GENERATOR > INSPECTION

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1. INSPECT GENERATOR ROTOR ASSEMBLY


    A117220
  1. Check the rotor for an open circuit.

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

      Standard Resistance:
      100 A Type and 130 A Type 
      Tester Connection
      Condition
      Specified Condition
      Slip ring - Slip ring
      20°C (68°F)
      2.3 to 2.7 Ω
      150 A Type 
      Tester Connection
      Condition
      Specified Condition
      Slip ring - Slip ring
      20°C (68°F)
      1.5 to 1.9 Ω
      If the result is not as specified, replace the rotor assembly.


    A117221
  1. Check if the rotor is grounded.

    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 kΩ or higher
      If the result is not as specified, replace the rotor assembly.
  1. Check that the slip rings are not rough or scored.
    If rough or scored, replace the rotor assembly.



    A117222E01
  1. Using a vernier caliper, measure the slip ring 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 rotor assembly.


2. INSPECT GENERATOR BRUSH HOLDER ASSEMBLY


A079305E02
  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.


3. INSPECT GENERATOR DRIVE END FRAME BEARING


    A156418
  1. When rotating the bearing, check that there is no abnormal noise and that it rotates smoothly.
    If necessary, replace the bearing.



4. REPLACE GENERATOR DRIVE END FRAME BEARING


    A156416
  1. Remove the 4 screws and retainer plate.



    A156417E01
  1. Using SST and a hammer, tap out the bearing.

    SST
    09950-60010   (09951-00250)
    09950-70010   (09951-07100)


    A156419E01
  1. Using SST and a press, press in a new bearing.

    SST
    09950-60010   (09951-00470)
    09950-70010   (09951-07100)


    A156416
  1. Install the retainer plate with the 4 screws.

    Torque:
    2.3 N*m{ 23 kgf*cm , 20 in.*lbf }


5. INSPECT GENERATOR ROTOR BEARING


    A163064
  1. When rotating the bearing, check that there is no abnormal noise and that it rotates smoothly.
    If necessary, replace the generator rotor.