©
2003 Caterpillar
All Rights Reserved
Printed in U.S.A.
This attachment schematic is to be used in conjunction with the Standard Schematic in
this Service Manual.
RENR5415-02
February 2003
385B Excavators
Boom Lowering Control Valve
MYA1-UP
RCD1-UP
BKF1-UP
FDL1-UP
ANS1-UP
CLS1-UP
BLY1-UP
Hydraulic System - Attachment
RIGHT
C
PRPB
E
F
SWING
PR
A
Dr
B
Dr
Pi
Pi
Pa
Pb
L2
D
L1
Qmax Qmin
LEFT
D
F
E
P2
TRACK
BL2
AL2
PSA3
PSA2
PSA1
PG
PIN
TOUT
DR1
DR2
DR3
Pi5
PAC
Pi3
Pi2
Pi1
Pi4
Pi6
M1
T2T1
R
S
A
PSA4
DR6
M
G
aL3
bL3
D1
D2
AL4
BR1
R2
ATT
AR1
BL1
AL1
AR3AL3
PSga2a1
DR5
BL4
A
B
bL2
PF
PR
LS2
B
L1
PS1
B
A
L
R1
STICK
BUCKET
S
BOOM
TRAVEL
(L)
TRAVEL
(R)
DR4
REV
FWD FWD
REV
aL1
aR1
bL4
aL4
bR1
bL1
LS1
SA1
P2
Pb
Pa
Pi
Pi
Dr
P1
1
aR3
aL3
)(
bR3
bL3
C
BR3
BL3
FRONT
P
T
B
M2
Dr
A
OUT
P1
P2
M1
Dr
aL2
REAR
UP
B
CLOSE
PR
B1
DOWN
IN
A
NN
SA2
OPEN
MAIN CONNECTOR LINE
PILOT LINE
DRAIN LINE
This Attachment Schematic is intended to
be used in conjunction with the Standard
Hydraulic Schematic in this Service Manual.
Hydraulic Schematic
177-2637
P
3
1
2
P
P
3
2
1
Item
Component
STANDARD COMPONENTS
No.
1
2
3
Boom Lowering Control Valve
Boom Lowering Control Valve
Solenoid Valve
f05386
