Hi and welcome the PTO belt should go on but it will have to be loosened up at the mule drive to fit over the pulleys.
Now if you mean the deck belt that hummm I dunno. It's way easier to just remove the deck because you have to put a lot of pressure on the springed tensioning pulley.
...now that I see your av you will have to drop the deck. The PTO belt is slightly off set up front. As you look at the tractor from the front. the left side of the belt is between the deck ears and the right side of the belt travels along the outside of the ears.