restosud
looking at service Manual for the air cooled G0065512 22kw évolution generator but fail to see any instructions on how the generator stator is to be clocked.
i know the harness come out the near the bottom and air intake should match up to back panel but still allows for a few degrees of rotation one way or another.

also, is there a spec of slipring runout?
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78buckshot
I clock them to match the air intake, no mention of it in the manuals or any of the classes I have been to, same with the slip rings. I don't think Generac intended for us to get very detailed in repair work. How are you going to tell if the slip rings are out of spec if they do provide the info?
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restosud
with a dial indicator.
reason i ask is i have a small wear pattern where about 1/2 of the slip ring circumference had a small groove from brush along with some slight fretting of the copper and this brush (one nearest engine) is slightly shorter(+/- 1/16" ) than the other .
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78buckshot
Are the brushes riding in the center of the slip ring? The most common problem I have seen is they are not centered and the brush overhangs the slip ring, as the brush wears the part that is not riding on the ring starts to ride on the insulation next to the slip ring and will eventually cause it to lose contact or run with high resistance, then the voltage regulator tries to feed more DC voltage to the brush and they arc and burn, sometimes to the point of melting the plastic brush holder.
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restosud
brushes were centered perfectly.the front ring (nearest bearing) has about 0.0055" and the rear ring has a little over 0.009" out of roundness.enough to feel it with your finger.
there is no discoloration or any signs of overheating.just this slight groove on almost 1/2 the slip ring circumference along with this light fretting at the beginning of the groove .i'm assuming it's the brush hitting this ramp that creates it.
will put new brush holder and keep an eye on it.
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78buckshot
You could try to dress the rings a little, they are pretty robust.
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restosud
the uneven wear is going to accelerate exponentially and cause brush bounce and many other issues so i think i'll true the rings as suggested.
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78buckshot
As long as you have it torn down you might as well make it right.
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Cobranut
78buckshot wrote:
As long as you have it torn down you might as well make it right.


I agree.  The little bit of additional work is well worth it to ensure you don't have to tear it down again anytime soon.
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78buckshot
 Restosud, are you going to pull the rotor and turn the rings?
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restosud
yes, will pull rotor and do it right.
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restosud
issue corrected.rings are now at less than 1 thou runout and polished.took 0.013" to get the worst of them back.
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78buckshot
Should purr like a kitten for many hours of outages, nice work.
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