The cause of the excavator hydraulic pump noise

by:HMB     2021-01-29
Empty absorption phenomenon is one of the main reason for the high noise of hydraulic pump. When mixed with air in the oil, easy to form in the high cavitation, and in the form of pressure wave propagation, causing oil oscillation, cause the system to produce cavitation noise. The main reasons. 1. Hydraulic oil filter, oil inlet blockage or the oil viscosity is too high, can cause high vacuum pump inlet place, make the air infiltration. 2. Hydraulic pump, the forerunner of pump shaft end seal damage, or into the tubing seal bad, cause air to enter. 3. Fuel tank oil level is too low, make the hydraulic pump suction air inlet pipe directly. When the hydraulic pump work in high noise, shall, first of all, the above parts for inspection, found that the problem handled in time. Hydraulic pump internal components excessive wear, such as plunger pump valve plate and cylinder, plunger and plunger hole mating parts wear, strain, causes the hydraulic pump leakage is serious, when the hydraulic pump output pressure, small flow oil will produce flow pulsation, high noise. At this point can be appropriately increase the Angle of pilot system variable mechanism, in order to improve the effect of leakage on the pump output flow within. Hydraulic pump valve disk is also easy to cause one of the important components of noise. Valve plate in use for surface wear or sludge sedimentation in unloading slot open place, will make the unloading groove short and change the position of unloading, the trapped oil phenomena, which in turn lead to higher noise. In normal and replacement process, the new structure of flat grinding tinkering will appear shorter unloading groove consequences, at this point, if not timely appropriate slender, it will also produce large noise. In the process of assembly, with big unloading chute flow plate must be installed in the pump high pressure cavity, and pointed the direction and the cylinder rotate to must be relative, otherwise will bring bigger noise system.
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