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TM9-2815-202-34 b.   Cleaning WARNING c. Compressed  air  used  for  cleaning  purposes  will  not  exceed  30  psi.  Use only  with effective chip guarding and personal (goggles/shield,   gloves   etc). Wash  all  blower  parts  In  clean  fuel  oil  and  dry Inspection protective equipment with compressed air. (1) (2) (3) (4) (5) (6) Examine  bearings  for  indications  of  corrosion  and  pitting.  Lubricate  each  ball  bearing  with clean engine oil. Hold bearing inner race from turning and revolve outer race slowly by hand,  checking  for  rough  spots. Check oil seal rings, carriers, and collars for wear and scoring. When replacement of an oil seal  ring  or  carrier  is  necessary,  replace  both  parts  together. Inspect blower lobes and sealing ribs for burrs and scoring. If rotors are slightly scored or burred, clean up with emery cloth. Examine rotor shaft serrations for wear, burrs, or peening. Inspect bearing and oil seal contact surfaces of shafts for wear and scoring. Inspect inside surface of blower housing for burrs and scoring. Inside surface must be smooth for efficient operation. If inside surface is slightly scored or burred, clean up with emery cloth. Check finished ends of blower housing for flatness and burrs. End plates must be flat against blower  housing. CAUTION Use care not to remove metal at joint face between end plates and housing. Air or oil leaks  could  develop  after  assembly. (7) Finished inside face of each end plate scored or burred, clean up with emery must be smooth and flat. If finished face is slightly cloth. NOTE When required, replace blower gears as a set. (8) Examine serrations in blower timing gears for wear and peening. Check gear teeth for wear, chipping,  or  damage.  Gear  backlash  between  gear  teeth  must  not  exceed  0.004  inch. WARNING Compressed  air  used  for  cleaning  purposes  will  not  exceed  30  PSI.  Use only  with  effective  chip  guarding  and  personal  protective  equipment (goggles/shield,   gloves   etc). (9) Clean oil strainer in vertical oil passage at bottom of each blower end plate and blow out all oil  passages  with  compressed  air. (10) Examine blower drive support, coupling seats, spring seats, and springs for cracks and broken  parts. 4-239


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