GENERATOR INSPECTION

  1. INSPECT GENERATOR PULLEY WITH CLUTCH

    1. Hold the generator rotor using SST, and turn the generator pulley with clutch clockwise to check that the outer ring locks.

      A011R3AE03
      SST
      09820-63021
      Text in Illustration
      *a Free
      *b Lock

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

  2. INSPECT GENERATOR DRIVE END FRAME BEARING

    1. Check that the bearing is not rough or worn.

      A011SDX
      OK
      The bearing rotates smoothly.

      If the bearing does not rotate smoothly, replace the bearing.

  3. INSPECT GENERATOR BRUSH HOLDER ASSEMBLY

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

      A011QV3E11
      Text in Illustration
      *a Length
      Standard exposed brush length
      9.5 to 11.5 mm (0.375 to 0.452 in.)
      Minimum exposed brush length
      4.5 mm (0.178 in.)

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

  4. INSPECT GENERATOR ROTOR ASSEMBLY

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

      A011RX4E02

      If necessary, replace the generator rotor assembly.

    2. Check the generator rotor for an open circuit.

      A011RU4E20
      Text in Illustration
      *1 Slip Ring
      *2 Ohmmeter

      1. Using an ohmmeter, measure the resistance between the slip rings.

        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.

    3. Check the rotor for a short to ground.

      A011UF5E15
      Text in Illustration
      *1 Slip Ring
      *2 Rotor
      *3 Ohmmeter

      1. Using an ohmmeter, measure the resistance between the slip ring and rotor.

        Standard Resistance
        Tester Connection Specified Condition
        Slip ring - Rotor 1 MΩ or higher

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

    4. Using a vernier caliper, measure the slip ring diameter.

      A011UC8E07
      Text in Illustration
      *a Diameter
      Standard diameter
      14.2 to 14.4 mm (0.560 to 0.566 in.)
      Minimum diameter
      14.0 mm (0.552 in.)

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