I tried with a puller, but broke the teeth off of the gear. After that, since I have a wooden workbench, I cut a slot in the edge just big enough for the shaft to slide on. Then, using a piece of 2x4 on the top of the shaft, I hammered it until it let go.
To reinstall it, I drilled a hole in the bench just big enough for the shaft, and used the 2x4 again to hammer the gear on.
My gear didn't pop anywhere, it was a tight fit until the very end.