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Loud clunk when turning

Discussion in 'Trucks [ Eighteen Wheelers ]' started by gokiddogo, Oct 1, 2012.

Page 1 of 3
  1. Oct 1, 2012 #1
    gokiddogo

    gokiddogo Road Train Member

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    Ontario Canada
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    When I turn sharp enough right, only maybe 45 degrees between truck and trailer or sharper, when it is straightening out again there is almost always a loud clunk that sounds like it is coming from the rear end of the truck. It happens way more often when loaded heavy (80k). Turning left does not do it. Had truck wheel bearings done about 50k miles ago, this is just starting to happen now. Also going down the road at speed when not very heavy there is a vibration, almost like a wheel is out of balance. Had a 3 axle alignment also about 50k miles ago. The right rear inside tire is beginning to wear improperly, some of the teeth on the tire have odd angles on the faces. The truck and trailer both just had their annual safety, I had my mechanic look over especially whole suspension system and he said it is all in great shape. The truck has new shocks on the back. When bobtail it feels like one of the wheels is an egg shape.

    ?
     
    gokiddogo, Oct 1, 2012
    gokiddogo, Oct 1, 2012
    #1
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  3. Oct 1, 2012 #2
    papanuge

    papanuge Light Load Member

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    Sep 18, 2010
    Anderson, AL 35610
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    Look for u-joint or carrier bearing problem.
     
    papanuge, Oct 1, 2012
    papanuge, Oct 1, 2012
    #2
  4. Oct 1, 2012 #3
    bender

    bender Road Train Member

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    Don't Kid Yourself
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    Also check your driveline slip yokes for being properly lubed and free (not frozen or binding).
    I would also drain a sample from both diffs to check for metal content, could have axle side gear/spider gears or cross failing in one of the diffs.
     
    bender, Oct 1, 2012
    bender, Oct 1, 2012
    #3
  5. Oct 1, 2012 #4
    belltransit

    belltransit Light Load Member

    271
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    Jun 28, 2010
    oak grove, mo
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    i was thinking i was the only one that had the egg shaped feel..glad to know im not alone...keep us posted on if u find and fix the problem please
     
    belltransit, Oct 1, 2012
    belltransit, Oct 1, 2012
    #4
  7. Oct 1, 2012 #5
    Superhauler

    Superhauler TEACHER OF MEN

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    Jan 30, 2010
    keep stroking.
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    check and see if you might have a cracked inside wheel on the odd wearing tire or loose lug nuts.
     
    Superhauler, Oct 1, 2012
    Superhauler, Oct 1, 2012
    #5
  8. Oct 2, 2012 #6
    bubbanbrenda

    bubbanbrenda Road Train Member

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    Feb 27, 2011
    Middletown,Oh.
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    I noticed in your avitar your drivind a KW, If it has AG-400 suspension and has more than 500,000 on it it probably needs rebushed mine did.Also if it feels like a egg-shaped tire it just might be,about a month after my rebush mine started "hopping" down the road,after two trips to the suspesion shop they sent me to their tire expert took him about 10 min. to figure out which tire had the broken belt.
     
    bubbanbrenda, Oct 2, 2012
    bubbanbrenda, Oct 2, 2012
    #6
  9. Oct 2, 2012 #7
    bubbanbrenda

    bubbanbrenda Road Train Member

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    Feb 27, 2011
    Middletown,Oh.
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    If I was a betting man my $ would be on bushing or two being shot get it into a good suspension shop,they will fixx you right up.
     
    bubbanbrenda, Oct 2, 2012
    bubbanbrenda, Oct 2, 2012
    #7
  10. Oct 2, 2012 #8
    Guntoter

    Guntoter Road Train Member

    1,659
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    Mar 24, 2012
    Phoenix, AZ
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    Panhard bar? Bushings? Do a visual, see if any rubber is cracked or missing.
     
    Guntoter, Oct 2, 2012
    Guntoter, Oct 2, 2012
    #8
  11. Oct 2, 2012 #9
    Down under trucker

    Down under trucker Light Load Member

    145
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    Jun 22, 2012
    Brisbane, Australia
    0
    What type of suspention do you have? If it is 6-rod becuase the springs are not physicly attached to the axel housing they just sit on top, if you turn sharply the springs "load up" where they sit on the axel, because the springs want the stay straight but the axels are trying to move sideways, until there is too much force and they move where sit on the axel housing. It may sound bad but this is totally normal and how they are designed to work and they may only move a couple of mm but it is enough to make the noise. You can jack up the rear end and grease inbetween them and it will stop.

    [​IMG]

    You can see in this image that it has rubber inbetween the springs and axel housing. Alot of the time they don't have this and the springs just sit on a plate and that is the cause of the bang when turning. I have had 3 trucks with 6-rod and they have all done this.

    If you have air bags I dont know just what the other say.
     
    Last edited: Oct 2, 2012
    Down under trucker, Oct 2, 2012
    Down under trucker, Oct 2, 2012
    #9
  12. Oct 2, 2012 #10
    Down under trucker

    Down under trucker Light Load Member

    145
    64
    Jun 22, 2012
    Brisbane, Australia
    0
    I have just seen that you said you have replaced the shocks on the back which mean you must have airbags.
     
    Down under trucker, Oct 2, 2012
    Down under trucker, Oct 2, 2012
    #10
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