Generator Inspection

Hold the center of the pulley, and confirm that the outer ring turns counterclockwise and does not turn clockwise.
If the result is not as specified, replace the clutch pulley.

Using a vernier caliper, measure the length of the exposed brushes.

Standard exposed length:

9.5 to 11.5 mm (0.374 to 0.453 in.)

Minimum exposed length:

4.5 mm (0.177 in.)

Check the generator rotor for an open circuit.

1. Using an ohmmeter, measure the resistance between the slip rings.
   

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   Slip ring - Slip ring	Approx. 20°C (68°F)	2.3 to 2.7 Ω

   If the result is not as specified, replace the generator rotor assembly.
   

Check the rotor for a short to ground.

1. Using an ohmmeter, measure the resistance between one of the slip rings and the rotor.
   

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   Slip ring - Rotor	-	1 MΩ or higher

   If the result is not as specified, replace the generator rotor assembly.
   

Check that the generator rotor bearing is not rough or worn.
If necessary, replace the generator rotor assembly.

Using a vernier caliper, measure the slip ring diameter.

Standard diameter:

14.2 to 14.4 mm (0.559 to 0.567 in.)

Minimum diameter:

14.0 mm (0.551 in.)

Check that the bearing is not rough or worn.
If necessary, replace the generator drive end frame bearing.