How do you adjust 306TD alternator belt?

To adjust the alternator belt on a 306TD, first, loosen the bolts securing the alternator to its mounting bracket. Then, by using a wrench, carefully move the alternator away from the engine to create tension on the belt. Once the desired tension is achieved—typically around 1/2 inch of give when pressed in the middle—tighten the bolts securely to hold the alternator in place. Finally, check the tension again to ensure it remains correct after tightening.