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No air coming from new tractor protection valve

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Kenny3521, May 22, 2025.

  1. May 22, 2025 #1
    Kenny3521

    Kenny3521 Bobtail Member

    1
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    May 22, 2025
    0
    So I’ve got an autocar yard dog and when applying the trailer air supply no air comes out the emergency glad hand. It was working previously with a new TPV and it also just got a new air dryer assembly as yearly service. I’m the last 30 days. MV-3 also seems to be working just fine knob pushes in and you can hear the air supply. I don’t have a diagram to see where there’s a valve between the two parts or if there’s something im missing
     
    Kenny3521, May 22, 2025
    Kenny3521, May 22, 2025
    #1
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  3. May 23, 2025 #2
    Joyce's Volvo

    Joyce's Volvo Light Load Member

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    Jun 28, 2016
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    See if you are getting air to the tpv, something may have happened to the valve. Also, a friend had a air dryer replaced and hooked lines up backwards, took couple hours to figure that out.
     
    Joyce's Volvo, May 23, 2025
    Joyce's Volvo, May 23, 2025
    #2
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