Hydraulic pressure is the most critical parameter which determines the efficiency of hydraulic machinery. The MRV -- main relief valve controllers the hydraulic pressure. The main relief valve is set to protect the hydraulic pump from back pressure. It is set at a particular pressure which the hydraulic pump can hold. If more back pressure comes in, it opens up to release it.Engineering tutorials
So it very critical to set the MRV pressure at the exact recommended level.
If it set above the recommended level. The back pressure will hit the hydraulic pump, resulting in its failure.
If it is set below the recommended level MRV opens up and releases the pressure, resulting in less efficiency of hydraulic machinery (the load bearing capacity reduces).
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Process of checking Hydraulic pressure:
In most of the construction equipments. The pressure check point is located at the loader valve block near the main relief valve. We remove the adapter from the pressure check point and connect the pressure gauge hose to this point. Now we start the machine and load it to the maximum extend. This will show the pressure set at the MRV because when we load the machine to the maximum limit the MRV opens. This will provide us the MRV opening pressure at the pressure gauge as shown in the video.
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