Which slewing bearing 130.40.1800.002 is the best in Zhangqiu City?

Zhangqiu City Slewing Bearing 3...Which one is better/' (3,3,3) - When using the tower crane, attention should be paid to changes in noise and rotational resistance torque. If there are any abnormalities, they should be dismantled and inspected.
The installation support of the slewing bearing (the seat supporting the lower bottom surface of the ring gear and the seat placed on the upper surface of the inner race) must have sufficient rigidity, and the installation surface must be flat. Before assembling the slewing bearing, the bearing should be stress-relieved to reduce the deformation of the slewing bearing bearing. The contact surface between the support and the slewing bearing must be cleaned during assembly.
When tightening the nut, lubricating oil should be applied to the thread of the bolt and the end surface of the nut, and a torque wrench should be used to tighten the nut symmetrically and evenly multiple times in the circumferential direction. During the final tightening, the pretightening torque should be roughly even on each bolt.
/ ' (3,3,3) - The tooth surface should be cleaned of debris once every shift and re-lubricated.
The slewing bearing must be lifted or stored horizontally, and must not be lifted or stored vertically to avoid deformation.
In order to ensure the reliability of bolt work and avoid insufficient bolt pre-tightening force, the pre-tightening torque of the bolts should be checked respectively during the first hour and after the slewing bearing is working. The preload torque should be checked every working hour thereafter.
/ ' (3,3,3) - Before the bolts are completely tightened, the gear meshing should be checked. The meshing condition should meet the requirements of gear accuracy: that is, the gear pair operates under slight braking. The contact spots distributed on the surface are not less than 3 in the height direction of the gear teeth and not less than 3 in the length direction of the gear teeth.
The bolts and nuts connecting the slewing bearing are all made of high-strength bolts and nuts, and double nuts are used to tighten and prevent loosening.