I was given a Ransomes twin trak model XT2030 R on which the right drive wheel will not operate either forward or reverse but the left side works fine. I don't know much about this type of zero turn mower and I don't know how to go about fixing this problem. Any advice would be helpful. Is the mower even worth fixing? Motor runs good and only has 250 hrs on the meter. I found a parts manual but have not been able to find an operators manual. If anyone has advice on where to find one or can email me one, please let me know.