GENERATOR (for 80A Type) > INSPECTION

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1. INSPECT GENERATOR BRUSH HOLDER ASSEMBLY


A104556E03

  1. Using a vernier caliper, measure the exposed brush length.
    Text in Illustration  
    *a
    		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 exposed length is less than the minimum, replace the generator brush holder assembly.



2. INSPECT GENERATOR ROTOR ASSEMBLY


A067421E03

  1. Check the generator rotor for open circuits.
    Text in Illustration  
    *1
    		Slip Ring

    1. Measure the resistance between the slip rings.

      Standard Resistance:
      Tester Connection
      		Condition
      		Specified Condition
      Slip ring - Slip ring
      		20°C (68°F)
      		1.7 to 2.1 Ω

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



    A067422E03

  1. Check the generator rotor for short circuits.
    Text in Illustration  
    *1
    		Slip Ring
    *2
    		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
      		10 MΩ or higher

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



  1. Inspect slip rings.

    1. Check that the slip rings are not rough or scored.
      If rough or scored, replace the generator rotor assembly.



      2. A033341E03

    2. Using a vernier caliper, measure the slip ring diameter.
      Text in Illustration  
      *a
      		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 generator rotor assembly.



3. INSPECT GENERATOR DRIVE END FRAME


A219757E01

  1. Check the stator coil for open circuits.

    1. Measure the resistance according to the value(s) in the table below.
      Text in Illustration 
      *1
      		Ohmmeter

      Standard Resistance:
      Tester Connection
      		Condition
      		Specified Condition
      Coil lead - Coil lead
      		Always
      		Below 1 Ω

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



    A219758E01

  1. Inspect the stator for ground.

    1. Measure the resistance according to the value(s) in the table below.
      Text in Illustration 
      *1
      		Ohmmeter

      Standard Resistance:
      Tester Connection
      		Condition
      		Specified Condition
      Coil lead - Drive end frame
      		Always
      		10 kΩ or higher

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

  1. Inspect the bearing.

    1. Make sure that the bearing is not rough or worn. If necessary, replace the generator assembly.



4. INSPECT GENERATOR HOLDER WITH RECTIFIER


A182588E02

  1. Check the resistance.

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

      Standard Resistance:

      Tester Connection
      		Condition
      		Specified Condition
      P1, P2, P3 and B
      		Always
      		Resistance of below 1 Ω in one direction but 10 kΩ or higher in the other direction.
      P1, P2, P3 and E
      		Always
      		Resistance of below 1 Ω in one direction but 10 kΩ or higher in the other direction.

      If the result is not as specified, replace the generator holder with rectifier.



5. INSPECT GENERATOR REGULATOR ASSEMBLY


  1. Check the resistance.



      A182589E01

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

      Standard Resistance:

      Tester Connection
      		Condition
      		Specified Condition
      Terminals F - Terminals B
      		Always
      		When the positive and negative poles between terminals F and B are exchanged, there is a resistance of below 1 Ω in one direction but 10 kΩ or higher in the other direction.

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



      2. A182590E01

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

      Standard Resistance:

      Tester Connection
      		Condition
      		Specified Condition
      Terminals E - Terminals F
      		Always
      		When the positive and negative poles between terminals E and F are exchanged, there is a resistance of below 1 Ω in one direction but 10 kΩ or higher in the other direction.

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