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2012 Peterbilt 386 - Steering Wheel Jerking Back and Forth Violently

Discussion in 'Trucks [ Eighteen Wheelers ]' started by samjward, Mar 9, 2017.

Page 1 of 2
  1. Mar 9, 2017 #1
    samjward

    samjward Light Load Member

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    May 20, 2016
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    Hey everyone,

    I'm in desperate need of help at the moment. I've had this truck in a few different shops to no avail. At slower speeds the whole trucks rocks violently back and forth, you can feel it in the seat and the steering wheel physically moves back and forth extremely violently. It seems to come and go. Usually comes at slow speeds though. We've had kingpins checked, bearings checked, wheels checked for out of round. Nothing. Everything seems fine. A passing truck driver has mentioned to my driver that the tires were bouncing back and forth. Looked like death wobble. What should we be checking for? We need this fixed ASAP, it feels like the truck is coming apart. :(
     
    samjward, Mar 9, 2017
    samjward, Mar 9, 2017
    #1
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  3. Mar 9, 2017 #2
    boneebone

    boneebone Road Train Member

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    Did you replace the steer tires or have them balanced?

    Check the drag link or tie rod.
     
    boneebone, Mar 9, 2017
    boneebone, Mar 9, 2017
    #2
  4. Mar 9, 2017 #3
    samjward

    samjward Light Load Member

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    May 20, 2016
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    The steer tires were replaced awhile back, and have been verified that they're okay. As for balancing, just had them re-balanced yesterday. Problem is still occurring. :(

    Tie rods look good and have been checked by 4 different mechanics.
     
    samjward, Mar 9, 2017
    samjward, Mar 9, 2017
    #3
  5. Mar 9, 2017 #4
    boneebone

    boneebone Road Train Member

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    To me it seems like a tire problem as it only happens at certain RPM's and then it disapates.

    You check your U-Joints or Center Bearing Hanger?
     
    boneebone, Mar 9, 2017
    boneebone, Mar 9, 2017
    #4
  7. Mar 9, 2017 #5
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Aug 26, 2014
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    I had a similar problem once, usually happened in conjunction with rough roads. My problem was the internal balance product in the steer tires. I did not ask for it and it was not on the bill.
     
    BoxCarKidd, Mar 9, 2017
    BoxCarKidd, Mar 9, 2017
    #5
  8. Mar 9, 2017 #6
    little cat 500

    little cat 500 Road Train Member

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    Jan 17, 2010
    Abbottstown PA
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    mine did that when the kingpins were bad
     
    little cat 500, Mar 9, 2017
    little cat 500, Mar 9, 2017
    #6
  9. Mar 9, 2017 #7
    Brandt

    Brandt Road Train Member

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    Brandt, Mar 9, 2017
    Brandt, Mar 9, 2017
    #7
  10. Mar 9, 2017 #8
    Brandt

    Brandt Road Train Member

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    Brandt, Mar 9, 2017
    Brandt, Mar 9, 2017
    #8
  11. Mar 9, 2017 #9
    AModelCat

    AModelCat Road Train Member

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    Canuckistan
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    -Check caster
    -Check for loose u-bolts
    -Check for broken center bolts in front springs
    -Check spring pin bushings
    -Check kingpins
    -Check tie rods, drag link and steering box
     
    AModelCat, Mar 9, 2017
    AModelCat, Mar 9, 2017
    #9
  12. Mar 9, 2017 #10
    Brandt

    Brandt Road Train Member

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    Could be rims not centered on the hub
     
    Brandt, Mar 9, 2017
    Brandt, Mar 9, 2017
    #10
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