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Hop issue around 60-65mph

Discussion in 'International Forum' started by dom14, Apr 29, 2017.

  1. Apr 29, 2017 #1
    dom14

    dom14 Light Load Member

    66
    10
    Oct 18, 2016
    0
    Past few months I've been trying to track down where the hop as been coming from on my truck.. happens around 60-65mph.. tires show no wear alignment and tire guys both find no issues.. I did a lot of bobtailing yesterday and truck ran smooth with no hops.. so obviously trailers are playing a part in this.. could it be a fifth wheel issue? And would bad shocks cause this?
     
    dom14, Apr 29, 2017
    dom14, Apr 29, 2017
    #1
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  3. Apr 29, 2017 #2
    boneebone

    boneebone Road Train Member

    2,294
    2,365
    Mar 13, 2009
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    The shocks job is to dampen the ride and keep the tires planted on the ground.

    If you've never replaced them, I would recommend it.

    Also check the torque arm bushings.
     
    boneebone, Apr 29, 2017
    boneebone, Apr 29, 2017
    #2
    strollinruss Thanks this.
  4. Apr 29, 2017 #3
    Hogleg

    Hogleg Medium Load Member

    311
    258
    Nov 20, 2016
    Salem, Illinois
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    Carrier bearing?
     
    Hogleg, Apr 29, 2017
    Hogleg, Apr 29, 2017
    #3
  5. Apr 29, 2017 #4
    Slay

    Slay Light Load Member

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    134
    Jan 7, 2015
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    Try rotating the tires. I figured out my truck hops due to a couple of bent rims and when they were rotated the hopping changed.Tires and rims look good standing still.
     
    Slay, Apr 29, 2017
    Slay, Apr 29, 2017
    #4
  7. Apr 29, 2017 #5
    Espressolane

    Espressolane Road Train Member

    16,960
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    Nov 21, 2009
    Just south of the north 40
    0
    Did the tire guys check run out? when a tire goes out of round, it can be hard to see, just looking, need to run a gauge on it.
     
    Espressolane, Apr 29, 2017
    Espressolane, Apr 29, 2017
    #5
  8. Apr 29, 2017 #6
    Heavyd

    Heavyd Road Train Member

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    6,184
    Feb 4, 2009
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    Heavyd, Apr 29, 2017
    Heavyd, Apr 29, 2017
    #6
  9. Apr 29, 2017 #7
    AModelCat

    AModelCat Road Train Member

    28,842
    154,213
    Jul 7, 2015
    Canuckistan
    0
    If it runs smooth bobtail and hops with any trailer, I'd check that the leveling valve is working correctly if you have air ride. Not sure what suspension you have or what the spec is for ride height but measure it bobtail and loaded. Should be the same or very close. If the truck sits noticeably lower with a loaded trailer that could possibly be the issue.
     
    AModelCat, Apr 29, 2017
    AModelCat, Apr 29, 2017
    #7
  10. Apr 30, 2017 #8
    dom14

    dom14 Light Load Member

    66
    10
    Oct 18, 2016
    0
    My drivers side mirror shakes like a SOB when the hops start. I need to go to a new tire shop bc the last place jacked up spun the tire and said it was fine. Thank you will update when it's resolved. So if the steer tires are out of round how come it doesn't hop when bobtailing
     
    dom14, Apr 30, 2017
    dom14, Apr 30, 2017
    #8
  11. Apr 30, 2017 #9
    woolybully35us

    woolybully35us Medium Load Member

    313
    550
    Mar 13, 2015
    ks
    0
    I had the same problem. it was trailer tires. but I pull the same trailer all the time.
     
    woolybully35us, Apr 30, 2017
    woolybully35us, Apr 30, 2017
    #9
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