Re: belts

  It's possible you have the wrong belt - too small given the augers turning with the clutch not engaged.
  The clutch may be adjusted for the old belt which had slackened.  The new belt which is tighter would probably require the clutch being backed off.
   If your clutch is backed off and the belt is still too tight then you probably need to go a size up.  That should not have to happen if you have the right factory belt.  
    It seems like you just have the wrong belt given the struggle to get it on.

David