I purchased an older Ransomes zero turn a few months ago to work on in my spare time. The mower had sat outside for a few years, but was running when parked with no problems. After alot of time and effort, the mower is running strong and has cleaned up nicely. The only problem is the left drive seems to be a little more dominant than the right. The left has to be backed off an inch or two to drive straight. Is this a major problem or can this be adjusted?