VALVE AS-CHECK 5087766 - Caterpillar

Probable Causes
Alternator drive belt and tensioner
Alternator
Charging circuitRecommended Actions
Note: The procedures have been listed in order of probability. Complete the procedures in order.
Table 1
Troubleshooting Test Steps Values Results
1. Alternator Drive Belt and Tensioner
A. Inspect the condition of the alternator drive belt.
B. Check the belt tension. Check the automatic belt tensioner.
Note: Excessive belt tension can result in damage to the alternator.
Drive belt
Result: The alternator drive belts are not in good condition or the belt tension is incorrect.
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.
Result: The alternator drive belts are in good condition and the belt tension is correct.
Proceed to Test Step 2.
2. Alternator
A. Verify that the alternator is operating correctly. Refer to Special Instruction, REHS0354, "Charging System Troubleshooting" for the proper testing procedures.
Alternator
Result: The alternator is not operating correctly.
Repair the alternator or replace the alternator, as necessary. Refer to Disassembly and Assembly, "Alternator - Remove" and Disassembly and Assembly , "Alternator - Install" for the correct procedure.
Result: The alternator is operating properly.
Proceed to Test Step 3.
3. Charging Circuit
A. Inspect the battery cables, wiring, and connections in the charging circuit.
Charging circuit
Result: The charging circuit is not operating correctly.
Clean all connections and tighten all connections. Replace any faulty parts.
Result: The charging circuit is operating correctly.
If the procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).