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Old 02-25-2016, 12:31 PM   #1
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Air compressor Brake system

I have a 1995 Monaco Dynasty with 300 Cummings, need the air compressor for the air bags and parking brake system. Anyone have an idea on how to replace this item or how to locate a replacement part.
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Old 02-25-2016, 12:37 PM   #2
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The compressor is a Cummins part. Get your engine serial number and call them to get the unit you need. Even NAPA should be able to cross reference it and get one for you.
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Old 02-25-2016, 12:50 PM   #3
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Give these folks a call for used parts.

Colaw RV Used Parts - We Have Your Part...
Walt & Will
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Old 02-25-2016, 12:59 PM   #4
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Are you sure it is the compressor. They are very reliable but do fail occasionally. Have you ruled out the governor, air dryer and safety valves etc?
The compressor is attached to the engine power take off on the right side as you face the engine from the rear of the coach. It is bolted in and has a air hose connected that goes to the air dryer. The governor is a small cylindrical unit with a couple of small air lines. Once correct pressure is reached the governor "unloads" the compressor and it free runs but does not pump air. At the same time the air dryer is supposed to purge any moisture from the dryer.
If the governor is stuck "unloaded" pressure will not build. The air dryer can fail as well and prevent pressure building. A leak in the system can also prevent pressure from building obviously.
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Old 02-25-2016, 04:03 PM   #5
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The compressor is not just for the parking brake and suspension. It is the backbone of the whole braking system. No air, no brakes.

It is rare that the compressor fails. If it did, it's not a simple job to change.

What kind of troubleshooting have you done to come to the conclusion that the compressor is bad ?

Two more common problems of no air pressure are, an air dryer with an open purge valve or the supply line from the compressor to the air dryer has a hole in it. (you can't hear the leak over the engine noise)
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Old 02-25-2016, 04:12 PM   #6
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Create an account with Cummins Quickserve site

It is free, once you have an account put in your engine SN. It will provide all the information you need as to your compressor. After you log in go to the Parts tab, it will then provide categories to choose from, go to Air Handling, then compressor.
Jim J
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