LABEL 5321447 - Caterpillar

Probable Causes
Alternator drive belts
Alternator drive pulley
Alternator bearingsRecommended Actions
Alternator Drive Belts
Inspect the condition of the alternator drive belts. If the belts are worn or damaged, replace the belts.
Check the tension on the belts. Adjust the tension, if necessary.
Ensure that the belts are in proper alignment. Inspect the alternator mounting bracket for cracks and wear. Repair the mounting bracket or replace the mounting bracket in order to ensure that the belts and the alternator drive pulley are aligned. Alternator Drive Pulley
Check the condition of the alternator drive pulley. Look for deep grooves that have been worn into the pulley by the belt. If there is excessive wear, replace the pulley. Check that the nut for the pulley has not become loose. If necessary, tighten the nut. Alternator Bearings
Check the alternator bearings for signs of wear. Repair the alternator or replace the alternator, as needed.