Charging Systems: Generator: Inspection

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

INSPECT GENERATOR ROTOR ASSEMBLY

Check the rotor for an open circuit.

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION

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.

Fig 2: Checking Generator Rotor Assembly (Open)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check if the rotor is grounded.

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

Fig 3: Inspecting Generator Rotor Assembly Resistance

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION

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

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

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

Fig 4: Measuring Slip Ring Diameter
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT GENERATOR ROTOR BEARING
1. Rotate the bearing and check that there is no abnormal noise and that it rotates smoothly. If necessary, replace the generator rotor.
  
  Fig 5: Checking Generator Rotor Bearing
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT GENERATOR BRUSH HOLDER ASSEMBLY
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.
  
  Fig 6: Measuring Exposed Brush Length
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002