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BOOM CYLINDER HYDRAULIC SUBSYSTEM MANUAL LOWERING. (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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TOW WINCH HYDRAULIC SUBSYSTEM. (Cont) - TM-9-2350-238-20-20458
TM
9-2350-238-20-2
F-19.
TOW WINCH HYDRAULIC SUBSYSTEM.
Functional
Description.
d. Moving  the  handle  of  the  directional
a. The
hydraulic
fluid
power
for
the
control valve (1) in PAY OUT position has
operation
of
the
tow
winch
is
supplied
by
the same effect as in PAY IN except that
the
hydraulic
power
subsystem.
the hydraulic fluid is routed in the opposite
direction  through  the  hydraulic  motor  (8).
b. T h e  t o w  w i n c h  h y d r a u l i c  s u b s y s t e m
The relief valve (10) controls the rate of
controls the power for tow winch operation
flow in the return line.
when pulling or releasing a load.
e. When  the  handle  of  the  directional
Moving  the  handle  of  the  directional
c.
control valve (1) is in the neutral position,
control valve (1) in the PAY IN position
hydraulic fluid from both 40 gpm hydraulic
directs hydraulic fluid to release brake (7)
pumps flows through the open center port
and  operate  the  hydraulic  motor  (8)  to
to the reservoir.
retrieve the tow winch wire rope. Return
fluid  from  the  hydraulic  motor  (8)  flows
f. I f t h e b o o m w i n c h i s u s e d a t t h e
through the pressure relief valve (10) and
same  time  that  the  tow  winch  is  being
the directional control valve (1), then to the
used, the tow winch operation will be
reservoir. The relief valve (4) limits hydrau-
slowed
down
in
to
boom
winch
lic pressure when paying in to 2150 psi
use.
(14,824  kPa)  to
protect
winch
components
from  overload.
F-38

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