How do you change a Ford 555D backhoe fan belt?

To change the fan belt on a Ford 555D backhoe, first, ensure the engine is off and cool. Begin by loosening the tension on the belt by adjusting the tensioner or removing the mounting bolts for the alternator or other accessories connected to the belt. Remove the old belt by sliding it off the pulleys, then install the new belt by routing it around the pulleys in the correct configuration. Finally, adjust the tension to ensure the belt is snug but not overly tight, and check for proper alignment before starting the engine.