One thing I didn't see mentioned, is to double check the PTO shaft for correct length. Attachments usually come with a generic length PTO shaft, and if someone at the dealership wasn't on the ball and didn't check the length of the shaft, you could create problems when you move your deck up or down. One way to check it is to mark the inner cover where the outer cover stops when the shaft is totally closed. Then install the PTO shaft, and very carefully raise and lower the deck to the ends of the 3PH travel. Check the cover marks you made and make sure there is some distance ~1/2" or so between your mark and the end of the cover. Then take the deck to both extremes (upper and lower) and adjust your top link in and out to cover any adjustments you might make to it. After you are sure there is some clearance at both ends, start your tractor, leave it at idle, engage the PTO, slowly release the clutch, and listen for any binding or BAD noises, then slowly raise and lower the deck while checking for binding. IMPORTANT: Do not leave the tractor seat for any reason while the PTO is engaged.
One little trick I've used to facilitate mounting a PTO driven attachment, is to mount one side of your lower arms, then mount the PTO shaft, then mount the other side arm, then the toplink. Doing it this way you have more room to muscle the PTO shaft on and off by swinging the one side away from the lower arm and actually getting in closer for more leverage. (Note: this will only work if you have a dolly or wheels under your attachment and are working on concrete. Both of which I highly recommend). IMPORTANT: Only do this with the tractor off, and the brakes locked.
Good Luck and congratulations /forums/images/graemlins/smile.gif