10-3. PERSONNEL AIR DUCT VENTILATING FAN REPAIR (continued).
Measure length of two brushes (24). Replace brushes (24) if measurement is less than 1/4 inch.
Inspect two brush caps (25). Replace if threads are damaged.
If armature or motor assembly is damaged or defective, or if armature shaft is worn
beyond the limits for proper bearing fit, replace motor assembly as a unit.
Test armature (31) on growler. If defective, replace motor assembly (23).
Using a multimeter, test motor housing (37) for shorts or open field windings. Replace if defective.
Inspect two bearings (28 and 36) (refer to TM 9-214). Replace if defective.