TM-9-2815-220-24 Maintenance Manual for AVDS-1790-2CA AVDS-1790-DA and AVDS-1790-2DR Engines Download
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TM 9-2815-220-24 GENERATOR ABNORMAL OPERATION (650 AMPERE) 0021 00 MALFUNCTION 1: (Continued) Not charging (indicator reads in “yellow” same as battery reading with engine stopped and master switch “ON”. PROCEDURE OBSERVATION ANALYSIS (Continued) 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. If slippage occurs below 167 foot pounds, drive gear assembly is defective. Check slip torque of drive gear assembly (WP 0039, NOTE: Generator must be removed (WP 0051). Note if there is slippage of the drive gear while increasing torque to 167 foot pounds. If no slippage occurs below 167 foot pounds, slip torque is acceptable, but gear assembly may have other damage (low torque rate). Proceed to next step. If rotation is more that 8°, but less than 17°, drive gear assembly is satisfactory. Check torque-rotational deflection rate (WP 0039) Note deflection in degrees from zero torque to 167 foot pounds torque. If rotation is greater than 17° or less than 8°, the drive gear assembly is defective. PROBABLE CAUSE CORRECTIVE ACTION d. (Continued) Failed generator drive gear assembly. (1) Replace drive gear assembly (WP 0156, Generator Replacement - 650 Ampere). MALFUNCTION 2: Undercharging (maximum indicator reading in “yellow” during vehicle operation. PROBABLE CAUSE CORRECTIVE ACTION a. Loose, corroded or grounded battery terminals or cables. (1) Inspect, clean, tighten, repair or replace as necessary (refer to pertinent vehicle technical manual). (1) Check individual battery cells (refer to pertinent vehicle technical manual). b. Defective batteries. (2) Replace batteries (refer to pertinent vehicle technical manual). WP 0021 00-2