Charging System (1AR-FE): Generator: Inspection

1. Using a vernier caliper, measure the brush length.

Standard length: 

9.5 to 11.5 mm (0.374 to 0.453 in.) 

Minimum length: 

4.5 mm (0.177 in.) 

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

Fig 1: Measuring Brush Length

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1. Check the rotor for an open circuit.
   1. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   STANDARD RESISTANCE
   
   

   Condition		Specified Condition
   Approx. 20°C (68°F)	except 150 A	2.3 to 2.7 Ω
   	150 A	1.5 to 1.9 Ω

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

   Fig 2: Checking Rotor For An Open Circuit

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2. Check if the rotor is grounded.
   1. Measure the resistance according to the value(s) in the table below.

   Standard Resistance 

   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.

   Fig 3: Checking Rotor Is Grounded

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

   Standard diameter: 

   14.2 to 14.4 mm (0.559 to 0.567 in.) 

   Minimum diameter: 

   14 mm (0.551 in.) 

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

   Fig 4: Measuring Slip Ring Diameter

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4. Check the appearance.
   1. Check that the bearing is not rough or worn and that it rotates smoothly

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

   Fig 5: Checking Bearing Is Not Rough Or Worn And Rotates Smoothly

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1. Check that the bearing is not rough or worn and that it rotates smoothly.

If the bearing does not rotate smoothly, replace the bearing.

Fig 6: Inspecting Generator Drive End Frame Bearing

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1. Hold the center of the pulley, and confirm that the outer ring turns counterclockwise and does not turn clockwise.

If the result is not as specified, replace the generator pulley with clutch.

Fig 7: Inspecting Generator Pulley With Clutch

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