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T600 , jumping up and down going 65 mph

Discussion in 'Kenworth Forum' started by Jakebanman, Sep 23, 2019.

  1. Sep 23, 2019 #1
    Jakebanman

    Jakebanman Bobtail Member

    2
    1
    Sep 23, 2019
    0
    Truck jumps up and down going speed limit, have new U joints, new carrier bearing, new drive tires, new shocks tried several different steer tires! At my whits end with this thing! It feels like it's coming from the front of the truck but I cant find anything loose. Any advice be appreciated
     
    Jakebanman, Sep 23, 2019
    Jakebanman, Sep 23, 2019
    #1
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  3. Sep 23, 2019 #2
    Lyle H

    Lyle H Road Train Member

    1,194
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    Apr 16, 2014
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    You can either keep throwing parts at it or make one phone call to Mike Beckett at MD Alignment.
     
    Lyle H, Sep 23, 2019
    Lyle H, Sep 23, 2019
    #2
  4. Sep 23, 2019 #3
    Luke4780

    Luke4780 Bobtail Member

    4
    0
    Sep 23, 2019
    0
    back side of rims clean? Seen it before to where there was so much brake dust caked that it would cause a heck of a vibration.
     
    Luke4780, Sep 23, 2019
    Luke4780, Sep 23, 2019
    #3
  5. Sep 23, 2019 #4
    x1Heavy

    x1Heavy Road Train Member

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    Mar 5, 2016
    White County, Arkansas
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    Did you CAT the rig and see where your weights are?

    In certain situations she will buck on you.
     
    x1Heavy, Sep 23, 2019
    x1Heavy, Sep 23, 2019
    #4
  7. Sep 23, 2019 #5
    speedyk

    speedyk Road Train Member

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    Apr 8, 2015
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    Cab leveling valve.
     
    speedyk, Sep 23, 2019
    speedyk, Sep 23, 2019
    #5
  8. Sep 23, 2019 #6
    Jakebanman

    Jakebanman Bobtail Member

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    Sep 23, 2019
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    Replaced that too along with cab mounts
     
    Jakebanman, Sep 23, 2019
    Jakebanman, Sep 23, 2019
    #6
    speedyk Thanks this.
  9. Oct 7, 2019 #7
    mitchtazz

    mitchtazz Road Train Member

    1,826
    502
    Sep 6, 2009
    Lake Wales, Fl
    0
    I don't understand the "jumps up and down".

    Is it a really bad vibration, or is it just an unnecessarily rough ride when it shouldn't be E.I you hit a small bump, and the truck tries to throw you to the floor?
     
    mitchtazz, Oct 7, 2019
    mitchtazz, Oct 7, 2019
    #7
  10. Oct 14, 2019 #8
    starmac

    starmac Road Train Member

    6,642
    12,524
    Apr 11, 2019
    Fairbanks Ak
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    Jack up one wheel at a time and turn it by hand, then see if it moves back by itself, if it feels like a steer, I would start with them.
    It could be a brake hub out of balance, tire out of round, or even not properly mounted.
    While you are checking the steers, check the kingpins and bearings.
     
    starmac, Oct 14, 2019
    starmac, Oct 14, 2019
    #8
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