Cummins/Onan — Commutator Turning in a Lathe
Repair & overhaul · armature commutator
From a Cummins/Onan service manual covering: 10C, 10CW, 10CW-150R, 5CW, 5TW-0R, 6CW-54R, 7.5C, 7.5CW, 8CW. Check it applies to your exact model before use.
Applies to: Cummins/Onan 10CW, Cummins/Onan 10CW-150R
Before you start
- Remove the ball bearing to prevent dirt getting into it.
Procedure
- Remove the armature and turn the damaged commutator or collector rings in a lathe.
- Remove the ball bearing before centering the armature in the lathe.
- Turn the surface until smooth.
- Undercut the commutator mica.
- Reduce runout at the bearing end before installing the end bell.
Tools required
- lathe Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Cummins/Onan 10CW →, Cummins/Onan 10CW-150R →
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.