Not disagreeing with anyone that this can be bad for a buyer that buys from a scoundrel or even some changes in life situations (death, divorce, male menopause, mid life crisis, bad money manager, person of no integrity). First the loan is made to an individual with the tractor as collateral to be repoed if the debt isn't paid. There are people in civil court every day lined up trying to collect a debt (like money owed from non paying renters:thumbdown

and it is very difficult even after a Judge gives a ruling that the debtor is to pay but very little enforcement or even way to enforce. Police have other things of more importance than to help someone try and collect a debt or force an eviction.
I usually always buy new and if I bought a used tractor I'd do my due diligence to try and ensure there are no legitimate liens against it or I'd keep out the amount of the lien and get assurances from the lien holder that there will be no issues in getting a lien release with a certain dollar amount. Liens need to be recorded to be enforceable but that's not always 100% and like tractors the recording isn't in the county of purchase but at the state capital. Bottom line, never buy a used tractor unless it's from your Dad, if he's an honest man and won't get mad at you and stop making the payments.

This is a Big Boy world and if you don't know what your doing you can end up paying several times for an education.