First of all, we must do a good job in the inspection and maintenance of the slewing bearing. First use the slewing bearing for 100 working hours to check the bolt moment moment. Assuming that about 10% of the bolts are loose, check again after the 200th working hour. After that, check every 500 working hours; reduce the check distance for extreme loads. After a total of 2000 hours of operation of the machine and equipment, if a bolt is found to be loose to below 80% of the required torque, the bolt and the two nearby bolts should be replaced. Assuming that 20% of the bolts are found to be loose to below 80% of the required torque, all bolts should be replaced. After a total of 14,000 hours of operation of the machinery and equipment, all bolts must be replaced.