Loosing air pressure when engine is running.

Discussion in 'Ask An Owner Operator' started by Aaag, May 17, 2024.

  1. Aaag

    Aaag Bobtail Member

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    May 17, 2024
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    I have freightliner cascadia 2015 truck is parking .engine is running. slow air built 5 minutes to purge. Start loosing air and purge cycling every 1 minute. When shutting of the engine its hold the pressure. no stattic air leak .for fan cluch I have swith to cut off the air . No change.replaced new air compressor new discharge hoses new tank new air dryer and governor. On gagues the secondary gague start loosing air. Truck is parking and running no brake no transmission engaged.
     
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  3. ElmerFudpucker

    ElmerFudpucker Medium Load Member

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    Sounds like you have an air leak.
     
    shatteredsquare Thanks this.
  4. Aaag

    Aaag Bobtail Member

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    I have ultra sound device for air leak checking .used while engine is off no air leak .
     
    silverspur Thanks this.
  5. Pepper24

    Pepper24 Road Train Member

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    Doesn’t sound like a leak more like a faulty governor or even the compressor it self.It’s been a long time I don’t remember exactly but there’s a needle on top of the one I had that will screw out and replace it that was on a cat I’m sure yours is different if it’s the governor you just replace it.
     
    bryan21384 Thanks this.
  6. Aaag

    Aaag Bobtail Member

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    Tomorrow I'll disconnect every hose connected to secondary tank an block it from tank . One by one .and see if I have leak or not.
     
  7. abyliks

    abyliks Road Train Member

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    Leak soap is still the best way to go

    check the lines coming out of the compressor
     
  8. Aaag

    Aaag Bobtail Member

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    New discharge line replaced from air compressor to air dryer.
     
  9. FLHT

    FLHT Road Train Member

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    The discharge hose from compressor to air tank tend to plug up over time.
    Make sure you use the right hose .
     
  10. 201773

    201773 Medium Load Member

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    I had the same problem with a 2019 Cascadia. Turned out to be a leaky air bag.
     
    silverspur Thanks this.
  11. Kenworth6969

    Kenworth6969 Road Train Member

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    Near 10 year old Crapcadia is on its last legs
     
    silverspur Thanks this.
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