GENERATOR INSPECTION


  1. INSPECT GENERATOR PULLEY WITH CLUTCH


    1. A01G88DE03
      Text in Illustration
      *a Free
      *b Lock

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

      OK
      The outer ring turns counterclockwise and does not turn clockwise.

      If the result is not as specified, replace the generator pulley with clutch.

  2. INSPECT GENERATOR DRIVE END FRAME BEARING


    1. A01G7OV

      Check that the generator drive end frame bearing is not rough or worn and that it rotates smoothly.

      OK
      The bearing rotates smoothly.

      If the bearing does not rotate smoothly, replace the generator drive end frame bearing.

  3. INSPECT GENERATOR BRUSH HOLDER ASSEMBLY


    1. A01G7AFE12
      Text in Illustration
      *a Length

      Using a vernier caliper, measure the brush length.

      Standard length
      9.5 to 11.5 mm (0.374 to 0.453 in.)
      Minimum length
      4.5 mm (0.177 in.)

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

  4. INSPECT GENERATOR ROTOR ASSEMBLY


    1. A01G4R6

      Check that the generator rotor bearing is not rough or worn.

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

    2. A01G59BE12
      Text in Illustration
      *1 Slip Ring
      *2 Ohmmeter

      Check the rotor 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

        Approx. 20°C (68°F)

        for 130 A

        		 2.3 to 2.7 Ω

        Approx. 20°C (68°F)

        for 150 A

        		 1.5 to 1.9 Ω

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

    3. A01G5DLE06
      Text in Illustration
      *1 Slip Ring
      *2 Ohmmeter
      *3 Rotor

      Check if the rotor is grounded.


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

        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.

    4. Check the slip ring diameter.


      1. A01G9CKE07
        Text in Illustration
        *a Diameter

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

        Standard diameter
        14.2 to 14.8 mm (0.559 to 0.583 in.)
        Minimum diameter
        14.0 mm (0.551 in.)

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