In the maintenance of slewing bearings, lubrication is especially important. Appropriate lubrication methods and regular grease injection maintenance have a decisive influence on the bearing raceway and tooth life. A small amount of No. 2 extreme pressure lithium-based grease is generally added to the raceway of the slewing bearing when it leaves the factory. The user should refill with new grease according to different working conditions when it is activated.
The slewing bearing raceway should be filled with grease regularly. Generally, ball slewing bearings are filled every 100 hours of operation, and roller slewing bearings are filled every 50 hours of operation. In the case of the special working environment, such as high temperature, high humidity, a lot of dust, large temperature changes, and continuous work, the lubrication cycle should be shortened. New grease must be added before and after the machine stops running for a long time. Each lubrication must be filled with grease in the raceway until it leaks from the seal. When injecting grease, rotate the slewing ring slowly to make the grease-filled evenly.
For the toothed slewing ring, the sundries on the tooth surface should be removed frequently and corresponding grease should be applied in time. According to different working conditions, users can also choose the best grease by themselves. After the slewing ring is operated for 100 hours for the first time, the bolt pre-tightening force must be checked. After 500 hours of operation, sufficient bolt pre-tightening force must be maintained.
Pay attention to the operation of the slewing bearing during use. If abnormal noise, impact, or a sudden increase in power is found, stop the machine for inspection immediately, eliminate the fault, and disassemble and inspect if necessary. It is best to take protective measures during use to avoid adverse effects caused by wind, dust, rain, water immersion and high temperature, and to prevent hard foreign objects from approaching or entering the tooth meshing area. Check the integrity of the seal frequently. If the seal band is found to be damaged, it should be replaced in time. If the seal band is found to fall off, it should be reset in time.
Methods and techniques of grease filling for slewing bearings:
When adding grease to the slewing ring, the raceway must be filled first. There are oil holes or grease nozzles on the outer wall or surface of the slewing ring. Use a grease gun to inject grease. When adding grease to the slewing ring in winter, add 2# lithium grease, and in summer, add 3# lithium grease. When adding grease, a small amount of lubricating oil is generally added during production, and it must be filled with lubricating oil during construction site operation.
At the same time, when the slewing bearing is filled with grease, the gear is filled with grease, and generally, the entire ring of teeth needs to be filled. The slewing bearing of the main engine needs to be filled with grease every 100 hours of operation, which can effectively reduce the wear between the slewing bearings and increase the service life of the slewing bearings.
Please check the Product Guide to select suitable bearings for your machinery.
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