Need Help: F-12 Brake Drum Removal

I have removed the big nut on each shaft. Tried to use two 3/8 bolts in the two holes in the right drum to pull it off the splined shaft, but it won't budge. This one has been outside for sometime without the brake cover. Even broke off a grade 8 bolt and called it a day after getting that out. Can I heat the drum around the splines or will that damage the shaft?

I strove mightily after removing that large nut you spoke of, no small task in itself as I needed to buy a 1 5/8 special air socket and used a huge cheater bar on a 3/4 ratchet. After removal the drum seemed as solidly fixed as before. I remember straining and prying until I was sure I'd destroy the workings I knew lay within the drum. In the end the fix was remarkably simple and which I hit upon only after failing to literaly "break" it loose with a pry bar. As I lay there panting with an mounting sense of alarm, I looked at the linkage that was used to set the brake. I took a large vise grips and clamping the pivot that the linkage rotated on I spun the linkage as if i were releasing the brake. Counter clockwise if I remember right but check for yourself to be sure. It was rusty but rotated with surprising ease. After that, the drum came off with very little resistance. The shoes were locked against the side of the drum and rusted in position. Possibly for decades. Once rotated back to the release position my problems were solved.

It was the first thing I did to that old tractor and seemed like a huge mile stone. I hope it works for you as well.