The problem I had with the pulley was removing the nut. It's nearly impossible without an impact wrench, or without damaging something. On mine I used a pneumatic impact gun, solvent, a propane torch, and even a left-handed monkey wrench to no avail. It was a rebuilt unit, I wondered if the rebuilder used red Loc-Tite or something on it. On all the used 143 or 150 amp units I've bought, the nuts spun right off with the inpact gun. Not sure if they would have come off so easily with just hand tools...

Once the nut is off, the pulley pops off the shaft easily, no pullers required.