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final drive leak

Discussion in 'Shop Talk' started by nowing75, Mar 13, 2019.

  1. nowing75

    nowing75 Senior Member

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    Aug 5, 2009
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    796
    Location:
    coatesville indiana
    Twice in 3 months i have had a peace of equipment that was siting in the shop overnight start leaking at the seal for the final drive. First time out t455 trencher unknown hours on the final but this last time on a 336d with 7200 hours on it. it was parked in the shop over the weekend and monday i pulled it out to move to a different bay and came in tuesday and lost maybe 1/2 a quart of oil. moved machine about a foot left sitting overnight and now no leak. Just wondering if anyone else ever has had this problem. Thanks

    Jason
     
  2. 92U 3406

    92U 3406 Senior Member

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    Sounds like one of the duo cone rings cracked/broke and by moving the machine you put the break above the oil level. From what I've been told that can be caused by travelling with final drives forward and shock impacting them (ie driving fast off an RGN deck in cold temps or into a rock or stump at speed). Those duo cone rings are very brittle. An old tech once dropped an old one on the floor from waist height to prove it to me. It broke into about half a dozen pieces.

    You won't know for sure what failed until you get it apart unfortunately.
     
  3. Wytruckwrench

    Wytruckwrench Senior Member

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    Wyoming
    Could it be pressure building from warming up?
    Or as it warms up the O rings from the duo cone seals being stiff and causing a leak at a certain temperature, like a cat oil cooler leaking coolant.
     
    DB2 likes this.
  4. John C.

    John C. Senior Member

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    I've seen ice cause that more than once. Has the machine been in the cold for a long period of time?
     
  5. nowing75

    nowing75 Senior Member

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    It was in the shop over the weekend so everything should have been stable. No more leakage so going to send back in field and will check in it weekly.
     
  6. Nige

    Nige Senior Member

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    G..G..G..Granville.........!! Fetch your cloth.
    Duo-cone seals are in my experience notorious for leaking with temperature differences and/or when they are a bit old and the silicone rubber Toric Rings have taken a set.
     
    Wytruckwrench likes this.
  7. willie59

    willie59 Administrator

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    Ditto. And how many hours on those cone seals. One thing I learned by experience with crawler dump trucks was to tear down the final drives somewhere between 2K to 3K hours. Yes, pretty often one might say, but crawler dump trucks are only working when they're walking, wearing out those seals, and crawler dumps typically work in muck, that's their element. Let the cone seal go down on a Komatsu CD110R crawler dump and grenade the final drive, well, you're looking at about 24K to replace it. Me, tear it down and freshen up those cone seals. I wager the cone seal on that trencher is at the end of its life.
     
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  8. nowing75

    nowing75 Senior Member

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    coatesville indiana
    Started leaking again so we just finished up a reseal today. Thank you for your input.
     
    John Shipp likes this.