I have used this method numerous times with success. First I remove the zerk fitting, back off the retaining nut about 1/3 of the way. Next, I carefully heat the hex on the pulley until it is almost red hot. I recommend doing this outside because of fumes, potential fire and that it needs to be quenched with water. Cool the pulley quickly with water...grasp the hex on the pulley with channel locks and tap nut with hammer. CAREFUL NOW! You are removing the pulley...so don't be too aggressive as damage to threads could occur. This process has worked well for me!
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Queen Of The Quietlines! 
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