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 TM
9-2350-238-20-2
F-3.
HYDRAULIC POWER SUBSYSTEM.
valve (9) keeps the pressure in the supply
Functional
Description.
lines to the level wind solenoid valves at
135 psi (931 kPa). During level wind
a.
Hydraulic reservoir (19) is filled with
traversing, the relief valve (9) is energized
hydraulic
fluid.
by the tow winch cable sensing switches.
When energized, the relief valve (9) in-
b. When engine (13) is running and
creases pressure to 1750 psi (12,066 kPa)
magnetic clutch (15) is energized, hydraulic
to drive the cab traversing hydraulic motor.
fluid from hydraulic reservoir (19) is drawn
through filter (21) and slip ring (1) by
The handpump (10) provides
hydraulic pumps (16, 17, and 18).
g.
hydraulic fluid pressure for emergency
manual release of the boom winch, tow
c. T h e h y d r a u l i c p u m p ( 1 6 ) s u p p l i e s
winch,
and
traversing
motor
brakes
and
for
hydraulic fluid at 40 gallons per minute
emergency
manual
raising
of
the
spade.
(152 liters per minute) through the flow
divider manifold for distribution to the
boom winch subsystem.
d. The
hydraulic
pump
(17)
supplies
hydraulic fluid at 40 gallons per minute
(152 liters per minute) to the flow divider
valve (3), which distributes the fluid flow
between the traversing subsystem and the
boom cylinder subsystem. When the tra-
versing subsystem is not being used, un-
used fluid is directed back to the flow
divider manifold for use by the boom cylin-
der
subsystem
as
needed.
The relief valve (7) has two pressure
e.
settings. Only the high pressure setting can
be externally adjusted by the pressure ad-
justment setscrew. The valve is normally in
the low pressure setting position, shifting
to the high pressure setting when the
solenoid is energized by the closing of one
of the tow winch level wind switches.
f. T h e
hydraulic
pump
(18)
pumps
hydraulic fluid at 8 gallons per minute (30
liters per minute) through the filter (12) and
relief valves (8 and 9). The relief valve (8)
allows the hydraulic pressure to build up to
1850 psi (12,756 kPa) for operation of the
impact wrench, spade, and suspension
lockout cylinders. The relief valve (9) is a
solenoid operated dual setting type
relief
valve. Normally, the relief valve is
deenergized.
When
deenergized,
the
relief
F-4
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