GENERATOR INSPECTION

PROCEDURE


  1. INSPECT GENERATOR PULLEY WITH CLUTCH


    1. B000WBZC03
      B000XM7 Free
      B000TT4 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 BRUSH HOLDER ASSEMBLY


    1. B000VA3C02
      *a Length

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

      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.)

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

  3. INSPECT GENERATOR ROTOR ASSEMBLY


    1. B000YJ8C02
      *a Slip Ring

      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 Approx. 20°C (68°F) 1.36 to 1.76 Ω

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

    2. B000Z4KC03
      *a Slip Ring
      *b Rotor

      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 Always 10 kΩ or higher

        Note

        Perform the check on the fan portion of the rotor core that has not been coated with insulation paint.

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

    3. B000Y31

      Check that the generator rotor bearing is not rough or worn and that it rotates smoothly.

      If the generator rotor bearing is rough or worn, or does not rotate smoothly, replace the generator rotor assembly.

    4. Check the 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. B000UZEC02
        *a Diameter

        Using a vernier caliper, measure the slip ring diameter.

        Standard Diameter
        14.2 to 14.8 mm (0.559 to 0.567 in.)
        Minimum Diameter
        14.0 mm (0.551 in.)

        Tech Tips

        If the slip ring surface is dirty, polish it with sandpaper (400-grit).

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

  4. INSPECT GENERATOR DRIVE END FRAME BEARING


    1. B000XC2

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

      If the generator drive end frame bearing is rough or worn, or does not rotate smoothly, replace the generator drive end frame bearing.