Hello, I’ve got A10V pump with power control (DFLR). When I tried to adjust it, nothing changed. How does it work? As at full load a motor trips on overcurrent
Great explanation, I see the control valve has changed from tandem (1yr ago) to float.I have tandem but have bought a counterbalance valve to install (loader always drops before it goes up,not good). Will it work? and why....these seem to be a bit of a tricky beast.
When You just let the parts fall uncontrolled after opening the valve You do not know the way they were inside and the mistake can be made while assembling it back :(
if a swing of a crane rotates with the required speed in one direction and does not do fot the onother direction .. when we measure the pressure in the dcv it reads 50 bar in on direction and 40 bar in the other one ..so what may cause this pressure drop ??
The dude maybe knows what he is talking about, but in the era of multimedia, on YT actually just talking about how should it sound or how should it look like is so weak... And the dude just can't wait to go have a leak (or maybe too much coffee in the morning) my eyes hurt from following him on the screen... Or maybe his trousers are burning - there's some kind of smoke behind... Anyway - the best he could do was taking the filter to his hand from the table and putting it back even without explaining what should we look for in this image... National experts... Pfff...
Great presentation, one question please. Once the pressure reaches 500 PSI and the pressure relief valve activates does the line pressure indicated on the gauge become zero PSI. I assume an closed relief valve will not hinder free flow? Maybe zero for a brief sec when over 500 PSI is reached?
Thank you for your kind comment and question. No, pressure does not return to 0 PSI once the relief valve opens, even for an instant. The resistance must continue to be overcome after the relief valve opens. Think of it as you holding a spring between your thumb and forefinger. When you compress the spring, you must continue to apply that force after it compresses, otherwise, it will stretch back out. The spring in the relief valve is the same way. In fact, if you install a second relief valve in the tank line of the first one, it will take the sum of the two spring settings to open them and keep them open. Many systems have this exact arrangement to remotely set a relief valve in an unsafe or inconvenient location. Hope this helps!
Not necessarily. It would depend on the total amount of flow delivered to the piston side. If the hose was already at its flow limit without regeneration, then yes, it is possible that the regenerated flow from the rod side could make the flow exceed the rated amount.
This is great! Thanks for sharing, im 23yo from sweden and have built my own hydralic press. 5 inch piston, double acting cylinder that i found att the scrapyard. Right now i am done with the heavy frame and trying to get a grip on the plumbing. You sir have helped me out more than you'd imagine Thanks again!
hi i need your help me one of our electric forklift aisle master when driver lowering the cargo mast starts shaking help me to finguring out the root cause
Sounds to me like your counterbalance valve is improperly set. As the cylinder is going down, if it is safe to do so, adjust until you find the exact stall point. Then lower the pressure about 1/4 turn. Hope this helps!
hi i need your help me one of our forklift has the problem when the driver lifting the cargo at lowering the master starts to shaking please help me to finguring out the root cause
hi i need your help me one of our forklift has the problem when the driver lifting the cargo at lowering the master starts to shaking please help me to finguring out the root cause
Recently purchased 2008 cat287C MTL. At anything less than full throttle it will start to move forward then gradually slow. With full throttle it will move out but if you start uphill it will slow down. I have not performed pressure check. Did dissect the filter after replacing and it had no metal filings or other debris inside. Any suggestions?
Thank you for your question, Mark! Your problem sounds very similar to the one addressed in the episode. Have you in fact checked the crossports? You seem to be losing flow from SOMEWHERE, and the crossports would be a good place to start. Presumably the fluid isn't leaking onto the ground, or you would have likely mentioned that, so it must be leaking internally going from a higher pressure to a lower pressure (taking the path of least resistance in other words). This could, of course, be any component in the circuit that could develop a path from a pressure line to a return line, but check for bypassing in the control valve, the crossports, the system relief, and the hydraulic motor. Remember that pressure drops that don't do any work generate heat, so look for any component that has a temperature gain. Good luck with your troubleshooting and I hope this helps!
Hello sir... Can you help me to solve a problem...? My solenoid valve making too much sound and vibration... I opened it and clean it but problem is still there... Can you please tell me the solution of this problem...
Great video! Does the ratio of the cylinder need to be 2:1? I have a 4” bore 1.75” rod cylinder for a log splitter that I wanted to add a regenerative circuit to but read that it should be a 2:1 ratio for the circuit to work, is this the case?
Thank you for your comment and question! No, the ratio need not necessarily be 2:1. Naturally, the greater the difference in surface area, the more pronounced the effect will be, but regenerative flow works with any cylinder (except a double rod cylinder with both rods the same size).
Thank you for the kind comment! No, I only have training for troubleshooting them - repair is not really recommended in the field because of the cleanliness requirements. Most places aren't set up for it.
Hello sir, Myself Ajit Nayak from INDIA, I have Rexroth A10VSO100-DFLR-31R pump. before few days my team replace rotary kit in this pump. i request to you pl. guide me to set up Pressure, Flow control as well as load sensing valve optimum setting. my CNC machine required pre. is 3200 PSI, 50HP Motor using in this system. Thanks GPM Hyd. Team.
Thank you for your question! I presume you are talking about protecting your expensive gauge from the shock in the system. The gauge is one of your most valuable troubleshooting tools, so it is crucial that it be taken care of. There are two common ways to do this. The best is a gauge isolation valve. This is a three-way pushbutton type valve that releases pressure from the gauge whenever it is not actively being read. You push the button and read the gauge, then when the button is released, pressure is drained to tank and the gauge drops to 0. Second best is a "snubber". This is a small, variable orifice flow control that you crack open when reading the gauge. By metering the flow to the gauge, spikes are eliminated. The gauge response is tempered, keeping it from damage while allowing the pressure to be read. Once you are finished monitoring the pressure, close the snubber, locking pressure in the gauge and isolating it from the system. Hope this helps!
Thanks for the reply, although what I meant was if pressure testing were to be done near to the pump, one would have to shut off the valve nearest to the pump yes? In that case, pressure acceleration would be extremely quick and likely destroy the pump, so how does one test for pressure near the pump safely?
OK, I think I see what you mean now. It is true that, in order to get a reliable pressure setting, the pump needs to be deadheaded. This is best done by blocking flow to everything in the system EXCEPT the system relief valve. If you are checking pressure with a fixed displacement pump, the pressure in the system will be determined by the relief valve. If your purpose here is to test the condition of the pump, you should also have a flow meter installed either upstream of the relief valve or in the relief valve tank line. Check the amount of flow first with the relief valve adjusted at a very low pressure. In this case, even a badly worn pump will deliver all or nearly all of its rated flow. Now, begin to slowly increase the pressure while monitoring the flow meter. If the pump is any good, there will be little if any change in the flow once you have reached normal system pressure. If, however, the flow drops more than ten percent, the pump is becoming worn and will soon need to be replaced (depending, of course, on the system flow requirements). If you are checking a variable displacement pump, the procedure is the same except that the pressure adjustment on the pump must be higher than the highest setting on the relief valve. This ensures that the relief valve is determining pressure rather than the pump, giving a reliable indication of the pump condition. In no case should a system be operated WITHOUT a relief valve. I have seen system designs with no relief valve, operating on the assumption that the pump regulates pressure so there is no need for a relief valve. This is dangerous, because the pump's pressure compensator valve can stick either open or closed. Depending upon the pump design, one way will keep any pressure from building in the system, the other will keep the pump at full stroke all the time, causing it to perform as a fixed displacement pump. Hope this answers your question!
Watched this April 2021. I am an EE trying to understand counterbalance valve. The best video so far out of all the videos I watched to understand counterbalance valve. Great instructor Thank yhou
Thanks for your question! There is always a return line connected, but you can’t see it because it goes to the pump case and returns to tank through the case drain.
What i mean to say is that what If there is no load Sense signal hose is connected to pump? Then what is affect of tightening and loosening of load sensing setting screw
@@guruv1870 , Oh, OK, I see what you mean. If there is no load sense signal applied, the compensator valve setting will override the load sensing setting. Sorry, I misunderstood your question. Quite often, these pumps are specified by the designer because of their efficiency even though the load sensing feature is not needed.
