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Old 02-02-2022, 07:03 AM   #197
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Trying!
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Old 02-02-2022, 09:25 AM   #198
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Another strange set of symptoms:
The dryer purge has stopped happening, and 15 minutes after shut down a relief valve blows underneath
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Old 02-02-2022, 09:52 AM   #199
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Strange happenings! I sure hope you get a good mechanic working on it.

We're pulling for you.
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Old 02-02-2022, 10:09 AM   #200
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In the words of the Grateful Dead, what a long strange trip it's been. Wish I could be some help but I just don't know anything about air suspension, but from what I've seen I need to learn my coach has air suspension in the rear but no air leveling so I assume it's not quite so complicated. Good luck.
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Old 02-02-2022, 10:25 AM   #201
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Quote:
Originally Posted by Roland Trombley View Post
Another strange set of symptoms:
The dryer purge has stopped happening, and 15 minutes after shut down a relief valve blows underneath
You have already had the air dryer and governor replaced?
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Old 02-02-2022, 11:35 AM   #202
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Read entire post and my guess is the dump valve has the same debris in it as the check valve. Until all the debris is cleaned from the system it will be unreliable IMO.
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Old 02-02-2022, 01:29 PM   #203
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You have already had the air dryer and governor replaced?
Yes
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Old 02-02-2022, 05:45 PM   #204
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Freightliner says it needs a compressor, but can't give me a delivery date. It may take 2 months.
So we are leaving it here and going in my car to rent a cabin at Pine Island KOA tomorrow while we wait for parts.
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Old 02-02-2022, 06:02 PM   #205
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I said in a previous post on this forum that I had never heard of a compressor working sometimes and the not working. Now it is beginning to sound like something let loose in the compressor and has contaminated the system. That would explain the working then not working. I would ask the service manager to make sure the system was flushed thoroughly before installing the new compressor.
I still don’t see how the contaminates got past the dryer, unless the shredded the desiccant.
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Old 02-07-2022, 06:48 PM   #206
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OP .....you get things figured out?
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Old 02-08-2022, 06:15 AM   #207
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OP .....you get things figured out?
I took it to Four Star Freightliner last week.
They were very courteous and eager to help me.
We camped their parking overnight and the next day a tech asked me about all the air related probems thar we were having. He originally suspected an issue with a check valve. He spent 3 hours under the coach, checking things in front and in back. I saw that he bypassed the new dryer at one point. He also connected shop air to it a couple of different ways.
After he had run it for awhile it would fail to build pressure. It even got to a point where he could hold his thumb over the output hose directly from the compressor.
Finally, his assessment was that either the compressor reed valve or unloader are causing the problem. I asked if there was evidence of any debris in the system and he said no, that any debris from the fibrous component that failed in the original dryer would have been caught by the filter. I remember that when the mobile tech temporarily removed one of the water drain valves the screen on it was shiny and clean as new.
Unfortunately Freightliner has no idea when they will be able to get a new compressor. They have it on order, but said that it may take as long as 2 months to get here. My motorhome is now sitting in their lot awaiting parts. The new compressor, installed, is going to cost $7200, and I had already spent $3000 on the air dryer and diagnostics before I took it to Freightliner.
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Old 02-08-2022, 06:46 AM   #208
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Wondering why you couldn't get a new head for the compressor with new reeds. But then I suppose that by now you want a complete and final solution.
I used to maintain about ten Ingersoll-Rand PRE2 type Compressors for a Tier 1 automotive supplier to the Big Three. The pistons were 21 and 36 inches in diameter with an 18 inch throw. The Reed valves in these babies were made up of what we called "Springs and Channels. Just one compressor could produce 1/2 cubic mile of air in a minute. The 500 HP open frame Synchronous motors turned over at 180 to 225 RPM.
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Old 02-08-2022, 07:46 AM   #209
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Iíve been following along from the beginning. This is certainly not what I expected. I surely do feel your pain. The interrupted vacation, repeated failed repair efforts, cost, wait. All so unbelievable. Sounds like the current mechanic was thorough and hopefully this time it will be dependable. Iím aghast at the cost though.
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Old 02-08-2022, 08:06 AM   #210
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Wondering why you couldn't get a new head for the compressor with new reeds. But then I suppose that by now you want a complete and final solution.
I agree, but I have been told several times now that those parts are no longer available.
I am somewhat familiar with the way these work, since I rebuilt a couple of 50 ton refrigeration compressors many years ago, but have no experience with these compressed air systems.
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