I finally remembered to ask this question about trucks or trailers that lift their axles

Discussion in 'Experienced Truckers' Advice' started by TruckRunner, Apr 16, 2018.

  1. TruckRunner

    TruckRunner Heavy Load Member

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    You usually see this with trucks that pull oversized loads. You will notice that they may have one of their axles lifted off the ground so the tires wont be used. I always wondered are they lift up by air or do you have to crank the axle up? I assume it's the same for trailers too?
     
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  3. Ridgeline

    Ridgeline Road Train Member

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    Air. Some lift axles are tied to the controls of the suspension, other lift axles have a manual setup that you put up or down,
     
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  4. Bad Monkey

    Bad Monkey Medium Load Member

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    There were some old school tags that were spring up and air down.
     
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  5. SteveScott

    SteveScott Road Train Member

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    I've been seeing them more often on new dry vans. I guess it saves wear on one set of tires and makes sharp turns easier?
     
  6. Ridgeline

    Ridgeline Road Train Member

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    Old school is right. I haven't seen those in years, like 30 years.
     
  7. Jazz1

    Jazz1 Road Train Member

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    We have lift control in cab for lifting forward axle on 4 legged,,,lifts fore and aft on 5 legged. You want to be able to lift forward axle when road gets slick or lighten pressure.
     
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  8. Long FLD

    Long FLD Road Train Member

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    I ran a spring up/air down until about 1999 because at that time they were lighter than the air/air axles that were available.
     
  9. jammer910Z

    jammer910Z Road Train Member

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    Also less rolling resistance for much better fuel mileage when lightly loaded.
     
  10. Hoofbeats

    Hoofbeats Road Train Member

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    They aren't needed when you're lightly loaded.
     
  11. DSK333

    DSK333 Road Train Member

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    They can save on the outrageous tolls all too many states like to impose on the transportation industry as well.
     
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