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Parts Replacement & Testing: Armature

  1. Check commutator-to-shaft (or core) for short circuit with 110 volt AC test lamp. Test lamp should not light (a slight glowing is okay).
  2. Using an armature growler, check armature coils for short circuit between windings. Check commutator for pits, burns or rough surface.
  3. If out of round exceeds .002" (.05 mm), or grooves or burned spots cannot be removed with fine crocus cloth, turn commutator. Undercut insulation between commutator bars to a maximum depth of .016" (.40 mm).
NOTE: Never use emery cloth or a file on commutator. Turn on a lathe only.
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