﻿GET_GEVOMechL2_11_01_01_60 - ANIMATION Screen
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Describe compressor loading and unloading.

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When loaded, the compressor motor is running and the compressor is compressing air.

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When unloaded, the compressor motor is running but the compressor is not compressing air.

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This change from loading to unloading is accomplished through the operation of the CMV and compressor unloader valves.

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The CMV is a solenoid operated valve that, when energized, closes to force air pressure to act on the compressor unloader valves.

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The unloader valves physically force the compressor intake valves to remain open, preventing the compressor from building pressure.

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Although the compressor drive motor may be running, since the compressor cannot build air pressure, the compressor is operating in an unloaded condition.

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When de-energized, the CMV opens, venting the air pressure supply to the unloader valves.

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The unloader valves then open, allowing the compressor intake valves to operate normally.

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With the compressor drive motor running and the compressor building air pressure, the compressor is operating in a “loaded” condition.

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Air Compressor Removal

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1. Open the drain cock at the side of the locomotive to drain the lubricating oil from the air compressor.

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2. Disconnect the lubricating oil drain piping at the pipe union.

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3. Remove the channel section from the radiator cab structure at the end of the air compressor removal slides on the A side of the locomotive.

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4. Remove the two bolts securing the door catch and remove the door catch.

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5. Disconnect air compressor motor power cables, speed sensor, and discharge piping at the aftercooler outlet flange.

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6. Exhaust the unloader piping, and remove the unloader hose from the air compressor.

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7. Remove the four air compressor hold-down bolts.

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8. Pull the air compressor to the walkway using a come-along and set it on the shop floor with a crane.

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Air Compressor Installation

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1. Carefully lift the air compressor with a crane and set the compressor on the air compressor slides, then use a come-along to move the air compressor into position in the locomotive.

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2. Install and tighten the four air compressor hold-down bolts.

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3. Install the unloader hose, air compressor discharge piping, motor speed sensor, motor power cables.

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4. Reposition the door catch and secure with two bolts.

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5. Install channel section from the radiator cab structure at the end of the air compressor removal slides on the A side of the locomotive.

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6. Connect the lubricating oil drain piping at the pipe union and close the drain cock, then fill the air compressor with oil.

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Coalescer Element Removal from the Air Dryer

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1. Remove the eight cap screws from the bottom of the air dryer and the coalescer cap.

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2. Remove and discard the O-ring and the coalescer element.

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Coalescer Element Installation in the Air Dryer

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1. Lubricate and install a new O-ring on the cap.

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2. Install the new coalescer element, then secure the cap with the eight cap screws.

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Filter Element Removal from the Salem 975 Filter

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1. Remove the six hex nuts and lock washers securing the bottom cap and drain valve.

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2. Remove the bottom cap, drain valve, wing nut, filter retainer, and filter element.

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Filter Element Installation into the Salem 975 Filter

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1. Clean the inside of the filter body and bottom cap with solvent.

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2. Carefully install the filter element on the filter retaining device in the filter body assembly, followed by the filter retainer and wing nut.

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3. Install a gasket on the bottom cap and assemble it to the filter body.

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4. Secure the bottom cap to the filter body assembly using six lock washers and hex nuts.

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Filter Element Removal from the Salem 824 Filter

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1. Disconnect the actuating air line to the drain valve.

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2. Remove the eight hex nuts and lock washers securing the sump bowl and drain valve.

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3. Remove the sump bowl and drain valve, wing nut and seat washer, and coalescer retainer, then remove the coalescer element and discard.

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Filter Element Installation into the Salem 824 Filter

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1. Carefully insert the new coalescer element into the filter body, followed by the coalescer retainer and wing nut.

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2. Reassemble the repaired drain valve to the sump bowl and the sump bowl to the filter body.

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3. Reconnect the actuating air supply line to the drain valve.


