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Cat d4d transmission input shaft seal replacement

Discussion in 'Dozers' started by Quadzilla, May 14, 2022.

  1. Quadzilla

    Quadzilla Member

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    Does anyone know if you can just undo the rubber briskets and slide input flange out and replace the seal? Or do you have to remove torque converter cover and install it from inside of the cover? Serial number on dozer is 83j-3795
     
  2. Glum

    Glum Active Member

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    Yes, you can replace the seal in place.
    It's a bit of a tight spot to get the new seal in.
    Easiest is to make a tool to pull it into place.
     

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  3. Quadzilla

    Quadzilla Member

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    Ok, thanks.
     
  4. Quadzilla

    Quadzilla Member

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    Those bolts that go in around the seal don’t hold anything inside??
     
  5. Glum

    Glum Active Member

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    Yes, they do hold a carrier in place to the outer casing, but it can't fall away when you remove the bolts. Be aware that those bolts are not concentric around the center.
    You can also use a flat bar with just two holes and something like an old bearing shell to pull the seal in.
    I have managed to tap a seal or two into place over the years but its a gamble in that awkward space and you'd better have a spare seal on hand.
     
  6. Quadzilla

    Quadzilla Member

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    Got one more question for you, it has a winch and a logging type roller assembly on the back, do you have to remove all of that to adjust brakes and steering clutch’s??
     
  7. Glum

    Glum Active Member

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    No experience with winches here, but it appears there is no access from the back with them attached.
    You can still gain access to do the settings from the covers under the seat with a little more difficulty, so no need to remove the winch.
     
  8. Quadzilla

    Quadzilla Member

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    Ok, thanks, I am going to have to get a service manual, don’t know how much free play there should be on the peddles?
     
  9. .RC.

    .RC. Senior Member

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  10. Quadzilla

    Quadzilla Member

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  11. Quadzilla

    Quadzilla Member

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    Well, got the seal out, and looking in there at the bearing it appears that the bearing is bad. Looks like it is missing about half of the ball bearings. Can a person remove the torque converter cover without removing the transmission or has this just turned into a major job?
     
  12. Glum

    Glum Active Member

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    I seem to remember someone on one of the forums trying that some years back, but can't recall the result.
    I would recommend dropping out the whole converter and rebuilding it as the other bearings have probably taken a pounding too. Not a huge job, just a bit of a squeeze to get it in and out.
     
  13. Quadzilla

    Quadzilla Member

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    Ok, the manual shows taking out the entire transmission, was just hoping to avoid that if at all possible. Is tha input shaft connected directly to the converter or does it slide off of converter and come out with the front cover??
     
  14. Glum

    Glum Active Member

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    You don't have to remove the transmission. You would split the converter from the trans at the 2nd row of bolts (holding the entire converter to the transmission casing), not the bolts which hold the front cover of the converter in place
    Splines connecting the t/c to trans. The t/c shaft goes about 2'' into trans.Also 2 short steel tubes between t/c and trans control valve which will give you a bit of grief.
    Best is to put the machine on blocks to give more clearance underneath.
     
    Last edited: Jun 20, 2022
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  15. Quadzilla

    Quadzilla Member

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    .
    Ok, have it sitting on 4x12 Timbers. Hope that is enough! Thanks for the help! I will keep you posted.
     
  16. D6 Merv

    D6 Merv Senior Member

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    very wrong; that late a serial number will probably have the live drive pto attachment. And converter can not come off in place.
    Converter and trans has to come out in one piece.
    Does it have the pto drive disconnect lever down by your left heel. ? That you use to disengage drive to the tracks when using the winch ?? If not and you just pull on the winch lever to start winching; then it has the live drive setup.
    Live drive has a long shaft that is direct drive off the transmission pump gear.
    A completely different PTO design to any other cat crawler. Trust me i have been in there on my D4E which has same setup.
    Unless of course it has a hydraulic winch driven off the crawler hydraulics ? But if its a Cat 54 winch or hyster W5A or B then it is pto driven
     
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  17. Quadzilla

    Quadzilla Member

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    I believe it has a hydraulic winch, appears to have two lines coming from hydraulic pump on motor back to the winch. Only lever on the floor is brakes and Parking brake lever. And decelerator pedals.
     
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  18. Glum

    Glum Active Member

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    Merv is 100% correct if it has the pto setup.
    Apologies, that didn't even cross my mind as winches are almost non existent on these machines in my part of the world. Most came with a no4 ripper as standard equipment.
     
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  19. D6 Merv

    D6 Merv Senior Member

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    Do you know what model winch it is ??
    Cat 54 winch has winch pump driven off timing gear case on LHS. But this is NOT a hydraulic winch. That pump provides power to engage forward clutch, and also to release brake. It is a PTO winch.
     
  20. Quadzilla

    Quadzilla Member

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    Any way to tell what model of winch it is? Just see a couple part numbers on it. I do believe it is a cat winch. Has a little site glass on lower right hand side. Hydraulic lines coming from a pump on engine.