Do you know if that threaded rod comes out? I don't think I can get to the engine end of that shaft to tap it.
Yes, the threaded Rod does come out.. Look at the Onan Parts & Service Manuals for a blow-up of the Genend, and you thread the Rotor Shaft end that fits in the end bearing...
I have all the Onan Manuals in .PDF format here.. Just PM me with the COMPLETE Model number and an eMail address that can except Large Attacments, and I will supply them a any Monkey... Or ask for them over in the Onan forum at www.smokstack.com...
I will put 2 nuts on the bearing end of the threaded rod and see if I can get it loose. Right now I cannot tap the armature shaft with a grease fitting because the grease would just come out the end with the threaded rod.
Don't know about that particular genset, but in many the shaft for the generator fits on a tapered shaft on the motor. We have a puller with two long arms that goes over the rotor, between the windings, and usually if you take the threaded bolt that goes thru the end cap bearing out about 1/4 in' put tension on the rotor with the arms and put pressure on the center bolt of the puller on the bolt and hit it with a hammer, the tension will pop it right off the taper. Didn't have luck just using a puller as length of bolt and the tight fit of the taper will keep it from just pulling off. The inertia of the rotor and the force on the bolt with a hammer usually works, sometimes it is rusted bad and nothing works, but usually the same tricks you use for removing the flywheel on a small engine will work on rotors.