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Commutator Test

  1. Ensure continuity exists between any 2 commutator segments. If continuity does not exist, replace armature.
  2. Clean commutator segment surfaces with No. 400 grit sandpaper (if necessary). If surface is scored, out-of-round, or pitted, replace commutator.
  3. Using "V" blocks and dial indicator, ensure maximum commutator runout and minimum commutator diameter do not exceed specifications. See STARTER SPECIFICATIONS .
  4. Measure undercut depth for insulating mica. Ensure standard undercut depth for insulating mica is within specification. Minimum mica undercut depth is .008" (.20 mm). If depth is not within specification, replace armature.
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