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Armature Test

  1. Place armature in growler. Turn on growler and hold hacksaw blade over armature. Slowly rotate armature. If core attracts hacksaw blade or if hacksaw blade vibrates, armature is defective. Replace armature. If hacksaw does not respond as described, go to next step.
  2. Remove armature from growler. Using an ohmmeter, check continuity between commutator and core, and between commutator and shaft. Continuity should not exist. If continuity exists in either case, replace armature.
  3. Check continuity between each commutator segment. If an open exists between any 2 segments, replace armature.
  4. Inspect armature for wear or damage due to contact with field coil magnets. Clean commutator surface and polish with No. 500-600 sandpaper if necessary. If surface is scored, out-of-round or pitted, turn commutator on a lathe.
  5. If mica depth is not within specification, undercut with a hacksaw blade to standard minimum depth. See STARTER SPECIFICATIONS  .
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