Cummins air compressor

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by me myself and I, Jul 3, 2022.

  1. me myself and I

    me myself and I Medium Load Member

    682
    284
    Oct 5, 2009
    vernon hills,Il
    0
    There is a 1/4in line coming from it. Where is it going to? It was leaking, I've fixed it, but now I have an air continuously leaking from air dryer. Can it be related?
     
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  3. uncleal13

    uncleal13 Road Train Member

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    5,545
    Apr 9, 2009
    Humboldt, Sk
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    Probably the line from the tank to the governor so it knows when to kick in and out the air compressor.
    If it has those cheap plastic push-to-connect fittings. Take them off an put on brass compression fittings, usually fixes it.
     
    AModelCat Thanks this.
  4. Goodysnap

    Goodysnap Road Train Member

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    Jul 12, 2017
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    Tis the unload line. When cut out pressure is reached the governor sends air to the compressor. Valves open and compressor stops building.
     
  5. me myself and I

    me myself and I Medium Load Member

    682
    284
    Oct 5, 2009
    vernon hills,Il
    0
    Well that's not my problem then. I'm leaking from unloaded valve. Can governor cause it, or is it a valve.
     
  6. Donmccord13

    Donmccord13 Bobtail Member

    8
    1
    Jul 5, 2022
    Georgia
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    The purge valve on the air dryer is probably toast the o-rings go bad and come apart and get stuck in the valve not letting it close completely new purge valve is like 30 bucks for the kit new o-rings lube and heater if it is an ad-9 system
     
  7. me myself and I

    me myself and I Medium Load Member

    682
    284
    Oct 5, 2009
    vernon hills,Il
    0
    I've just got one..122 bucks. 3 baggies of stuff. But the worst thing is probably have to flip dryer up side down to install it. And it got about 10 lines connected.
     
  8. Donmccord13

    Donmccord13 Bobtail Member

    8
    1
    Jul 5, 2022
    Georgia
    0
    Mine has 3 3/8 bolts holding the purge valve in the bottom of the dryer unscrew those take a small flat head gently pry out the old one make sure all the prongs come out they like to stick inside the air dryer housing assemble new purge valve lube up the o-rings on new one slide it back in place put bolts in and plug in the heater at least that’s how mine goes but my dryer is in a very accessible spot on my frame behind passenger steer tire on my cabover good luck man 122 bucks now oh how the world is changing
     
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