Charging System (Service Information): Generator: Inspection: Inspection

INSPECT GENERATOR CLUTCH PULLEY
1. Hold the center of the pulley, and confirm that the outer ring turns counterclockwise and does not turn clockwise.
  
  Fig 1: Inspecting Generator Clutch Pulley
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, replace the clutch pulley.
REMOVE GENERATOR DRIVE END FRAME BEARING
1. Check that the bearing is not rough or worn.
  
  Fig 2: Inspecting Generator Drive End Frame Bearing
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  OK
  
  The bearing rotates smoothly.
  
  If the bearing does not rotate smoothly, replace the bearing.
INSPECT GENERATOR BRUSH HOLDER ASSEMBLY
1. Using vernier calipers, measure the length of the exposed brushes.
  
  Fig 3: Measuring Exposed Brush Length Using Vernier Calipers
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  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 brush holder assembly.

INSPECT GENERATOR ROTOR ASSEMBLY

Check that the generator rotor bearing is not rough or worn.

Fig 4: Inspecting Generator Rotor Assembly
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If necessary, replace the generator rotor assembly.

Check the generator rotor for an open circuit.

Fig 5: Measuring Resistance Between Slip Rings Using Ohmmeter

GTY140009

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Using an ohmmeter, measure the resistance between the slip rings.

Standard resistance

Condition	Specified Condition
Approx. 20°C (68°F)	1.5 to 1.9 Ω

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

Check the rotor for a short to ground.

Fig 6: Measuring Resistance Between Slip Ring & Rotor Using Ohmmeter

GTY120759

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Using an ohmmeter, measure the resistance between the slip ring and rotor.

Standard resistance

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

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

Using vernier calipers, measure the slip ring diameter.

Fig 7: Measuring Slip Ring Diameter Using Vernier Calipers
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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.