MASTER SHOE 7G3767 - Caterpillar

Probable Causes
Alternator drive belts
Alternator drive pulley
Alternator bearings
Charging circuit
Regulator
AlternatorRecommended Actions
Alternator Drive Belts
Inspect the condition of the alternator drive belts. If the alternator drive belts are worn or damaged, replace the belts. Refer to the Operation and Maintenance Manual.
Check the belt tension. Refer to the Operation and Maintenance Manual.
If the engine is equipped with an automatic belt tensioner, check the automatic belt tensioner. If necessary, replace the automatic belt tensioner. Note: Excessive belt tension can result in damage to the alternator.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. Note: Make sure that the alignment is correct.Alternator Bearings
Check the alternator bearings for signs of wear. Repair the alternator or replace the alternator, as needed.Charging Circuit
Inspect the battery cables, wiring, and connections in the charging circuit. Clean all connections and tighten all connections. Replace any faulty parts.Alternator or Regulator
Verify that the alternator or the regulator is operating correctly. Refer to Special Instruction, REHS0354, "Charging System Troubleshooting" for the proper testing procedures. Repair the alternator or replace the alternator, as needed.