Cummins/Onan — Permanent Magnet Generator (PMG) Removal
Repair & overhaul
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan DFE
Before you start
- The rotor assembly must not be dismantled, or the magnetic properties will be destroyed.
- The highly magnetic rotor will attract the stator core; avoid any contact which may damage the windings.
Procedure
- Turn off and disconnect battery charger (if equipped).
- Disconnect the negative (-) battery cable to prevent accidental starting.
- Remove the lower back panel of the control housing.
- Remove the three M5X12mm capscrews and lockwashers from the PMG cover, and remove cover.
- Disconnect the PMG wiring harness connector.
- Remove the four bolts and clamps retaining the exciter stator housing to the endbracket.
- Tap the stator housing out of its spigot and carefully remove from generator endbracket.
- Remove the hex head through-bolt from the rotor shaft and pull the complete rotor assembly from its location.
Specs & values
- Three M5X12mm capscrews
- Four bolts and clamps
Full service-parts list: Cummins/Onan DFE →
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.