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Old 04-11-2012, 12:14 PM   #1
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Air compressor cycling too often?

Can anyone give me an idea how often you should expect the air compressor to cycle on my 09 Dynasty? When driving it will run up to approx. 130 PSI, shut off and come back on at approx. 90 PSI - all this in about 45 seconds. It does this continuosly and I am worried about overworking the compressor. Possibly this is normal?

Any help is appreciated.
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Old 04-11-2012, 12:52 PM   #2
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Seems like a very short cycle, possible you may have a air leak.
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Old 04-11-2012, 12:58 PM   #3
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The 130/90 on/off sounds about right. What I WOULD be concerned with is the compressor coming on that often. I would suspect that you have a valve open or some other issue that is allowing the air to escape. You need to get it checked ASAP. Also keep in mind that your alarm should come on about 60 psi, at which time you need to pull over and figure out why your are loosing air.
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Old 04-11-2012, 02:22 PM   #4
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I had the same thing to happen and I found I had a bad inversion valve on a 99 dip it would not leak at idle with the park brake set but when I released the park brake ( chock the tires) with the engine at idle and the pressure up I could hear it at the driver side rear.
Also had a pressure leak on the Dyn and found a broke fitting in the air brake foot valve it was broke flush with the valve with about 1/8 inch holding it, I was lucky to get home.
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Old 04-11-2012, 03:11 PM   #5
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Ditto on the air leak. 45 seconds is WAY too fast to cycle from 130 psi to 90 psi under normal driving. Get it checked asap.
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Old 04-11-2012, 06:50 PM   #6
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You have a serious air leak. You might be able to hear it when parked. These leaks are often hard to find. Many possibilities: air hoses and connections, levelling valves, air bags, brake hoses. I would start by parking it where there is not a lot of noise. Get down low and listen all around the vehicle. Next you may have to get under to find the leak. There are valves all over your unit that can be the problem. If you are not ready to get under your unit( dangerous) then take it to a good truck dealer. You can also test the brake system for air loss by parking, engine off, block the wheels , park brake off. Air pressure over 100 pounds. Hold the brake treadle down for one minute. Gauge should not drop over 4 pounds. I am guessing it is going to be something simple. Our previous MH had this problem and it was a piece of welding slag from when the chassis was manufactured that burned a tiny whole in one of the nylon air lines. Didn't leak for 2 years as the undercoating had sealed the leak!
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Old 04-11-2012, 08:01 PM   #7
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I would check like mentioned above for an obvious air leak. If you can't find an air leak it will probably be the unloader valves in your compressor. The unloader valves will sometimes stick open and cause the exact symptoms you are describing. If not fixed right away this could damage your compressor to the point you will have to replace it. A good truck shop can fix this. Good luck.
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Old 04-11-2012, 08:17 PM   #8
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Quote:
Originally Posted by R2Home View Post
The 130/90 on/off sounds about right. What I WOULD be concerned with is the compressor coming on that often. I would suspect that you have a valve open or some other issue that is allowing the air to escape. You need to get it checked ASAP. Also keep in mind that your alarm should come on about 60 psi, at which time you need to pull over and figure out why your are loosing air.
If it gets down to 60 you may not have time to pull over, at about 45 psi the spring brakes should engage and stop you where you are.
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Old 04-26-2012, 11:17 AM   #9
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Many thanks to everyone who pitched in on this issue. Turns out I had a bad air fitting and you probably helped save me from what could have been a serious problem.
These beasts are a continual maintenance project and I now will start working on the next project.

Thanks again.
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