TM-9-2350-277-20-1 Unit Maintenance Manual Volume 1 M113A3 M577A3 M1064A3 M1068A3 M58 Download
Page 126 of 858
TM 9--2350--277--20--1 0014 01--4 Change 2 YES NO 1. Engage variable speed fan drive manual override switch (see your -10). 2. Observe ventilating fan speed while helper (H) raises the engine rpm to a high idle (1500 rpm) and allows the engine to return back to idle. 3. Does speed stay the same? 1. Replace variable speed fan drive manual override switch (WP 0231 01). 2. Verify no faults found. 7Y 7YN YES NO 1. Observe rotation of ventilating fan (1) and generator drive pulleys (2) on drive unit. 2. Is fan pulley rotating as fast as the generator pulley? 1. Disengage variable speed fan drive manual override switch. 2. Replace variable speed fan drive (WP 0249 01). 3. Verify no faults found. 8Y 8YN 0014 01 E O VERHEAT S ( NEW VSF D CONF IGURAT ION) - Co n t in u e d ENGIN