TM 5-3810-306-34
NOTE
NOTE
Rear outriggers may be used to raise
While allowing boom to remain in
crane in order to lower boom nose
extended and lowered position
slightly below horizontal.
overnight is helpful in removing
entrapped air from hydraulic cylinder,
a. If air in telescope cylinder is not readily removed,
ensure boom is first telescoped IN
lower boom to below horizontal, extend
(not OUT) in morning. Telescoping
telescope cylinder as far as practicable, and
OUT can cause air to be forced back
allow boom to remain in this position overnight.
into cylinder.
WARNING
b. Entrapped air can be removed from any cylinder
by cycling cylinder. On certain cylinders, a
Extreme care must be used when
plugged port is provided on rod end to bleed-off
removing any plugs or restrictions
entrapped air.
from a hydraulic system suspected to
have entrapped air that may be
WARNING
pressurized.
Do not attempt to loosen fittings in
NOTE
pressurized lines or while hydraulic
pumps are in operation.
This should allow entrapped air to
find its way to holding valve so
c. If pumps and motors are noisy after bleeding
cylinders, bleed air by loosening various fittings.
telescoping boom IN next morning
should force air back to reservoir.
END OF TASK
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