SHAFT 7G9710 - Caterpillar

Use this procedure to troubleshoot a problem with the charging system. Also use this procedure if one of the following diagnostic codes is active. Refer to Troubleshooting, "Engine Monitoring Parameters" for information about engine events. Access the engine monitoring system on Caterpillar Electronic Technician (ET) in order to view the current trip points for these codes. For information on the engine monitoring system, refer to Troubleshooting, "Engine Monitoring System".
Table 1
Diagnostic Code
Description Conditions which Activate the Code System Response
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.
The red stop lamp is illuminated.
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.
The red stop lamp is illuminated.
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.
167-17 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. Probable Causes
Alternator
Condition of the alternator drive belts
Condition of the alternator drive pulley
Condition of the alternator bearings
Operation of the regulatorCharging Circuit
Inspection of the charging circuitRecommended Actions
Condition of the Alternator Drive Belts
Inspect the condition of the alternator drive belts. If the alternator drive belts are worn or damaged, replace the belts.
Check the belt tension. If the engine is equipped with an automatic belt tensioner, check the automatic belt tensioner. If necessary, replace the automatic belt tensioner. Note: Excessive belt tension can result in damage to the alternator.Condition of the Alternator Drive Pulley
Check the condition of the alternator drive pulley. Look for deep grooves that have been worn into the pulley by the belt. If there is excessive wear, replace the pulley. Check that the nut for the pulley has not become loose. If necessary, tighten the nut. Note: Make sure that the alignment is correct.Wear of the Alternator Bearings
Check the alternator bearings for signs of wear. Repair the alternator or replace the alternator, as needed.Operation of the Alternator or Regulator
Verify that the alternator or the regulator is operating correctly. Refer to Special Instruction, REHS0354, "Charging System Troubleshooting" for information that is related to the proper testing procedures.Repair the alternator or replace the alternator, as needed.Inspection of the Charging Circuit
Inspect the battery cables, wiring, and connections in the charging circuit. Clean all connections and tighten all connections. Replace any faulty parts. Refer to Testing and Adjusting, "Charging System - Test" for information that is related to testing the charging system.Refer to Testing and Adjusting, "Battery - Test" for information that is related to testing the battery.