INSPECTION PROCEDURE 1. INSPECT GENERATOR ROTOR ASSEMBLY
| (a) Check the rotor for an open circuit. (1) Measure the resistance according to the value(s) in the table below.
Standard Resistance: 100 A Type Type |
Tester Connection | Condition |
Specified Condition | |
Slip ring - Slip ring |
20°C (68°F) | 2.3 to 2.7 Ω | 150 A Type |
Tester Connection | Condition |
Specified Condition | |
Slip ring - Slip ring |
20°C (68°F) | 1.5 to 1.9 Ω |
If the result is not as specified, replace the generator rotor assembly. |
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| (b) Check if the rotor is grounded. (1) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
Slip ring - Rotor |
Always | 10 kΩ or higher |
If the result is not as specified, replace the generator rotor assembly. |
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(c) Check that the slip rings are not rough or scored. If rough or scored, replace the generator rotor assembly.
| (d) Using a vernier caliper, measure the slip ring diameter. 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. |
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2. INSPECT GENERATOR BRUSH HOLDER ASSEMBLY
 (a) Using a vernier caliper, measure the exposed brush length.
Standard exposed length: 10.5 mm (0.413 in.) Minimum exposed length:
4.5 mm (0.177 in.) If the exposed length is less than the minimum, replace the generator brush holder assembly.
3. INSPECT GENERATOR DRIVE END FRAME BEARING
| (a) When rotating the bearing, check that there is no abnormal noise and that it rotates smoothly.
If necessary, replace the generator drive end frame bearing. |
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4. INSPECT GENERATOR ROTOR BEARING
| (a) When rotating the bearing, check that there is no abnormal noise and that it rotates smoothly.
If necessary, replace the generator rotor assembly. | | |
