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Old 08-05-2015, 06:47 PM   #1
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Air Compressor troubles

I have a 2009 Damon Astoria Pacific Edition Class A. After driving for 2 days straight and an hour from my destination a warning light came on. I checked my gauges and my air tanks showed 65psi each. I pulled off the road turned everything off for 5 minutes and they filled back up. Drove for another hour and then t happened again. Today I went to get fuel and when I went to leave it did it again. After pressing the brakes a time or 2 the parking break kicked on and I was stuck. I turned off the engine for 5 minutes and nothing. Tried again 15 minutes later and nothing. Air wouldn't build up. While trying to get a mobile mechanic I started the motor again and they started filling. I was able to get a few stops in and then it stopped filling. Took pictures of it on the way home and once I got home. I'm guessing it needs a new compressor. Any ideas?

Thank you in advance for any help you can offer!!!
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Old 08-05-2015, 07:47 PM   #2
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air trouble

since the compressor works at times i think you have a pressure regulator or dryer problem the compressor wont fix it self so something is releasing the air or not holding it . Do you hear air hissing any where when you get pressure ? may be a problem with the tank drains also keep looking( and listening) you will find it Mike
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Old 08-05-2015, 07:51 PM   #3
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It's probably the regulator. Happens every so often on some of our 18 wheelers. It's a $20 part.
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Old 08-05-2015, 07:58 PM   #4
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In 35 years I only saw 3 or 4 compressors go bad and 2 were splines stripping. Have you had your air dryer serviced in the last 2 or 3 years? I would look there first. They do cause what you are experiencing.


If you are handy you could jump out the dryer and see if it works without it. Just hook the 2 big hoses together. Leave the small one on or cap it.
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Old 08-05-2015, 09:56 PM   #5
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We had a problem on the way to Alaska where we got the low air warning horn and pressures started down. Found the purge valve at the bottom of the air drier was at first leaking intermittently, and finally would not hold air at all. We continued 500+ miles to destination by putting a 1/2" pipe thread plug in it. Tiffin said it could be used as long as air tanks were drained daily and we did not take the rig into freezing temps. They mailed me a new purge valve and it took me about 2 minutes to replace the plug with it.
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Old 08-05-2015, 10:18 PM   #6
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As other members have said most likely an air dryer or compressor governor problem rather than a complete compressor.
Here is a file on dryer maintenance that covers two common types.
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Old 08-05-2015, 10:40 PM   #7
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Sounds like it's time for some air dryer maintenance. At the same time, check your compressor governor, it may be sticking and not completely closing off after the purge.

90 percent of the time the problem you described can be fixed by regular servicing of the mentioned components.
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Old 08-06-2015, 12:00 AM   #8
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Onecrazydman,
You've been given some pretty good advice here. Before you go emptying your wallet on a new compressor, yep, I'd take a look at:

1. The regulator, it controls all of what goes into the air system
2. The Air Dryer. It CLEANS all of what goes into the system
3. The Purge Valve. It controls the excess air that leaves the system

The purge valve is attached to the bottom side of the air dryer. It's not hard to remove and disassemble and check for debris or other matter that can possibly goof things up in there. Now, I really no nothing about the governor other than, logically, it "governs" the system. So, that might mean, it's miss-governing and not doing its job correctly, just a guess.

I just removed my air dryer and installed a new set of filters and what ever else that was supposed to go in there while it was out. That's also a fairly simple job too. I cannot see why folks let it go for so long without any maintenance. But, anyways, you've got some ideas on where to possibly start. Good luck.
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Old 08-06-2015, 09:57 PM   #9
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To Fire up and all readers,

The air compressor governor is the regulator of the air pressure.

Governor, in this case is just a play on names, and those who mention regulator are talking about the same thing.

Hope that makes it clear....

PS: I agree, simple (PM) in this case will be money saved by the op. Don't throw your vacation money away.
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Old 08-12-2015, 11:32 PM   #10
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A huge THANK YOU!!

Thank you everyone that posted to help me out. Turns out it was a sheared turbo valve and a wornout pressure relief valve should open at 175psi. 90psi of air and it was opening and dumping all my air. I have included the picture of the turbo valve.

Again thank you everyone that posted to help me out....and save me some money!!
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Old 08-13-2015, 10:25 AM   #11
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Look like dog bones.
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Old 08-15-2015, 08:43 AM   #12
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Well I'm confused,
I don't recognize these parts at all. Did they come out of your dryer assembly?
I haven't had the opportunity to disassemble the new spin on cartridge type.

And thanks for the update....
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Old 08-15-2015, 09:08 AM   #13
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Quote:
Originally Posted by Dtwallace View Post
Well I'm confused,
I don't recognize these parts at all. Did they come out of your dryer assembly?
I haven't had the opportunity to disassemble the new spin on cartridge type.

And thanks for the update....
I found this on a Bendix PDF. I suppose if it broke it would leak.



http://www.beamalarm.com/foretravel-...stallation.pdf












ISOLATION VALVE
(Turbo Cut-Off Valve)
Used with air dryers not equipped with
this feature. Allows use of air dryer
on turbo charged engines without
affecting engine performance.
Installs directly (1/2"-14 NPTF) to air
line inlet port of air dryer.
Part No. KN23500
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Old 02-06-2016, 02:17 AM   #14
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Yes they came out of my drier. It's call a slave piston.
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air breaks, compressor, dryer problem, turbo valve



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