@jthawthorne , John, You want to remove a stuck on brake drum correct! When they are stubborn like this,remove cotter key and castle nut, make sure park brake is fully off, some times there will be a ridge on the drum from wear and you must locate the adjuster and turn adjuster star wheel to release/decrease brake expansion allowing more play for drum to slip over worn ridge on drum. Spray spline liberally with a good penatrent oil. Hit drum with heavy hammer hard multiple times on the face edge of drum, this will normally send a good vibration to release drum from axle. Still not releasing the next step would be to heat drum at hub till almost red hot and then hammer off. If it is still not budging, time to bite the bullet. Get out the angle grinder with cutting wheel, cut 2 slot in the drums hub perpendicular/across to each other, cut almost to the axle spline(stop before damaging axle), then with a heavy hammer and cold chisel, place chisel in cut slot and hit solidly rotate to other cut slot in drum hub and repeat. This will spread/crack the hub from axle spline after a few tries, allow hub to come off. Now of course that means time for new hub $40-$50. Anti seize spline before putting drum back on. Good luck.
Check for retaining clip/c clip and remove. Check the attached link for instruction on hub/axle removal. Check the attached links,instruction and guides, Good luck.
I hope this helped you out, if so let me know by pressing the helpful button.
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