TM 5-3810-306-20NOTERear outriggers may be used to raisecrane in order to lower boom noseslightly below horizontal.a. If air in telescope cylinder is not readily removed,lower boom to below horizontal, extendtelescope cylinder as far as practicable, andallow boom to remain in this position overnight.WARNINGExtreme care must be used whenremoving any plugs or restrictionsfrom a hydraulic system suspected tohave entrapped air that may bepressurized.NOTEThis should allow entrapped air tofind its way to holding valve sotelescoping boom IN next morningshould force air back to reservoir.NOTEWhile allowing boom to remain inextended and lowered positionovernight is helpful in removingentrapped air from hydraulic cylinder,ensure boom is first telescoped IN(not OUT) in morning. TelescopingOUT can cause air to be forced backinto cylinder.b. Entrapped air can be removed from any cylinderby cycling cylinder. On certain cylinders, aplugged port is provided on rod end to bleed-offentrapped air.WARNINGDo not attempt to loosen fittings inpressurized lines or while hydraulicpumps are in operation.c. If pumps and motors are noisy after bleedingcylinders, bleed air by loosening various fittings.END OF TASK16-53
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