Need help with transmission air leak... Eaton Fuller

Discussion in 'Trucks [ Eighteen Wheelers ]' started by blanco, Sep 29, 2010.

  1. blanco

    blanco Road Train Member

    Nov 20, 2009
    Gwinnett County, GA
    Truck came in with a leak from the "air control module" K3245 on an Eaton Fuller FRO 16210C transmisson.

    Driver went and bought a replacement but alas, as truck aired up, the leak started from the same "brand" new module.

    Has anyone had any expierence with this type of issue?

    This particular module is on top of the transmission on a 1999 Volvo VNL.
  2. blanco

    blanco Road Train Member

    Nov 20, 2009
    Gwinnett County, GA
    Another mechanic advised that it "could" be the selector on the top of the shifter. :-(
  3. bladehate

    bladehate Bobtail Member

    Jul 27, 2009
    Syracuse, NY
    sometimes water gets into the cylinder for the range selector in the top cover. it corrodes in there and the piston cant move, so the air just leaks out. it could progress to the point that eventually you wont have low range anymore.
    Dan_ram14 Thanks this.
  4. blanco

    blanco Road Train Member

    Nov 20, 2009
    Gwinnett County, GA
    driver is getting it towed to a shop here in Atlanta. will post update as i get it.
    uncleal13 Thanks this.
  5. mitchtazz

    mitchtazz Road Train Member

    Sep 6, 2009
    Lake Wales, Fl
    my dad lost the high side on his super ten once.. only had odd number gears and shifted like a five speed while loaded.. are was hissing out of the gear shift knob.. took it apart and found out that the rubber seal on the splitter had rolled (no lub) used the grease we use on the fifth wheel to lub it up and it worked fine for the rest of the fruit season. last weekend i was trying to get my gear shift knob threw a knew boot i bought and i didn't want to cut the boot or remove the air lines so i took the knob apart. ended up putting the hi/lo range selector switch on backwards and it started hissing as soon as the truck built up air pressure. shut the truck off took it back apart and flipped it over and it was good as new. let us know what the underlining cause is.. knowledge is power!!! share the wealth.
  6. Smalltruck

    Smalltruck Light Load Member

    Jul 3, 2010
    Elko, MN
    Check the range piston on the back of the trans.
  7. mech131

    mech131 Bobtail Member

    May 21, 2012
    FRO transmission range selector is located inside the transmission under the top cover.they're well known to leak.easy fix,low cost around 40.00 for rebuilt kit.also check the o-rings under the air module.
  8. Pablo-UA

    Pablo-UA Road Train Member

    Oct 11, 2010
    Borispol, Ukraine
    I sugest bad range valve.....
  9. EZX1100

    EZX1100 Road Train Member

    Aug 18, 2012
    i just started hearing a hissing in my shifter, right at the handle

    so it may be that i need to disassemble the handle and replace some bushings?

    where do i get the new parts from?
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