I have a serious problem with my JRSC setup on the Lude

The Problem is that i shred my belt in just one day. A 6PK1930 was installed and when the motor was cold making some squeal noises. after 5 minutes it was completely gone in every rpm range.
The Belt was cutting itself on the outer edge and then shredding.
Was this maybe just a tension problem or do I need to align the Idlers? I have no idea what it could be.
