wobbling when driving Tri axle

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by SA1, Jun 25, 2021.

  1. SA1

    SA1 Bobtail Member

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    Jul 25, 2019
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    Hi guys/gals
    my 2014 Tri dive kenworth is wobbling when I drive and the faster I go the more it wobbles.I noticed the first rear axle has started to get an uneven tire wear. I’m change out the shocks on the rear front and middle axles.This is my first truck so I want to do the most I can myself. Don’t want to be down a whole day either. Shocks look simple two bolts anything I should know? any other problems I should keep an eye for other then the shocks?

    thanks I’m advance eveyone
     
    Last edited: Jun 25, 2021
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  3. baha

    baha Road Train Member

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    -Get a 10 or 15 ton bottle jack and and tire changing bar, then jack up each side with big blocks of wood for tire chocks on each side of tire on other side that your jacking on and use the long bar to ck. for lose wheel bearings for any play at all with brakes released that can make the outside edges of drive tires wear funny ridges, look at the arms that hold axles in line that have rubber bushing inside them that should look solid all the way around and can make axles act like that if they are worn ? CK the ft. end steering box arm for any play by turning the shaft with motor running and ck. both tie rod ends for any play, then jack up each FT. side and ck. for any wheel bearing play?
     
    Last edited: Jun 25, 2021
    BoxCarKidd, Dino soar and Don379 Thank this.
  4. Don379

    Don379 Medium Load Member

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    Jan 7, 2021
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    That about covers it where to start
     
  5. Happily Retired

    Happily Retired Road Train Member

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    high plains colorado
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    Not the shocks, is the 1st axle an air tag? I doubt you have 3 drive axles, it may be a downward pressure thing, or not enough. If it's a drive axle, the list is long. U-joints, bearings, engine mounts, harmonic balancer, tire with a bad cord. If it is a tag, I'd look at the tires 1st. An old rule of thumb, if the shaking is in the steering wheel, it's up front, if it shakes the seat, it's probably a driveline issue.
     
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