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Boom Lift salvage yard

Discussion in 'Other Construction/Demolition Equipment' started by Ronray, Sep 6, 2019.

  1. TVA

    TVA Senior Member

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  2. TVA

    TVA Senior Member

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    F3E20245-1312-4998-B84C-8FF5B20E45BC.jpeg The red arrows is check valves, the green arrow is shuttle!
     
  3. Ronray

    Ronray Well-Known Member

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    Okay I just edited the text on my last post with the picture. Sorry
     
  4. TVA

    TVA Senior Member

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    The shuttles and checks operate on pressure difference between two ports, the spring inside checks is for assistance when pressure is low on start up. The ball type shuttles don’t have springs in them because springs will interfere with ball sealing on its seat, the spool type may or may not have weak springs in them!
     
  5. TVA

    TVA Senior Member

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  6. TVA

    TVA Senior Member

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  7. Ronray

    Ronray Well-Known Member

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    Thanks TVA. I'm going to disassemble the shuttle cartridge you have pictured with the yellow arrow, and I will get a picture of all of the components at both ends and Post-it a little later for you to see to hopefully help clarify my understanding.
     
  8. TVA

    TVA Senior Member

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    By the yellow arrow I marked the counterbalance valve, not the shuttle valve, my post said: with red arrow I marked shuttle valve, OR!!! - check valve associated WITH!!! Counterbalance valve marked by yellow arrow! Because I don’t have pictures or illustrations, of all of the six sides of the block and it’s innards - I cant know for sure! But by the looks of it and proximity to components, I made two assumptions!
     
  9. TVA

    TVA Senior Member

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    The red circle - counterbalance valve

    The blue arrow - adjustment screw you can see on on picture

    The yellow circle - the check valve associated with red circle counterbalance valve.

    Now you would have to look for shuttle valve, with connections I started in post above.
     
  10. Ronray

    Ronray Well-Known Member

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    I don't see a picture with red and yellow circles?
     
  11. Ronray

    Ronray Well-Known Member

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    Okay so I am going to post some pictures of the inside of the counterbalance valve as well as pictures of all six sides of the valve block, so give me about 10 or 15 minutes to do that since I can only post three pictures at a time.

    Also I made a big discovery yesterday when I took the valve block back apart. Apparently there is supposed to be cross port leakage between the two beefy in coming forward and reverse hydraulic lines to the valve block. I removed some of the allen screw plugs and saw that there was a hole drilled connecting those two Inlet ports. And the hole was about I would say 1/16 of an inch or 1/8 of an inch in diameter.
     
  12. Ronray

    Ronray Well-Known Member

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  13. Ronray

    Ronray Well-Known Member

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  14. Ronray

    Ronray Well-Known Member

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    20190915_191922.jpg 20190915_205900.jpg 20190915_205922.jpg 20190915_205955.jpg Parts in order from inside of dynamic brake counterbalance valve shaft.

    Not sure if I have the sleeve over the piston backwards or forwards, but I think it should be with the rubber o-ring towards the outside, the right side of the picture?
     
  15. TVA

    TVA Senior Member

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    As far as I understand the top one is one of the counterbalance valves apart, the bottom three is flow divider apart.
     
  16. TVA

    TVA Senior Member

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    0CFE321D-1DC3-4B49-A5D6-D3BA5B5AB306.jpeg Is this just a plug, or there’s small spool behind it?
     
  17. Ronray

    Ronray Well-Known Member

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    Just a plug, with no spool behind it. With this plug removed I was able to see the small drilled hole connecting the two Inlet ports. And I shined a light and stuck a paperclip through the tiny small drilled hole to confirm it was unobstructed.
     
  18. TVA

    TVA Senior Member

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    Show me under what plug those parts that in the three last pictures.
     
  19. Ronray

    Ronray Well-Known Member

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    I thought this item pictured was the flow divider?

    20190328_205216.jpg 20190328_205108.jpg 20190328_205024.jpg 20190328_204107.jpg
     
  20. TVA

    TVA Senior Member

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