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TM 5-3810-306-20 BLEEDING AIR FROM HYDRAULIC SYSTEM TOOLS: None SUPPLIES: None EQUIPMENT CONDITIONS: None GENERAL: By  design,  air  entering  the  hydraulic  oil will  normally  be  removed  automatically by passage of the oil over the baffles in the  hydraulic  reservoir.      However,  air can enter the system if a component has been replaced, the reservoir level is too low,  or  a  leak  develops  in  the  suction lines to the pumps. If air becomes entrapped in the hydraulic oil,  it  may  be  detectable  in  pumps  and motor-operated components such as the swing  mechanism  and  hoist(s)  causing these    units    to    become    noisy    during operation.          Should     noisy     operation occur,  first  check  oil  level  in  hydraulic reservoir   and   fill   as   necessary.   Then inspect for leaks in suction lines leading to pumps. Small  leaks  may  be  difficult  to  locate. Should you encounter a leak that is not readily  detectable,  the  following  method may  be  used  when  checking  for  such leaks. 1. PRESSURIZE HYDRAULIC SYSTEM. a.   Seal    all    normal    openings    (vents,    etc.)    in hydraulic system and reservoir. b.   Using a positive means to control pressure (i.e., a regulator), pressurize hydraulic system to 2 to 4 psi (13.79 to 27.6 kPa/0.1379 to 0.276 bar). NOTE A soap solution applied to the fittings and  joints  may  also  prove  helpful  in detecting small leaks while the system is pressurized. c.   Inspect   all   joints   and   fittings   for   evidence   of leaks. d.   Remove  pressure,  repair  any  leaks  found  and reopen   any   openings   (vents,   etc.)   closed   for inspection. e.   Refill  reservoir  after  completing  any  repairs  or service. f. Operate   all   hydraulic   circuits   several   times   in both  directions.    This  action  should  return  any entrapped  air  to  the  reservoir  where  it  can  be removed from oil by the baffle system provided. 2. REMOVE ENTRAPPED AIR IN CYLINDERS. CAUTION Locate   crane   on   a   firm   supporting surface   and   position   boom   in   most stable position when extending boom at low angles. 16-52

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