Several common noise fault excavator hydraulic parts

by:HMB     2021-01-26
Several common noise fault (excavator hydraulic parts 1) 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 are: (1) the hydraulic pump oil filter, oil inlet blocked or 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 is damaged, or into the tubing seal bad, cause air to enter. (3) the 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. ( 2) 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 servo valve, control valve core flow piston may also be due to the partial abrasion, strain, the piston pulsation in the process of moving, hydraulic pump output flow and pressure fluctuations, thus have great vibration and noise in the pump outlet. At this time to wear, severe injury of components for brush plating bedding-in or replacement processing. ( 3) 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. 2, the noise of the overflow valve, relief valve is easy produce high-frequency noise, mainly caused by pilot valve performance is not stable, namely as the guide valve cavity pressure high-frequency oscillation caused by air before the vibration and noise. The main reason is: ( 1) The oil mixed with air, in front of the pilot valve cavity formation of cavitation caused the high frequency noise. At this point, should be timely to do back into the air and prevent the outside air. ( 2) Needle valve open in use process because of the frequent and excessive wear, make needle valve cone and the seat cannot be closed, the guide flow instability, produce pressure fluctuation caused by noise, should be timely repair or replacement at this time. ( 3) Pilot valve caused by deformation of spring fatigue its regulating function is unstable, makes the pressure fluctuations caused big noise, spring should be changed at this time. 3, the noise of the hydraulic cylinder ( 1) The oil mixed with air or air line do not completely in the hydraulic cylinder, under the effect of high pressure to produce cavitation caused larger noise. At this point, must be timely exhaust air. ( 2) Cylinder head oil seal too tight or piston rod bend, in the process of movement will be don't strength and noise generation. At this point, must be timely replace oil seal or alignment of the piston rod. 4, line pipe die bending too much noise or fixed clamp loose can also produce vibration and noise. , therefore, should try to avoid dead turn on piping layout, to loosen the clamp must be tight.
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