Generator Inspection

Check that the bearing is not rough or worn and that it rotates smoothly.
If necessary, replace the generator rotor assembly.

Check the resistance.

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   Slip Ring - Slip Ring	20°C (68°F)	1.8 to 2.8 Ω

   Text in Illustration

   *1

   Slip Ring

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




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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   Slip Ring - Rotor Core	Always	10 kΩ or higher

   Text in Illustration

   *1	Rotor Core
   *2	Slip Ring

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

Check each slip ring.

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





2. Using a vernier caliper, measure the slip ring diameter.
   

   Standard diameter:

   15.3 to 15.5 mm (0.602 to 0.610 in.)
   

   Minimum diameter:

   14.9 mm (0.587 in.)
   

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

Inspect the positive (+) rectifier.

HINT:

Inspect the positive (+) terminal after pulling it up.

1. Using an ohmmeter, connect one tester probe to the positive (+) terminal and the other to each rectifier terminal.
   

2. Reverse the polarity of the tester probes and repeat the step above.
   

3. Check that one shows a resistance of below 1 Ω and the other shows a resistance of 10 kΩ or higher.
   If the result is not as specified, replace the generator stator sub-assembly with rectifier.
   

Inspect the negative (-) rectifier.

1. Using an ohmmeter, connect one tester probe to each negative (-) terminal and the other to each rectifier terminal.
   

2. Reverse the polarity of the tester probes and repeat the step above.
   

3. Check that one shows a resistance of below 1 Ω and the other shows a resistance of 10 kΩ or higher.
   If the result is not as specified, replace the generator stator sub-assembly with rectifier.
   

Inspect the stator coil for an open circuit.

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

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   Rectifier Terminal - Rectifier Terminal	Always	Below 1 Ω

   If the result is not as specified, replace the generator stator sub-assembly with rectifier.
   

Using a vernier caliper, measure the exposed brush length.

Standard exposed length:

13.2 mm (0.520 in.)

Minimum exposed length:

6.0 mm (0.236 in.)