What am I missing here?

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Spartanmetal, Feb 2, 2020.

  1. Spartanmetal

    Spartanmetal Bobtail Member

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    Nov 23, 2019
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    I have a question re: ultrashift plus transmissions
    I drive a 2020 kenworth t680 with a Cummins x15
    And a 13 speed ultrashift transmission.

    How do I engage the engine brake in 8 gear or less. The jake works great on the highway but if I want to crawl down a steep hill I can’t figure out how to engage the jake. A work around is to speed up to 10th and then the jake works fine and I can control my speed from there.
    Has anyone else experienced this or is it just me .

    I am thinking that there has to be some parameters that the shop guys can change with their computer

    Ken
     
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  3. blairandgretchen

    blairandgretchen Road Train Member

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    Probably parameters.

    Personally, with a 13 manual, I’m off the jakes below 8th gear - 3:55 rears.
     
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  4. 062

    062 Road Train Member

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    You probably have mufflers on your truck too.... smh how you going to Jake through the parking lot at 3am?
    To the op most likely parameters. I have mine set to work above 10mph.
     
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  5. Ffx95

    Ffx95 Road Train Member

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    I have a t680 but with a Paccar and the Endurant. The jakes cut off at around 15mph but it will work regardless of gear or speed if I set it in manual mode. Give that a try?
     
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  6. blairandgretchen

    blairandgretchen Road Train Member

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    3am?

    I’m still in bed dreaming the boss will give me a shiny new Cascadia.
     
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  7. haycarter

    haycarter Road Train Member

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    ^^^^^^^^^What he said^^^^^^^^^^^^^^
     
  8. Spartanmetal

    Spartanmetal Bobtail Member

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    I did try that,
    I am going to get the shop to try and change some parameters.
    I am just new to this ultrashift stuff.
     
    haycarter Thanks this.
  9. Spartanmetal

    Spartanmetal Bobtail Member

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    Nov 23, 2019
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    If anyone is interested in the solution to my Jake brake issues, it was a setting in the parameters. The Jake was set to turn of at speeds under 35 mph. Up here in British Columbia , Canada, that just won't work. We set the cut off speed down to 15 mph. I haven't tried it yet, but that should work a lot better.
    Drive safe,
    Ken
     
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