Help with Gravely ZT2348 - gear problem?

[Royboy]

Hi folks! Not sure it is a gear problem, but beginning today when I start forward I feel a bumpiing/shaking at the right rear wheel. It almost feels like the rear tire is rubbing on the frame, but I don't think it is. This is what the feeling reminded me of when I felt it though.
Are there some adjustments that must be done periodically to keep this thing tracking correctly?
Any help appreciated!
Roy

 

[Royboy]

I guess I am bumping this problem of mine back to the top to see if I can get any help. Has anyone out there had a shaking/bumping/grinding problem on one side of their Zero-Turn mower? The problem seems to start with a turn to the left and then often continues as I straighten out. I simply have no idea how to begin troubleshooting the problem. Any help appreciated!

My dealer went bankrupt and it is a long way to the next closest authorized dealer.

Thanks for any insight!