I have had this tractor for many years and never paid attention to the bi turn. It developed a leak at the lever on the box and when I took it apart i found abroken ball bearing. Tryinh to understand how it works and set it up. Can not get the lever in the cab to move and can't see how it is hooked up. The linkage to the trans is disconnected and I still can't move the lever. Tried in neutral with clutch etc but seems to not want to move. I don't know if I have been using this or not. Seemed to turn very sharp. Any help would be appreciated