Sticking Valves?
FarmCat, I'm woridering the same thing as CitaBriaBob --if one of the valves is stuck. If you can swap the valves and the tractor starts going backwards, then you'll know for sure. Trouble is, I think you have to split a narrow frame to get the valves out. Some people have luck spraying penetrant on them and working them until they're free, but again, they're probably working on wide frames with removable tunnel cover.
If the linkage is free, try the valves.
Jeremiah
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