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Auxiliary Clunks When Splitting Gear

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Koba Gold, Aug 14, 2020.

  1. Aug 14, 2020 #1
    Koba Gold

    Koba Gold Bobtail Member

    3
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    Aug 14, 2020
    British Columbia
    0
    Hey guys,

    New to the forum and fairly new to the trucking biz.

    Sometimes when splitting a gear from low to high I get a clunking sound, like as if there is slack in there or something.

    Happens when loaded or empty.

    I'll be driving, foot on throttle, flip from low to high, left off the throttle and CLUNK!

    Any insight would be greatly appreciated.

    Transmission is an 18 speed Eaton Fuller on a Tandem 1998 kenworth with an N14 4:30 diffs. Also just had the front diff replaced.
     
    Koba Gold, Aug 14, 2020
    Koba Gold, Aug 14, 2020
    #1
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  3. Aug 14, 2020 #2
    bad-luck

    bad-luck Road Train Member

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    Baltimore, Maryland
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    Could be u joints and or a bad yolk. If it is coming from the transmission could be the synchronizer is going bad
     
    bad-luck, Aug 14, 2020
    bad-luck, Aug 14, 2020
    #2
  4. Aug 14, 2020 #3
    AModelCat

    AModelCat Road Train Member

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    Canuckistan
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    Split or range? Split has no synchronizer IIRC.

    If its the split, may want to check the regulator on the transmission. The transmissions are designed to work at something like 70 or 75 PSI. Not sure of the exact spec but if the piston is getting full 120 PSI I believe it can cause harsh engagement during the low to high split.
     
    AModelCat, Aug 14, 2020
    AModelCat, Aug 14, 2020
    #3
    Oxbow, Deere hunter and 650cat425 Thank this.
  5. Aug 18, 2020 #4
    Koba Gold

    Koba Gold Bobtail Member

    3
    0
    Aug 14, 2020
    British Columbia
    0

    It's the splitter, grey thumb switch on the side, and I have it narrowed down to gears 5 and 6. When splitting from low to high in either of those gears it's sometimes clunks. I can split every other Gear with no issue
     
    Koba Gold, Aug 18, 2020
    Koba Gold, Aug 18, 2020
    #4
  7. Aug 24, 2023 #5
    Loneone-

    Loneone- Bobtail Member

    3
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    Aug 11, 2023
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    Ever figure out what the problem was?
     
    Loneone-, Aug 24, 2023
    Loneone-, Aug 24, 2023
    #5
  8. Aug 24, 2023 #6
    Gridaxe5588

    Gridaxe5588 Light Load Member

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    Nov 23, 2022
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    I would hope so since it was 3 years ago.
     
    Gridaxe5588, Aug 24, 2023
    Gridaxe5588, Aug 24, 2023
    #6
  9. Jun 29, 2024 #7
    Ericgzz711

    Ericgzz711 Bobtail Member

    1
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    Jun 29, 2024
    0
    did you solve this issue if so what was the problem? I’m having the exact same symptoms
     
    Ericgzz711, Jun 29, 2024
    Ericgzz711, Jun 29, 2024
    #7
  10. Jun 30, 2024 #8
    Deere hunter

    Deere hunter Road Train Member

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    That was his one and only post from 2020 and he's never been back.
     
    Deere hunter, Jun 30, 2024
    Deere hunter, Jun 30, 2024
    #8
  11. Jun 30, 2024 #9
    Judge

    Judge Road Train Member

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    syncronizer is out, also called slave gear, plus change the splitter button itself.
    It’s not that expensive, shops will fix it.
     
    Judge, Jun 30, 2024
    Judge, Jun 30, 2024
    #9
    Deere hunter Thanks this.
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