Thank you, great to read that you both could cooperate 
Well…regarding wheel exchange…there is in fact a document by MIng cyle existent…
it would help (me) if you refer to that first (and I’ll tell you what’s wrong later 
):
https://drive.google.com/file/d/0BzaK6supp6fLS1dXVE9GSUNzOFk/view
Make yourself familiar with belt tension adjustment and the most important tool is a 60 mm Ø hook key for my meaning.
Please read page 21 “belt tension” of the manual and find the failure 
https://drive.google.com/file/d/0BzaK6supp6fLMm5CM1ZPN2txNEU/view