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Ive searched the forums....Unloader valve.

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by nikmirbre, Jan 21, 2020.

Page 1 of 4
  1. Jan 21, 2020 #1
    nikmirbre

    nikmirbre Road Train Member

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    Ive got a Bendix air compressor on a Detroit 12.7. All the videos I watch tell me to look for 3 screws on top of the compressor for the unloader valve..... Im not seeing it? Is the unloader valve this....pic coming up....

    And to replace it is it just a screw off screw on kinda deal? I assume after letting all the air out of the system first.....
     
    nikmirbre, Jan 21, 2020
    nikmirbre, Jan 21, 2020
    #1
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  3. Jan 21, 2020 #2
    nikmirbre

    nikmirbre Road Train Member

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    D257FE3A-324A-4D2F-95E9-529AA897757E.jpeg
     
    nikmirbre, Jan 21, 2020
    nikmirbre, Jan 21, 2020
    #2
  4. Jan 21, 2020 #3
    062

    062 Road Train Member

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    That’s the pop off valve. It’s to keep the pressure from getting to high.
    Unloader is to put air in tanks.
    What problem are you having?
     
    062, Jan 21, 2020
    062, Jan 21, 2020
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  5. Jan 21, 2020 #4
    nikmirbre

    nikmirbre Road Train Member

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    Right before the air dryer spits at 125 psi.... I can hear air leaking from somewhere. I cannot tell exactly where its coming from. Or ill hear kinda do 3 lil spits.... like tsss tsss tsss..... its hard to explain LOL. I watched a couple bendix videos on YouTube, maybe I'm not using the correct terminology. Back a few months ago I did have to go stick a small screwdriver to get the purge valve unstuck one very cold morning. Other than than no issues.
     
    nikmirbre, Jan 21, 2020
    nikmirbre, Jan 21, 2020
    #4
  7. Jan 21, 2020 #5
    062

    062 Road Train Member

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    062, Jan 21, 2020
    062, Jan 21, 2020
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    nikmirbre Thanks this.
  8. Jan 21, 2020 #6
    mhyn

    mhyn Road Train Member

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    mhyn, Jan 21, 2020
    mhyn, Jan 21, 2020
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    nikmirbre Thanks this.
  9. Jan 21, 2020 #7
    nikmirbre

    nikmirbre Road Train Member

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    @mhyn. Thats a lot of reading but at least I have something to reference to!!! Thank you!
     
    nikmirbre, Jan 21, 2020
    nikmirbre, Jan 21, 2020
    #7
    mhyn Thanks this.
  10. Jan 21, 2020 #8
    Hulld

    Hulld Road Train Member

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    82B7272C-2388-4840-8218-AE79E498CD6F.jpeg
    the two oval plates held in with two screws a piece is where you will find the unloaded valves
     
    Hulld, Jan 21, 2020
    Hulld, Jan 21, 2020
    #8
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  11. Jan 21, 2020 #9
    Hulld

    Hulld Road Train Member

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    From your picture it looks like they could be hidden under the hoses...
     
    Hulld, Jan 21, 2020
    Hulld, Jan 21, 2020
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  12. Jan 21, 2020 #10
    DougA

    DougA Road Train Member

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    Unloader valve or valves,depending on compressor are in the compressor head. They are spring loaded valves,that open and close on signal from the air governor. When compressed air isn't needed they open and the compressor does not build pressure.
     
    DougA, Jan 21, 2020
    DougA, Jan 21, 2020
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