Charging System: Generator: Inspection

INSPECT GENERATOR ROTOR ASSEMBLY
1. Check the rotor for an open circuit.
  1. Measure the resistance between the slip rings.
    Standard resistance: 2.3 to 2.7 Ω at 20°C (68°F)
    
    If the result is not as specified, replace the rotor assembly.
    
    Fig 1: Measuring Resistance Between Slip Rings
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check if the rotor is grounded.
  1. Measure the resistance between the slip ring and rotor.
    Standard resistance: 10 kΩ or higher
    
    If the result is not as specified, replace the rotor assembly.
  Fig 2: Measuring Resistance Between Slip Ring & Rotor
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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.
  - 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 3: Measuring Slip Ring Diameter Using Vernier Caliper
  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 4: Measuring Exposed Brush Length Using Vernier Caliper
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT GENERATOR DRIVE END FRAME BEARING
1. Check that the bearing is not rough or worn. If necessary, replace the bearing.
Fig 5: Checking If Bearing Is Rough Or Worm
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT GENERATOR ROTOR BEARING
1. Check that the bearing is not rough or worn. If necessary, replace the generator rotor.