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Old 09-09-2021, 08:23 PM   #1
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Country Coach Owners Club
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Air Dryer Issue on 2008 Allure

This is an information type of note for not building air pressure in coach to release brakes.
I was trying to leave for Ida but when I went to air up coach it wouldn't build air pressure. I tried back feeding air through the front air drain valve. It built up air pressure that showed on both front/rear gauges. I then disconnected the line coming from my engine driven air compressor and hooked up an electric air compressor which also pressured up the coach. No leaks were ever detected.
So now I believe my engine driven air compressor is bad. But no, I connect a gauge to the engine driven air compressor and I have air pressure.
So now I'm very confused. I had already changed the governor in the early stages of troubleshooting with no improvement.
So now I find the fittings and bypass the dryer and everything works. I was able the leave town until power returned after storm.
I was able to find a complete dryer assembly and installed with everything returning to normal. I still don't understand why I was able to push air through the dryer with the electric compressor but not engine driven.
Sorry for the long note but hope it helps somebody down the road.

Another issue was trying to find the engine driven air compressor. Called many people and even Premier in Oregon. They say it was provided with the Cummins engine but Cummins parts department says no it was provided by CCI. I have reviewed the 200 page parts breakdown for my coach with no luck.
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Old 09-10-2021, 08:34 PM   #2
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I had this very same issue years ago and it turned out to be an inline check valve after the compressor was pugged up from oil sludge and would not allow the air to pass. This was on a 3 axle Freightliner tractor with the old 903 Cummins
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Old 09-11-2021, 09:05 PM   #3
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Thanks for the heads up. I have heard the check valves go bad as well.
Good fix with the dryer.
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Old 09-21-2021, 10:19 PM   #4
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A disturbing problem for people maintaining older coaches/engines is manufacturers are not supporting them as long as they used to. A couple years ago I worked on a 2006 Kenworth with a Cummins and had an extremely hard time finding an air compressor. Cummins said time is running out for "older" engine ancillary components and this was pre-pandemic.

Coaches with air suspension put a higher load on the air compressors so it is a little concerning they may be hard to find when it comes time to replace.

By the way your Cummins parts guy is wrong, the engine driven air compressor is a Cummins part. The electric leveling compressor is a coach part but that only runs when you are parked and auto leveling.
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Old 09-22-2021, 06:07 AM   #5
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Agree on the engine driven compressor comment. Typically a Bendix and widely available. I was able to get a rebuilt Bendix for the Detroit 8V71 in the 1965 MCI bus conversion we had prior to our CC.
In this business it seems you have to try several sources to get a satisfactory answer sometimes.
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Old 09-22-2021, 08:17 AM   #6
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My 2007 Allure (400ISL, CM850) air compressor is a Cummins part # 5301096. The recon number is 5301096RX. Replaced mine last year - part was about $1,800US for a recon.

They are a b***h to replace. Starter removed - coolant and oil lines are tough to get a wrench on - frame rail adds a few swear words to the repair.

Brian
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