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B1700·B2100·B2400
WSM,11772
[4] POSITION CONTROL VALVE
8 HYDRAULie SYSTEM
This
position
control
valve
is
located
under
the
hydraulic
cylinder block.
III Neutral
Oil forced
into
the
control
valve
through
the
P
port
pushes open
the
unload
poppet
(5)
and
then
returns
to
the
transmission
case
through
the
T1
port.
Oil behind
the
unload
poppet
(5)
returns
to
the
transmission
case
through
the
spool (4) and
the
T3
port.
Since
the
poppet
2 (1) and
poppet
1 (2) are closed,
oil
in
the
hydraulic
cylinder
does
not
flow
to
the
transmission
case.
Thus,
the
implement
remains
at
its
fixed position.
P:
Pump
Port
Tl,
T2,
T3:
Tank
Port
c:
Cylinder
Port
(1)
Poppet
2
(4)
Spool
(2)
Poppet
1
(5)
Unload
Poppet
(3)
Plunger
B193F805
-
III
Lift
When
the
control
lever
is
set
to
the
LIFT
position,
the
spool (4)
is
move
to
the
right.
The oil forced
into
the
control
valve
through
the
P
port
flows
to
the
back
of
the
unload
poppet
(5)
to
close it.
The oil pushes open
the
poppet
1 (2), and
flows
into
the
hydraulic cylinder
through
the
C
port
to
lift
the
implement.
P:
Pump
Port
Tl,
T2,
T3:
Tank
Port
c:
Cylinder
Port
(1)
Poppet
2 (4)
Spool
(2)
Poppet
1 (5)
Unload
Poppet
(3)
Plunger
B193F806
III
Down
When
the
control
lever
is
moved
to
DOWN
position,
the
spool (5)
is
move
to
the
left,
and
the
poppet
2 (2)
is
also move
to
the
left
by
the
lever (1).
Oil in
the
hydraulic cylinder
is
forced
out
to
the
transmission
case
through
the
T2
port
by
the
weight
of
the
implement,
causing
the
implement
to
lower.
Oil forced
into
the
control
valve
through
the
P
port
pushes open
the
unload
poppet
(6) and returns
to
the
transmission
case
through
the
T1
port.
B193F807
P:
Pump
Port
c:
Cylinder
Port
(1) Lever
(2)
Poppet
2
(3)
Poppet
1
E8-M4
Tl,
T2,
T3:
Tank
Port
(4)
Plunger
(5) Spool
(6).
Unload
Poppet
220


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