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BOOM WINCH HYDRAULIC SUBSYSTEM MANUAL RELEASE. (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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TRAVERSING HYDRAULIC SUBSYSTEM. (Cont) - TM-9-2350-238-20-20438
TM
9-2350-238-20-2
F-9.
TRAVERSING
HYDRAULIC
SUBSYSTEM.
Functional
Description.
direction
through
the
hydraulic
motor
(9),
a. The
hydraulic
fluid
power
for
the
which traverses the cab to the right.
operation
of
the
traversing
subsystem
is
supplied by the hydraulic power subsystem.
e. When
directional
control
valve
(2)
is
in
neutral
position,
hydraulic
fluid
flows
b. T h e  t r a v e r s i n g  h y d r a u l i c  s u b s y s t e m
through
the
open
center
port
to
the
flow
controls  the  power  for  rotational  movement
divider  manifold
in
the
hydraulic
power
of the cab.
subsystem.
Depressing the forward portion of the
c.
f. W h e n  t h e  e n g i n e  i s  n o t  o p e r a t i n g  o r
foot  pedal  of  the  directional  control  valve
during  hydraulic  power  failure,  the  travers-
(2), directs hydraulic fluid at 2050 psi
ing brake (7) can be manually released by
(14,135  kPa)  through  the  solenoid  valve  (4)
setting the brake release valve (6) to HAND
to the brake release valve (6), releasing the
PUMP  PRESSURE  and  operating  the  hand
brake (7), and to the hydraulic motor (9),
pump, so that the cab can be rotated.
which traverses the cab to the left. The
return  flow  from  the  hydraulic  motor  (9)
During  tow  winch  operation,  cab
passes through the solenoid valve (3) and
g.
traversing  is  controlled  automatically  by
an
the directional control valve (2) and back to
electrical  sensing  system.  The  sensing
the
reservoir.
system
energizes
either
the
solenoid
valve
d. Depressing  the  rear  portion  of  the
(3) for right traversing, or the solenoid
valve (4) for left traversing. Hydraulic
foot  pedal  of  the  directional  control  valve
pressure at 1750 psi (12,066 kPa) is sup-
(2) has the same effect as when traversing
plied by the 8 gpm pump in the hydraulic
Ieft,  described  above,  except  that  the
hydraulic fluid is routed in the opposite
power
subsystem.
F-18

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