﻿GET_GEVOMechL2_09_01_01_09 - ANIMATION Screen
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Engineering recommends that all alternator brushes should be replaced at each maintenance interval.

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<b>Warning:</b> Disconnect the Multiple Unit (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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Rotating equipment is present in the alternator.

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To prevent physical injury, stay clear of all rotating equipment, and be sure to observe all Railroad and Government Safety Precautions.

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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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For ES44AC locomotives, capacitors in the inverter circuits may not be fully discharged and lethal voltages may exist.

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Before entering the auxiliary cab, raise and lock the barrier bar in the vertical position by securing a padlock in the supplied hole.

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Wait until the LEDs on the Common Power Indicator (CPI) are extinguished before entering.

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If the LEDs do not go off, then run the Crank Transfer Switch (CTS) self-test and move the CTS into the “CENTER” or propulsion position.

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If the LEDs remain lit, open the Battery Switch (BS) located in CA1 and verify that the LEDs on the CPI panel are extinguished.

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For ES44DC locomotives, lethal voltages may be present.

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Follow all railroad operating procedures.

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Before entering the auxiliary cab, raise and secure the barrier bar in the discharge position.

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Ensure that all lights on the CPI panel above the auxiliary cab door are extinguished.

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Using a voltmeter, verify a zero voltage.

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Failure to do so may result in serious injury or death.

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When inspecting brushes:

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Ensure that the pigtails are positioned correctly.

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They must be parallel with, but not rubbing against, the pressure arm.

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Ensure that the pigtail terminal bolts are tight.


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Move the brushes up and down several times in the brush holders to release any carbon dust or foreign matter in the carbon ways that could prevent free movement of the brushes.

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<b>Note:</b> When replacing brushes because of wear, always replace the complete set of brushes even though some may still be long enough to pass the minimum length test.

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Often a long brush is a high resistance brush and does not share current properly.