GENERATOR > INSPECTION

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1. INSPECT GENERATOR CLUTCH PULLEY


    A204784E02

  1. Hold the center of the pulley, and confirm that the outer ring turns counterclockwise and does not turn clockwise.
    Text in Illustration 
    *1
    		Free
    *2
    		Lock
    If the result is not as specified, replace the clutch pulley.



2. INSPECT GENERATOR BRUSH HOLDER ASSEMBLY


    A128079E02

  1. Using a vernier caliper, measure the length of the exposed brushes.
    Text in Illustration 
    *1
    		Length

    Standard exposed length:
    9.5 to 11.5 mm (0.374 to 0.453 in.)

    Minimum exposed length:
    4.5 mm (0.177 in.)

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



3. INSPECT GENERATOR ROTOR ASSEMBLY


    B012264E22

  1. Check the generator rotor for an open circuit.

    1. Measure the resistance according to the value(s) in the table below.
      Text in Illustration 
      *1
      		Ohmmeter
      *2
      		Slip Ring

      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.



    B012265E17

  1. Check the rotor for a short to ground.

    1. Measure the resistance according to the value(s) in the table below.
      Text in Illustration 
      *1
      		Ohmmeter
      *2
      		Slip Ring
      *3
      		Rotor

      Standard Resistance:
      Tester Connection
      		Condition
      		Specified Condition
      Slip ring - Rotor
      		Always
      		10 MΩ or higher

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



    A158899

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



    A153815E02

  1. Using a vernier caliper, measure the slip ring diameter.
    Text in Illustration 
    *1
    		Diameter

    Standard diameter:
    14.2 to 14.4 mm (0.559 to 0.567 in.)

    Minimum diameter:
    14.0 mm (0.551 in.)

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



4. INSPECT GENERATOR DRIVE END FRAME BEARING


    A108430

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