GENERATOR INSPECTION

PROCEDURE


  1. INSPECT GENERATOR PULLEY WITH CLUTCH


    1. A01W4QRE03
      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. A01W10E

      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.

  3. INSPECT GENERATOR BRUSH HOLDER ASSEMBLY


    1. A01W37YE23
      Text in Illustration
      *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.

  4. INSPECT GENERATOR ROTOR ASSEMBLY


    1. A01W2AS

      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.

    2. A01W0IJE20
      Text in Illustration
      *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) 1.5 to 1.9 Ω

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

    3. A01W1L5E19
      Text in Illustration
      *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 MΩ or higher

        If the result is not as specified, 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. A01W5E5E14
        Text in Illustration
        *a Diameter

        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 mm (0.551 in.)

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