I have a 15x38" Murray. My drive belt keeps coming off. I got a new 73" belt from Outdoor Lawn Equipment. I can't get the belt on the back large pulley. The pulley is blocked by other parts. Can anyone help?

Lower your deck all the way and consider removing the deck (pain) if you still don't have room. You will need a helper to push down the cltch/brake peddle to get more room. Be 101% certain they gave you the correct belt.