﻿GET_GEVOMechL2_11_01_01_59 - ANIMATION Screen
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You have reached the end of this module!

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In this module, you learned to:

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State the purpose and location of the compressed air system.

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The compressed air system provides compressed air to the air brake system and to the auxiliary air-operated devices on the locomotive, including the horn and windshield wipers.

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The compressed air system and all its components, are attached to or located under the platform.

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The air compressor is located in the radiator cab.

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State the purpose and location of the major components of the compressed air system.

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The major components of the compressed air system include the air compressor, main air reservoirs, air dryer, final air filters, and safety valve.

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Air Compressor: Located in the radiator cab, the air compressor compresses ambient air and provides pressurized air to the system.

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Main Air Reservoirs: The main air reservoirs are located on the Engineer’s side of the locomotive in a notched area of the fuel tank.

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The main air reservoirs store compressed air for use by other components of the locomotive.

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Air Dryer: The air dryer is located on the Engineer’s side of the locomotive between the fuel tank and the number 2 truck.

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The air dryer removes moisture from the compressed air.

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Final Air Filters: The final air filters are located on the Engineer’s side of the locomotive between the fuel tank and the number 1 truck, under the walkway.

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The final air filters remove contaminants from the compressed air before it is distributed to the controlled components.

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Safety Valve: The safety valve is located between the two main reservoirs on the Engineer’s side of the locomotive.

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The J1 safety valve protects the air compressor and the rest of the compressed air system from an overpressure condition.

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State the purpose and location of the compressed air system instrumentation devices.

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The Air Reservoir Pressure Sensor (ARPS) measures the pressure of the air that is at the output of the first main air reservoir.

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The locomotive control system uses this information to turn the air compressor motor on and off and to control when the compressor is to load or unload.

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The ARPS is located on the air compressor control panel, which is in the radiator cab.

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Access to the panel is from the Engineer's side of the locomotive near the air compressor.

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The Air Compressor Speed Sensor (ACS) is used to detect the air compressor motor speed and send this information (a frequency) to the locomotive control system.

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The control system takes this information and uses it to determine if the compressor motor is operating at the correct speed.

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The ACS sensor is located on the end of the air compressor motor.

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Describe how the compressed air system operates.

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The compressed air system has four basic functions: compression, storage, filtration, and distribution.

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During compression, the outside air passes through two paper air filters and enters the air compressor.

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From the air compressor, the compressed air enters the first main reservoir, where cooling and moisture condensation take place.

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If air pressure exceeds 150 psi, a safety valve connected to the outlet of the first main reservoir opens.

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This protects the air compressor and the rest of the system from an overpressure condition.

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Compressed air from the first main reservoir flows in two ways.

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One path is to the main reservoir pressure sensor, which provides a feedback signal of the air pressure to the locomotive's control system, and the other path is to the second main reservoir and auxiliary air filter.

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The path to the second main reservoir may or may not have an air dryer, depending on customer requirements.

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In systems without an air dryer, a check valve connected between the output of the first main reservoir and the MR equalizing pipe allows consist air from another locomotive to enter this locomotive's air system.

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In systems with an air dryer, there are two check valves: one connected between the output of the first main reservoir and the MR equalizing pipe, which allows consist air from another locomotive to enter this locomotive's air system, and another connected between the output of the air dryer and the MR equalizing pipe, which allows air to flow to another locomotive in the consist.

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Air enters the second main reservoir through a check valve and then flows to the MR air filter.

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The check valve prevents air from flowing backwards to the first main reservoir.

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This ensures that if the first main reservoir loses air, the second air reservoir maintains enough supply air for one emergency air brake application.

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The final air filters filter the air before distributing it to the air brake system and the auxiliary air devices.

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Describe how to perform running maintenance related to the compressed air system.

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Daily or every trip, test the operation of the horn, bell, and wipers.

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Ensure proper operation of the air dryers, if equipped.

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Ensure the main reservoir condensate drain valves are in the automatic position and operating properly.

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Check the sand box for the level of sand and refill as necessary.

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Daily or every trip, check the air compressor oil level and add oil as needed.

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Daily or every trip, exhaust accumulated moisture and small amounts of lubricant through the aftercooler petcocks each time the oil level is checked.

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Daily or every trip, check the air dryer humidity indicator.

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A blue color indicates that the dryer is functioning properly.

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Lavender, white, yellow, or brown indicates possible dryer damage and that further inspection is required.

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Every seven to ten days, perform a complete laboratory analysis to determine if the oil is suitable for continued use.

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If acceptable, fill the oil to the FULL mark on the dipstick or gauge with an approved lubricating oil, else change the oil.

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At 92 days, check the operation of the compressor load/unload system.

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Every year, replace the air inlet filters, clean the exterior of the intercooler and inspect it for leakage, check the operation of the load/unload system, drain the oil and replace with new, replace the oil strainer, and clean the oil sump screen.

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Every year, check the operation of the J1 safety valve, verifying it opens at 150 psi.

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Every year, replace/renew the air compressor magnet valve and gasket on the magnet valve panel.

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Every year, change the final air filters.

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Every year, change the coalescer element of the air dryer (if equipped).

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Every year, change the direct line air filters to the univalve, shutter control magnet valves, and the CMV.

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Every year, replace the vent valve with a reconditioned valve.

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Every 3 years, replace the tinsel, brass, and valve located in the crankcase breather of the air compressor.