I replaced the starter on two different Onan genset
Two different RVs
Had to drop the genset down both times
First was a swing down, pretty easy to do
The second one was tough
One by one I replaced the for four mounting bolts with long pieces of all thread
With double nuts for locking
Then with a floor jack under the Onan I slowly loosened each new all thread bolt taking turns and slowing letting it down to the point where I could reach the starter
The Onan was hanging from the all thread
Be sure to disconnect control wires, battery cables, fuel line and exhaust hangers before lowering it
So nothing snags or breaks