Fuller 9513 air/splitter problem???

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by troche, Dec 6, 2023.

  1. troche

    troche Bobtail Member

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    Dec 6, 2023
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    I have an 87 ford 8000 with a fuller 9513 and I can’t split in high range. Low and direct drive are the same speed. One I get into overdrive there is no splitting. Allegedly there is a new slave cylinder per the guy I bought it from. Are the air lines ran incorrectly? Or is this a bigger issue? Thank you!
     
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  3. Big Road Skateboard

    Big Road Skateboard Road Train Member

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    Just a single small air lines runs to the splitter cylinder on the lower left of the aux section. Remove the air line and see if ypu have air when you push the splitter forward.

    Do you hear any noise when splitting?
     
  4. Star Rider

    Star Rider Road Train Member

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    You say low and direct are the same speed, if is stuck in low and not going into direct it won't split.
     
  5. troche

    troche Bobtail Member

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    Dec 6, 2023
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    Grinding like things are trying to move but just won’t. I have to put it in neutral, select O.D. And wait till I can feel it stop grinding, then select my gear and keep going. As of right now I basically have to drive it like a 9 speed,

    When I have the truck shut off and move between direct and O.D. I can hear what sound a like it going in and out of high and low range since it is quite a bit louder then just splitting in my experience.
     
  6. troche

    troche Bobtail Member

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    How would you suggest checking that?
     
  7. W923

    W923 Road Train Member

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    What air valves are on the shifter.
    Not saying what you are experiencing is normal but those old 13 speeds don’t seem to shift like a modern one. I have a 9513 behind a 855 and it often will not split without grinding and sometimes loses its place. It’s way more of a problem with cold oil. I have been told replacing the little air lines with the next size up helps a lot but never tried it and just lean how to work with it as far as timing my shifts.
     
  8. BoxCarKidd

    BoxCarKidd Road Train Member

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    Did it ever work for you or you bought it in this condition? What did you buy? The whole truck or just the transmission?
     
  9. troche

    troche Bobtail Member

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    I took that air line off and I have air when it’s in direct and O.D. Is that correct?
     
  10. troche

    troche Bobtail Member

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    I bought the whole truck it has been like that since I bought it.
     
  11. BoxCarKidd

    BoxCarKidd Road Train Member

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    no
     
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