A Kobelco SK460-8 suddenly appeared abnormal noise when turning during work, and it was found to be more and more serious, and the noise was getting louder and louder.
The slewing bearings of excavators are generally prone to failures under heavy load conditions. The most common ones are various abnormal noises. According to the analysis, the main reasons for the abnormal noises of the excavator rotation are: 1) The slewing bearing has foreign matter. 2) Abnormal sound caused by grease problem, 3) abnormal sound caused by damaged sealing strip, 4) abnormal sound caused by cracks, indentations, or rust, 5) serious wear of raceways and rolling elements. So today we come to learn about the reasons for the abnormal noise in the rotation of the excavator.
1. There is a foreign body in the slewing bearing
When there are foreign objects such as sand particles and iron filings inside the slewing ring, periodic vibration will occur, and at the same time, there will be failures of inflexible rotation.
2. Abnormal noise caused by grease problem
The slewing bearing of the excavator is lubricated with grease, and the abnormal noise is likely to be caused by lubrication problems. Common reasons include lack of grease in the raceway, uneven grease filling, poor quality and aging of grease, and incorrect selection of lubricants.
3. Abnormal noise caused by damaged sealing strip
Check whether the sealing strip is worn or not, because the structure of the slewing bearing sealing strip plays a key role in the sealing performance. When the sealing strip and the slewing ring cannot be completely attached, it is easy to cause grease leakage. In addition, the aging resistance and butter resistance of the sealing strip material are also issues that need to be considered.
4. Abnormal noise caused by cracks, indentations, or rust
When the rolling surface of the slewing bearing is cracked, indented or corroded, periodic vibrations like riveting rivets can also be heard. The scars will continue to occur on the channel, and the scars will appear occasionally on the steel ball. The noise varies with installation and lubrication conditions.
5. Severe wear of raceway and rolling elements
The abnormal noise of the excavator during the slewing process is likely to be caused by the serious wear of the slewing ring raceway and rolling elements. At this time, the slewing ring needs to be repaired.
All of the above are the reasons that will affect the abnormal sound of the excavator's rotation. As long as the reason is checked, the failure can be solved.
