Excavator - hydraulic pump noise analysis and maintenance

After the excavator has been in use for a long time, some excavators may have excessive noise from the hydraulic pump. This phenomenon is caused by many reasons. It is necessary to conduct detailed investigations to determine the real cause.

First, the suction pipe is blocked, the possibility is 70%, and the damage is extremely great. It is very easy to appear after the excavator has been used for a long time. The reason is that the oil suction filter has not been cleaned and replaced for a long time, or it may be because the dirt has entered the fuel tank and the oil filter is clogged. Harmful consequences, once the oil absorption is not smooth, will cause a local vacuum phenomenon, so that the air originally dissolved in the oil is separated, this air causes a great vibration of the equipment work, causing premature damage to the components of the excavator.

The solution is to replace the filter element in accordance with the requirements of the technical manual. The hydraulic oil tank should not allow dirt to enter. Check the suction pipe regularly and solve the problem promptly.

Second, there is air in the hydraulic pump, the possibility is 60%, the damage is great. Once the air is mixed into the oil, cavitation and holes will occur, which will cause the noise of the Komatsu spare parts hydraulic pump to be too large, and the equipment will be over Early damage.

The solution is to check for possible air ingress and to exclude air from the oil and air from the pipes.

Third, the viscosity of the oil is too large, the possibility is 50%, the damage is extremely great, the viscosity of the oil is too large, mainly caused by excessive use, and once it appears, it will make oil absorption difficult, which will cause local vacuum phenomenon. The air originally dissolved in the oil is separated, and the air causes a great vibration of the equipment to work, causing premature damage to the components of the excavator. If the viscosity of the oil is too large, the filter element will fail early and the oil pump of the excavator will be damaged.

The solution is to inspect and replace the hydraulic fluid as required.

4. The oil level in the hydraulic tank is too low, the oil quantity is insufficient, the possibility is 40%, and the damage is extremely great. If the oil level is too low, the hydraulic spare parts pump will not absorb enough oil, and some air will be sucked in. The work of the equipment caused a lot of vibration, causing premature damage to the components of the excavator. If the viscosity of the oil is too large, the filter element will fail early and the oil pump of the excavator will be damaged.

The solution is to always check if the oil level in the hydraulic tank is within the normal range.

5. The bearing wear of the oil pump is too large, so there is a lot of noise. The possibility is 30%, the hazard is general, bearing wear mainly occurs in excavators that have been working for a long time. Not only is the noise very high, but the components of the excavator are also weak. The solution is to overhaul the oil pump.

Sixth, the speed of the hydraulic pump is too high, so the noise appears. The possibility is 20%, the hazard is general, the high speed is not only the noise is too large, but also the premature damage of the excavator spare parts hydraulic pump. At this time, the various working devices of the excavator have normal performance. The solution is to adjust the pump speed.

7. The structural design of the pump is unreasonable. The probability is five percent, which is a congenital shortcoming. No way.

8. The coaxiality between the pump and the engine is poor, and there will be a lot of noise on different axes. The possibility is 20%, and the harm is average. If it does not occur after the overhaul, the normal excavator will only have this situation after working for a long time, and the different shafts will accelerate the wear and tear as soon as possible. Coping solution, more coaxial with the pump.

Nine, the hydraulic pipeline has vibration, so noise is generated. Five percent of the possibility is harmful. If the pipe corner is too large, it will be affected by the oil and will also generate a large noise. Coping with the program, changing the design of the pipeline. https://jnjmzm.wixsite.com/sdjygcjx