Generator -- Inspection |
| 1. INSPECT GENERATOR ROTOR ASSEMBLY |
Check the rotor for an open circuit.
Measure the resistance between the slip rings.
- Standard resistance:
- 1.8 to 2.8 Ωat 20°C (68°F)
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Check if the rotor is grounded.
Measure the resistance between the slip ring and rotor.
- Standard resistance:
- 10 kΩ or higher
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Check that the slip rings are not rough or scored.
If rough or scored, replace the rotor assembly.
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.)
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| 2. INSPECT GENERATOR STATOR SUB-ASSEMBLY WITH RECTIFIER |
- HINT:
- For terminal positions of the generator stator, refer to the illustration.
Inspect the positive (+) rectifier.
- HINT:
- Inspect the positive terminal after pulling it up.
Using an ohmmeter, connect one tester probe to the positive (+) terminal and the other to each rectifier terminal.
Reverse the polarity of the tester probes and repeat the step above.
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.
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Inspect the negative (-) rectifier.
Using an ohmmeter, connect one tester probe to the negative (-) terminal and the other to each rectifier terminal.
Reverse the polarity of the tester probes and repeat the step above.
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.
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Inspect the stator coil for an open circuit.
Measure the resistance between the rectifier terminals.
- Standard resistance:
- Below 1 Ω
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| 3. INSPECT BRUSH |
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Using a vernier caliper, measure the exposed brush length.
- Standard exposed length on new brush:
- 13.2 mm (0.520 in.)
- Minimum exposed length:
- 6.0 mm (0.236 in.)