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Joe: It could be the linkage from the hitch control valve to the hitch lift cylinder. I'd check that one first. If you find the linkage intact, the problem has to be inside the control valve itself. There are a set of spider gears in there, much like a differential, they tie control lever side to the other side with lever the linkage from cylinder hooks to. It those spider gears break up it gives same effect as linkage being unhooked. I have no idea if those gears are still available. They were in the 1970s when I broke my first set. They were expensive back then, thus I just replaced the entire control valve with one from a 300 parts tractor I had. I lost draft control, in the change over. I was not using my hitch for in ground tillage thus draft control was not important to me. If you want the draft control working those spider gears have to work. Any hitch valve from a 230, 330, 350, 450, 240, 340, 460 or 560 will work and have draft control. If draft control is not important you can add 300 and 400 to the list and any control valve from all of these tractors will work. I give you this as should you decide to go that route. Personally if I were repairing this and draft control mattered, I'd buy new gears, your chance of getting a valve with gears that have long life left in them are slim.
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