3114, 3116 and 3126 Engines Caterpillar


Alternator Noise

Usage:

AP-1000 1HD

Probable Causes

  • Loose alternator drive belt or worn alternator drive belt

  • Loose alternator drive pulley

  • Misaligned alternator drive belt

  • Worn alternator bearings

Recommended Repairs

Loose Alternator Drive Belt or Worn Alternator Drive Belt

  1. Inspect the condition of the alternator drive belts. If the alternator drive belts are worn or damaged, replace the belts.

  1. Check the tension on the alternator drive belts. Adjust the tension, if necessary.

Loose Alternator Drive Pulley

  1. Loosen the nut for the alternator drive pulley.

  1. Check the key groove in the pulley for wear. If the groove is worn, install a new pulley.

  1. Tighten the nut for the alternator drive pulley to the correct torque. Refer to Specifications, "Alternator" for the correct torque.

Misaligned Alternator Drive Belts

Inspect the alternator mounting bracket for cracks and wear. Repair the mounting bracket or replace the mounting bracket in order to ensure that the alternator drive belts and the alternator drive pulley are in alignment.

Worn Alternator Bearings

Inspect the alternator for worn bearings. Install new bearings, if necessary.

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