Marathon — PMG Rotor Removal
Repair & overhaul
From a Marathon service manual — check it applies to your exact model before use.
Before you start
- Keep away from iron and steel parts that could be drawn to the magnets; keep away from components damaged by strong magnetic fields.
Procedure
- Remove the exciter armature and PMG stator (follow earlier instructions).
- Remove the snap ring which holds the PMG rotor in place on the shaft.
- Slide the PMG rotor off of the shaft.
- Remove the loading spring (check if stuck on back of PMG rotor).
- On 430 frame generators, remove the second inboard snap ring before removing main rotor.
Tools required
- Snap ring pliers Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Source: Marathon 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.