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Old 09-18-2015, 07:46 PM   #1
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Surging Onan QD6000

The Onan QD6000 on my Excursion has about 105 hours on it and had been pretty reliable so far. I was taking the MH out for service and started the generator just to let it run for about 45 min during the ride. Shortly after it started and just after the timer switched power into the coach the generator started speeding up for a brief period, then slowing down again. It did this for a few moments, then I switched the AC units on and it seemed to stop. The ride to the shop was uneventful and I shut the generator down.

Maybe this is normal, but I've never heard it before. The service guys at the RV dealership don't know much about engines or generators and recommend having Cummins look at stuff like this.

Anyone have any idea what this might be? The morning was cooler than has been recently (Mid 70s as opposed to the 80s), but I can't imaging that has anything to do with it.

I don't think its a problem, but I have about 3 months left in the warranty and want to make sure if something is going south I get it looked at now.

Any ideas?
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Old 09-19-2015, 02:55 PM   #2
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surging generator

Hello my set is alot older but the surging you describe is what mine does also always has as soon as a load comes on line it smooths out and goes to work the term for this is Governor hunting it is trying to find its needed speed this is difficult with no load, if you have warranty left get it checked better than having to pay for it good luck Mike
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