how do you remove a swamp cooler pillow block bearing that's stuck/seized/rusted on?
Oof, what a pain, I had a Champion swamp cooler with the same issue, except the collar was also rusted on. There's absolutely no way of getting leverage outside of possibly removing the entire squirrel cage, but then I'd be chancing the other side not coming off after the effort of removing the pulley wheel etc.

Wasn't sure what I was going to do but after reading your post I decided to give the hacksaw option a try, $10 and 15 minutes later and everything was off! So happy I found your post, would have been more money or a technician coming out otherwise.

I cut enough of a groove into each segment I was removing to insert a good flat head screw driver then gave it a little twist and they popped off really easily.