GENERATOR INSPECTION


  1. INSPECT GENERATOR DRIVE END FRAME BEARING


    1. A015AQA

      Rotate the bearing and check that there is no abnormal noise and that it rotates smoothly.

      If necessary, replace the bearing Click here.

  2. INSPECT GENERATOR ROTOR ASSEMBLY


    1. A015BSOE01

      Check the rotor for an open circuit.


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

        Standard Resistance
        130 A Type
        Tester Connection Condition Specified Condition
        Slip ring - Slip ring 20°C (68°F) 2.3 to 2.7 Ω
        150 A Type
        Tester Connection Condition Specified Condition
        Slip ring - Slip ring 20°C (68°F) 1.5 to 1.9 Ω
        180 A Type
        Tester Connection Condition Specified Condition
        Slip ring - Slip ring 20°C (68°F) 1.36 to 1.76 Ω

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

    2. A015E1FE01

      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 kΩ or higher

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

    3. Check that the slip rings are not rough or scored.

      If rough or scored, replace the rotor assembly.

    4. A015DBYE01

      Using a vernier caliper, measure the slip ring 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 rotor assembly.

  3. INSPECT GENERATOR ROTOR BEARING


    1. A015C5XE01

      Rotate the bearing and check that there is no abnormal noise and that it rotates smoothly.

      If necessary, replace the generator rotor.

  4. INSPECT GENERATOR BRUSH HOLDER ASSEMBLY


    1. A015648E01

      Using a vernier caliper, measure the exposed brush length.

      Standard exposed length
      10.5 mm (0.413 in.)
      Minimum exposed length
      4.5 mm (0.177 in.)

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