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Rough riding suspension

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by lciambotti1, Sep 23, 2019.

  1. Sep 23, 2019 #1
    lciambotti1

    lciambotti1 Light Load Member

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    Mar 6, 2015
    0
    We have a 2007 International 9400I. Truck suspension slams on almost every bump. Checked ride height, replaced 4 shocks back in July and rechecked yesterday. New cab air bags and shocks back in July. Air bags are all inflated. Driver says it slams so hard it knocked the microwave off the shelf. Any thoughts on where to go?
     
    lciambotti1, Sep 23, 2019
    lciambotti1, Sep 23, 2019
    #1
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  3. Sep 23, 2019 #2
    AModelCat

    AModelCat Road Train Member

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    Jul 7, 2015
    Canuckistan
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    Cab air suspension height good?
     
    AModelCat, Sep 23, 2019
    AModelCat, Sep 23, 2019
    #2
  4. Sep 23, 2019 #3
    lciambotti1

    lciambotti1 Light Load Member

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    Mar 6, 2015
    0
    Yep. Checked that as well, and even followed him over to pick up the trailer.
     
    lciambotti1, Sep 23, 2019
    lciambotti1, Sep 23, 2019
    #3
  5. Sep 24, 2019 #4
    x1Heavy

    x1Heavy Road Train Member

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    White County, Arkansas
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    Slams so hard on what? and where and how fast?

    There are some bridges that are bad and capable of this "Slam" you speak of. Throw a mini strap over the microwave and don't go so fast over that spot that slammed the truck.
     
    x1Heavy, Sep 24, 2019
    x1Heavy, Sep 24, 2019
    #4
  7. Sep 24, 2019 #5
    Working2party

    Working2party Medium Load Member

    608
    729
    Feb 10, 2018
    Kansas
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    Not sure about your international. But if I was in your position I would start check omg bushings and mounts. It doesn’t take much slack in a cab mount to make the shocks ineffective.
     
    Working2party, Sep 24, 2019
    Working2party, Sep 24, 2019
    #5
    Art Vandelay Thanks this.
  9. Sep 25, 2019 #5
    Rideandrepair

    Rideandrepair Road Train Member

    17,260
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    Aug 8, 2015
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    Airbags inflated? That’s always a good thing. Did you set both suspension and cab heights to spec? Got to be at correct heights. Next, as mentioned Cab bushings and rear spring bushings
     
    Rideandrepair, Sep 25, 2019
    Rideandrepair, Sep 25, 2019
    #5
  10. Sep 25, 2019 #6
    Lazer

    Lazer Road Train Member

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    Jan 22, 2017
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    it could be any number of things.
    tire inflation
    fifth wheel position
    axles properly aligned
     
    Lazer, Sep 25, 2019
    Lazer, Sep 25, 2019
    #6
  11. Sep 25, 2019 #7
    starmac

    starmac Road Train Member

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    Apr 11, 2019
    Fairbanks Ak
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    Sounds like mine did when it needed new shocks on the cab or sleeper I guess. It got them the very next day when it bottomed out, that literally hurt.
     
    starmac, Sep 25, 2019
    starmac, Sep 25, 2019
    #7
    shatteredsquare Thanks this.
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