Generator Inspection

Hold the center of the generator pulley with clutch and confirm that the outer ring turns counterclockwise and does not turn clockwise.

Text in Illustration

	Free
	Lock

Using a vernier caliper, measure the exposed brush length.

Standard exposed brush length:

9.5 to 11.5 mm (0.374 to 0.453 in.)

Minimum exposed brush length:

4.5 mm (0.177 in.)

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

Check the generator rotor assembly for an open circuit.

1. Measure the resistance according to the value(s) in the table below.
   

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   Slip ring - Slip ring	20°C (68°F)	1.8 to 2.2 Ω

   Text in Illustration

   *a

   Slip Ring

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

Check the generator rotor assembly for a short to ground.

1. Measure the resistance according to the value(s) in the table below.
   

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   Slip ring - Rotor core	Always	10 MΩ or higher

   Text in Illustration

   *a	Slip Ring
   *b	Rotor Core

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

Check each slip ring.

1. Check that the slip rings are not rough or scored.
   If the slip rings are rough or scored, replace the generator rotor assembly.
   





2. Using a vernier caliper, measure the slip ring diameter.
   

   Standard diameter:

   14.2 to 14.8 mm (0.559 to 0.583 in.)
   

   Minimum diameter:

   14.0 mm (0.551 in.)
   

   Text in Illustration

   *a

   Diameter

   If the diameter is less than the minimum, replace the generator rotor assembly.