KW T680 Compressor problem

Discussion in 'Trucks [ Eighteen Wheelers ]' started by moybutter, Jun 16, 2024.

  1. moybutter

    moybutter Bobtail Member

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    Ok I had a compressor discharge line replaced a few weeks ago.
    Today I just started driving, I saw transmission low pressure low alarms. I pulled over to the shoulder and I noticed air coming out of a hole below the oil filter at the compressor.
    I've been idling for a little while and I am not building up air pressure above 100 psi; it is holding at 80 psi.
    What do you think that the problem is? Thank you.
     
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  3. moybutter

    moybutter Bobtail Member

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    Jul 16, 2018
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    Now this is weird. I observed my pressure build up to normal 125 psi after a while, air was no longer leaking at the bottom of the compressor oil filter.
    I released and set both of my brakes a few times and observed the pressure build back up.
    I got curious I released and set my brakes a few times again but I drove slowly back and forth on the shoulder of the road to observe the compressor build the pressure back up and it did so quicker.
    Everything appears normal now??
     
  4. Lyle H

    Lyle H Road Train Member

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    When you say compressor oil filter do you mean the air dryer?
    The purge valve may have stuck open once and now has come unstuck and operating normally.
     
    Last edited: Jun 16, 2024
  5. moybutter

    moybutter Bobtail Member

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    Jul 16, 2018
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    Yes I confirmed that it is the air dryer. I read oil on the label somewhere earlier.
     
  6. moybutter

    moybutter Bobtail Member

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    Jul 16, 2018
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    The problem was the purge valve. The first ship I went to tested it out and didn't see a problem with the valve. Then the same issue happened the next day when I was driving; got the purge valve replaced now everything is ok
     
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