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Page Title:
BOOM CYLINDER HYDRAULIC SUBSYSTEM. |
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 TM
9-2350-238-20-2
F-15. BOOM CYLINDER HYDRAULIC SUBSYSTEM.
Functional Description.
a. The hydraulic fluid power for the
d. Moving the handle of the directional
operation of the boom cylinders is supplied
control valve (1) in the LOWER position
by the hydraulic power subsystem.
directs hydraulic fluid to the retract ports of
the boom cylinders (4), which lowers the
b. The boom
cylinder hydraulic sub-
boom. The relief valve (6) protects the sub-
system controls
the power to raise and
system
from
overpressure.
Hydraulic
lower
the
boom.
pressure
passing
through
the
flow
control
valve (2) causes the relief valve (5) to open
Moving the handle of the directional
c.
and allow return flow to the reservoir.
control valve (1) in the RAISE position
directs
hydraulic
fluid
through
the
bypass
e. When
the
handle
of
the
directional
check valve of the relief valve (5) to the
control valve (1) is in the neutral position,
extend ports of the boom cylinders (4),
hydraulic fluid is blocked, hydraulically lock-
which raises the boom. The relief valve (6)
ing the boom cylinders in a fixed position.
The emergency release valve (7) can be
releases excess hydraulic fluid
pressure
over
2150
psi
(14,824
kPa)
to
return
to
opened to lower the boom.
the reservoir.
F-30
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