I need any help if possible. I did everything with this riding mower from not moving in the past. Push the pin in the back so it could move. Even had the timing belt slip off a few times.. what happen to me today was my blade gaurd was a little low and I hit a stump that was in the ground and made a complete dead stop. And it wount move forward or backwards.. I kinda had this problem before the timing belt slipped so I had to remove the back battery and press on the gas to loosen up the pull to put my belt back on. But in this situation I notice the belt was fine but when I press on the gas the pully doesn’t move at all. So this is the problem I spotted my question is how do I fix it or part name so I can search for it. Any help would be much appreciated...