Cummins/Onan — Permanent Magnet Generator Removal
Repair & overhaul · PMG assembly
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan DFAA, Cummins/Onan DFAB, Cummins/Onan DFAC, Cummins/Onan DFBF, Cummins/Onan DFCB, Cummins/Onan DFCC, Cummins/Onan DFCE, Cummins/Onan DFE
Before you start
- The rotor assembly must not be dismantled, or the magnetic properties will be destroyed.
- Disconnect the negative (-) battery cable first to prevent accidental starting.
Procedure
- Disconnect the negative (-) battery cable to prevent accidental starting.
- Remove the control housing grille and access covers.
- 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 out.
- Store the rotor in a clean plastic bag until it is reassembled.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Three M5X12mm capscrews
Full service-parts list: Cummins/Onan DFBF →, Cummins/Onan DFCC →, Cummins/Onan DFCE →, 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.