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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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