The pulley is keyed to the shaft. You will probably need to use a three jaw puller to remove it, also spray well with PB Blaster to help remove rust. Do not try to use a hammer to remove it as it is cast iron and is brittle. You can buy a cheap puller at Harbor Freight or try your local farm store. Also some auto parts stores will rent a puller.
Just review the thread in the link that Jeff sent and the parts breakdfown and you should be able to figurer it out. Remember that PB Blaster is your friend in this project.
Good luck, Later
tom
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