Air pressure goes up to 140

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Shawn19, Jun 3, 2020.

  1. Shawn19

    Shawn19 Light Load Member

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    Apr 20, 2019
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    I have a 2005 Columbia my air pressure goes up to 140 how do i ajust it to 125 i replace it with a new air governor that said it pre set to 125 still goes to 140 the governor is not adjustable anyone know?
     
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  3. uncleal13

    uncleal13 Road Train Member

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    Most governors are adjustable. Screw off or pull black plastic cap, back off locking nut, turn set screw counter clockwise to lower pressure.
     
  4. Shawn19

    Shawn19 Light Load Member

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    This one doesn't have a adjustable governor i know what a adjustable governor is i adjust air pressure before on my previous truck.
     
  5. kemosabi49

    kemosabi49 Trucker Forum STAFF Staff Member

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    If it is not adjustable, then you could buy one that is adjustable and adjust it.
     
    AModelCat and baha Thank this.
  6. mslashbar

    mslashbar Medium Load Member

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    elizabeth,co
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    Maybe it's not actually the governor that's bad, maybe your gauge is reading wrong.
     
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  7. SmallPackage

    SmallPackage Road Train Member

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    I was gonna say that but when someone brings up that possibility others tend to dismiss it as impossible to happen. Lol! We old timers know gauges don’t ever lie. Lol!
     
    clausland and AModelCat Thank this.
  8. AModelCat

    AModelCat Road Train Member

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    Could be a blocked up signal line or port from the tank, a gunked up and sticking unloader piston, gauge not working properly etc.
     
  9. Frontman

    Frontman Light Load Member

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    What's wrong with 140?
     
  10. baha

    baha Road Train Member

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    The Anti/lock brake sys.. needs more air to work like it should, so most of the new air reg. are set hi to make newer trucks brake sys. work, so you can run it the way it is.
     
  11. Shawn19

    Shawn19 Light Load Member

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    Apr 20, 2019
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    It not the gauge had the dash cluster replace an it reading the same it an older truck 2006 i drove 3 other Columbia like this one an they all run at 125
     
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