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Armature Test

  1. Check continuity between 2 side-by-side commutator bars. Check each segment the same way. If no continuity exists, 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 using No. 500 or 600 grit sandpaper. Using a micrometer or vernier caliper, measure commutator diameter. If commutator diameter is not within specification, replace armature. See MINIMUM COMMUTATOR DIAMETER  table.
  3. Check depth of insulating mold between commutator bars. If depth is less than .008" (.2 mm), using a hacksaw blade or file, undercut to .020-.031" (.5-.8 mm).
MINIMUM COMMUTATOR DIAMETER

Application In. (mm)
Q45 1.134 (28.8)
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