It's not threaded on, it's a keyed tension fit. There is a thread visible in the center on the front end, but that won't help you a bit in getting it off.
Of course, I can't find it right off, but somebody will be along shortly with a link to pictures/descriptions of a homebuilt rig to pull it off in the absence of putting it in a big press.
Some heat will help, but don't go crazy with it. Enough, yes, can mess with your crank and that much isn't necessary. Just as important is not to try a two- or three-jaw puller on it -- they'll only chip out the rear of your pulley. It will take something like a bearing splitter in behind to pull it evenly.
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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