDRAULIC FAN)
200-3252
VALVE GP
CONTROL
(REVERSIBLE FAN)
274-2553
VALVE GP
SOLENOID
(REVERSING FAN)
242-6880
P
T
M
P
T
Dr
A
B
B
A
A
B
B
A
S
S
SPi
T
L2
L3
DR
DR1
L2
L3
DR
DR1
VALVE GP
CONTROL
(REVERSIBLE FLOW FAN)
234-4624
