RENR7376-00
20 Page, REM
6
9
24B
23
5A
5B
24A
1
1
1
3
4
1
4
16
1
8
Component Locations
RENR7376
January 2005
385C Front Shovel Excavator
Hydraulic System
MMA1-UP
T2F1-UP
EAM1-UP
GLT1-UP
©
2005 Caterpillar
All Rights Reserved
Printed in U.S.A.
Description
Part
Number
Machine
Location
Schematic
Location
Filter Gp. - Case Drain 6E-5534 1 A-14
Valve Gp. - Relief 116-3420 2 G-7
Valve Gp. - Hydraulic Activation 140-0736 3 F-10
Valve Gp. - Travel Brake (Left & Right) 155-9200 4 G-9,G-12
Pump Gp. - Front & Rear 155-9205 5 A-10,A-11
Pump Gp. - Pilot 155-9222 6 A-9
Swivel Gp. 156-0622 7 G-11
Accumulator Gp. 160-4138 8 G-9
Pump Gp. - Fan 170-9918 9 B-8
Valve Gp. - Check 173-3429 10 B-12
Filter Gp. - Pilot 185-0336 11 A-14
Valve Gp. - Check (Back Pressure) 201-9381 12 D-5
Valve Gp. - Check (Bypass) 201-9382 13 D-14
Motor Gp. - Travel (Left & Right) 209-5895 14 I-9,I-12
Motor Gp. - Fan 209-6058 15 B-13
Accumulator Gp. 215-4905 16 D-15
Sensor As. - Pressure 221-8869 17 B-11
Motor Gp. - Fan 225-4614 18 B-13
Filter Gp. - Return 234-4454 19 B-14
Motor Gp. - Swing (Front) 234-4535 20 I-7
Motor Gp. - Swing (Rear) 234-4537 21 I-8
Valve Gp. - Swing Control 241-8929 22 G-9
Pump Gp. - Swing 242-6923 23 B-8
Valve Gp. - Main Control 237-9147 24 F-6
Filter Gp. - Return 259-0681 25 A-14
Component Locations
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
FLUID POWER SYMBOLS
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 ACTING
SINGLE 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
AB
PT
AB
PT
SHIFTED POSITION
INFINITE POSITION
CONTROL VALVES
ATTACHMENT
MANUAL SHUTOFF
SHUTTLE PILOT
CONTROLLED
Hydraulic Symbols (Electrical)
Electrical Symbols Table
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
T
Pressure
Symbol
Temperature
Symbol
Level
Symbol
Flow
Symbol
Electrical Symbols (Electrical)
Main pump compartment - Pilot filter (11) and Case drain filter (1) for the front, rear, and swing pumps.
Left side wall of hydraulic tank. Case drain filter (1) for travel motors, swing motors, and other components.
Pilot oil manifold - Solenoid valve (hydraulic activation) (3).
The return accumulator (16) is located below the case drain filters.Pilot accumulator (8).
Left travel motor (14) and Travel brake valve (4).
Pump compartment - Front pump (5A), Rear pump (5B), Pilot pump (6), Fan pump (9), and
Swing pump (23).
Main conrol valve - Boom side (24A) and Stick side (24B).
3
11 19 25
1
2
20
8
4
4
14
14
2396
5
17
4
14
7
16
7
10
15
12
13 2418
21
22
RENR7376-00
20 Page, Color 2, REM
HYDRAULIC CIRCUIT COLOR DESCRIPTIONS
Pump Output (Main, Front and Rear)
Pump Output (Fan)
Supply Line
Drain / Return Line
Stick Circuit
Bucket Circuit
Pump Output (Pilot)
Boom Circuit
Front Shovel Circuit
Pump Output (Swing)
LINE PATTERNS
Drain / Return Lines
Component Group
Pilot / Load Sensing Pressure
Pressure Line
Attachment
Travel Circuits
I
15 14 13 12 11 987654
G
H
I
321
A
B
C
D
E
F
43211098765
A
B
C
15 13 12 1114
D
E
F
G
H
10
STICK CYLINDER
BUCKET CYLINDER
BOOM CYLINDER
TRAVEL MOTOR (LEFT)TRAVEL MOTOR (RIGHT)
SWING MOTOR (REAR) SWING MOTOR (FRONT)
MASTER CYLINDER BOTTOM DUMP
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
SDRDR1S
A
MG
PS1
a1 P1 P2 a2
PSg
LS2
D2B1D1
LS1
AR3
BR3
AL4
BL4
BL3
AL3
PF
PR
BL1
AL1 AR1
BR1
BL3 AL3 AR3
BR3
PF
PR
AL4
BL4 BR1 AR1 BL1 AL1
L2
L3
DR
DR1
A
B
DR
DR1
L2
L3
B
A
BL2
AL2
BL2 AL2
FWD
FWD
IN
REV
REV
OUT
STICK
TRAVEL(L)
TRAVEL(R)
CLOSE
UP
OPEN
DOWN
BOOM
BUCKET
BOTTOM DUMP
LS
bL1bR1aL4
aL1aR1bL4
DR4DR5
R2
DR3
PS3
DR1
aR3aL3aL2
bR3bL3bL2
R1
DR2
PS2
DR4PS4
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
P
PG
B
A
Pi
Dr
Dr
BG
B
A
AG
Pi
PG
A
B
P
THIS SCHEMAT IC IS FOR THE 385C FRONT SHOVEL
EXCAVATOR.
PART # 232-4127 CHG 01, HPC OFF, TRUE LOAD SIGNAL AND
PART # N/A, HPC ON, DUPLICATED LOAD SIGNAL.
Components are shown installed on a fully operable machine with the key and
engine off and transmission shifter in neutral.
12
23
9
17
6
5
10
18
1
25
11
19
13
7
3
4
8
2
4
14
21
22
20
24
17
(Alternate Connection for HPC-ON, Duplicated Load Signal)
Part# 232-4127 CHG 01, HPC-OFF, True Load Signal
PF
PR
LS
DR1
PS1
a1
P1
P2
a2
PSg
LS2
LS1
PF
PR
17
D2B1D1
14
15
16
5
