Table 15
Troubleshooting Test Steps
Values Results
1. Condition of the Alternator Drive Belts
A. Inspect the condition of the alternator drive belts.
B. Check the belt tension. If the engine is equipped with an
automatic belt tensioner, check the automatic belt tensioner.
Excessive belt tension can result in damage to the alternator.
Drive Belt Result: The alternator drive belts are in good condition and
the belt tension is correct.
Proceed to Test Step 2.
Result: The alternator drive belts are not in good condition
or the belt tension is incorrect.
Repair: If the alternator drive belts are worn or damaged,
replace the belts. Refer to Disassembly and Assembly for
the correct procedure.
If necessary, replace the automatic belt tensioner. Refer to
Disassembly and Assembly for the correct procedure.
2. Alternator Mounting Bracket
A. Inspect the alternator mounting bracket for cracks and
distortion.
Alternator Mount-
ing Bracket
Result: The alternator mounting bracket is cracked and
distorted.
Repair the mounting bracket or replace the mounting
bracket.
Note: The repair/replacement will ensure that the alterna-
tor drive belt and the alternator drive pulley are in
alignment.
Result: The alternator mounting bracket is OK.
Proceed to Test Step 3.
3. Condition of the Alternator Drive Pulley
A. Check the condition of the alternator drive pulley. Look for
deep grooves that have been worn into the pulley by the belt.
Check that the nut for the pulley has not become loose.
Alternator Drive
Pulley
Result: There is excessive wear on the alternator drive
pulley.
Repair: Replace the pulley.
Result: The alternator drive pulley nut was loose.
Repair: Tighten the nut.
Result: There is not excessive wear on the alternator drive
pulley.
Proceed to Test Step 4.
4. Wear of the Alternator Bearings
A. Check the alternator bearings for signs of wear.
Alternator Bearings Result: The alternator bearings are OK.
Proceed to Test Step 5.
Result: The alternator bearings are not OK.
Repair: Repair the alternator or replace the alternator, as
needed. Refer to Disassembly and Assembly for the cor-
rect procedure.
(continued)
74 UENR4469-36
Symptom Troubleshooting
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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