I would really be concerned that this tractor is not paid off or, less likely, that it is stolen. If not paid off, it still belongs to the finance company and they will want it paid off or will want to come get their tractor. I hope that is not the case and that you just simply got a killer deal. It just sounds a little too good to be true.
A dealer could find out for you if Mahindra Finance has an outstanding loan on it. To check beyond Mahindra Finance would probably require a UCC search. You can PM me the serial number and your contact number and I can check for you if you would like.
Awesome tractor. I hope you got a killer deal and there are no complications.