Cummins/Onan — Withdrawing The Rotor From The Generator
Repair & overhaul · Generator rotor
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan MDGDA, Cummins/Onan MDGDB
Before you start
- Do not rest the rotor on the drive discs, blower or exciter.
Procedure
- Remove the generator adaptor casting on the drive disc end and the end plate on the bearing end.
- Cinch a lifting strap on the drive end of the rotor; lift the bearing end by hand and push toward the drive end until half the rotor core protrudes.
- Release the rotor weight and re-cinch the lifting strap around the middle of the rotor core.
- Withdraw the rotor until free of the stator, guiding both ends to prevent contact with stator windings.
- Rest the rotor in a cradle, supporting it on two pole faces - not on the drive discs, blower or exciter.
- Remove the retaining clip if the rotor shaft bearing is to be removed.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Cummins/Onan MDGDA →, Cummins/Onan MDGDB →
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.