Changing Power Steering Pump

Ok, Probably a easy task but I need help. Bought a new PS Pump has a smooth shaft with the end threaded out. My old pump has a threaded part in the pulley. What is the easiest way to get it off. I put a bolt in pulley and tried to thread it in to see if it would push it off while holding the hexed part on pulley, no luck.
Author: admin