Ok Everybody, I believe I found the problem. I originally posted this question in another area, before I figured out how this forum works (still trying to figure it out) and just found some replies to that post and I think that it is my problem. See "milkman" reply below and my reply to it. It's the beet juice!
Quote Originally Posted by milkman View Post in another thread.
"If it is the hydrostat, putting it in 4wd wouldn't make it pull, it needs the hydrostat to move whether it's using the rear wheels or all four. I have beet juice in my rear tires and if the air gets really low, the wheel will slip inside one of the rear tires and won't pull, use 4wd till I get to an air hose."
When I first read milkman's response I laughed, because that seemed like an unlikely occurrence, but I immediately had a memory that the "bad" side had beet juice leaking from around the rim when my problem was occurring. I did not think they coincided, but I did pump the tire up to the correct pressure and I have since not had the problem with that right wheel not driving; Even still I did not think to connect the two as the same problem, but I believe that it was the leaking beet juice all along. Thanks for your help!