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Maintained Parts >> Judged Problem with slewing bearing

 The slewing bearing of the excavator has an abnormal sound. How can it be judged that it is not normal?
 
The excavator can rotate left and right during work, and it is inseparable from the slewing device, and the back support is an important part of the slewing mechanism. The excavator slewing bearing is mainly used to support the upper body mass and bear the working load, and this component is also the place where the excavator is prone to failure.
 
Since the slewing bearing of the excavator generally works under heavy load conditions, and the working environment of the excavator is relatively bad, the slewing bearing is prone to failure, and the most common is the occurrence of various abnormal noises. What is the cause of the abnormal noise? What should I do to troubleshoot?
 
First of all, it is necessary to be clear that when the slewing bearing is idling just after leaving the factory, the uniform sound of the rolling of the steel ball will be emitted, which is a normal sound; if it is installed soon, it does not matter if a slight abnormal sound occurs, and it will generally disappear after a certain period of rotation. . What we are talking about today is a louder and more special sound. You need to pay attention when you hear special noise.
 
First, the mounting surface is not flat and the mounting bolts are loose.
In the case of abnormal noise, it is necessary because of the installation operation problem, when the unevenness of the mounting surface does not meet the requirements, the raceway will form a negative gap, resulting in abnormal noise; in addition, when the pinion gear is poorly engaged, There is also the possibility of abnormal noise, which may cause malfunction of the broken teeth; in addition, when the mounting bolt is loose, the slewing bearing is elastically deformed, and the deformation position generates a negative gap, and it is necessary to immediately perform the inspection to tighten the bolt as required.
 
Second, the slewing bearing has foreign matter
When the inside of the slewing bearing has foreign matter such as sand or iron filings, non-periodic vibration occurs, and at the same time, there is a problem that the rotation is inflexible. When encountering such a situation, it is necessary to strictly clean the bearings, shafts, seat holes and matching parts before installation, and remove the foreign matter in the lubricant in time; remember to avoid the use of plastic cages with impure materials or embedded foreign objects. This will remove the corresponding abnormal noise.
 
Third, the abnormal noise caused by the grease problem
The slewing ring of the excavator is lubricated with grease, and the abnormal noise is most likely caused by lubrication problems. Common causes are the lack of grease in the raceway, uneven grease filling, poor grease quality aging, and incorrect lubricant selection. To solve this problem, you only need to use the right lubricant, timely filling, and timely replacement.
 
Fourth, the abnormal noise caused by the broken seal
Check the seal for wear, because the structure of the slewing bearing seal plays a key role in the sealing. When the seal and the slewing ring do not fit completely, it is easy to cause grease leakage. In addition, the weathering resistance and the butter resistance of the sealing strip material are also issues to be considered.
 
Fifth, abnormal noise caused by cracks, indentations or rust
When the rolling surface of the slewing bearing is cracked, indented or rusted, it also hears periodic vibration like a rivet rivet, and the flaw will continuously occur on the channel, and the flaw will appear on the steel ball, and this kind of time The noise varies with installation and lubrication conditions. The liberation method is to not knock the bearing or use a high viscosity grease during installation.
 
Sixth, the raceway and rolling elements are seriously worn
The excavator has abnormal noise during the turning process, which is most likely caused by severe wear of the slewing bearing raceway and the rolling element. At this time, the slewing bearing needs to be repaired.