Jinma tractors are bare bones discount tractors sold by some reputuable dealers and some fly by night operators. The tractors appear to be solid, but workmanship and attention to detail is lacking. They are often sold to people looking for a bargain at any cost. Consequently many people have become dealers and many buyers are simply uniformed. This is not to say you shouldn't buy one, if you have a decent set of wrenches and don't mind busting your knuckles every now and again to make sure things stay tight, and if you don't need some of the features found on the more expensive brands, then these can be very good bargain tractors (from what I hear). Finding a dealer can be a problem because many simply import them or buy a bunch, put them together, and then sell them and move on. I would let your eyes be the judge and not rely on the dealer who, if he even exists, is 2 states away. Very closely inspect the tractor, look for leaks, damage, broken mounts where plastic parts were over tightened, cracks in the metal, etc. This is the same inspection I'd give a "name brand" tractor as well, but I'd be double sure with a Jinma.
What is the asking price?