Hi Tom.
I have an ONAN 7.5 generator which blew a fan belt. I had to remove the generator to fix it. I also replaced hoses, thermostat and sensors while i had it open to avoid one of those going in the future. The thermostat is at the very top of the engine and you will have to drop the generator to get at it.
If you plan on doing this yourself, here is a link to how I went about it.
https://www.gsowners.com/forums/show...move+generator
Good luck with whatever you decide
Jim Cox