The older sleds don't have that option....just have someone lift the back of the sled to lift the track off the ground. Starting at the top of the secondary clutch, turn it slowly clockwise while at the same time start peeling the belt out of the secondary....after about a 1/4 turn, it will pop out. Wear gloves cuz your hands may get pinched. Its really not that tough after you do it a few times and develop a technique. Take note of the writing on the belt and be sure to re-install it the same way/direction
I know the king cats aren't the same that tip was for Lund and his wife's machine lol