There is a screw puller, and the pully is actually press-fit onto the shaft. Do not get a cheap puller or it will come apart on you! Also, access to an air wrench for removal is a big help.
For installation, it's usually a 3/8"-16 bolt, a large nut, and I make sure to use a small stack of fender washers as a thrust bearing. Make sure to lubricate the shaft, shaft bore, and put a little assembly lube in the washer faces to make the job a little easier...
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