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  1. jnmaney

    Circuit problem

    I did add gages to both sides of the cylinders in question and do not see any back pressure at the gages.
  2. jnmaney

    Circuit problem

    Just checking, boss said if there was backpressure causing the cyl to open you could confirm by cracking loose the line. Idle = no call for a or b to open.
  3. jnmaney

    Circuit problem

    I cracked the fittings at the cylinders at device 2 and found there is pressure at one side. at idle should this be or no ? Also followed the drain line back to tank and it's a long distance, plus connects to other tank lines converging and going back to tank. at one point it takes a 90 and goes...
  4. jnmaney

    Circuit problem

    hydromech- leakage thru the #2 valve...for sure because tools are falling out of the arm that is supposed to be locked when a or b are supposed to be turned off (cylinder retracts when pressure off ). I could hook up a gage but i know there would be some pressure. Hydtools- adding a check to...
  5. jnmaney

    Circuit problem

    oh and yes 2a and 2b do not function at the same time.
  6. jnmaney

    Circuit problem

    Thank you very much. I'm following you so far. I will try and see what can be done on the back pressure issue.
  7. jnmaney

    Circuit problem

    Please have a look at this circuit and see if you can give me some advice. The device labeled 2 is the one in question. This is a valve supplying fluid to 2 small cylinders. cylinders extend and allow fingers to locate on a machine tool holder. When valve is off cylinder retracts and locks onto...
  8. jnmaney

    5 axis CNC machine

    What is the price for the Haas ?
  9. jnmaney

    NSK Vogel US Distributor

    I need a part for a NSK Vogel spindle bearing lubrication system. Can anyone tell me of a US distributor for this product line ? Thanks, John
  10. jnmaney

    Counter Balance Circuit Problem

    Just making an update to this thread. I did remove the manifold the checkvalve is mounted to and all piping connects to. The checkvalve drain line is correct to drawing and seemed good. Shutting off system now works fine most of the time. Have no idea how condition improved but is not fixed for...
  11. jnmaney

    Counter Balance Circuit Problem

    Thanks for your replies. I am not at a point yet to do any digging on the system. The response I am getting from engineering is that this is a issue they don't see very often. They do say reversing the pump is not good. This is a system that is on a number of our machines and works fine. I have...
  12. jnmaney

    Counter Balance Circuit Problem

    I will check the pressure. Last time a tank was low the up stroke pressure was really fluctuating ( not able to assist heavy demand ). One procedure I got on this job was how to set up the pressure reducing valve. Turn in the valve to almost closed, then open till you see pressure drop, then...
  13. jnmaney

    Counter Balance Circuit Problem

    I think the only thing that improved was the check valve is closing everytime but there is still issues. it drops to zero first which is unusual. the inrush sound is even of concern to the customer as it is so loud. I see where the check / pressure reducing valve drain seem to be tied into each...
  14. jnmaney

    Counter Balance Circuit Problem

    Regarding the gage, it reads in Mpa's, Help me with the x y are you looking at the 689 jpeg which shows dr 2 coming out on both sides of the manifold? Really appreciate the help.
  15. jnmaney

    Counter balance system

    Thanks Hydromech, I don't think the drain is tied into the pressure / return lines going out to the Y cable carrier. attached pic which shows the check valve mounting surface.
  16. jnmaney

    Counter Balance Circuit Problem

    hydromech replied : Sound very much like the PO check valve is slow to close... While the check valve is open, gravity induced load on the cylinders is pushing oil back through the system, motoring the pump. When the PO check valve eventually closes, the pressure rises because of the load on...
  17. jnmaney

    Counter balance system

    Sound very much like the PO check valve is slow to close... While the check valve is open, gravity induced load on the cylinders is pushing oil back through the system, motoring the pump. When the PO check valve eventually closes, the pressure rises because of the load on the cylinders. The...
  18. jnmaney

    Counter balance system

    Here is a picture of the check valve mounting surface
  19. jnmaney

    Counter Balance Circuit Problem

    I have a system i want to get some advice on. Large milling machine, hyd system = counterbalance circuit : 2 counterbalance cylinders, pilot operated check valve, pressure reducing valve and a nitrogen charged accumulator. 1 additional pressure line going out to 1 other area of machine. My...
  20. jnmaney

    Counter balance system

    see valve pictue . Cylinders are oriented as shown in schematic, rod end pointing down. System is designed so cylinders hold the load so motor can work up / down without lot of effort. Check valve will hold system pressure when hyd off for saftey to hold load in event motor brake not able to...

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