[Billy-O]

I think it would be unlikely that both forward and reverse relief valves to be malfunctioning, unless seller has been using tractor as parts machine (you get the bad parts). I think something along driveshaft could be the problem.

Go and look. Take little money. Offer low. The seller needs to be motivated to sell low because it don't move. I'm was thinking maybe take extra relief valves if you have any....I'm not sure about that, because if tractor works again then seller will want more money.