GET_GEVOMechL2_09_01_01_25 - ANIMATION Screen
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<b>Warning:</b> Disconnect the MU jumper cables connecting the locomotive being serviced to any other equipment prior to performing any maintenance tasks.

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Hazardous voltages may be present between interconnected units.

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Failure to disconnect the MU jumper cables from the locomotive being serviced may result in injury or death.

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<b>Warning:</b> Electrocution Hazard - Before performing any maintenance on the electrical equipment, ensure that there is no power on the traction or auxiliary alternator circuits.

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When inspecting the collector rings:

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Check each collector ring for looseness on the insulation and the associated stud rings for shorted studs or damaged insulation.

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Replace the collector ring hub assembly if defects are noticed.

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Look for yellow or white dust around the base of the ring and a measurable gap between the ring base and the insulation.

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A gap between the collector ring bore and the insulation will cause movement of the collector ring on the insulation when pressure is applied by hand on the collector ring.

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00:00:57,833 --> 00:01:01,750
Replace the collector ring assembly if the collector ring is loose.

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Look for ribbons of Teflon<sup>®</sup> at the location where the studs pass through the rings and for indications of arcing or other damage to the rings or studs.

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00:01:09,625 --> 00:01:14,583
Ribbons of Teflon<sup>®</sup> are an early sign of fretting between the stud insulation and the rings.

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Replace the collector ring assembly if signs of fretting are noticed.

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00:01:18,375 --> 00:01:21,917
Check the depth of the spiral grooves machined in the rings.

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When the alternator is new, the grooves are 0.140-0.180 inches (3.6-4.6 mm) deep.

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If they measure less than 0.020 inches (0.5 mm) deep, replace the collector ring hub assembly.

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Inspect the condition of the collector ring surfaces.

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Check for evidence of discoloration, etching, grooving, threading, or other signs of distress that require repair or replacement.
