A real case describes the maintenance method of abnormal noise of excavator turntable
According to the sharing of real cases, when a Komatsu excavator was working on the construction site, when the excavator slewing platform stopped rotating to the right, the excavator slewing platform automatically slid, could not be positioned, and there was an abnormal sound of "creak, creak". In addition, other actions of the excavator were normal
Share common reasons for abnormal noise of excavator turntable:
1. The hydraulic circuit is faulty
2. The slewing mechanism is faulty
Analysis on abnormal noise of Komatsu excavator turntable:
First of all, it seems that the noise is caused by the mechanical parts. For example, the steel ball of the bearing in the slewing support is broken or the gear in the slewing reducer is damaged, and the abnormal sound may be generated during its rotation. However, in fact, the abnormal sound only occurs when the slewing platform rotates to the right and stops rotating
Therefore, it can be concluded that the abnormal sound of "creak" and "creak" is not caused by the damage of one part of the slewing mechanism, that is, all parts of the slewing mechanism are not damaged. The fault of the abnormal sound of the excavator slewing platform is caused by the blockage of the oil replenishing valve
Share common treatment methods for abnormal noise of excavator slewing table:
Unscrew the oil makeup valve from the excavator motor control valve. It was found that the valve core was pressed against the valve seat and could not move. The valve core was knocked out after several times It is found that the valve seat and the valve core are rusted and the inner wall of the valve hole is scratched. It is obvious that the reason why the valve core cannot move is that the valve core is stuck in the valve hole by impurities and the valve core and the valve seat are rusted. After careful observation, it is mainly stuck by sundries
It is found that there are many small particles in the hydraulic oil flowing out from the oil makeup valve. Loosen the oil drain plug on the bottom of the oil tank, and the oil flowing out obviously contains water bubbles. Therefore, the final cause of the fault is the serious pollution of the hydraulic oil in the hydraulic system
After replacing the hydraulic oil and oil replenishing valve, the excavator works normally and the fault is removed. According to relevant information, 75% of the faults in the hydraulic system are caused by the pollution of hydraulic oil According to practical experience, at least 85% of hydraulic system failures are caused by hydraulic oil pollution, and the loss caused by pollution is several times or even more than the normal loss From the aspects of design, manufacture, maintenance, repair and use, the pollution source mainly comes from improper maintenance, repair and use. Therefore, it is necessary to strengthen the pollution control of hydraulic oil in the use and maintenance of hydraulic system
