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Air Pressure Governor?

Discussion in 'Questions From New Drivers' started by STransport, Dec 22, 2015.

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  1. Dec 22, 2015 #1
    STransport

    STransport Light Load Member

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    Oct 13, 2014
    Hudson Valley, NY
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    I drive a leased Freightliner Ryder truck and have noticed for a long time that the air pressure governor fills the primary air tank between 140psi to 150psi. When I dropped it off at Ryder the other day for its PM service, I reported this issue. However, when I picked it up it was unchanged and the Tech said it was faulty and need to be replaced as it should not fill that high and would not pass DOT inspection. So a few days later I go back and it is still the same... I go inside to the office and another Tech said he replaced it and it was set to 145psi and the tanks can take 180psi. I really don't think they replaced it, but shouldn't it be set to 125psi?

    Is this something to worry about?
    Is this something I could receive a ticket for?
    Would it really not pass a DOT Inspection (Level1)?
     
    Last edited: Dec 22, 2015
    STransport, Dec 22, 2015
    STransport, Dec 22, 2015
    #1
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  3. Dec 22, 2015 #2
    Toomanybikes

    Toomanybikes Road Train Member

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    I think you are right on all counts.

    The tanks should survive at over 180psi but the pressure safety relief valve is set a 150psi. If your air governor is 'set' at 145psi you are awful close to tripping the safety relief valve at 150psi. The safety relief valve has the habit of duping all the air in the tanks before allowing pressure to rebuild again. That of course is not a good situation.

    I don't know how your mechanic determined the governor is set '145' without putting a gauge on it and running it. I don't know why you would set it that high if they took the effort to check it in the first place. Too much risk setting off the safety valve with that high pressure. It all sounds like mechanic BS to me.

    http://www.easternmarine.com/tech-info/how-air-brakes-work
     
    Toomanybikes, Dec 22, 2015
    Toomanybikes, Dec 22, 2015
    #2
  4. Dec 22, 2015 #3
    RustyBolt

    RustyBolt Road Train Member

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    Bement, IL
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    Most new regulators are set around 145 (what I was told by Dealer) when I questioned it. The newer trucks operate at a higher PSI. This increase should not affect your system at all. Mine is set pretty much right at 145. No issues.
     
    RustyBolt, Dec 22, 2015
    RustyBolt, Dec 22, 2015
    #3
  5. Dec 22, 2015 #4
    mountaingote

    mountaingote Road Train Member

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    All 145 psi vs. 125psi means is you have more air volume to work with before running low. Won't hurt anything
     
    mountaingote, Dec 22, 2015
    mountaingote, Dec 22, 2015
    #4
  7. Dec 22, 2015 #5
    STransport

    STransport Light Load Member

    95
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    Oct 13, 2014
    Hudson Valley, NY
    0
    I never have had a problem and hear the cut off sound (air release) at around 145psi.
    Just want to know if this could cause me to fail a DOT inspection (Air Brake Test) or get a ticket?
     
    STransport, Dec 22, 2015
    STransport, Dec 22, 2015
    #5
  8. Dec 22, 2015 #6
    mountaingote

    mountaingote Road Train Member

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    They don't care how much air you have as long as there's enough to check the brakes, then pump it down to test the low air warning
     
    mountaingote, Dec 22, 2015
    mountaingote, Dec 22, 2015
    #6
    Bob Dobalina Thanks this.
  9. Dec 23, 2015 #7
    HotH2o

    HotH2o Road Train Member

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    In all of my DOT inspections I've never had anyone look at my gauges.
     
    HotH2o, Dec 23, 2015
    HotH2o, Dec 23, 2015
    #7
  10. Dec 23, 2015 #8
    DustyRoad

    DustyRoad Road Train Member

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    The cutout has been 125 psi has been standard for years....now 145 is OK? I do question it because auxiliary OEM parts may not handle the 145 psi if not designed for it....ie valves and seals....just my 2 cents!
     
    DustyRoad, Dec 23, 2015
    DustyRoad, Dec 23, 2015
    #8
  11. Dec 23, 2015 #9
    DustyRoad

    DustyRoad Road Train Member

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    Then they was giving you a break, DOT checked my brakes and was listening for the alarm .... .. .. .. .. .at 60 psi. when he was staring at my gauges. Good buddy...LOL!
     
    DustyRoad, Dec 23, 2015
    DustyRoad, Dec 23, 2015
    #9
    double yellow Thanks this.
  12. Dec 24, 2015 #10
    TripleSix

    TripleSix God of Roads

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    On the top of the air governor is a black cap. Remove the cap. Theres a nut on a bolt with a slot in it. Loosen the nut.

    Bleed the air down by pumping the brakes quickly. When the air pressure builds to where you want it to bleed off, turn off the engine. Take a flathead screwdriver and turn that slotted bolt clockwise until you hear the dryer pop off. Retighten the nut and put the cap back on.
     
    TripleSix, Dec 24, 2015
    TripleSix, Dec 24, 2015
    #10
    Straight Stacks Thanks this.
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