theslawek
I picked up a model 0055040 (2008 17kW) and its got a bad rotor that I'm rewinding. Unfortunately, whoever took the unit apart cracked both slip rings. I think the PN is G070892, but I'm hoping someone has a junk rotor laying around they can just remove the rings from so I can save a few bucks.

Outmost diameter is ~58-59mm
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78buckshot
For these small generators the normal procedure is replace stator and rotor as a combo, if you have the means to re-wind them you are far above the typical tech on this forum. I checked with the Generac site and that part number is listed. Shipping for a used rotor due to the weight may be higher than the value of new rings. The 2008-2009 era had other problems along with rotor delamination but I guess if you have the time and experience it's your option on repair. When I have a rotor or stator that has open or shorted windings it goes to the mixed copper/steel scrap bin. 
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theslawek
Thanks for your insight. I hear what you are saying and I have read that opinion many times throughout the various forums but I guess I am stubborn. 🙂 I can either spend $1500+ for a new set, or spend $90 for magnet wire (only 1/2 of rotor is shot, need to match 4.921ohms of the good side) + cost of revarnishing + whatever accessories and learn A LOT along the way. Just a side project for me as a young EE. I'll make a post if I succeed. I'd like to know I can do something like this if SHTF; It's very reassuring.

As far as the shipping goes, I would expect the seller to be able to pull off the bearing and subsequently the slip ring holder with a puller. The slip ring "posts" can be snipped off down lower.

Thanks!
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78buckshot
I do all of my own auto/truck/tractor/motorcycle/small engine repair and have various pullers, some of the other members here are also gearheads, you might get lucky enough to have one respond to your needs. Sounds like a fun project and I agree that it's a great learning opportunity.
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