C1.5 and C2.2 Engines for Caterpillar Built Machines Caterpillar

Alternator Is Noisy

Usage:

CB-22B 2B2

Refer to Systems Operation, Testing, and Adjusting for information on possible electrical causes of this condition.

Probable Causes

Alternator drive belt
Alternator mounting bracket
Alternator drive pulley
Alternator bearings

Recommended Actions

Alternator Drive Belt

Inspect the condition of the alternator drive belt. If the alternator drive belt is worn or damaged, check that the drive belt for the alternator and the pulley are correctly aligned. If the alignment is correct, replace the drive belt. Refer to Disassembly and Assembly, "Alternator Belt - Remove and Install".

Alternator Mounting Bracket

Inspect the alternator mounting bracket for cracks and wear. Repair the mounting bracket or replace the mounting bracket. Ensure that the alternator drive belt and the alternator drive pulley are in alignment.

Alternator Drive Pulley

Remove the nut for the alternator drive pulley and then inspect the nut and the drive shaft. If no damage is found, install the nut and tighten the nut to the correct torque. Refer to Disassembly and Assembly, "Alternator - Install" for the correct torque.

Alternator Bearings

Check for excessive play of the shaft in the alternator. Check for wear in the alternator bearings. The alternator is a nonserviceable item. The alternator must be replaced if the bearings are worn. Refer to Disassembly and Assembly, "Alternator - Remove" and Disassembly and Assembly , "Alternator - Install".

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