Jack the quad up by its under belly near the rear swing arm about its half way point so the tires are on the ground to remove weight from the bolt. A air hammer is helpful here to work it lose, a impact gun is also helpful if you have these tools. A long punch that will fit in the hole of the bolt and a 20lbbig sledge are a must. Just keep hitting it and trying different points with the jack level until you find its sweet spot. If no impact at least try getting it to turn every few hits. Takes a while but it will break loose. Good luck.
Sprayed the heck out of it with pb blaster, then I used an old tie rod that was laying around and smashed that into the bolt end, came out with a bunch of hits. This is fine, as long as you don't plan on ever using that tie rod again.
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