Quantcast Figure 3-28. Checking armature eccentricity.

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TM 9-2920-243-34 Figure 3-28. Checking armature eccentricity. h.  Commutator  End  Housing  Assembly. (1) Inspect commutator end head for cracks, distortion, and burs. Replace if damaged. (2) Inspect bushing-type bearing for score marks and wear patterns. Check bearing against limits  specified  in  repair  and  rebuild  standards (para 3-31c) and replace if worn beyond limits. (3) If head bushing-type bearing is removed, check diameter of bearing bore in commutator end head against limits specified in repair and rebuild standards  (para  3-31c).  Replace  head  if  it  is  not within  these  limits. i.   Shaft   and   Lever   Assembly. (1) Inspect shaft for wear on shaft or burs in packing area. Replace shaft if worn or damaged. Examine  nylon  insert  in  threaded  portion  of  shaft and  replace  if  damaged  or  worn  beyond usefulness.  Check  against  limits  specified  in repair and rebuild standards (para 3-31b) and replace if parts are beyond these limits. (2) Inspect lever for wear on slider blocks. Replace  lever  if  wear  exists. 3-15. Repair a. General. The  following  subparagraphs  cover only  those  parts  wherein  a  repair  operation  will return damaged part to serviceable condition. Parts not detailed herein must be replaced when they fail to pass the required inspection (para 3- 14). b.  Pinion  Housing.   Smooth   minor   burs   or damage  on  mating  surfaces  of  pinion  housing with  a  fine  mill  file.  If  bushing-type  bearing  did not  meet  allowable  wear  limits,  remove  it  as shown in figure 3-29 and replace it with a new bearing. Press new bearing into position. Drill bushing  oil  hole  using  a  21/64-inch  diameter  drill and oil wick bore as a pilot. Ream bearing to a diameter of 0.750 ± 0.001-inch. Figure 3-29. Removing or installing bearing in pinion housing. c.  Shift  Housing  Assembly. (1)  Smooth  minor  damage  such  as  nicks, burs,  etc.,  on  mating  surfaces  of  housing  with  a fine  mill  file. (2)  If  bushing-type  bearing  did  not  meet allowable wear limits, remove the old bearing as shown  in  figure  3-30.  When  installing  a  new bearing,  reposition  housing  with  opposite  side  up from  that  shown  in  figure  3-30  and  press  bearing in flush with housing bore. Drill bushing oil hole using a 21/64-inch diameter drill and oil wick bore as a pilot. Ream bearing to a diameter of 0.875± 0.001-inch. NOTE Bearing can be pressed flush more easily if a 1-inch arbor is used. This will not allow bearing to be pressed below surface. 3-12


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