How do you change a fan belt on a N14 cummins diesel?

To change the fan belt on a Cummins N14 diesel engine, first, ensure the engine is off and cool. Loosen the tensioner pulley using a wrench to relieve tension on the belt, then remove the old belt from the pulleys. Install the new belt following the correct routing diagram, ensuring it sits properly in the grooves of each pulley. Finally, re-tension the belt by adjusting the tensioner back into place and check for proper alignment before starting the engine.