GENERATOR INSPECTION

PROCEDURE

  1. INSPECT GENERATOR PULLEY WITH CLUTCH

    1. A211248C03

      *1

      Free

      *2

      Lock

      Hold the center of the generator pulley with clutch, and confirm that 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 BRUSH HOLDER ASSEMBLY

    1. A128079C14

      *1

      Length

      Using a vernier caliper, measure the brush length.

      Standard exposed length

      9.5 to 11.5 mm (0.374 to 0.453 in.)

      Minimum exposed length

      4.5 mm (0.177 in.)

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

  3. INSPECT GENERATOR ROTOR ASSEMBLY

    1. Check the generator rotor for an open circuit.

      1. A296802C01

        *1

        Slip Ring

        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)

        1.8 to 2.2 Ω

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

    2. Check the generator rotor for a short to ground.

      1. A296803C01

        *1

        Slip Ring

        *2

        Rotor

        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.

    3. A158899

      Check that the bearing of the generator rotor is not rough or worn and that it rotates smoothly.

      If necessary, replace the generator rotor assembly.

    4. Check each 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. A124106C05

        *1

        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

        14.0 mm (0.551 in.)

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