This is going to be on removing blower wheels from blower motors I see a lot of guys that will just get a fancy puller they won't do any prep work on the motor shaft they'll just drop their puller on there and try to remove it. Sometimes it works sometimes it gets everything bound up to where you have to replace the blower wheel.
Basically, what I do is just loosen the set screw, you can see how rusty this one is right here but loosen the setscrew and force the wheel on the hub down farther first. You can see now we have some clean metal and then I just take a couple minutes to just with a piece of Emery cloth or sandpaper just clean this shaft up really really good. Take a couple extra minutes to prep that shaft once that's nice and clean you just grab something some sort of lubricant rust breaker wd-40 in this case spray a little bit on there and nine times out of ten this wheel will come right off no problems at all without any puller. I do hope that helps thanks for watching.