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2018 Peterbilt 389 isx15 rear lift axle wobbles horribly

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Jerrywalters, Feb 15, 2019.

  1. Feb 15, 2019 #1
    Jerrywalters

    Jerrywalters Bobtail Member

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    Feb 15, 2019
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    We're having trouble with the rear lift axle (steerable) wobbling while the trucks moving 15mph+. We had all the bushings, shocks and tires replaced on the axle a few days ago an had the air pressure adjusted. The new shocks have already blown out so looking for any advice as to what could be the issue. We've also had the bearings and kingpins inspected.
     
    Jerrywalters, Feb 15, 2019
    Jerrywalters, Feb 15, 2019
    #1
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  3. Feb 15, 2019 #2
    Tombstone69

    Tombstone69 Road Train Member

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    Pictures?
     
    Tombstone69, Feb 15, 2019
    Tombstone69, Feb 15, 2019
    #2
    Jerrywalters and BoxCarKidd Thank this.
  4. Feb 15, 2019 #3
    BoxCarKidd

    BoxCarKidd Road Train Member

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    Alignment?
     
    BoxCarKidd, Feb 15, 2019
    BoxCarKidd, Feb 15, 2019
    #3
    Jerrywalters, pushbroom and spsauerland Thank this.
  5. Feb 15, 2019 #4
    spsauerland

    spsauerland Road Train Member

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    What is toe set @ and what down pressure running in ride bags.
     
    spsauerland, Feb 15, 2019
    spsauerland, Feb 15, 2019
    #4
    Jerrywalters and pushbroom Thank this.
  7. Feb 16, 2019 #5
    Tombstone69

    Tombstone69 Road Train Member

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    No pictures? Try getting a stabilizer.
     
    Tombstone69, Feb 16, 2019
    Tombstone69, Feb 16, 2019
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    Jerrywalters Thanks this.
  8. Feb 18, 2019 #6
    Jerrywalters

    Jerrywalters Bobtail Member

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    Sorry been busy with some other stuff . What kind of pictures would u like? Pressure been tested between 45 and 65 with same issue. We're gonna trying adjusting toe when we get the chance today
     

    Attached Files:

    Jerrywalters, Feb 18, 2019
    Jerrywalters, Feb 18, 2019
    #6
  9. Feb 18, 2019 #7
    Tombstone69

    Tombstone69 Road Train Member

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    Tire balance?
     
    Tombstone69, Feb 18, 2019
    Tombstone69, Feb 18, 2019
    #7
  10. Feb 18, 2019 #8
    spsauerland

    spsauerland Road Train Member

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    By your picture it is a Watson Chalin lift axle. You can find their manuals online and they have a load/pressure chart. We run ours around 60-65 psi on quad and quint axles with the 12K and 13.2K lift axles. They recommend 1/32 of toe, I always made it a strong 1/32 or more of a 1/16.
     
    spsauerland, Feb 18, 2019
    spsauerland, Feb 18, 2019
    #8
    Jerrywalters, BoxCarKidd and pushbroom Thank this.
  11. Mar 7, 2019 #9
    Jerrywalters

    Jerrywalters Bobtail Member

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    Problem has been solved. We were replacing the rear shocks with the monroe brand which apparently cant handle the loads we haul. After replacing them out with original Watson Chalin shocks, all the trucks with the wobbles are now riding smoothly. Thanks for the replies and help
     
    Jerrywalters, Mar 7, 2019
    Jerrywalters, Mar 7, 2019
    #9
    BoxCarKidd and Tombstone69 Thank this.
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