How do you change drive belt on a John Deere 345?

To change the drive belt on a JOHN DEERe 345, first, ensure the engine is off and disconnect the spark plug for safety. Remove the mower deck by detaching it from the tractor, then locate the drive belt. Remove the old belt by releasing the tension from the belt tensioner, and install the new belt by routing it according to the diagram typically found on the mower deck or in the owner's manual. Finally, reattach the mower deck and reconnect the spark plug before testing the setup.