The short answer is typically the motor shaft runs thru the wheel and is held on by a set screw that you'll loosen to take it apart. Now getting everything out of the way so you can drop or slide the motor and housing out to do this is a bit trickier. I don't know what you have exactly but can say you have to pay close attention to how you take it all apart so you can put it back together correctly. It's not rocket science to take apart and put back together but if you don't take notes, pics, and/or pay attention to this dismount, you could have major problems. But your wheel will be clean. (Haha) For example, my circuit board is mounted in front of mine so I have to disconnect all the wiring and board before I can even get to the motor housing.