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Leaking Final Drive

Discussion in 'Excavators' started by sdavies2000, Jan 10, 2023.

  1. sdavies2000

    sdavies2000 Well-Known Member

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    If the pin doesn’t have to come out before taking the nut off, should I just leave it in there? Should be no reason to remove it from the nut then. Just reinstall the nut with the pin in it when I’m putting things back together?
     
  2. Diesel Dave

    Diesel Dave Well-Known Member

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    Yes you can leave the pin in, you will just have to allow for the pin when fabricating the tool / socket when going back together.
     
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  3. sdavies2000

    sdavies2000 Well-Known Member

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    Where are you hitting that nut with a punch? Inside one of the holes?
     
  4. Diesel Dave

    Diesel Dave Well-Known Member

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    Yes ,use the edge of a hole. Don’t get carried away, with 2 good slaps it should be evident if the nut is going to spin off freely or not. The only reason this generally works is some bearing preload has been lost due to normal bearing wear and takes some load off of the nut.
    If it doesn’t move at all then at this point you will have to build the socket.
    As has been said before by other contributors , if the nut starts to bind or lock up STOP !
    I believe it was 92U 3406 who previously posted an effective way to cut the nut.
     
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  5. Diesel Dave

    Diesel Dave Well-Known Member

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  6. sdavies2000

    sdavies2000 Well-Known Member

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    Well the nut came pretty easily With the punch.although it never came to a point where it just spun off. As soon as it came off, the spindle and motor dropped 2” and hit the bench with a thud. Scared the poop outta me. If anyone decides to do this like me, don’t make this mistake. Make sure you block it up before removing the nut! I was so preoccupied with the nut, I totally forgot to support the underside. She would have spun off easily had this been done.
    Can someone explain to me the function and purpose of each seal type? You have the big o rings as well as the metal to metal surfaces.
    How do I remove the seal that’s around the spindle without getting dirt and crap down in there?am I exposing the hydraulic side once that comes out?? There was also a “paste” I’m picking at in one of the pictures, not sure what that is.
     

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  7. sdavies2000

    sdavies2000 Well-Known Member

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    More pictures. The last one shows the seal I’m not sure how to get out without dirt getting down in there.
    Also started making up the tool to reinstall nut. Just bolts with the threaded section cut off
    One of the o rings was split as well.
    If anyone wants pictures of anything else, let me know
     

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  8. Diesel Dave

    Diesel Dave Well-Known Member

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    Have you made a decision to replace the (2) bearing sets or no ?
    Take pics of both bearing races in the sprocket hub.
     
    Last edited: Jan 24, 2023 at 7:37 PM
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  9. Nige

    Nige Senior Member

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    The root cause of your leak is right there. That isn't an O-Ring, it's what is known as a Toric Ring and it provides the "spring force" to keep the two metal face seal rings in contact with one another. Lose the spring force, no contact, seal leaks..........
    The faces of the metal rings are worn out as well BTW.

    upload_2023-1-25_0-47-0.png
     
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  10. Nige

    Nige Senior Member

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  11. 92U 3406

    92U 3406 Senior Member

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    Website is being glitchy AF right now so I can't zoom in on any pics.

    That metal paste is just accumulated wear particles. If the gears and other hard parts are still in reusable condition then just clean it up and don't worry about it.

    No need to worry about dirt getting into the hydraulics, the motor is a sealed unit. Just pop the duo cone assemblies out and clean up all the crud. May need to get into the groove the toric sits in with a wire brush on a die grinder to get any rust and debris off the surfaces.
     
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  12. 92U 3406

    92U 3406 Senior Member

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    If the proper install tool for the duo cone seal is not available to you, a length of synflex air line between the toric ring and the flange of the metal face seal will help keep the toric ring from rolling up on you.

    It can be a bit of a chore to get them installed without the proper tool but it is doable. Just take your time.
     
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  13. 92U 3406

    92U 3406 Senior Member

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    Also looks like there's a crack in the one metal ring in the first batch of photos.
     
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  14. Nige

    Nige Senior Member

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    Good eye. I also think that’s a crack.
     
  15. sdavies2000

    sdavies2000 Well-Known Member

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    I hadn’t made a decision on the main bearings themselves yet, but they don’t seem bad? Pictures of the races attached.

    Great eye! I hadn’t noticed that crack yet. There’s actually two cracks in that ring. No crack in the sprocket side which had the bad toric ring.

    Nige, thanks for the explanation.that makes perfect sense, such a simple but clever design. Thanks for posting the link to willies instructional too, that’s an amazing resource to someone that’s never done it before.
    That video helps a lot too.
     

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  16. sdavies2000

    sdavies2000 Well-Known Member

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    More
     

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  17. 92U 3406

    92U 3406 Senior Member

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    Bearing races look questionable to me based on the pictures. Being this far into it I'd replace them.
     
  18. Nige

    Nige Senior Member

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    Sometimes it's hard for people without experience to get their heads around the fact that the Toric Rings are fixed in position on the ramps and actually grip the ramps and "roll" to a certain extent as they are being installed. See this thread, in particular Post #8, for more info on how those seals work and why: -
    1. Everything has to be cleaned with alcohol before installation and the same alcohol is the only permitted "lubricant" to use during installation.
    2. The surfaces of the ramps on both the metal ring and on the housing MUST be rough otherwise the Toric Ring will not grip on them as designed when the seal is being installed.

    https://www.heavyequipmentforums.com/threads/941-bottom-rollers-rebuilds.74258/
     
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  19. Nige

    Nige Senior Member

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    I'd say they are more than questionable. Check out the marks of the rollers on the bearing cups. Those surfaces should be bright like a mirror, not dull. If you had a new bearing in your hand at this moment you'd see the difference straight away.
    New bearings (cups & cones) needed.
     
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  20. John C.

    John C. Senior Member

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    That paste is like lapping compound. You should dismantle the planetaries and check the thrust washers and bearings while you are in there.
     
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