I got it used runs great I love it but it has 3 belts and the pto belt broke I don't know how to replace it properly the manuals I have for it only show how to replace the deck belt.we put the knew belt on and it runs but won't go into reverse unless I turn it off and I here a click towards the back also I have a hard time trying to shift gears while moving.any one out there that can help me ?