Yup, pull the crank pulley. That's why the front axle has to come off. Engine needs to be at TDC. Then your marks should line up on the geartrain. Turn in the pump lock bolt and take it off. You should wait for the manual.
What happened if you don't mind? Ar eyou sure it's the pump?
Water will do a number on the Delphi pumps pretty quick.
Check price on a new pump before you pay to get it rebuilt. I found it was cheaper to get one through AGCO that have our local shop rebuild it.