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955K shifting

Discussion in 'Track Loaders' started by tomb76131, Sep 14, 2018 at 12:23 AM.

  1. tomb76131

    tomb76131 Member

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    Just changed all the fluids, filter, cleaned the screen and magnet now she shifts into all three forward and reverse gears, you can feel the shifts, but it doesn't change speeds only looses power by being in higher gears. She was fine until I changed everything. Ideas??
     
  2. Theweldor

    Theweldor Well-Known Member

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  3. tomb76131

    tomb76131 Member

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    complete fluid change and all filters including fuel
     
  4. tomb76131

    tomb76131 Member

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    Trans temp and pressure are running in the green on the gauges
     
  5. Nige

    Nige Senior Member

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    What type and weight of oil did you put in the transmission..?
     
  6. tomb76131

    tomb76131 Member

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    30 weight caterpillar
     
  7. Old Magnet

    Old Magnet Senior Member

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    Was that 30 wt TDTO TO-4 spec?
     
  8. tomb76131

    tomb76131 Member

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    Went by the book
     
  9. sawmilleng

    sawmilleng Well-Known Member

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    Hi, Tomb,
    I came across a similar situation with my D4D some time back. When I got it, the powershift seemed weak, like it had a sloppy torque converter. It wouldn't even spin the tracks in low when going up against a tree. Trans pressures were fine.

    Finally had to pull the thing apart 'cause a engine liner got a pinhole through into the water side.

    Pulled the whole transmission/torque apart into little bitty pieces.

    The only thing I could find wrong was the torque/trans pump intake screen was plugged nearly solid. The previous guy was a gyppo logger and had brazed up a crack in the torque housing without taking it out of the machine. I presume he drained the oil but the brazing had carbonized a bunch of oil in the torque. It cracked off the inside and plugged the pump intake screen.

    I can't say for sure this was the problem in my machine because I haven't got it back running yet but I went through the torque with a fine tooth comb--even bribed a Cat guy (with lunch) to give me the wear limits on the torque to prove to myself it wasn't worn out! The rest of the transmission was fine.

    I'm presuming the transmission was sluggish because the torque wasn't getting enough oil into it to make it work properly.

    Hope this helps....

    Jon.
     
  10. Old Magnet

    Old Magnet Senior Member

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    Time to run some pressure checks!
     
  11. Nige

    Nige Senior Member

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    I think so........... a Serial Number would assist in locating the correct specs for the power train.
     
  12. tomb76131

    tomb76131 Member

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