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ARMY TM 9-2815-254-24 AIR FORCE TO 38G1-94-2 a. b. c. d. e. f. g. h. i. Do not clean overrunning clutch in solvent or other cleaning solution. Washing clutch will remove grease which may result in premature fail- ure of the clutch. Wipe  all  metallic  parts  with  a  cleaning  cloth  (TX-1250)  that  has  been  slightly  dampened  with  cleaning  solvent. Inspect all parts for damaged threads, cracks, distortion, or other visible damage. Inspect armature commutator. If commutator is dirty or discolored, clean with abrasive paper (#400). Use compressed air to blow sand out from between commutator segments. Inspect commutator for pits, scoring, excessive carbon, and oil. Turn armature commutator in a lathe to re- move  surface  pits,  scoring,  and  contamination.  Normal  diameter  is  1.89  in.  (48.0  mm),  minimum  after  turning is 1.77 in. (45.0 mm). Maximum runout should be 0.016 in. (0.4 mm) Total Indicator Reading (TIR). Clean around brushes and holders by wiping off all brush dust and dirt. If brushes are shorter than 0.45 in. (11.5 mm) they should be replaced. Check for free movement of brushes. Brushes should move freely when placed in brush holders. Replace brush springs if weak or worn. Inspect brush holders for discoloration, burrs, or signs of high temperature indicating defective insulators. Replace   brush   holder. Inspect armature shaft for damage and wear. Replace armature if damaged. NOTE If pinion gear is worn or damaged, inspect flywheel ring gear also. Inspect  armature  shaft  gear,  bearings,  and  pinion  gear  for  wear  or  damage.  Replace  any  part  that  is  damaged. 3-91


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