your going to need something a bit more aggressive than wd 40 to get that key out. more of a high end penetrent if not some homemade. if its not in the way you can just leave it there.
once you have that bearing off, take some emery and evenly sand the shaft so the new bearing easily slides on and off. it may take a bit but take the time and be sure the bearing is free on the shaft. when your ready to button things up, a bit of anti-seize will help in the future.
once you have that bearing off, take some emery and evenly sand the shaft so the new bearing easily slides on and off. it may take a bit but take the time and be sure the bearing is free on the shaft. when your ready to button things up, a bit of anti-seize will help in the future.