﻿GET_GEVOMechL2_03_01_01_86 - STEP-BY-STEP Screen
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Typical steps to remove the univalve assembly are as follows:

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<b>Note:</b> Not all Evolution Series locomotives are equipped with a univalve assembly.

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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 components.

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Open the BS to prevent starting attempts.

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Also, place the FPB and the LCCB in the OFF position.

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Apply a warning tag to 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>Note:</b> To ensure successful univalve maintenance, note the pin position on the valve.

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The replacement valve must be inserted in the same configuration as the removed valve.

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Also, mark the ports of the copper air tubing that supply operating air to the univalve’s rotary actuator.

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The tubing will be removed and must be reattached to the correct ports.

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1. Shut down the diesel engine.

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2. Depressurize the cooling water system by holding the water fill assembly vent valve open for approximately one minute.

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3. With the engine shutdown and the cooling water system depressurized, ensure the radiators contain no water.

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4. Remove the bulkhead and radiator cab top covers to allow access to the univalve.

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<b>Note:</b> Steps 5 through 8 are applicable only for univalve model 84D709452G1RSM and do not specifically apply to univalve models 84A214652ABP2 and 84A214652ABP3, which may or may not include a vent manifold assembly.

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Refer to customer-specific drawings, manuals, and procedures for removal and installation of these models, which include a newly designed mounting bracket and may or may not include the necessary mounting brackets for the vent manifold assembly.

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5. Disconnect the three copper air tubes that supply actuating air to the univalve rotary actuator.

