Vibration at low end torque

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by stayinback, Jun 17, 2019.

  1. stayinback

    stayinback Road Train Member

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    I just replaced a worn out carrier bearing, Now I have a vibration at low rpm's in 4th thru 7th gear- doesn't matter loaded or empty-Loaded its more significant. Once reaching normal operation 1500-1600rpm,its fine and smooth.
    Checked for play in yokes-everythings tight.
    I have some seepage at rear of transmission pinion.

    Any ideas? I did NOT have a vibration before I changed carrier.
     
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  3. Cam Roberts

    Cam Roberts Road Train Member

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    if no play in out put shaft than it is fine
     
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  4. Navtech

    Navtech Light Load Member

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    I would check and make sure a weight didn’t get accidentally knocked off the drive line during the carrier replacement
     
  5. Cam Roberts

    Cam Roberts Road Train Member

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    doesnt make sense in his post at all though. its not driveline speed related at all. He says its rpm related. Only thing rpm related would be motor balance. Better check the balancer. If its throwing that much vibration where you can feel it, good by crank and good by motor
     
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  6. Navtech

    Navtech Light Load Member

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    I was just going off more the “didn’t have vibration before I replaced the carrier” comment
     
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  7. stayinback

    stayinback Road Train Member

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    Its not Crank Related-Motor mounts are good- Coming from the Trans- Output shaft- Im gonna pull the back half off and check bearings.

    Only feel it in the seat-maybe a touch on the wqheel , ONLY UNDER TORQUE CONDITIONS-
     
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  8. Deere hunter

    Deere hunter Road Train Member

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    Your driveline yolks have to be lined up when you put it back together you may have got it off just a little bit and that will make your driveline vibrate !!
     
  9. lwlevens

    lwlevens Medium Load Member

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    Install the old carrier bearing if you still have it and see what happens.
     
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  10. Rideandrepair

    Rideandrepair Road Train Member

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    Remove driveshaft and turn it half way around and re install. They should always be marked and Re-installed the same way. It can only go 2 ways.
     
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  11. Rideandrepair

    Rideandrepair Road Train Member

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    Also you probably know, new straps and bolts, and torque proper. I learned the hard way broke bolt off in yoke, had to replace it. Made Me a believer. Lol
     
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