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Excavator maintenance of several hydraulic parts common noise and failure

Author:Lanye Wang Date:2021-2-24

Excavator maintenance of several hydraulic parts common noise and failure


The overflow valve is easy to produce a high frequency noise, mainly caused by the performance of the pilot valve and unstable factors. The excavator maintenance technology is the noise generated by the high frequency oscillation of the pressure in the front chamber of the pilot valve, which can cause the vibration of the ambient air system.


Maintenance excavator The first hydraulic excavator was invented successfully by the French Poclane factory.

Because of the application of hydraulic technology, in the 1940s there was a hydraulic backhoe mounted on the tractor suspension type excavator.

Repair excavator common excavator structure includes, power device, working device, rotary mechanism, operating mechanism, transmission mechanism, walking mechanism and auxiliary facilities.


Excavator repair excavator is manual at first, from the invention to now has more than one hundred and thirty years, during which experienced the gradual development process of steam driven bucket rotary excavator to electric drive and internal combustion engine driven rotary excavator, the application of mechanical, electrical and hydraulic integration technology of automatic hydraulic excavator.


The main reasons for the problem are: the oil mixed with air, the formation of cavitation phenomenon in the pilot valve in the front cavity and caused high frequency noise students.

At this time, the air should be discharged in time and prevent the external influence of the enterprise air needs to start entering again.

Needle valve in the process of use and management due to frequent opening and excessive wear, so that the needle valve cone and valve seat can not close, resulting in economic pilot flow structure instability, large fluctuations in learning pressure and social noise, should be repaired or replaced in time.

The pilot valve's pressure regulating function demand is unstable because of the fatigue deformation ability of the spring. The excavator's repair makes the life pressure fluctuate greatly and causes noise. At this time, the spring should be replaced.


The noise of the hydraulic cylinder is mixed with an air in the oil or the air in the hydraulic cylinder is not completely exhausted. Under the influence of high pressure, the phenomenon of reducing cavitation distribution is produced, which leads to larger students and noise.

At this point, the air must be drained in time.

Whether the cylinder head oil seal is too tight or the piston rod is bent will also produce different noises due to different strength in the process of movement.

At this time, the corresponding oil seal or straightening piston rod must be replaced in time.

Piping system noise control Too many dead bends or loose fixed clips can also produce a vibration and noise.

Therefore, in the pipeline design and layout should be as far as possible to avoid dead bending, the loose clips must not be tightened in time.


The noise inhalation phenomenon of hydraulic piston pump or motor is one of the main reasons for the high noise of hydraulic pump.

When oil is mixed with air, it is easy to form cavitation phenomenon in its high pressure region, and it propagates in the form of pressure wave, which leads to oil oscillation and cavitation noise.


Main reasons:


The oil filter of the hydraulic pump, the oil inlet pipe is blocked or the oil viscosity is too large, which will cause the vacuum of the pump inlet to be too high and make the air penetrate.

The hydraulic pump and pilot pump shaft end oil seal is damaged, or the inlet pipe is poorly sealed, resulting in the air oil level into the tank is too low, so that the inlet pipe of the hydraulic pump is directly emptied.


When the hydraulic pump work continues to appear a high and noise, should be the first part of the above can be analyzed and checked, found that these problems need to be dealt with in a timely and effective manner.

Hydraulic pump internal structural elements excessive use of wear, such as piston pump cylinder and valve plate, plunger and plunger hole and other matching parts of wear, strain, so that the hydraulic pump leakage phenomenon is serious, when the hydraulic pump output high pressure, small flow of oil will produce cash flow pulsation, cause students high noise.

At this time, the teacher can appropriately increase the deviation Angle of the relevant mechanism of the research variable of the pilot technology system to improve the influence of internal leakage on the output data flow of the pump.

The servo valve core of the hydraulic pump and the piston controlling the network flow rate will also pulsate the piston in the process of mobile learning due to local wear and strain, resulting in the fluctuation of the output information flow rate and pressure of the hydraulic pump, thus producing a large vibration and noise at the pump outlet.

At this time the enterprise can be worn, serious strain of components between the brush plating grinding or replacement of their own processing.


The valve plate of hydraulic pump is also one of the important components which is easy to produce noise.

During the use of the distributor, due to the surface wear or silt deposition at the opening of the unloading tank, the unloading tank is shortened and the unloading position is changed, resulting in the increase of oil capture and noise.


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