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Page Title:
BOOM WINCH HYDRAULIC SUBSYSTEM. |
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 TM 9-2350-238-20-1
F-5. BOOM WINCH HYDRAULIC SUBSYSTEM.
Functional Description.
Moving the handle of the directional
The hydraulic fluid power for the
d.
a.
control valve ( 1 ) in the PAY OUT position
operation of the boom winch is supplied by
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
The boom winch hydraulic subsystem
b.
(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.
When the
handle of the directional
Move the handle of the directional
e.
c.
control valve (
1 ) is in the neutral position,
control valve (1 ) in the PAY IN position to
direct hydraulic fluid to release brake (7)
hydraulic fluid
flows through the open
and operate the hydraulic motor (9) to
center port to
the tow winch directional
retrieve the boom winch wire rope. Return
control valve.
fluid from the hydraulic motor (9) flows
through the pressure relief valve (5) and
When the engine is not operating or
f.
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
PUMP PRESSURE and operating the hand
psi (9825 kPa) to protect the winch com -
pump to lower a load.
ponents from overload.
F-10
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