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  1. M

    Kubota KX80-4 Thumb cylinder drops

    I finally got to my exavator and i popped out the relief valve. It was stuck open. pushed it back in and I'm back in business. Thanks for the guidance.
  2. M

    Kubota KX80-4 Thumb cylinder drops

    Yes, exactly, that is my thought as well. I've looked at the valve bank and determined that is either one of those valves that is in question. I suspect it is the one with 5 and 6 reference numbers because it is the only relief valve that has some of the gray paint broken off like it has been...
  3. M

    Kubota KX80-4 Thumb cylinder drops

    Thanks for responding Uffex. I got the machine back to the farm and switched the cylinder hoses to the other auxiliary lines and the cylinder works perfectly. I assume my relief valve is not working properly. Is that a safe assumption? On the original auxiliary lines, with the relief valve...
  4. M

    Kubota KX80-4 Thumb cylinder drops

    Aloha and thanks for checking this post out. I hope that someone will be able to give me a good lead to fix my hydraulic issue. I was operating my 2018 machine yesterday and all of a sudden the thumb fell down while I was using the bucket. It didn't slam down, but gradually fell making the...
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