Commutator Test
- If commutator runout is greater than specification, turn commutator on a lathe until runout is within specification. See COMMUTATOR SPECIFICATIONS table. If commutator runout exceeds service limit, replace armature.
- If commutator wear is less than .008" (.20 mm) on Nippondenso or .006" (.15 mm) on Mitsuba, use a hacksaw blade to undercut insulating mica to specification. See COMMUTATOR SPECIFICATIONS table.
COMMUTATOR SPECIFICATIONS
| Application | In. (mm) | |
|---|---|---|
| Mica Depth | ||
| Mitsuba | .016-.020 (.4-.5) | |
| Nippondenso | .020-.030 (.5-.8) | |
| Commutator Runout | ||
| Standard (New) | .001 (.03) | |
| Service Limit | .002 (.05) | |