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)
RENR7019-00
20 Page
RENR7019
September 2005
385C Material Handler
Hydraulic System
WAW1-UP
©
2005 Caterpillar
All Rights Reserved
Printed in U.S.A.
VALVE GP - MAINFOLD & REDUCING VALVEGP-SWING
MOTOR GP - PISTON (TRAVEL)
VALVE GP - MAIN CONTROL
FILTER GP
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 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) 266-7953
Sensor As - Pressure (1-Pump/2-Pump, 1-Way) 221-8859
Swivel Gp 156-0622
Valve Gp - Check (Double) 233-7881
Valve Gp - Check (Hdyraulic Fan Motor, Radiator) 173-3429
Valve Gp - Check (Return) 201-9381
201-9382
Valve Gp - Control (Stick Lowering) 195-6852
195-6853
Valve Gp - Control (Swing) 241-8929
Valve Gp - Main Control 251-2160
Valve Gp - Manifold & Reducing (Pilot Oil) 140-0736
Valve Gp - Manual (1-Pump/2-Pump, Shutoff) 173-7992
Valve Gp - Relief (Line) 160-8734
Valve Gp - Solenoid (Boom Load Control) 171-0028
Valve Gp - Swing Cushion 116-3420
Valve Gp - Travel Counterbalance 155-9200
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
B-10
C-9
B-9
B-9
B-7, B-9
B-8
B-8
B-8
I-6, I-8
I-4
I-5
A-7
A-5
B-4
A-3
B-3, C-6
G-6
G-11
C-8
B-8
B-8
I-11
I-12
G-5
F-4
B-10
C-2
E-11
G-12
H-4
G-7, G-8
Component Locations
261
411242
931
319
16 19712
931 1762528
17
719
25
11 248
26181
53
10 30
10 30
28
18 2919
12 16
13 14 15 16
8
29
8
9
2
4
1
7
1
1
3
1
2
5
2
6
1
2
4
1
1
2
5
8
4
6
RENR7019-00
20 Page, Color 2
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
THIS SCHEMATIC IS FOR THE 385C MATERIAL HANDLER
Part #: 264-4723
Components are shown installed on a fully operable machine with the key and engine
off and transmission shifter in neutral.
DRAIN / RETURN LINE
LINES GROUP COLOR DESCRIPTIONS
MAIN PUMP OUTPUT (FRONT AND REAR)
SWING PUMP OUTPUT
LEFT TRAVEL CIRCUIT
PILOT PUMP OUTPUT
RIGHT TRAVEL CIRCUIT
SUPPLY LINE
BUCKET CONTROL CIRCUIT
GRAPPLE CYLINDER CIRCUIT
FAN PUMP OUTPUT
BOOM CYLINDER CIRCUIT
STICK CYLINDER CIRCUIT
A
B
C
D
E
F
G
H
I
123456789101112
123456789101112
A
B
C
D
E
F
G
H
I
BOOM
PIN
TOUT
DR1
DR2
DR3
DR6
DR5
DR4
R
M
PR
PG
E
F
SWING
DD
F
E
P
T
M2
M1
C/V
Dr1
CYL
Pi1
T
T
Pi1
CYL
Dr1
C/V
B
FRONT
REAR
A
STICK CYLINDERS
M
PD
B
L1
L
S
PR
A
Dr
B
Dr
Pi
Pi
Pa
Pb
Pa
Dr
N
Pi
Pi
Dr
PR
LEFT
TRACK
aL4
bR1
bL1
R2
TRAVEL
(L)
TRAVEL
(R)
L2
L1
Qmax Qmin
FWD
M1
T2T1
R
S
G
aL1
BL1
AL1
LS2
FWD
aR1
bL4
D1
AL4
BR1
AR1
BL4
PF
PS1
STICK
LS1
SA1
P2
P1
P1
P2
B1
SA2
IN
REVREVOUT
RIGHT
P1
P2
Dr
BL2
AL2
aR3
aL3
bR3
bL3
ATT
AR3
BR3
bL2
PR
aL2
R1
BUCKET
DOWN
OPEN
UP
CLOSE
A
BB
A
PSA3
PSA2
PSA1
PG
Pi5
PAC
Pi3
Pi2
Pi1
Pi4
Pi6
PSA4
PSg
a2a1
BOOM CYLINDERS
AL3
BL3
B
A
LS
LS
pA
M
E
D
I
U
M
P
R
E
S
S
U
R
E
V
A
L
V
E
G
P
pB
LS
M
BA
P
A2
TT
A1
P
P
T
Pp
X
T
Dr
C
A
A
C
Dr
T
Pp
GRAPPLE
CYLINDERS
SENSOR AS
PRESSURE
221-8859
PUMP GP
PISTON
(MAIN)
155-9205
PUMP GP
GEAR
(PILOT)
155-9222
PUMP GP
PISTON
(SWING)
266-7953
VALVE GP
MANUAL
173-7992
M
PUMP GP
PISTON
(FAN MOTOR)
170-9918
VALVE GP
MANIFOLD & REDUCING
(PILOT)
140-0736
VALVE GP
RELIEF (LINE)
160-8734
ACCUMULATOR
& MTG GP
HYDRAULIC (PILOT)
160-4138
ACCUMULATOR GP
HYDRAULIC
215-4905
FILTER GP
185-0336
FILTER GP
259-0681
FILTER GP
6E-5534
FILTER GP
6E-5534
FILTER GP
234-4454
MOTOR GP
PISTON
247-8978
VALVE GP
CHECK
173-3429
MOTOR GP
PISTON
(HYRAULIC OIL
COOLER)
225-4614
VALVE GP
CHECK (RETURN)
201-9381
VALVE GP
CHECK (RETURN)
201-9382
D2
A
M
Pb
B
A
N
X
SENSOR AS
PRESSURE
221-8859
MOTOR GP
SWING (FRONT)
234-4535
MOTOR GP
SWING (REAR)
234-4537
MOTOR GP
PISTON (TRAVEL)
209-5895
SWIVEL GP
156-0622
VALVE GP
CONTROL (SWING)
241-8929
VALVE GP
MAIN CONTROL
251-2160
VALVE GP
SWING CUSHION
116-3420
MOTOR GP
PISTON (TRAVEL)
209-5895
VALVE GP
TRAVEL
COUNTERBALANCE
155-9200
VALVE GP
CONTROL
(STICK LOWERING)
195-6852
VALVE GP
CONTROL
(STICK LOWERING)
195-6853
VALVE GP
SOLENOID
(BOOM LOAD
CONTROL)
171-0028
VALVE GP
CHECK
(DOUBLE)
233-7881
