adjusting air govenor

Discussion in 'Trucks [ Eighteen Wheelers ]' started by gunner76, Aug 30, 2011.

  1. gunner76

    gunner76 Medium Load Member

    Mar 11, 2010
    My air govenor shuts the compressor down at 120psi and I would like to get that up to around 130-135psi and can't remember which way the adjustment screw needs to be turned to increase pressure.
    Puddlestomper52 Thanks this.
  2. Starline

    Starline Medium Load Member

    Jun 1, 2011
    Middle Tn
    I would imagine clockwise... its not hard to brake a few times to deplete your air to kick in the compressor to test the setting. Your better off to adjust a little bit at a time so not to blow something.
  3. bender

    bender Road Train Member

    Jul 20, 2010
    Don't Kid Yourself
    Turning the adjustment screw counter clockwise puts more load on the air governor spring and raises the cutout pressure setting. You may want to consider that raising the pressure setting can contribute to air leak problems.
  4. 07-379Pete

    07-379Pete Crusty Commando-Pete

    Oct 3, 2008
    Campbellsville, Ky
    Less trouble to find and fix.:biggrin_2559:
    Mine cuts out at around 135psi. Counter clockwise is the right way to raise the cut off pressure.
    insertnamehere and SHC Thank this.
  5. Pablo-UA

    Pablo-UA Road Train Member

    Oct 11, 2010
    Borispol, Ukraine
    governor ajustment depend on truck maker recomendations. On Mercedes it is 10 BAR, on MAN - on some trucks governor is ajusted to 12 BAR, but in air susopention tank, and 10 bar in brake tanks...

    On US trucks - generally 135 ore 150 PSI.
  6. Heavyd

    Heavyd Road Train Member

    Feb 4, 2009
    Turn it out to increase. Do it about a 1/4 turn at a time and test it.
  7. rollin coal

    rollin coal Road Train Member

    Mar 29, 2008
    My truck has always been at 120 psi. Is that not high enough? I thought thats what its supposed to be why 135?
  8. KW Parts Guy

    KW Parts Guy Light Load Member

    Jul 16, 2011
    On all new KW with the air drier mounted governor, they are pre set at 135 and are not adjustable.
  9. 07-379Pete

    07-379Pete Crusty Commando-Pete

    Oct 3, 2008
    Campbellsville, Ky
    Its adjustable after the OEM one takes a crap and a over the counter one is put one.:biggrin_25525:
  10. dave26027

    dave26027 Road Train Member

    Sep 10, 2009
    Dallas, Texas
    When you need 110 psi to air up your tires and your air system maxes out at 115 or 120 psi, it goes really slow. At some point the pressure in your tanks will be less than, or even with the pressure of the tire you're airing up and it's not low enough to kick in the air governor. So you have to bleed off your air system until the governor kicks in and builds up pressure.

    When you raise the pressure in the system, there's more air available above 110 psi, it's easier to adjust tire pressure. (And the pneumatic grease gun works better).

    130 lbs works good for me.
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