Hello! I have a Craftsman DYT 4000 Rider, and the problem I'm having is the chute attachment for the rear collection/storage buckets. It looks like I've got it all attached & connected to the deck, but nothing seems to go up the chute. Did I miss something? On the chute there's a "windmill like whirly-gig" that moves freely(actually it doesn't move for me while operating). Is that thing suppose to spin if grass is going up the chute? Any help?