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ARMY TM 9-2815-255-24 AIR FORCE TO 38G1-95-2 MARINE CORPS TM 2815-24/4 FIGURE 3-16.  Removing Brush Holder Assembly 3-12.4.  Inspect and Measure/Repair. a. Check armature commutator run-out as follows: (1) Place armature bearings on V-blocks. (2) Zero dial indicator on commutator. (3) Rotate armature and record run-out.  Standard is 0.0008 inch (0.02 mm), with a limit of 0.00197 inch (0.5 mm). (4) If run-out exceeds limit, replace armature. b. Using  a  micrometer,  measure  OD  of  commutator.    If  measurement  is  less  than  1.38  inches  (35  mm),  replace armature. c. Measure  commutator  segment  mica  depth  as  shown  in  FIGURE  3-17.    If  depth  is  less  than  0.0079  inch  (0.2 mm), undercut the mica. d. Check  commutator  surface  for  bum  spots.    This  usually  indicates  an  open  circuit.    Remove  these  spots  using #400 abrasive paper. e. Inspect bearings (33 and 34, FIGURE 3-15) for wear and damage.  If damaged or worn, replace bearings using a press. FIGURE 3-17.  Measuring Segment Mica Depth 3-38


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