Compressor not cutting out

Discussion in 'Kenworth Forum' started by Perchie15, Dec 8, 2023.

  1. Perchie15

    Perchie15 Light Load Member

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    Aug 16, 2021
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    1996 kenworth has a 3460 engine cat in it. And air gauges wrap to 150 and keep building.
    I’ve changed the governor
    Changed both of the unloaders
    Replaced air dryer cartridge
    Also the air purge tank coming off air dryer cuz the tank was leaking! Not sure where else to go.
     
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  3. JB7

    JB7 Medium Load Member

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    Dec 13, 2022
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    What model dryer do you have? Check the line from the governor to the compressor. Also check the line from the governor and trace it to the air tank. The governor senses/reads the air pressure from the tank. When it reaches the set pressure of about 120-130 psi the governor then opens to the control line that goes from the governor to the compressor. The air pressure opens the unloader valve and air is not sent through the discharge line to the tanks.
     

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  4. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Have you checked the supply line to the governor? I would make certain that it's not blocked.

    Assuming your purge valve isn't popping off at normal pressure?
     
    Stay Puft Thanks this.
  5. SmallPackage

    SmallPackage Road Train Member

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    Have the gauges been checked for accuracy? Is the gov adjustable and was it dialed in? The proper plugs removed/ installed in the proper ports on replacement gov? Most systems should have a safety pop off valve on a tank somewhere that should release pressure around 150 psi. to keep a runaway compressor or bad gov from building dangerous levels.
    I’ve seen many air gauges be liars in many trucks. Had one recently that would build air to 125 and purge like supposed to but gauge would not rise past 90. Funny thing was it was balls on accurate to that point with the low air buzzer and knobs pop out point.
     
    Magoo1968 Thanks this.
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