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Thread: air suspension problems

  1. #1
    Join Date
    Jun 2020
    Location
    Rockhampton, central Queensland
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    air suspension problems

    Hi Folks,
    I have been having EAS problems of late. On the way home from a trip down South the air bags started going down. After a while I found a place to pull off the highway and bypass the the control system and inflated the air bags directly to get home. On investigation I found a loose air hose under the bonnet. Easy fixed, but then the air tank would not hold air. The air bags were fine. Just as soon as I turned the motor off the diaphragm would open and dump all the air in the tank. I pulled the valve block and checked every thing in there and it looked fine. I did read somewhere that the diaphragm is held closed by the air pressure held in the line from the compressor to the valve block. I did replace the little O ring under the reed valve. I fitted a gauge in the line from the compressor and the valve block and it was holding pressure, but when I put it back to the vehicle it would dump all the air from the tank. So I got a inline non return valve and put it in the line, and it still won't hold the tank pressure. So at that point I gave up and went to the shed to work on another project. I will try again tomorrow. Does anyone have any ideas of something that I am missing.
    Thanks for any advice you can give me, Regards, Alan

  2. #2
    Join Date
    Jan 2016
    Location
    Netherlands
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    880
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    Did you reconnect the driver pack?

    Those things can go wrong and perhaps it hold a valve open that dumps the air. Just thinking out loud here.

    -P

  3. #3
    Join Date
    Jun 2020
    Location
    Rockhampton, central Queensland
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    air suspension problems

    Hi Prelude, Thanks for your reply. When you are having air suspension problems all help is appreciated. I have checked the valve block and found the little metal cover that goes over the diaphragm is missing. I checked my 2 spare valve blocks and the metal covers are missing from them as well. So I spent the afternoon machining one up on the lathe. I will put it back on tomorrow and see if that fixes it. I am not very confident though, as the air suspension was working before and it just started playing up. But I am running out of ideas.
    Regards,
    Alan

  4. #4
    Join Date
    Jun 2020
    Location
    Rockhampton, central Queensland
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    131
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    air suspension problems

    Hi Folks, I have found a problem with one of the NRV, and apparently this could cause this cause the problem. I managed to find another valve block and it has fixed my problems. But I am going to fix my original valve block so I will have a spare.
    Regards, Alan

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