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Air leaks!!

Discussion in 'Ask An Owner Operator' started by The newb driver, Apr 13, 2020.

Page 1 of 2
  1. Apr 13, 2020 #1
    The newb driver

    The newb driver Bobtail Member

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    Mar 15, 2019
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    Hey guys I have a 05 vnl 780 and have changed the O rings on most fittings but still leaks and while the bags are full everything works good but if I shut it off within 30 minutes truck is on the ground is there a specific type of O ring or a way to upgrade fittings or whatever helps, please this is so frustrating and thank you
     
    The newb driver, Apr 13, 2020
    The newb driver, Apr 13, 2020
    #1
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  3. Apr 13, 2020 #2
    PE_T

    PE_T Road Train Member

    3,412
    3,789
    Jul 12, 2017
    Texas (trucking since 02/2013)
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    Use soapy water and spray the airline fittings for leaks. Start at the air tanks, and then follow the airlines.
     
    PE_T, Apr 13, 2020
    PE_T, Apr 13, 2020
    #2
    Klleetrucking, The newb driver and daf105paccar Thank this.
  4. Apr 13, 2020 #3
    daf105paccar

    daf105paccar Road Train Member

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    Apr 15, 2012
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    Are you shure it isn't the airbags leaking?
    Have you sprayed those?
     
    daf105paccar, Apr 13, 2020
    daf105paccar, Apr 13, 2020
    #3
    magoo68, The newb driver and PE_T Thank this.
  6. Apr 13, 2020 #5
    The newb driver

    The newb driver Bobtail Member

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    Mar 15, 2019
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    Yeah I sprayed them and they’re good
     
    The newb driver, Apr 13, 2020
    The newb driver, Apr 13, 2020
    #5
    daf105paccar and PE_T Thank this.
  8. Apr 13, 2020 #5
    The newb driver

    The newb driver Bobtail Member

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    Mar 15, 2019
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    I did that and I know what fittings are leaking but I’ve already replace the O rings but after a couple days they leak again
     
    The newb driver, Apr 13, 2020
    The newb driver, Apr 13, 2020
    #5
    daf105paccar and PE_T Thank this.
  9. Apr 13, 2020 #6
    boneebone

    boneebone Road Train Member

    2,297
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    Mar 13, 2009
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    If the fittings are leaking again, check that the replacement O-rings are the correct size.
     
    boneebone, Apr 13, 2020
    boneebone, Apr 13, 2020
    #6
    The newb driver and PE_T Thank this.
  10. Apr 13, 2020 #7
    Snailexpress

    Snailexpress Road Train Member

    2,675
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    Apr 28, 2014
    Rocky
    0
    Replace pressure protection manifold. It's plastic and will leak even with new o-rings.
     
    Snailexpress, Apr 13, 2020
    Snailexpress, Apr 13, 2020
    #7
    The newb driver and PE_T Thank this.
  11. Apr 13, 2020 #8
    PE_T

    PE_T Road Train Member

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    Jul 12, 2017
    Texas (trucking since 02/2013)
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    I’m not very familiar with o-ring fittings, but I would assume that you need to lubricate the o-rings. You also need to make sure you have the correct size and thickness for the o-rings.
     
    PE_T, Apr 13, 2020
    PE_T, Apr 13, 2020
    #8
    The newb driver Thanks this.
  12. Apr 13, 2020 #9
    The newb driver

    The newb driver Bobtail Member

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    Mar 15, 2019
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    Alright I will look into that thanks
     
    The newb driver, Apr 13, 2020
    The newb driver, Apr 13, 2020
    #9
    PE_T Thanks this.
  13. Apr 13, 2020 #10
    The newb driver

    The newb driver Bobtail Member

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    Mar 15, 2019
    0
    Lubricate with what and yeah the size are right but you’re probably right on the thickness I’ll look into it thanks
     
    The newb driver, Apr 13, 2020
    The newb driver, Apr 13, 2020
    #10
    PE_T Thanks this.
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