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Mack vision 460

Discussion in 'Mack Forum' started by 09milesl, Sep 6, 2023.

  1. Sep 6, 2023 #1
    09milesl

    09milesl Bobtail Member

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    Sep 6, 2023
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    I have a Mack vision 460 with an automatic ten speed. All summer long it shifts great. Once fall and spring com around with temps below 55 the transmission will glitch and flash service and won’t do anything. Sometimes if you let it run for a few hours it will start to work like normal. Anyone have any ideas?
     
    09milesl, Sep 6, 2023
    09milesl, Sep 6, 2023
    #1
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  3. Sep 6, 2023 #2
    beastr123

    beastr123 Road Train Member

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    That sounds like moisture in your servos mostly oil residue.
    Flush your servos with methyl hydrate after changing your air dryer filter and flushing your air tanks.
    A simple flush tool is a discarded fire extinguisher with a valve and hose connection and a Schrader valve to pressure the extinguisher.
     
    beastr123, Sep 6, 2023
    beastr123, Sep 6, 2023
    #2
  4. Sep 7, 2023 #3
    09milesl

    09milesl Bobtail Member

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    Sep 6, 2023
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    Not to familiar with what a servos is and where it would be located. I did change the air dryer filter last fall while we were having issues trying to eliminate things.
     
    09milesl, Sep 7, 2023
    09milesl, Sep 7, 2023
    #3
  5. Sep 7, 2023 #4
    beastr123

    beastr123 Road Train Member

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    the servo(s) I am referring to are the air to mechanical servo(s) that are controlled by the buttons on the shifter and move the shifting fork(s) in the transmission. there are spools in each that have seals and any oil in them turns gummy and the spools do not move smoothly until the transmission warms up and loosens the oil. the oil is introduced primarily from the air compressor through the air dryer and into the air tanks.
     
    beastr123, Sep 7, 2023
    beastr123, Sep 7, 2023
    #4
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