LA271 • LA301 • LA351 • LA401 •
LA272'
LA302 •
LA352'
LA402 WSM, 17021 MECHANISM
(3) LA401 • LA272 • LA302 • LA352 • LA402
(3
Position Bucket Control)
81:
81 Port
82:
82
Port
P8:
P8
Port
T
(3) Bucket Control Section
The bucket control valve is of 3-position,
6-
connection, no detent, spring center type, consisting
of a mono block valve housing, spool, load check
valve, etc. This valve has A2 and B2 ports and
controls oil flow to the bucket cylinder.
(4) Power Beyond
This section has
PB
port which
is
connected to the
power beyond port
of
hydraulic block by the hydraulic
hose, and feeds oil to the three point hydraulic control
valve.
A1
:
A1
Port
A2:
A2 Port
® @
A1
~--------'
B1
9--E-------'
A2
!--------======tli-'-'-'f
B2
<>-----------'
L-I.--------1PB
3
2
17000F00151
(1)
Inlet and Outlet Section
P:
P Port
(2)
Boom Control Valve
T:
T Port
(3)
Bucket Control Valve
(4)
Power Beyond
(5)
Relief Valve
The control valve assembly
is
composed
of
one
casting block and four major section
as
shown above.
And the relief valve
is
installed
on
this valve.
(1) Inlet and Outlet Section
This section has P and T ports.
The P port
is
connected to the pump port of hydraulic
block by the hydraulic hose.
The T port
is
connected to the return port of
transmission case by the hydraulic hose.
(2) Boom Control Section
The boom control valve
is
of
4-position, 6-connection,
detent, spring center type, consisting
of
a mono block
valve housing, spool, load check valve, etc. This
valve has
A1
and
B1
ports and controls oil flow to the
boom cylinder.
17020MOO
190
M-19
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