Cummins/Onan — Disassembling the PMG
Repair & overhaul
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Before you start
- Disconnect the negative (-) battery cable first to prevent accidental starting.
- The rotor is magnetic and will attract the stator.
Procedure
- Disconnect the starting battery cables (negative first).
- Remove the PMG cover and disconnect the leads at the connector.
- Remove the bolts and clamps securing the PMG stator to the generator frame and carefully pull away the stator.
- Remove the rotor center bolt and pull away the rotor; put it in a clean plastic bag and do not take it apart.
- Stow the dowel pin in a safe place if it is loose.
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.