How do you change the front tire on a John Deere 345?

Just like any other tubeless tire. You will remove the air from the tire and then get a pry bar and pull the bead over the outside part of the rim. Then you will get the other bead off the edge of the rim. My suggestions is to go to a local tire shop. Pay the fee, it is not worth thehassleand it will only take a few minutes.