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Bench Tests: Commutator

  1. Inspect commutator for roughness, grooves, burns or pitting. Sand lightly with 500-600 grit sandpaper if necessary. Check commutator for out-of-round and mica insulators undercut to a depth of .020-.031" (.50-.80 mm).
  2. If necessary, commutator may be turned less than .04" (1.0 mm) from original size and mica undercut. Replace if excessively worn.
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