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Anyone know 13 speeds Eatons really well?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by 6cuda6, Dec 28, 2020.

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  1. Dec 28, 2020 #1
    6cuda6

    6cuda6 Light Load Member

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    I have an oddity....Eaton 13 speed manual....upshifts and downshifts fine except downshifting from high to low in 8th or 13 to 12.....seems to grind or not make the shift when you let off and reapply throttle...upshifts fine. IF you downshift from high to low in any other gear it's fine just not 8th or 13th.

    Ideas and insite?
     
    6cuda6, Dec 28, 2020
    6cuda6, Dec 28, 2020
    #1
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  3. Dec 28, 2020 #2
    AModelCat

    AModelCat Road Train Member

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    Came to see what a 12 speed Eaton is lol.

    Just on the downshift? Is the splitter acting lazy?
     
    AModelCat, Dec 28, 2020
    AModelCat, Dec 28, 2020
    #2
  4. Dec 28, 2020 #3
    Super_Trucker

    Super_Trucker Bobtail Member

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    Haha me too
     
    Super_Trucker, Dec 28, 2020
    Super_Trucker, Dec 28, 2020
    #3
  5. Dec 28, 2020 #4
    6cuda6

    6cuda6 Light Load Member

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    Yup....working like a 12 speed ...lol.
    Yah downshift from 13 to 12 only....seems lazy but i have nothing to compare it to.....all other gears seem fine though even if it is lazy. It kinda "hangs there" mid shift and if you put it back into high it goes back, doesnt like it of course but it does [if this was a car i'd say the shift fork was worn out on that side but it's not like that i beleive?]
     
    6cuda6, Dec 28, 2020
    6cuda6, Dec 28, 2020
    #4
  7. Dec 28, 2020 #5
    6cuda6

    6cuda6 Light Load Member

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    As above.....lol.
     
    6cuda6, Dec 28, 2020
    6cuda6, Dec 28, 2020
    #5
  8. Dec 28, 2020 #6
    blairandgretchen

    blairandgretchen Road Train Member

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    Well, I’m intrigued.

    I had mine redone - and watched the guy do it. He’s well experienced with them.

    Mine, on the odd occasions, when splitting up from 12 to 13, doesn’t want to go. Just hangs in limbo, and free revs.
     
    blairandgretchen, Dec 28, 2020
    blairandgretchen, Dec 28, 2020
    #6
    jamespmack Thanks this.
  9. Dec 29, 2020 #7
    Goodysnap

    Goodysnap Road Train Member

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    I would re- oring the splitter cylinder. Sometimes they get logged with oil or just plain dry orings. Coat the rings good with the supplied Eaton grease ....its good stuff. The kits cheap and its a 30 min job if youve done it before.
     
    Goodysnap, Dec 29, 2020
    Goodysnap, Dec 29, 2020
    #7
    spsauerland, blairandgretchen, jamespmack and 3 others Thank this.
  10. Dec 29, 2020 #8
    6cuda6

    6cuda6 Light Load Member

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    Sounds like a plan....nothing to loose and all to gain.
     
    6cuda6, Dec 29, 2020
    6cuda6, Dec 29, 2020
    #8
    blairandgretchen, Coffey and Goodysnap Thank this.
  11. Dec 29, 2020 #9
    jamespmack

    jamespmack Road Train Member

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    Make sure all exhaust ports are clean, and filter regulator is clean on transmission before you do anything. If your in cold climate like half of us are this time of year, when was the last time you changed you truck air dryer? Or drained your air tanks. Small air lines always freeze first.

    All of eatons books are free online. Just need model number. They have decent flow charts.
     
    jamespmack, Dec 29, 2020
    jamespmack, Dec 29, 2020
    #9
    blairandgretchen, Goodysnap and 6cuda6 Thank this.
  12. Dec 29, 2020 #10
    6cuda6

    6cuda6 Light Load Member

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    Air dryer desicant changed, dryer cleaned out.....tanks drained regularly.

    Will check filter/reg as dryer can was pretty nasty (new to me truck)
     
    6cuda6, Dec 29, 2020
    6cuda6, Dec 29, 2020
    #10
    blairandgretchen and jamespmack Thank this.
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