Again, since we don't know what kind of rig we're dealing with it makes the answer a little more difficult. That said, it is usually best to buy a pump with the pulley already installed if you don't have puller and installer. The installer can be made from a bolt, washer and nut and many times comes with the pump. The puller, not so much, and would need to be purchased separately if the pump doesn't come with a pulley. You can't do this job with a 2 or 3 jaw puller, you'll invariably bend the pulley. You need a puller that attaches to the hub in the middle of the pulley. Good luck.
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