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1. Using a vernier caliper, measure the exposed brush length.
   

   Standard length:

   10.5 mm (0.413 in.)
   

   Minimum length:

   4.5 mm (0.177 in.)
   

   If the exposed brush length is less than the minimum, replace the generator brush holder assembly.
   

1. Bearing inspection
   
   

   1. When rotating the bearing, check that the bearing does not become stuck and that there is no unusual noise.
      If the bearing becomes stuck or there is unusual noise, replace the generator rotor assembly.
      

2. Measure resistance
   
   

   1. Measure the resistance between the slip rings.
      

      Standard resistance:

      1.5 to 1.9 Ω at 20°C (68°F)
      

      If not within the specified range, replace the generator rotor assembly.
      

   
   
   

   2. Measure the resistance between the slip ring and rotor core.
      

      Standard resistance:

      1 MΩ or more
      

      If not within the specified range, replace the generator rotor assembly.
      

3. Measure diameter
   
   

   1. Using a vernier caliper, measure the diameter of the slip ring.
      

      Standard diameter:

      14.2 to 14.4 mm (0.559 to 0.567 in.)
      

      Minimum diameter:

      14.0 mm (0.551 in.)
      

      If not within the specified range, adjust the diameter with sandpaper (#400).
      If less than the minimum, replace the generator rotor assembly.
      

1. When rotating the bearing, check that the bearing does not become stuck and that there is no unusual noise.
   If the bearing becomes stuck or there is unusual noise, replace the generator rotor bearing.