There is an easier solution to this..........
remove the top and back plates.
Place the new belt onto the motor pulley then onto the drum, it will not fit straight on so what you have to do is this, push on as far as you can, then start slowly rotating the drum holding the belt in place, do this until the whole of the belt is around the drum.
Just like you used to do when you were a kid when changing your inner tube on your bike.
Doing it this way mean you don't have to remove any working parts.
Hope this helps.
Bernie
Bernie Brennan, November 2006