How does this pulley come off?

Try this
http://www.grainger.com/Grainger/items/2HLF2?cm_mmc=Google%20Base-_-Pullers%20and%20Separators-_-KD%20TOOLS-_-KD%20TOOLS%20Power%20Steering%20Pump%20Pulley%20Kit,%20Removal%20And%20Installation%20Of%20Power%20Steer