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TM 9-2920-243-34 c, Remove  two  guard  washers  (A,  fig.  3-23)  and insulating bushing (B) from jumper screw (C). Slide  jumper  screw  out  of  commutator  end housing and then remove insulating bushing (D) and sealing ring (E). d. Remove three flat head screws (A, fig. 3-24) cover  plate  (B),  and  plate  gasket  (C).  Discard gasket. Remove two hex-socket head plugs (D) and oil wick (E). NOTE Do not attempt to remove bushing-type bearing unless inspection (para 3-14  h) indicates  need  for  replacement. Figure  3-23.  Removing  or  installing  brush  rigging  jumper screw and attaching parts. Figure  3-24.  Disassembling  or  assembly  commutator  end housing  assembly. 3-13.  Cleaning WARNING Particles  blown  by  compressed  air  are hazardous.  Make  certain  air  stream  is directed away from user and any other persons  in  area. a.  General.  Wash   all   parts,   except   those detailed in 3-13  b through 3-13f below, in dry- cleaning  solvent,  Type  II  (SD-2),  Specification  P- D-680, and dry with compressed air. b. Field Coils.  Clean field coils and field ring thoroughly  with  a  cloth  dampened  with  dry- cleaning  solvent.    Be  careful  not  to  damage protective  insulation  coating.  Dry  thoroughly with compressed air (15 psi max.). c. Armature.  Remove  loose  particles  from armature and wipe with a clean cloth dampened with  dry-cleaning  solvent.  Clean  commutator lightly with 00 sandpaper and remove all dust with  compressed  air. d. Brushes.  Clean  brushes  with  a  clean,  dry cloth  only.   Extreme  care  must  be  taken  to prevent  dry-cleaning  solvent  from  contacting brushes. e.  Relay  Coil  and  Shell  Assembly.  Only   ex- ternal  metal  surfaces  of  relay  coil  and  shell assembly  can  be  cleaned.  Clean  with  a  cloth dampened  in  dry-cleaning  solvent. f. Non-Metallic Components.  Do not clean such parts as sealing rings, insulating bushings, and insulating washers. Wipe with a clean, dry cloth. 3-14. Inspection a.  General.  Inspect  all  screws,  bolts,  nuts, threaded holes, and plugs for worn or damaged threads.  Replace  all  worn  or  damaged  parts. Inspect remaining hardware items and replace damaged  parts. b.   Pinion   Housing. (1)  Inspect   pinion   housing   for   cracks, distortion, and burs. Replace if damaged. (2) Inspect housing bushing-type bearing for score marks and wear patterns. Check bearing against  limits  specified  in  repair  and  rebuild standards (para 3-31  d) and replace (para 3-15  b ), if worn beyond limits. (3)  If  housing  bushing-type  bearing  is removed (para 3-15 b ), check diameter of bearing bore in pinion housing against limits specified in repair    and   rebuild   standards   (para   3-31d). Replace housing if worn beyond limits. 3-9


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