noisey transmission 18spd

Discussion in 'Kenworth Forum' started by hiwayangel, Mar 6, 2021.

  1. hiwayangel

    hiwayangel Bobtail Member

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    Well looking for someone that can tell me what going on here. Transmission is brand new eaton 18spd. When i step on the clutch and put truck into gear all is ok but when i release the clutch and i dont apply any throttle and just let the truck crawl or if i loaded and and ground is soft as i move there is alot of noise coming out of the trans. Its quiet after you get it rolling and temperature seems steady at 200 degrees all day. I first thought it was the release bearing but it made this sound with the old trans just not as loud or as bad. Seems to be getting worst but cant find anything. Did a plug swap on trans and it was clean. The truck has a Cummins ISX 565 if it matters. My 34 yrs of running Cat motors i never heard crap like this. Anyone hear of this noise problem before. What was it and what the renedy to fix it. Thanks in advance
     
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  3. BoxCarKidd

    BoxCarKidd Road Train Member

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    Brand new 18 speed or a reman?
     
  4. hiwayangel

    hiwayangel Bobtail Member

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  5. hiwayangel

    hiwayangel Bobtail Member

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    i am trying to find a brand new truck that i can look at the linkage and swivels on the linkage to see how tight they are for comparison
     
  6. hiwayangel

    hiwayangel Bobtail Member

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    The shop is wanting me to pull the trans so they can inspect it and then send it back to eaton. If they take it apart and find nothing wrong then i pay for everything including labor and oil
     
  7. Snailexpress

    Snailexpress Road Train Member

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    I have same rattling noise you described for. Only when truck crawl. Transmission is Eaton 13 speed. Transmission was off, inspected, input shaft bearing installed new. New clutch.New throw bearing. Nothing changes.
    I know at least one more truck with same rattling when crawl but transmission is 10 speed.
    All trucks with Cummins engine.
     
  8. AModelCat

    AModelCat Road Train Member

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    I know Eaton went to an updated input shaft with thinner splines and it creates a little rotational slop between the input shaft and input drive gear. I was told by a gear shop that it'll cause a slight rattle with a PTO engaged. I can't see how idling along in low gear couldn't create the same effect. Idling along in low gear probably uses just as much power as a PTO.

    @Hulld I think you mentioned something about this at one time or am I mistaken?
     
    Bean Jr., Hulld, Coffey and 1 other person Thank this.
  9. AModelCat

    AModelCat Road Train Member

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    Here's a thread I started a few years back about the input shaft changes. Mine's an older 15 speed but I was led to believe Eaton made this update to many transmission models.
     
    Snailexpress Thanks this.
  10. hiwayangel

    hiwayangel Bobtail Member

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    Yes thats EXACTLY what mine is doing
     
  11. hiwayangel

    hiwayangel Bobtail Member

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    Hell there is a big difference in the teeth not much for tooth on the new ons
     
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