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Armature Test

  1. Test armature for shorted coils with a growler. Check for grounded coils with a test light. Place one lead on armature shaft and other lead on commutator. Test light should not light. If test light lights, armature is grounded. Replace armature.
  2. Turn commutator if it is rough, worn, or has protruding insulation. DO NOT  turn to less than 1.65" (41.9 mm) diameter. Sand commutator lightly.
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