I noticed the deck on my 520H seems to tult down quite a bit in the front. How do I go about leveling it? There isnt anything in my owners manual about doing it. Its a 1989 520H with a 48" side discharge deck. There is a linkage rod on the rear of the deck with a nut on it that looks like it is an adjustment but I would like directions before I start messing around with it. Thanks