Gotta agree with the SeaFoam. But, I'd take a look at the number of hours on our gennie. If you are getting close to 900 hours or over, I'd look at brushes. Ours went out and we had to replace at about 800 hours. Just suggesting them based on the additional vibration. Also, double check your warranty. Onan (Cummins) has a very comprehensive 1,2,3 year warranty based on when the unit was placed into service.
Just a couple of more ideas to look at.
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US Army Retired - Loving The Road Trip
Challenger 37TB
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