There are no adjustments, It sounds like a bushing or the gears themselves are worn out. To find your parts you will need to find you tractor model numbers. You can also pull it apart and try to match up bearing sleeves to tighten up the meshing. I hope this helps, Matt
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Without the exact model we would be guessing. If its what im thinking of it can be done, its just tight and its best to pull the deck to get underneath to the bolts. Back then the only manuals they had were parts break downs, nothing step by step. WHere you start is pull the steering wheel and work your way down, once the steering shaft is out the you can work with the steering gear. Its just the matter of pulling one part at a time. Your biggest battle is going to be getting the parts.