It is common for noise of tower crane slewing bearing during processing, while this situation happened, you should cut off the electricity, to find a solution to solve it. We will analysis some phenomenon causes noises,

The rolling ring blank is caused by the material & product quality control during the rolling or forging process, so that the raceway is crushed, and the crushing place will expand continuously in the next stages. When the rolling element passes, there will be “cracking”. Eventually the slewing bearing fails.

The rolling element is faulty, that is, there are pits or ulcers on the surface, which makes the slewing bearing of the tower crane inflexible and produces abnormal noise, and finally the slewing bearing is completely stuck.

The difference of material, quality and heat treatment process of the selected spacer block causes the slewing bearing spacer to deform, crush and assemble without adjusting the gap which will make the spacer block turn over, causing the rolling element to be normally blocked in the raceway. The broken spacer block produces an abnormal sound when the slewing ring is in operation.

The problem of slewing bearing plug and plug edge are not well smoothly machining during processing, and the taper pin is not fastened. When the steel ball passes through here, it will emit a continuous & regular noise. .

Because the surface of the equipment is not flat when the slewing ring is installed, the slewing bearing raceway will be deformed during work. Therefore, a large driving force is needed to overcome these points, so that the main structural components are twisted and the joints are misaligned. The big noise “cracking” will eventually happened..