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ARMY TM 9-2815-256-24 AIR FORCE TO 38G1-96-2 MARINE CORPS TM 2815-24/5 3-27.4.3  Hydraulic Head. Warning Compressed  air  used  for  cleaning  can  create  airborne  particles  that  may  enter  the  eyes  and  cause serious injury.  Pressure will not exceed 30 psig (207 kPa).  Eye protection required. NOTE Five vent wire screw assembly (52, FIGURE 3-54) sizes are available.  If specific oil return flow is not obtained during test, replace screw with appropriate size. Check vent wire screw assembly (52) for freedom of movement.  Flush head and blow out all passages with clean, dry air.  If vent wire is stuck, replace screw assembly with screw of same part number. 327.4.4  Rotor. CAUTION Do not touch machine finished surfaces.  Damage due to corrosion could occur. NOTE If damage or excessive wear is apparent, head and rotor must be replaced as a matched set.  Final check  for  excessive  wear  on  rotor  should  be  performed  on  test  stand  by  checking  for  minimum cranking delivery. Examine  radii  contacted  by  leaf  spring  and  tang  slot  for  excessive  wear.    Check  all  slots  and  charging  and discharge ports for chipping of edges or dirt, and rotor shank for major scratches.  Slight erosion on edge of discharge port is considered normal. 3-27.4.5  Delivery Valve. Inspect delivery valve retraction cuff for chipping or erosion of edges. CAUTION Do not force plungers into their bore and do not handle precision parts of rotor. 3-27.4.6  Plungers. While holding rotor under clean oil, insert plungers into their bores facing same direction as they were removed. With  thumb  and  forefinger  over  shoe  slots,  tilt  rotor  from  side  to  side  several  times  to  determine  complete freedom of movement.  If new plungers are being installed, interchanging their positions may be necessary as rotor  and  plungers  become  matched  parts.    If  plungers  are  sticking,  but  not  visibly  damaged,  clean  both plungers and bore with a soft brush and solvent such as lacquer thinner or acetone. 3-104


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