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zf 12spd transmission

Discussion in 'Trucks [ Eighteen Wheelers ]' started by kle135, Jan 18, 2014.

  1. Jan 18, 2014 #1
    kle135

    kle135 Bobtail Member

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    Jan 18, 2014
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    I have a Volvo with zf 12spd autoshift. When down shifting from 7 to 6 there is a slight grinding sound.Does anyone have any ideas.Thanks
     
    kle135, Jan 18, 2014
    kle135, Jan 18, 2014
    #1
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  3. Jan 18, 2014 #2
    Helowrenchturn2

    Helowrenchturn2 Medium Load Member

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    The only thing I can really think of is maybe one of the sliding clutches isn't engaging properly from being worn. Or possibly the electronic shifter messing up
     
    Helowrenchturn2, Jan 18, 2014
    Helowrenchturn2, Jan 18, 2014
    #2
  4. Jan 19, 2014 #3
    Pablo-UA

    Pablo-UA Road Train Member

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    Oct 11, 2010
    Borispol, Ukraine
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    ouh no, it is worn range synchro, tranny about million miles and range unit would be rebuilt
     
    Pablo-UA, Jan 19, 2014
    Pablo-UA, Jan 19, 2014
    #3
  5. Jan 19, 2014 #4
    kle135

    kle135 Bobtail Member

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    Jan 18, 2014
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    Thanks, Can that be done without disassembling entire trans. Truck has 700,000 . Transmission is a 12spd zf freedomline autoshift
     
    kle135, Jan 19, 2014
    kle135, Jan 19, 2014
    #4
  7. Jan 19, 2014 #5
    Pablo-UA

    Pablo-UA Road Train Member

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    Oct 11, 2010
    Borispol, Ukraine
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    on cabovers it is possible to remove range planetary gear from tranny but conventional design truck is other thing. with tranny on truck it is easy to damage wiring of TCU, speed sensors... so I'd drop tranny.
     
    Pablo-UA, Jan 19, 2014
    Pablo-UA, Jan 19, 2014
    #5
  8. Jan 19, 2014 #6
    kle135

    kle135 Bobtail Member

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    Jan 18, 2014
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    Thanks , I will have tranny out to replace clutch. Can syncro be repaired by removing back cover or does it need to go to rebuild shop?
     
    kle135, Jan 19, 2014
    kle135, Jan 19, 2014
    #6
  9. Jan 19, 2014 #7
    Pablo-UA

    Pablo-UA Road Train Member

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    Oct 11, 2010
    Borispol, Ukraine
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    Not so easy. U have to remove TCU with shift cylinders. Really it is ZF astronic tranny, but with 12 to 24V converter and ZM Tec modul. To remove TCU is easy, but when u install it = be sure shift pistons fit rails, else it may crack when u tigten bolts
     
    Pablo-UA, Jan 19, 2014
    Pablo-UA, Jan 19, 2014
    #7
  10. Jan 19, 2014 #8
    Pablo-UA

    Pablo-UA Road Train Member

    7,604
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    Oct 11, 2010
    Borispol, Ukraine
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    BTW, all the manuals are available on ZF portal
     
    Pablo-UA, Jan 19, 2014
    Pablo-UA, Jan 19, 2014
    #8
  11. Jan 19, 2014 #9
    Pablo-UA

    Pablo-UA Road Train Member

    7,604
    1,640
    Oct 11, 2010
    Borispol, Ukraine
    0
    Pablo-UA, Jan 19, 2014
    Pablo-UA, Jan 19, 2014
    #9
  12. Jan 19, 2014 #10
    kle135

    kle135 Bobtail Member

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    Jan 18, 2014
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    thanks again
     
    kle135, Jan 19, 2014
    kle135, Jan 19, 2014
    #10
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