Check the hydraulic schematics, trace the path from the pump to the actuator, how many valves are there, what kind. Take into account that there are some components that are common for different movements http://www.jindajx.com/ or actuators, like pumps, relief valves, some directional valves, some flow controls.
At this point, after comparing notes you should have in your mind two or three or even more possible causes. Now is the moment to act. Lets say you have two possibilities, and then you need to think in how you are going to perform a test to disprove or confirm one of them. To do so, you need to isolate the hydraulic element and use a Flow meter with pressure gauge and load valve built in (relief valve). For example: if it is a pump you are trying to eliminate, you connect the flow meter direct to the outlet, start the machine and check the flow, first without load and then with it, closing the load valve. If the reading of the flow at max pressure (setting of the machine) is around 90% of the flow without load we can say that the pump is good, so the problem is caused by the other element.
Off course, all of the actions I described above are quite general, but the idea is that in order to discard or confirm that a hydraulic element is the cause; you need to follow the path from the pump to the actuator that stopped and perform the flow and pressure test adding an additional element like the relief valve after the pump, and so on until you get to the cylinder.
In brief, hydraulic troubleshooting is difficult but with the hydraulic knowledge, machine information and equipment (flow meter) is much easier and definitely much faster. The last one is relatively easy to get, the second one is easy depending on the manufacturer, and the first one is going to take more time but is the most worth it.
Note: If you do not have a Flow meter, you can use a 5 gal bucket to discharge the flow with a relief valve and gauge timing with a watch, for example: If the bucket is filled in 15 secs, the flow is 5 x 60/15 = 20 GPM.
At this point, after comparing notes you should have in your mind two or three or even more possible causes. Now is the moment to act. Lets say you have two possibilities, and then you need to think in how you are going to perform a test to disprove or confirm one of them. To do so, you need to isolate the hydraulic element and use a Flow meter with pressure gauge and load valve built in (relief valve). For example: if it is a pump you are trying to eliminate, you connect the flow meter direct to the outlet, start the machine and check the flow, first without load and then with it, closing the load valve. If the reading of the flow at max pressure (setting of the machine) is around 90% of the flow without load we can say that the pump is good, so the problem is caused by the other element.
Off course, all of the actions I described above are quite general, but the idea is that in order to discard or confirm that a hydraulic element is the cause; you need to follow the path from the pump to the actuator that stopped and perform the flow and pressure test adding an additional element like the relief valve after the pump, and so on until you get to the cylinder.
In brief, hydraulic troubleshooting is difficult but with the hydraulic knowledge, machine information and equipment (flow meter) is much easier and definitely much faster. The last one is relatively easy to get, the second one is easy depending on the manufacturer, and the first one is going to take more time but is the most worth it.
Note: If you do not have a Flow meter, you can use a 5 gal bucket to discharge the flow with a relief valve and gauge timing with a watch, for example: If the bucket is filled in 15 secs, the flow is 5 x 60/15 = 20 GPM.
コメント