©
2005 Caterpillar
All Rights Reserved
Printed in U.S.A.
RENR7227
April 2005
385C Excavator
One Way Flow
EDA1-UP
KGB1-UP
KBC1-UP
SBE1-UP
T2E1-UP
KKK1-UP
JCM1-UP
MNZ1-UP
Hydraulic System (Attachment)
Schematic
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
PEDAL
GENERAL 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 M ANUAL
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
MAIN CONTROL VALVE
RIGHT SIDE VIEW
UPPER
FRAME
SWING
DRIVE
2
1
LS
A
DETAIL A
(Alternate Connection for Duplicate Load Signal)
225-4838
LS
1
3
2
This Attachment Schematic is intended to
be used in conjunction with the Standard
Hydraulic Schematic in this Service Manual.
Hydraulic Schematic
"230-2721"
PILOT LINE
DRAIN LINE
MAIN CONNECTOR LINE
5
5
View A-A
©
2005 Caterpillar
All Rights Reserved
Printed in U.S.A.
R E N R 7223
April 2005
385C Excavators
Com bined Function
EDA1-UP
KGB1-UP
KBC1-UP
SBE1-UP
T2E1-UP
KKK1-UP
JC M 1-UP
MNZ1-UP
H ydraulic System (A ttachm ent)
ONE POSITION
TW O POSITION
THREE POSITION
VENTED PRESSURIZED
RETURN ABOVE FLUID LEVEL
RETURN BELOW FLUID LEVEL
LINES CRO SSING
LINES JO INING
TW O -WAY
THREE-WAY
FOUR-WAY
SPRING
CONTROL VALVES
RESTRICTION
LINE RESTRICTION
(FIXED)
2-SECTION PUM P
MAIN
AUX.
SPRING
(ADJUSTABLE)
VARIABILITY
LINE RESTRICTION
(VARIABLE)
LINE RESTRICTION
(VARIABLE and PRESSURE CO M PENSATED)
PRESSURE
COM PENSATION
PUM P: VARIABLE and
PRESSURE CO M PENSATED
ENERG Y TR IANG LES
HYDRAULIC PNEUMATIC
MEASUREMENT
PRESSURE
TEM PERATURE
FLO W
RO TATING SH A FTS
UNIDIRECTIO NAL BIDIRECTIONAL
PUSH-PU LL LEVER
PEDAL
GENERAL MANUAL
PUSH BUTTO N
SPRING
MANUAL CONTROL SYM BOLS
HYDRAULIC MOTORS
FIXED
DISPLACEM ENT
VARIABLE DISPLACEM ENT
NON-COM PENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
HYDRAULIC PUM PS
FLUID STORAG E RESERVO IRS
CROSSING AND JO INING LINES
VALVE ENVELO PES
VALVE PORTS
BASIC COM PONENT SYM BO LS
FLUID CONDITIONER
PUM P or MOTOR
FLUID PO W ER SYM BO LS
FIXED
DISPLACEM ENT
VARIABLE DISPLACEM ENT
NON-COM PENSATED
UNIDIRECTIONAL
BIDIRECTIONAL
VALVES
PILO T CONTROL SYM BOLS
RELEASED PRESSURE
EXTERNAL RETURN
INTERNAL RETURN
REMOTE SUPPLY PRESSURE
SIMPLIFIED
COMPLETE
INTERNAL
SUPPLY PRESSURE
ACCUMULATORS
SPRING LO ADED
GAS CHARGED
SOLENO ID
or MANUAL
SOLENO ID
and PILO T
SOLENO ID and
PILO T or M ANUAL
COM BINATION CONTROLS
SOLENO ID
SERVO
THER M AL
DETENT
HYDRAULIC AND PNEUM ATIC CYLINDERS
DOUBLE ACTING
SINGLE ACTING
BASIC SYM BO L
SPRING LO ADED
CHECK VALVES
TW O
POSITION
INFINITE
POSITIONING
FLOW IN ONE
DIRECTION
FLOW ALLO W ED IN
EITH ER DIRECTION
THR EE
POSITION
CROSS
FLOW
PARALLEL
FLOW
INTERNAL PASSAG EW AYS
NORMAL PO SITION
AB
PT
AB
PT
SHIFTED PO SITION
INFINITE PO SITION
CONTROL VALVES
385C :
Schem atic
Closed Position Two Way Flow
View A-A
1
2
5
Front View
Open Position One Way Flow
