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  1. Z

    Cat 277B RH park brake not releasing

    I put a few hours on it today. Been busy trying to get our new septic holding tank to stop leaking. It worked great. I will plan on replacing the filter again and checking out what the inside looks like before I change the fluid again. Yes I put in new fluid. I never could quite bring myself to...
  2. Z

    Cat 277B RH park brake not releasing

    Sounds like a good idea. I was actually thinking of just draining the fluid and changing the filter after a few hours, but it would make more sense to see what is in the filter. Thank you.
  3. Z

    Cat 277B RH park brake not releasing

    In case anyone was interested. I got a new drive motor from TLP. Even has a CAT label and s/n on it. Took apart the filter, found maybe 10 flakes of metal total, so I did not completely disassemble and flush the system. Drained, flushed tank, flushed lines to motor. Filled with new fluid/filter...
  4. Z

    Cat 277B RH park brake not releasing

    Broke the damn arm cylinder rod on my excavator. Not good timing for the amount of work left to do before winter or the amount of money we have left to spend on it. Luckily it has been raining the last few days. Have to call tomorrow to see how much it is going to cost to get that fixed.
  5. Z

    Cat 277B RH park brake not releasing

    I drained the oil into a clean tub, nothing sparkling. I haven't taken the filter off yet, but I think that is a good start. Hopefully there isn't a pile of shavings hiding in the bottom of the tank. Thank you again.
  6. Z

    Cat 277B RH park brake not releasing

    Do you have any suggestions as to how in depth I need to go for flushing? Is it a type of system and failure that needs the tank removed and cleaned, all lines disconnected and flushed, cylinders passively moved and flushed, etc? Or can I drain the tank and fill with diesel, run everything...
  7. Z

    Cat 277B RH park brake not releasing

    Took it apart today. Not going to work. A piston was stuck and broken in the bore. Ring was all scored. I'm guessing it would cost as much for the pieces as a motor. Put it back together and will call Monday to see about a replacement. Thanks for all the help.
  8. Z

    Cat 277B RH park brake not releasing

    Thank you very much. I think I'll gove Ziegler a call in the morning, tried this morning, didn't work. But I'm glad I had to wait. I didn't see anything special so I'll give the rebuild a shot. Unless i find worn/broken parts, I expect it to work.
  9. Z

    Cat 277B RH park brake not releasing

    My serial # is MDH01949. I think the part number for the motor is 280-7864. What you said make sense. If there is fluid movement, which there definitely is, it could only be charge fluid flowing. If a seal inside the motor let loose and is causing some pressure to build in the drain circuit...
  10. Z

    Cat 277B RH park brake not releasing

    I have a lot of experience with component rebuild. Mostly automotive. There isn't much on a pickup I haven't rebuilt. I've rebuilt starters, alternators, turbos, steering gears, steering pumps, axles, transfer cases, transmissions, engines, truck transmissions, truck engines, truck axles, and...
  11. Z

    Cat 277B RH park brake not releasing

    Thank you very much. If I understand correctly, my problem is not simply a failed seal in the park brake portion of the motor. It is likely a larger failure inside the motor allowing the charge fluid to return through the case drain/flush line. Does that mean I need a new drive motor? Can...
  12. Z

    Cat 277B RH park brake not releasing

    Thank you. As far as I know and can tell, there is no separate final drive fluid. It would be nearly impossible to check it. That diagram helps a lot, but gives me another idea I'll try to explain below. Could you post the rest of that diagram, or where the green dashed line goes to at...
  13. Z

    Cat 277B RH park brake not releasing

    I've searched everywhere and can't find the information I need. You can skip story and go to the next paragraph if you don't care how it happened. I'm in the middle of installing the drain tile system around my wife's new building. I've prepped two sides, and started putting in the washed...
  14. Z

    Komatsu PC50MR-2 Slow Swing

    If anyone was wondering, these excavators use a main piston pump with two separate output lines to run everything except the swing, blade, and control circuits. The swing and blade are run by a gear pump through the main pump housing. The control circuit is also run by the gear pump, but off...
  15. Z

    Komatsu PC50MR-2 Slow Swing

    Thanks for the help. In-case anyone was wondering, it was the gear pump. I tested and cleaned many parts, with no change. Finally took a chance and just ordered a new gear pump. Took a while to find the correct parts diagrams (mainly because I wasn't familiar with the komatsu part lookup)...
  16. Z

    Komatsu PC50MR-2 Slow Swing

    I just purchased this Komatsu Excavator. I noticed the swing speed was a little slow. Measured and it is about half the rated speed. Did some research and found the swing and blade are driven off the same section of the pump. Checked the pressure and found the swing at 12Mpa where the spec...
  17. Z

    Aftermarket CTL tracks

    I need a track for my 277B, the drive lugs ripped off one of mine. It had lots of tread left, not sure what brand it was, but I'd like for that not to happen again. I only use it for my house, doing landscaping and loading sandy gravel for myself. Personal use, not a business. I've had it a...
  18. Z

    580c Extra Oil

    Finally got the pump back on after TPG's rebuild. It ran great. Looking forward to getting my digging done.
  19. Z

    Yard Leveling

    I've done a bit of landscaping around my place. I got a nice even slope, no more standing water when it rains, and have it fairly smooth. I've used my MTL and attachments for most of it, with the help of a spike tooth harrow and leveling drag behind the ATV. Now I'm down to finishing it and I...
  20. Z

    580c Extra Oil

    Sorry I went camping, got home last night. Finally got a chance to look at it. It is confirmed to be full of diesel. I've only had it a little while, but done a lot to it. Repacked most of the cylinders, replaced water pump, thermostat, belt, many other seals. I cleaned the fuel tank and...
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