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Air Compressor Cycling Frequently

Discussion in 'Trucks [ Eighteen Wheelers ]' started by billandlori, Mar 3, 2012.

Page 1 of 2
  1. Mar 3, 2012 #1
    billandlori

    billandlori Medium Load Member

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    Sep 5, 2010
    Stratford, Ontario, Canada
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    My air compressor is cycling every 2-4 minutes while going down the road. More frequently when pulling a hill. The air compressor intake is from the pressure side of the turbo.

    No audible air leaks when truck is off, air stays up when truck off.

    Where should I start? Compressor Governor/Unloader, or compressor valves sticking? Air dryer?

    Thanks for the advice!

    Bill
     
    billandlori, Mar 3, 2012
    billandlori, Mar 3, 2012
    #1
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  3. Mar 3, 2012 #2
    truckmechanic

    truckmechanic Medium Load Member

    534
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    Jan 14, 2012
    Hi Desert Ca
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    Check the purge line from the air tank to the govner a lot of the time the line leaks and also the same for the air line from the fan selinoid to the fan hub and check the main air line to the compressor outlet spray them with soapy water it can also be the unloader or the air govner
     
    truckmechanic, Mar 3, 2012
    truckmechanic, Mar 3, 2012
    #2
    billandlori Thanks this.
  4. Mar 3, 2012 #3
    Hardlyevr

    Hardlyevr Road Train Member

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    Mapleton Depot,PA
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    you may want to check the wastegate actuator on your turbo too.
     
    Hardlyevr, Mar 3, 2012
    Hardlyevr, Mar 3, 2012
    #3
    billandlori Thanks this.
  5. Mar 3, 2012 #4
    fortycalglock

    fortycalglock Road Train Member

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    Jun 25, 2011
    Tourist Town, FL
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    Engine off, chock your wheels and release your brakes, and listen to rule out a bad brake chamber.
     
    fortycalglock, Mar 3, 2012
    fortycalglock, Mar 3, 2012
    #4
    billandlori Thanks this.
  7. Mar 3, 2012 #5
    HISPEED428

    HISPEED428 Light Load Member

    157
    21
    Mar 28, 2009
    Plum Coulee,MB
    0
    I'd change the governor on the compressor first, mine was doin the same thing and that fixed it.
     
    HISPEED428, Mar 3, 2012
    HISPEED428, Mar 3, 2012
    #5
  8. Mar 3, 2012 #6
    billandlori

    billandlori Medium Load Member

    357
    107
    Sep 5, 2010
    Stratford, Ontario, Canada
    0
    Thanks! It does it when I'm stopped and idling too, I've applied tractor and trailer parking brakes and dumped the suspension too and it still cycles the same.

    Bill
     
    billandlori, Mar 3, 2012
    billandlori, Mar 3, 2012
    #6
  9. Mar 3, 2012 #7
    billandlori

    billandlori Medium Load Member

    357
    107
    Sep 5, 2010
    Stratford, Ontario, Canada
    0
    Sounds good, I think I'll give that a try.

    Bill
     
    billandlori, Mar 3, 2012
    billandlori, Mar 3, 2012
    #7
  10. Mar 3, 2012 #8
    rollin coal

    rollin coal Road Train Member

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    Mar 29, 2008
    TN
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    Fan clutch could be leaking. I had this problem and it was leaky fan clutch. Wont leak with engine off. Unhook air line and pressurize it with shop air to check for leaks.
     
    rollin coal, Mar 3, 2012
    rollin coal, Mar 3, 2012
    #8
    billandlori Thanks this.
  11. Mar 3, 2012 #9
    Heavyd

    Heavyd Road Train Member

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    Feb 4, 2009
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    Unloaders in the compressor is the usual culprit.
     
    Heavyd, Mar 3, 2012
    Heavyd, Mar 3, 2012
    #9
  12. Mar 3, 2012 #10
    rollin coal

    rollin coal Road Train Member

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    Mar 29, 2008
    TN
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    One thing about fan clutch leaks, this will also cause your engine fan to run constantly with a CAT.. forgot about that when I was posting earlier
     
    rollin coal, Mar 3, 2012
    rollin coal, Mar 3, 2012
    #10
    NadeauTrucking Thanks this.
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