Charging Systems: Generator: Inspection

Standard length: 

10.5 mm 

Minimum length: 

4.5 mm 

If the exposed brush length is less than the minimum, replace the generator brush holder assembly.

Fig 1: Inspecting Generator Brush Holder Assembly

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1. When rotating the bearing, check that the bearing does not become stuck and that there is no unusual noise.

   If the bearing becomes stuck or there is unusual noise, replace the generator rotor assembly.

   Fig 2: Inspecting Generator Rotor Assembly

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1. Measure the resistance between the slip rings.

   Standard resistance: 

   1.5 to 1.9 Ω 

   If not within the specified range, replace the generator rotor assembly.

   Fig 3: Measuring Resistance Between Slip Rings

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2. Measure the resistance between the slip ring and rotor core.

   Standard resistance: 

   1 MΩ or more 

   If not within the specified range, replace the generator rotor assembly.

   Fig 4: Measuring Resistance Between Slip Ring And Rotor Core

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Using a vernier caliper, measure the diameter of the slip ring.

   Standard diameter: 

   14.2 to 14.4 mm 

   Minimum diameter: 

   14.0 mm 

   If not within the specified range, adjust the diameter with sandpaper (#400).

   If less than the minimum, replace the generator rotor assembly.

   Fig 5: Measuring Diameter Of Slip Ring

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If the bearing becomes stuck or there is unusual noise, replace the generator rotor bearing.

Fig 6: Inspecting Generator Rotor Bearing

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