Try using your favorite soaker...PB Blaster, Kroil, home brew, whatever. drive a dull chisel into the crack in the hub at 90 degrees to the axle and tap, tap, tap with moderate force with a 4 lb. hammer or so. HEAVY blows will crack this thin JD hub for sure. Thousands of hits later, constantly adding soaker to the crack, you'll see rust popping out with each blow. Gently heat occasionally with the rosebud, too much heat too quickly and the hub will split when cooling. I usually heat and walk away to let it cool and shrink. The heat is doing its thing as it cools, as the cast hub and the steel axle cool at a different rate. Once you see movement, drive it back the other way and then back and forth, cleaning with a wire wheel.
Its not unusual to take a lot of time to successfully remove these without damage. The last set took me 10 to 15 minutes every evening for several weeks to remove, but they did come off with no damage.
I have done all the above in addition to a 50 ton hydraulic jack against the end of the axle with a piece of grade 70 chain over the end of the jack and to each side of the hub held in place with appropriate grade 8 bolts. If the chain links are too small for the bolts, swell them in a vice with a drift punch and a little heat. Do the same with the link thats over the end of the jack. Oh yeah, a little prep with the jack: butt weld a grade 8 bolt stub on the end of the stem to hold the chain from popping off the side too easily. Then that jack becomes dedicated to hub removal duty, or just grind the bolt stub off.
Or...locate new hubs and heat these puppies up nice and red and beat'em off with a sledge....
Safety note...the 50 ton jack, if you so desire to use this option, will be under a lot of pressure and may "pop" off the axle and knock the dickens out of your leg or whatever is next to it. So be careful....grade 70 chain and grade 8 bolts are a must !!!!
I'm sure there are dozens of ideas, many much better than this and I hope you get some additional suggestions because I could use some more ideas myself...
Sorry for the length, it's hard to shorten without leaving out something....good luck, sir.