How we can easily diagnosed the problem of a hydraulically operated machines?
Answer:
*In any troubleshooting situation, no matter how simple or complex the hydraulic system, always start with the basics. This ensures that the obvious is never overlooked. In order for the 'obvious' to be obvious, the fundamental laws of hydraulics must be kept in mind:
Hydraulic pumps create flow - not pressure.
Resistance to flow creates pressure.
Flow determines actuator speed.
Pressure determines actuator force.
Fluid under pressure takes the path of least resistance.
When fluid moves from an area of high pressure to an area of low pressure (pressure drop) without performing useful work, heat is generated.
Theory is great, but it always makes more sense when put into practice. So let's apply these fundamentals to the above situation in a way that ensures the obvious things are not overlooked
*Perhaps not suprisingly, external leaks featured strongly ,a biggest problem in the survey results. While the nuisance-value of leaks is well understood, their real cost is often overlooked. Those leaks you have been meaning to fix could be costing you a small fortune.
*Overheating was another problem high on the list.
*Internal leakage (wear) was another major concern. While all hydraulic components will wear out eventually, an effective maintenance program is the key to maximizing component life and minimizing operating costs.
*The findings of a three-year study of 117 mobile and industrial hydraulic machines to determine the correlation between fluid cleanliness and breakdown frequency, has shown that maintaining fluid cleanliness at ISO 4406 14/11 will result in a tenfold gain in the average time between breakdowns when compared with a fluid cleanliness level of 22/19.
*pl. check all aspects:
http://www.airlinehyd.com/training/hydra...
If you mean mechanical problems in Hydaulic machines, then vibration-diagnosis is a very good technique. A healthy machine has a certain vibration pattern. When a defect occurs, there is a distinct change in the pattern. You can then know that there is a defect. To know the nature of the defect, you have to see the vibration-spectrum, that shows you the frequencies of vibration. These things can be done in an instrument called the "vibration-analyzer".
You need the service and repair manuals for all your equipment and some training. I took a number of courses on hydraulics when I studied engineering that looked at the different components of the systems, tear-down and repair/ rebuild of the components, the electrical system and the components that were associated with the hydraulics system. From there given the basic knowledge, I now know what to look for when a problem occurs and will go straight to the service manual for options. I can, on occasion, bypass the manual in some cases if I have been working with one particular piece of equipment for a long time. But without having the basics, to include lists of pressures and temp and volts and clearances, etc, I frequently would not be very effective. And not knowing enough about hydraulics and trying to work on them, is dangerous. Not knowing to depressurize a specific line before dis-assembly could get you burnt severely or have a couple of tons of hydraulically supported equipment suddenly drop on me when I crack a line open. Hook up a sensor wrong and the equipment can be damaged from having an in-op sensor and someone always gets hurt, it's all very unforgiving.
1) Get all the manuals
2) Be safe, and never expose yourself to being in the "load zone" were a load can move and hurt you.
3) If you have to work alone make sure someone knows where you are and what you are doing, you would hate to be trapped and injured on a Saturday morning knowing that the crew won't be in till Monday morning.
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