Generac — Main rotor assembly - GTA 315 and AG10 250 / 280 / 315
Repair & overhaul
From a Generac service manual — check it applies to your exact model before use.
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Procedure
- Position the O-ring in the back bearing channel to the bearing fitting.
- Insert the complete rotor in the horizontal direction into the stator carefully, with the pendulum device.
- Fit the bearing in the back bearing to the complete rotor seat.
- Install the coupling flange.
- Install the coupling discs.
- Manually fit the exciter rotor in the shaft and fasten the appropriate screws along with the mechanical lock.
- Fold the mechanical lock tips on the screw head.
- Connect the main rotor cables in the diode wheel terminals in the exciter rotor.
- Install the exciter cover.
Tools required
- pendulum device Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Source: Generac 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.