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Page Title:
BOOM CYLINDER HYDRAULIC SUBSYSTEM. |
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 TM 9-2350-238-20-1
F-15. BOOM CYLINDER HYDRAULIC SUBSYSTEM.
functional
Description.
The hydraulic fluid power for the
Moving the handle of the directional
a.
d.
control valve ( 1 ) in the LOWER position
operation of the boom cylinders is supplied
directs hydraulic fluid to the retract ports of
by the hydraulic power subsystem.
the boom cylinders (4), which lowers the
The boom cylinder hydraulic sub-
boom. The relief valve (6) protects the sub-
b.
system controls the power to raise and
system from overpressure. Hydraulic
pressure passing through the flow control
lower the b o o m .
valve (2) causes the relief valve (5) to open
Moving the handle of the directional
and allow return flow to the reservoir.
c.
control valve ( 1 ) in the RAISE position
When the handle of the directional
directs hydraulic fluid through the bypass
e.
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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