﻿GET_GEVOMechL2_02_01_01_89 - STEP-BY-STEP Screen
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Typical steps to replace the pre-lube check valve are as follows: 

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<b>Warning:</b> To prevent personal injury and potential equipment damage, ensure that the engine cannot be started before removing, installing, or adjusting any engine component. 

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Place the BS in the OFF position to prevent starting attempts. 

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Also, place the FPB, LCCB, and BCCB in the OFF position, and apply a warning tag on the EC switch. 

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<b>Warning:</b> If the locomotive is equipped with AESS, the diesel engine may start without operator action. 

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Exercise caution when working around the radiator cab. 

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Ensure that AESS is disabled before performing any maintenance on the locomotive. 

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

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<b>Warning:</b> Ensure that the lubricating oil has completely cooled before any maintenance is performed. 

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Failure to allow the oil to cool could result in serious burns and/or personal injury. 

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<b>Note:</b> Lower than expected oil pressure may be due to a pre-lube check valve that is binding in the open position. 

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Main lube oil pressure is supposed to close the valve once the engine starts. 

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With the valve closed, a small orifice in the valve plate allows some oil to flow back to the pre-lube pump to spin it slowly and prevent motor bearing brinelling. 

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This may be observed on pump styles that have a removable end cover by observing the motor fan blades slowly rotating. 

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However, if the check valve remains fully open after the engine is running, oil pressure will be lost as a large amount of oil drains back to the oil pan through the pre-lube pump. 

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1. Remove the pre-lube supply hose from the check valve using a TESCO T87340 2 ¼-inch crow’s foot and breaker bar. 

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2. Remove the old check valve using a TESCO T87330 2-inch crow’s foot and breaker bar. 

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3. Insert and rotate the new check valve a few turns by hand to verify that the thread-o-let is not oval.
