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Charging System (Service Information): Generator: Inspection: Inspection

  1. INSPECT GENERATOR DRIVE END FRAME BEARING 
    1. Rotate the bearing and check that there is no abnormal noise and that it rotates smoothly.
      Fig 1: Checking Generator Drive End Frame Bearing
      GTY128521Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      If necessary, replace the bearing See step  6.

  2. INSPECT GENERATOR ROTOR ASSEMBLY 
    1. Check the rotor for an open circuit.
      Fig 2: Measuring Resistance Between Slip Rings
      GTY145787Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      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) 1.36 to 1.76 Ω

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

    2. Check if the rotor is grounded.
      Fig 3: Inspecting Generator Rotor Assembly Resistance
      GTY148614Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      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 rotor assembly.

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

      If rough or scored, replace the rotor assembly.

    4. Using a vernier caliper, measure the slip ring diameter.
      Fig 4: Measuring Slip Ring Diameter
      GTY148615Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      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. Rotate the bearing and check that there is no abnormal noise and that it rotates smoothly.
      Fig 5: Checking Generator Rotor Bearing
      GTY142363Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      If necessary, replace the generator rotor.

  4. INSPECT GENERATOR BRUSH HOLDER ASSEMBLY 
    Fig 6: Measuring Brush Length
    GTY122608Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. 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.

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