Guys, I have a 2006 John Deere 717A with around 1200 hours on it. The problem is when I engage the blades the blades are very slow to come up to speed. The belt does not squeal or there are no strange noises such as clutch chatter or anything. If the deck is up they do not seem to come up to speed at all, then if you put it down they come up to speed. Its weird. Has anyone ever seen this? Thanks guys.