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Inspection [06/2018 - ]: Procedure

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  1. INSPECT GENERATOR BRUSH HOLDER ASSEMBLY 
    1. 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.)

      GTY423027Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Length

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

  2. INSPECT GENERATOR ROTOR ASSEMBLY 
    1. Check the generator rotor assembly for an open circuit.
      GTY436906Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Slip Ring
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        Slip ring - Slip ring 20°C (68°F) 1.6 to 2.0 Ω

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

    2. Check the generator rotor assembly for a short to ground.
      GTY438560Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Slip Ring
      *b Rotor
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

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

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

    3. Check that the generator rotor bearing is not rough or worn and that it rotates smoothly.
      GTY194830Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

    4. Check the slip ring.
      GTY433587Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Diameter
      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. 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

        14.0 mm (0.551 in.)

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

  3. INSPECT GENERATOR DRIVE END FRAME BEARING 
    1. Check that the generator drive end frame bearing is not rough or worn and that it rotates smoothly.
      GTY768321Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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