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Problems w MP8 mDrive transmission 1st time owner

Discussion in 'Ask An Owner Operator' started by istrum, Nov 18, 2020.

  1. Nov 18, 2020 #1
    istrum

    istrum Bobtail Member

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    Jan 24, 2018
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    My equipment....
    2015 Mack chu613 Pinnacle
    MP8 mDrive
    Bought at 212 thousand miles (March 2020)
    Now at 279 thousand miles (Today, Nov 2020)

    The transmission problem is that it started to not have any power or engagement in the even numbered gears (2,4,6,8,10,12) ... rpms to 1000 but no power .... odd number gears working fine, but the mDrive still moves to the even gears and thus I get stuck with no power and forced to go to manual mode and still no power in the even gears.

    I brought it in for service and I am wondering about others with experience with the MP8 and mDrive from this year (2015) or other years. Has anyone had a rebuild? Or reman? done or installed? What was the cost? How much (hrs) labor? What was the parts cost? What's your story with either the cxu or chu models?

    Thanks.
     
    istrum, Nov 18, 2020
    istrum, Nov 18, 2020
    #1
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  3. Nov 18, 2020 #2
    Ridgeline

    Ridgeline Road Train Member

    20,729
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    Dec 18, 2011
    Michigan
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    Rebuild with that amount of miles?

    no way.

    this sounds like a firmware issue.

    Have the dealer see if there is an update on the trans firmware.
     
    Ridgeline, Nov 18, 2020
    Ridgeline, Nov 18, 2020
    #2
    istrum Thanks this.
  4. Nov 20, 2020 #4
    DaytonTD

    DaytonTD Light Load Member

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    Jul 14, 2019
    Edmonton, Alberta
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    Unless you hear grinding or clunking it's probably an electrical or computer issue, possibly something physical like a solenoid. Doubt you need a new transmission with those low miles
     
    DaytonTD, Nov 20, 2020
    DaytonTD, Nov 20, 2020
    #4
  5. Nov 21, 2020 #4
    Socal Xpress

    Socal Xpress Road Train Member

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    Los Angeles, Ca
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    @istrum

    Couple of things Mack and Volvo share Engines and transmissions. So Mdrive is the same as Ishift transmission. Mp8 is a D13.

    Volvo has a 750k transmission warranty on the Ishift. I am not sure of Mdrive has the same warranty. Replacing the complete MDrive is pricey but at the mileage you are at it should be covered under warranty.
    Edit (MACK also covers Mdrice to 750k)
     
    Last edited: Nov 21, 2020
    Reason for edit: More information
    Socal Xpress, Nov 21, 2020
    Socal Xpress, Nov 21, 2020
    #4
    AModelCat Thanks this.
  7. Nov 21, 2020 #5
    AModelCat

    AModelCat Road Train Member

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    Hopefully the time limits on the warranty haven't been exceeded yet.
     
    AModelCat, Nov 21, 2020
    AModelCat, Nov 21, 2020
    #5
  8. Nov 21, 2020 #6
    Socal Xpress

    Socal Xpress Road Train Member

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    60months or 750k. He may get lucky.
     
    Socal Xpress, Nov 21, 2020
    Socal Xpress, Nov 21, 2020
    #6
    AModelCat Thanks this.
  9. Nov 21, 2020 #7
    AModelCat

    AModelCat Road Train Member

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    Even if its just off, might be able to get some goodwill out of them due to having such low mileage on it.
     
    AModelCat, Nov 21, 2020
    AModelCat, Nov 21, 2020
    #7
    Socal Xpress Thanks this.
  10. Oct 6, 2022 #9
    Gracefarms

    Gracefarms Bobtail Member

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    Oct 6, 2022
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    Did you ever find a fix having the same trouble
     
    Gracefarms, Oct 6, 2022
    Gracefarms, Oct 6, 2022
    #9
    pusherman Thanks this.
  11. Dec 22, 2022 #9
    Mr Bob

    Mr Bob Light Load Member

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    Mar 17, 2015
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    I see all kinds of problems with isht tranys. last two stuck in gear wont start.
     
    Mr Bob, Dec 22, 2022
    Mr Bob, Dec 22, 2022
    #9
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