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What AJ said, it really sounds like you are not getting enough heat to the base metal. The threads are most likely bonded together, also realize that a track frame probably ranks up high on the list of difficulty to disassemble, just by the location of those bolts, they seize up but good. Not familiar with that track frame, but assume from what you said the bottom rollers are worn out, so no worry about the innards and heat. I can't comment about the Mapp Gas you are using, but it sounds like you are just not getting enough heat to break the bond. The correct heat and the impact from a good whack from a hammer should break the bond, don't get me wrong, sometimes it's a project, but from similar things I've taken apart, heat, then work the bolt, little impact action, try to get that bolt to slightly turn either way, impact in either direction if possible, not sure if you can set that gun low enough just to vibrate the head a little in eqach direction, somehow you have to weaken and break that bond. The impact from a hammer may have to suffice, that will help weaken the bond. Some of those guys on ACMOC / ACME might be able to further advise you on technique, seen a lot of track frames apart from 60+ year old tractors, same category of difficulty level if not worse. I think some more heat to the surrounding metal is one big part of this. Whenever I don't use enough heat bolts seem to break a lot easier. I am not sure of any industrial penetrant that will actually wick in far enough, I have used a product by Gasoila called FREE-ALL, and out of everything I have tried, this one seems to have performed better, none of these will do miracles, its all about how far it wicks in the way I see it. Being fine thread and bonded by rust, you would have to immerse the track frame to really get anything to wick in. If you can get the base metal dull orange at least, don't quote me, that ought to be in the ballpark on the heat.
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