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Armature Testing

  1. Use DVOM to check continuity between 2 side-by-side commutator bars. Check each segment the same way. If continuity is not present, replace armature. Check for continuity between each commutator bar and armature shaft. If continuity exists, replace armature.
  2. If commutator surface is rough, sand lightly with No. 500 or 600 grit sandpaper. Check commutator diameter. On Hitachi starters, minimum diameter should be 1.260" (32 mm). On Mitsubishi starters, minimum diameter should be 1.5" (38.1 mm). If commutator diameter is not within specification, replace armature.
  3. Check depth of insulating mold between commutator bars. If depth is less than .008" (.2 mm), undercut to .020-.031" (.5-.8 mm) with hacksaw blade.
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