Commutator Mica Depth

4. If the surface is dirty, recondition it with a fine grade glasspaper. Then, check mica depth. If necessary, undercut the mica with a hacksaw blade to achieve proper depth.

Commutator Mica Depth

Standard (New): 0.4 ÷ 0.5 mm

Service Limit: 0.15 mm

86M 2009

1. A Commutator
5. Check for continuity between the segments of the commutator. If an open circuit exists between any segments, replace the armature.

86M 2010

1. A Armature tester
2. B Hacksaw blade
3. C Armature
6. Place the armature on an armature tester. Hold a hacksaw blade on the armature core. If the blade is attracted to the core or vibrates while the core is turned, the armature is shorted. Replace the armature.

86M 2011

1. A Shaft
2. B Coil core
3. C Commutator
7. With an ohmmeter, check that no continuity exists between the commutator and armature coil core, and between the commutator and armature shaft. If continuity exists, replace the armature.