WoW! What a saga. And it only took 90 posts or thereabouts to get to the actual leak quantity.
One thing I have to say regarding what I believe was posted by Hutchman, regarding 11 states consumer protection laws, and those states not allowing AS IS/Where is statements when selling items:
Those laws pertain to RETAIL stores/purchases, NOT farmer Joe Bob transactions, IINM, (if I'm not mistaken).
But the bottom line in this story is buyers should be aware as is possible buying used equipment, especially if it has many years and or hours on it. There is something to be said for buying new, and I get it- not everyone can afford to do so, and sometimes the piece of equipment for a particular task is only available used.
Here's what I used to tell customer's and potential customers who came to my foreign auto repair and sales shop back in the mid-late 80's.
Back then if one was buying a 'cheap' used foreign car, of a certain make like Volvo, Saab, etc., to expect to spend at LEAST $2000, and then to add another $2K to the kitty IN CASE of unexpected repairs. If all of the $$K ended up being spent, then the buyer likely ended up with a fairly reliable car for some period of use, that could likely be sold later if needed to recoup some if not all of the expenditure(s).
This way potential buyers went in with their eyes open, knowing what a realistic expenditure might be for their used car purchase.
The OP's tractor seems to have gotten repaired, somehow, and now without all the legal craziness he might have had to endure had he gone that route. I personally look at court as an absolute last resort, similar to surgery. If it can be done any other way, with reasonable expense and little aggravation - go that way first. JMHO.