Lift axle PSI in tri axle Mack

Discussion in 'Tanker, Bulk and Dump Trucking Forum' started by wall_404, Apr 22, 2015.

  1. wall_404

    wall_404 Bobtail Member

    37
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    Apr 22, 2015
    Ontario, Canada
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    We run a 2005 tri axle Mack dump truck and I'm looking to settle a disagreement between driver's about what PSI the lift axle should be set at. The truck spends more time on the highway than off road.
    Thanks
     
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  3. 315wheelbase

    315wheelbase Heavy Load Member

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    Oct 26, 2014
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    a lift axle that has 4 tires should have the air pressure set so that it carriers the same weight as each drive axle,,when on a job site or place where a very tight turn is required the air on the lift should be dumped , remember when you dump the air on a lift all the weight will then be shifted to the drive axles and the steer,, for safety air pressure should be equalized so that the braking is effective on all axles,
     
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  4. wall_404

    wall_404 Bobtail Member

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    Apr 22, 2015
    Ontario, Canada
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    Thanks 315wheelbase!
     
  5. 4leggedbucket

    4leggedbucket Bobtail Member

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    Feb 4, 2015
    ontario, canada
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    Isn't there some sort of mathematical calculation for that? Like 1or 2 psi per pound of payload?
     
  6. 4leggedbucket

    4leggedbucket Bobtail Member

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    Feb 4, 2015
    ontario, canada
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    edit 1000 lbs of pay load
     
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  7. j_martell

    j_martell Light Load Member

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    Jun 12, 2014
    Centre Wellington, Ontario
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    depends on the axle. the path they follow means its not a linear PSI-ground pressure graph. I had a copy of the one for the Hendrickson Lift in the mack i used to drive. 50 PSI was 9000kg on the ground.
     
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