I have a similar motorhome, and your adjustment nut/screw is on the side of the gear box (been a long time but I think it is on the passenger side of the gear box.
There is a hole in the frame member that allows access to the adjustment nut/screw. I've adjusted mine several times until I got the excess movement out of it.
Note that I have assumed that you have the same 7.5 kw diesel generator that is installed in my motorhome. If your generator is different, you may have an access problem that I cannot visualize.
I think I used a socket with extension to break the nut loose, then adjusted the screw, then held the screw with the screwdriver while tightening the nut with a wrench.
I hope this helps.
Fred
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Fred & Vicki
St. Augustine, Fl.
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