TM-9-2815-220-24 Maintenance Manual for AVDS-1790-2CA AVDS-1790-DA and AVDS-1790-2DR Engines Download
Page 159 of 1563
TM 9-2815-220-24 GENERATOR ABNORMAL OPERATION (650 AMPERE) 0021 00 MALFUNCTION 2: (Continued) Undercharging (maximum indicator reading in “yellow” during vehicle operation. PROBABLE CAUSE CORRECTIVE ACTION c. Voltage regulator defective. (1) Inspect voltage regulator and replace if necessary (refer to pertinent vehicle technical manual). d. Generator drive gear assembly failure.. (1) Perform functionality check as follows: PROCEDURE OBSERVATION ANALYSIS Remove 1/8-inch pipe plug located in center of end plate and install 200 psi gauge. Oil pressure 100 ± 10 psi. Generator oil pump operation is normal, the generator is rotating and the drive coupling is functioning. Start and warm up engine at idle speed (675-725 rpm) to operating temperature (140 °F). Oil pressure same as normal engine gallery pressure (15-25 psi). Generator oil pump failed, and/or generator not rotating, and/or drive coupling failed. Go to next step. PROBABLE CAUSE CORRECTIVE ACTION d. (Continued) Failed generator drive gear assembly. (2) Check slip torque of drive coupling assembly (WP 0039) (3) If drive coupling is OK and generator failed functionality test, replace generator (WP-0051, Generator Replacement - 650 Ampere). MALFUNCTION 3: Overcharging (indicator reads right “red”). PROBABLE CAUSE CORRECTIVE ACTION a. Loose or corroded battery terminals, or grounded cables. (1) Inspect, clean, tighten, or repair as necessary (refer to pertinent vehicle technical manual). b. Defective batteries. (1) Check individual battery cells. Replace defective batteries (refer to pertinent vehicle technical manual). c. Voltage regulator defective. (1) Inspect voltage regulator and replace if necessary (refer to pertinent vehicle technical manual). WP 0021 00-3