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D7G keeps blowing torque converter output seal

Discussion in 'Dozers' started by 02Dmax, Feb 14, 2016.

  1. 02Dmax

    02Dmax Senior Member

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    D7G 92V prefix.

    I had the torque out of this thing a few months back to replace the rear main seal that was letting engine oil transfer. Ever since then it has been blowing out the seal at the output yoke. I've replaced the seal 3 times and also replaced the yoke. I'm assuming I boogered something up when I had the torque out but not sure what. I didn't dismantle the converter at all. Just pulled it off, cleaned it up, and put it back on. Any ideas?
     
  2. Nige

    Nige Senior Member

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    Did you by chance take any TC pressures while you were working on it..?
     
  3. oldirt

    oldirt Senior Member

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    converter drain pump failed or worn out?

    is the the same tractor you r&r'd the final a while back?
     
  4. 02Dmax

    02Dmax Senior Member

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    No, I haven't checked any pressures on it.
     
  5. Bob/Ont

    Bob/Ont Senior Member

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    Might have a broken cast iron sealing ring near the back of the torque. Need parts pic to tell.
    Later Bob
     
  6. 02Dmax

    02Dmax Senior Member

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    Ya, I went through one of the finals about a year ago.
     
  7. 02Dmax

    02Dmax Senior Member

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    When it goes out its a severe leak. It's actually blowing the the lip of the seal out of the tin case of the seal.
     
  8. Nige

    Nige Senior Member

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    So it's not blowing the complete seal assembly out of the housing..?
    Genuine Cat seals or "will fit"..? Just to rule out a possible material issue.
     
  9. Bob/Ont

    Bob/Ont Senior Member

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    The cast iron rings hold the charge inside the converter. If the rear one breaks a lot of force will be on the back seal.
    Later Bob
     
  10. Nige

    Nige Senior Member

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    Bob, Are you talking about the 2 metal sealing rings #4 in the diagram below...?

    D7G Torque Converter.png
     
  11. Bob/Ont

    Bob/Ont Senior Member

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    They might be the ones Nige, could you show me a pic of the shaft Please?
    Later Bob
     
  12. Nige

    Nige Senior Member

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    This is the best I can do for the shaft .......

    D7G Torque Converter 2.png
     
  13. Old Magnet

    Old Magnet Senior Member

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    What leaks past those rings is open to the housing.
    The diagrams are for D6C but the G is the same.
     

    Attached Files:

    Last edited: Feb 14, 2016
  14. Bob/Ont

    Bob/Ont Senior Member

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    What is #6 in the last pic you posted Nige? Was looking for a shaft ring but can't see it on OM's pic's. Failing that it might be a plug left in a cooler line forcing the pressure up to inlet relief setting.
    Later Bob
     
    Last edited: Feb 14, 2016
  15. Old Magnet

    Old Magnet Senior Member

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    #6 is a split metal ring. Looks to be retaining ring for bearing race #5
     
    Last edited: Feb 14, 2016
  16. Nige

    Nige Senior Member

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    OM, It is a split metal ring, but it doesn't retain the bearing, in fact it's a split ring rotating shaft seal.
    Bob, Here's an illustration of a TC from a D6R that uses the exact same 9M-2008 split steel ring seal that is used in the OP's 92V-prefix D7G.

    D7G Torque Converter 3.png
     
  17. Old Magnet

    Old Magnet Senior Member

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    OK, I see it in my D6R parts manual. Called out as a ring-metal seal. Looks like that could be the culprit if damaged.
     
  18. 02Dmax

    02Dmax Senior Member

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    Genuine Cat parts. I do believe I put a Cat Classic yoke in it though.
     
  19. Heavey Metal

    Heavey Metal Well-Known Member

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    Might as well overhaul the converter

    If you need more convincing do the pressure test and a stall spilltest and see how much oil its making.
     
  20. tctractors

    tctractors Senior Member

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    If the seal is blown don't bother with any pressure test just move on to the next point, strip out the converter as its going to have problems, often the shaft can move out of the converter towards the tran's due to thrust wear eating into the S/Pump drive gear face, this puts 1 of the steel seals outside the location, anyhow its going to need a full strip out.
    tctractors

    p.s. remove the S/Pump before the cover is pulled.