I have a 522xi (model 73561) and have been having a problem with the steering for the last couple years. It started off not too bad but has progressively gotten worse. While the tractor is running I am able to turn the wheel easily, however when the wheel turn stops the steering wheel (and column) continue to turn. If this was the only issue it would be fine but while I am trying to mow the front wheels wander and I have to continually correct the steering to keep the tractor going straight. I thought there was potentially a coupler on the column that had loosened but when I inspected the column I couldn't find anything. Any suggestions?