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jerking truck while shifting

Discussion in 'Questions From New Drivers' started by hup, Jul 10, 2011.

Page 1 of 9
  1. Jul 10, 2011 #1
    hup

    hup Medium Load Member

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    Oct 19, 2010
    Missoula, MT
    0
    this is about when I'm heavy, which I mostly am.

    ok, whenever I start from a stop, which I hate btw.. I have to start in like 2nd.. this is on a 10 spd E/F..

    if I start in 3rd it kinda isn't happy.. so I start in 2nd.

    when I start in 2nd, I let out clutch.. truck bounces a bit, then stops once clutch is out. I give it fuel...

    rpm is up, I shift to 3rd, no need to dbl clutch, it just slides into 3rd without a pause or anything.

    now 4th.. I raise rpm to 1400 or so, shift, but the truck kinda lurches wwhen I give it fuel. I've tried shifting higher.. but same thing really. it shifts ok, no grinding, but it lurches. can I make this smoother?

    same goes for 5th.. but as I go higher, it gets smoother of course. its mostly those low gears that cause me non-smooth shifting trouble. what am I doing wrong?
     
    hup, Jul 10, 2011
    hup, Jul 10, 2011
    #1
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  3. Jul 10, 2011 #2
    THBatMan8

    THBatMan8 Road Train Member

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    Wherever I park
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    Try double-clutching the lower gears.
     
    THBatMan8, Jul 10, 2011
    THBatMan8, Jul 10, 2011
    #2
  4. Jul 10, 2011 #3
    Elendil

    Elendil Heavy Load Member

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    Mar 27, 2011
    Ottawa, IL
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    I too drive a 10spd Eaton (KW t660). I always start out in 3rd, never lower than that, and if the load is under 40k, I will often start in 4th. Starting in 3rd you should be able to idle and pull the load (unless on an incline). Sounds like something is out of wack......
     
    Elendil, Jul 10, 2011
    Elendil, Jul 10, 2011
    #3
  5. Jul 10, 2011 #4
    tw1005tx

    tw1005tx Light Load Member

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    Feb 24, 2011
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    Broken motor mounts will make it almost impossible to not jump or jerk if its loaded
    starting out from a stop. How ever once its moving shifting with care its ok.
     
    tw1005tx, Jul 10, 2011
    tw1005tx, Jul 10, 2011
    #4
  7. Jul 10, 2011 #5
    trucker_101

    trucker_101 Heavy Load Member

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    Alberta
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    is it a mac?
     
    trucker_101, Jul 10, 2011
    trucker_101, Jul 10, 2011
    #5
    123456 Thanks this.
  8. Jul 10, 2011 #6
    sidepocket

    sidepocket Light Load Member

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    Mar 1, 2011
    louisa, va
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    just practice...

    turn the jake off if its on...

    try doing things a little slower and smoother...

    youre learning the trans... just practice..
     
    sidepocket, Jul 10, 2011
    sidepocket, Jul 10, 2011
    #6
    Wargames Thanks this.
  9. Jul 11, 2011 #7
    BigJohn54

    BigJohn54 Gone, but NEVER forgotten

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    Is it normal to start in gears other than first? I never start a loaded truck in anything but first. To me the jerking when taking off is typical of starting in too high a gear.
     
    BigJohn54, Jul 11, 2011
    BigJohn54, Jul 11, 2011
    #7
    Diesel Dave, Big Duker, Truck Driver and 4 others Thank this.
  10. Jul 11, 2011 #8
    Onetruckpony

    Onetruckpony Medium Load Member

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    Jun 11, 2011
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    I pull light loads and start in second or third all the time if on flat ground.
    Im sure others will disagree but I find no need for lower gears to get a lighter load rolling.
    I would think if the problem were motor mounts it would do it whenever throttle/torque was applied.
    Watch your speed as well as RPM. The low side has a much tighter/more responsive spread between gears, shift slower and ease on the throttle.
    Hope this helps.
    We all get a good laugh at guys doing wheelies between gears.
     
    Onetruckpony, Jul 11, 2011
    Onetruckpony, Jul 11, 2011
    #8
    Zudo and jcroom76 Thank this.
  11. Jul 11, 2011 #9
    Cowmobile

    Cowmobile Medium Load Member

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    The hammer lane....
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    I always start in third when loaded unless on an incline.. When empty I can start in 4th or 5th...
     
    Cowmobile, Jul 11, 2011
    Cowmobile, Jul 11, 2011
    #9
  12. Jul 11, 2011 #10
    Palazon

    Palazon Road Train Member

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    Feb 5, 2009
    Tacoma, WA
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    I drove at 100k lbs gross using a 13 spd (freightshaker, 4 axle truck and 4 axle trailers). Only time I dropped below 3rd was starting on a grade. Nice easy and smooth.

    PS: My light loads were 45,000 lbs:biggrin_2559:

    To OP: I can't really describe how I do it, it's kind of a "feel" thing if you get my drift. I would have the shop check the clutch adjustment and the above meantioned motor mounts.
     
    Last edited: Jul 11, 2011
    Palazon, Jul 11, 2011
    Palazon, Jul 11, 2011
    #10
    otherhalftw Thanks this.
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