Rust around valve stem hole would likely be caused from a seep in the tube. Wouldn't have to be, but very likely. There would also be a possibility that the seep has been previously fixed, but the rust was left as is during the fix, or has come back.
I'm not sure if you can find out some honest information from current owner, beings the tractor is for sell. Hate to say it, but welcome to 2023. Some sellers will be honest with ya, and some won't. But, ... the seller should be able to tell you if the leaks have been fixed or not. Whether you should believe them or not, is another story and issue.
Assuming they haven't been fixed (the leaks anyways), there is 2 different ways this can go. You can fix immediately. Dismount tires, clean up and re-paint rims, and re- assemble and replacing the tubes with NEW tubes. GOOD tubes if going back with fluid filled. There are some cheap tubes out there that you can buy, but you'll want the GOOD ones for fluid. The other way, is to not fix them until you have to. This could vary and be 6 months or 6 years. You never know. Just add a little air once in awhile, and keep using until tractor tire won't hold air long enough to do anything anymore. By this time, the rim will likely be ruined, or at minimum will need to be fixed with a patch job at the valve stem hole area or rim just replaced with a new or good used one. Not sure of the availability of these rims, or how expensive. Back to the how long it will last if doing nothing, I have seen them go so long the metal of rim badly bubbles, then a big chunk of the rim completely breaks out, tube starts balloning out the hole and pops just like a balloon. And I have seen the valve stem hole get rough around the edges, and damage the valve stem itself around the outside, and more less establish a hole at the base of the stem at the tube. I seen a rim do this. It wasn't really badly rusted except the inner edges of valve stem hole. But it was rough enough to mess up the rubber valve stem at its base to the tube. So, the question of how long kind of depends on how things develope and what gives first. Rust is a cancer. And it will eat through metal. It just all depends where it messes up the tube at to the point a hole being big enough it can't be aired up anymore. There kind of isn't a way to guess how that is going to go.
I would be pricing tubes and rims (what you think would fix it now). And add the expense of the work if not going to do it yourself. Deduct that from the value that YOU place on this tractor. See how that compares to the asking price of this tractor. If asking price is over the price you came up with, then place the price you came up with, as an OFFER. If no can do on thier part, continue your search.
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