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No air pressure in secondary tank

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Lepton1, Aug 31, 2016.

Page 2 of 8
  1. Aug 31, 2016 #11
    Dave_in_AZ

    Dave_in_AZ Road Train Member

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    Please tell us what it was when its repaired.
     
    Dave_in_AZ, Aug 31, 2016
    Dave_in_AZ, Aug 31, 2016
    #11
    x1Heavy and Big Don Thank this.
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  3. Aug 31, 2016 #12
    AModelCat

    AModelCat Road Train Member

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    I bet its that two way check valve that feeds primary and secondary tanks from the wet tank. Either that or a blockage or kink in a line to the secondary tank.
     
    AModelCat, Aug 31, 2016
    AModelCat, Aug 31, 2016
    #12
    haycarter, Hammer166 and x1Heavy Thank this.
  4. Aug 31, 2016 #13
    Lepton1

    Lepton1 Road Train Member

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    The cavalry was called off when the mechanic told the owner how much his time was worth for a 900 mile round trip! I thought that was a bad idea.

    The owner had another mechanic call me. Had me take out the drainage plug on the secondary tank, run the engine, then bleed off the primary, put the plug back in, and then restart. Problem not resolved.

    Now the plan is to limp across the freeway to the International dealership and let them troubleshoot it. Likely won't be any need for replacement parts. No dealerships in this town are 24/7, so I need to wait till morning.

    I looked for a wet tank, but could not find it. The mechanic said that this make and model may have it inside the secondary? Now the trailer air bags and air ride seat are drained. All bad thoughts of driving this on the open road are gone completely.
     
    Lepton1, Aug 31, 2016
    Lepton1, Aug 31, 2016
    #13
    x1Heavy and Big Don Thank this.
  5. Aug 31, 2016 #14
    free spirited1

    free spirited1 Heavy Load Member

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    Get it to a dealer and count your blessings while your waiting in the driver lounge, hopefully not the motel!
     
    free spirited1, Aug 31, 2016
    free spirited1, Aug 31, 2016
    #14
    x1Heavy and Lepton1 Thank this.
  7. Aug 31, 2016 #15
    Lepton1

    Lepton1 Road Train Member

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    Yukon, OK
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    True THAT... but by this time I was expecting to be back in OKC, getting the truck washed and in the shop, and arranging a flight home to take a week off. That's delayed, but the sun will come up tomorrow.

    By the way, when I cranked up the truck this morning and the issue with the secondary tank presented itself, I noticed the air conditioning was blowing hot air. Is this related to the problem with the secondary tank? For example is the air dryer common to both systems?
     
    Lepton1, Aug 31, 2016
    Lepton1, Aug 31, 2016
    #15
    x1Heavy Thanks this.
  8. Sep 1, 2016 #16
    Chris50

    Chris50 Medium Load Member

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    My AC doesnt blow cold air if the low air warning buzzer is on after it sits for a while,slow leak.
     
    Chris50, Sep 1, 2016
    Chris50, Sep 1, 2016
    #16
    Lepton1 Thanks this.
  9. Sep 1, 2016 #17
    x1Heavy

    x1Heavy Road Train Member

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    White County, Arkansas
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    HM....

    I fix coffee and get back to you.

    You gotta pump air. If you gots air in all tanks then the problem is in the gauge. Possible? Bad gauge?

    I never had a air gauge fail in all my years on the road. Tanks spit gallons of gunk yes but never a tank pressure gauge...
     
    x1Heavy, Sep 1, 2016
    x1Heavy, Sep 1, 2016
    #17
  10. Sep 1, 2016 #18
    Hammer166

    Hammer166 Crusty Information Officer

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    As @NorthernMechanic pointed out, this is simple. There is a check valve that only lets air into the tanks from the wet tank. That's what is causing this. If it was the dryer he'd have no air in either tank.

    As for the a/c blowing hot, if that truck uses air to control the blend doors, then it's likely why it blows hot. Shut of the water valves feeding the heater core and it should blow cool.
     
    Hammer166, Sep 1, 2016
    Hammer166, Sep 1, 2016
    #18
    Lepton1, tucker and x1Heavy Thank this.
  11. Sep 1, 2016 #19
    haycarter

    haycarter Road Train Member

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    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

    Plus ONE to this Lot..
     
    haycarter, Sep 1, 2016
    haycarter, Sep 1, 2016
    #19
    Lepton1, lester and Hammer166 Thank this.
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