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HYDRAULIC POWER SUBSYSTEM HAND PUMP OPERATING. (cont)
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TM-9-2350-238-20-2 Crane (CAB) Components Recovery Vehicle Full-Tracked: Light Armored M578 (
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BOOM WINCH HYDRAULIC SUBSYSTEM. (Cont) - TM-9-2350-238-20-20430
TM
9-2350-238-20-2
F-5.
BOOM
WINCH
HYDRAULIC
SUBSYSTEM.
Functional
Description.
a. The
hydraulic
fluid
power
for
the
d. Moving  the  handle  of  the  directional
operation
of
the
boom
winch
is
supplied
by
control valve (1) in the PAY OUT position
has the same effect as in PAY IN except
the
hydraulic
power
subsystem.
that the hydraulic fluid is routed in the op-
posite direction through the hydraulic motor
b. T h e
boom
winch
hydraulic
subsystem
(9). The relief valve (5) controls the rate of
controls the power for boom winch opera-
flow in the return line and prevents free fall
tion when lifting or lowering a load.
of the load.
e. When  the  handle  of  the  directional
c. Move  the  handle  of  the  directional
control valve (1) in the PAY IN position to
control valve (1) is in the neutral position,
direct hydraulic fluid to release brake (7)
hydraulic fluid flows through the open
center port to the tow winch directional
and operate the hydraulic motor (9) to
retrieve  the  boom  winch  wire  rope.  Return
control valve.
fluid  from  the  hydraulic  motor  (9)  flows
through the pressure relief valve (5) and
f. W h e n
the
engine
is
not
operating
or
the directional control valve (1), then to the
during hydraulic power failure, the boom
reservoir. The relief valve (4) limits
winch  brake  can  be  manually  released  by
hydraulic pressure when paying in to 1425
setting the brake release valve (7) to HAND
psi  (9825  kPa)  to  protect  the  winch  com-
PUMP  PRESSURE  and  operating  the  hand
ponents
from
overload.
pump to lower a load.
F-10

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