Hello, I have a Thomas T83 and it has worked perfectly most of the summer for moving/landscaping dirt. Recently the drive on the right side has started ratcheting. Full input it works fine but, with a small amount of input, forward or backward, it pulses and is jerky. The fluid levels are all fine and the filter has been replaced. Any suggestions as to what may be the problem and where to start? PS. I can't believe how little information there is on the net for the T83....It's a great machine. Thanks. Dave