RENR7268-01
March 2012
Boom Lowering Control Valve
385C Excavator
Hydraulic System (Attachment)
EDA1-UP
KGB1-UP
KBC1-UP
SBE1-UP
T2E1-UP
KKK1-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
RENR7268-01
16 Page, (Dimensions: 34 inches x 24 inches)
RENR7268-01
16 Page, B/W
1
3
3
2
4
4
6
5
LS
STICK CYLINDER
BUCKET CYLINDER
BOOM CYLINDER
TRAVEL MOTOR ( LEFT )TRAVEL MOTOR ( RIGHT )
SWING MOTOR ( REAR) SWING MOTOR ( FRONT)
C/V
Pi1
T
CYL
Dr 1
C/V
Pi1
T
CYL
Dr 1
X
X
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
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
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
FWD
FWD
IN
REV
REV
OUT
STICK
TRAVEL(L)
TRAVEL(R)
CLOSE
UP
OPEN
DOWN
BOOM
BUCKET
ATCH
LS
bL1bR1aL4
aL1aR1bL4
DR4
R2
DR3
PS3
DR1
aR3aL3aL2
bR3bL3bL2
R1
DR2
PS2
DR4PS4
BL2 AL2
Attachment Components
Item
No.
Description
1. Preportional Pressure Reducing Valve - Boom Lower
2. Load Control Valve - Boom Lowering
3. Line Relief Valve - Boom Cylinder Head End
4. Check Valve
5. Manual Purge Valve
6. Boom Cylinders
LS Load Sensing Signal
Hydraulic Schematic
239-8815
PILOT LINE
DRAIN LINE
MAIN CONNECTOR LINE
This Attachment Schematic is intended to
be used in conjunction with the Standard
Hydraulic Schematic in this Service Manual.
RENR7268-01
March 2012
Boom Lowering Control Valve
385C Excavator
Hydraulic System (Attachment)
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
RENR7268-01
16 Page, (Dimensions: 34 inches x 24 inches)
RENR7268-01
16 Page, B/W
1
3
3
2
4
4
6
5
LS
STICK CYLINDER
BUCKET CYLINDER
BOOM CYLINDER
TRAVEL MOTOR ( LEFT )TRAVEL MOTOR ( RIGHT )
SWING MOTOR ( REAR) SWING MOTOR ( FRONT)
C/V
Pi1
T
CYL
Dr 1
C/V
Pi1
T
CYL
Dr 1
X
X
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
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
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
FWD
FWD
IN
REV
REV
OUT
STICK
TRAVEL(L)
TRAVEL(R)
CLOSE
UP
OPEN
DOWN
BOOM
BUCKET
ATCH
LS
bL1bR1aL4
aL1aR1bL4
DR4
R2
DR3
PS3
DR1
aR3aL3aL2
bR3bL3bL2
R1
DR2
PS2
DR4PS4
BL2 AL2
Attachment Components
Item
No.
Description
1. Preportional Pressure Reducing Valve - Boom Lower
2. Load Control Valve - Boom Lowering
3. Line Relief Valve - Boom Cylinder Head End
4. Check Valve
5. Manual Purge Valve
6. Boom Cylinders
LS Load Sensing Signal
Hydraulic Schematic
239-8815
PILOT LINE
DRAIN LINE
MAIN CONNECTOR LINE
This Attachment Schematic is intended to
be used in conjunction with the Standard
Hydraulic Schematic in this Service Manual.
