STRAINER ASSEM. 2J2521 - Caterpillar

Use this procedure to troubleshoot a problem with the charging system. Also, use this procedure if one of the following event codes is active or logged.
Table 1
J1939 Code and Description Comments
167-0
Charging System Potential : High - most severe (3) The voltage from the alternator charging system has risen above the trip point for the programmed delay time.
The code is logged.
167-1
Charging System Potential : Low - most severe (3) The voltage from the alternator charging system has fallen below the trip point for the programmed delay time.
The code is logged.
167-15
Charging System Potential : High - least severe (1) The voltage from the alternator charging system has risen above the trip point for the programmed delay time.
The code is logged.
167-16
Charging System Potential : High - moderate severity (2) The voltage from the alternator charging system has risen above the trip point for the programmed delay time.
The code is logged.
167-17
Charging System Potential : Low - least severe (1) The voltage from the alternator charging system has fallen below the trip point for the programmed delay time.
The code is logged.
167-18
Charging System Potential : Low - moderate severity (2) The voltage from the alternator charging system has fallen below the trip point for the programmed delay time.
The code is logged. Probable Causes
Codes
Belts
Pulley
Bearings
Operation
Charging circuitRecommended Actions
Table 2
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Connect Cat® Electronic Technician (ET) to the service tool connector.
B. Look for active codes that are associated with the system for the event code.
Codes
Result: An associated code is active.
Repair: Troubleshoot any associated codes before continuing with this test.
Result: A code is active or logged.
Proceed to Test Step 2.
2. Inspect the Alternator Drive Belts
A. Inspect the condition of the alternator drive belts.
B. Check the belt tension and/or automatic belt tensioner.
Note: Excessive belt tension can result in damage to the alternator.
Belts
Result: The alternator drive belts and belt tensioner are OK.
Proceed to Test Step 3.
Result: The alternator drive belts and/or belt tensioner are NOT OK.
Repair: Repair or replace the damaged drive belts or belt tensioner.
If the problem is not resolved, proceed to Test Step 3.
3. Check the Condition of the Alternator Drive Pulley
A. Look for deep grooves that have been worn into the pulley by the belt.
B. Check that the nut for the pulley has not become loose.
Note: Make sure that the alignment is correct.
Pulley
Result: The alternator drive pulley is OK.
Proceed to Test Step 4.
Result: The alternator drive pulley is NOT OK.
Repair: Repair or replace the damaged alternator drive pulley.
If the problem is not resolved, proceed to Test Step 4.
4. Check the Alternator Bearings
A. Check the alternator bearings for signs of wear.
Bearings
Result: The alternator bearings are OK.
Proceed to Test Step 5.
Result: The alternator bearings are NOT OK.
Repair: Repair or replace the damaged alternator.
If the problem is not resolved, proceed to Test Step 5.
5. Check the Operation of the Alternator and Regulator
A. Verify that the alternator and/or the regulator is operating correctly.
Operation
Result: The alternator and or regulator are operating correctly.
Proceed to Test Step 6.
Result: The alternator and/or regulator are not operating correctly.
Repair: Repair or replace