Before installing the turntable bearing, the installation surface of the main engine should be checked first. The support should have sufficient strength, the connection surface should be machined, and the surface should be flat and free of debris and burrs. For those that cannot be machined to achieve the required flatness, special plastics with high injection strength can be used as fillers to ensure the accuracy of the installation plane and to reduce vibration. The ring of the turntable bearing has a quenched soft belt area, which is marked "S" on the end face of the ring. When installing, the soft belt should be placed in the non-load area or non-frequent load area (the plug hole is always located at the soft belt). When installing the turntable bearing, radial positioning should be performed first, the mounting bolts should be tightened crosswise, and the rotation of the bearing should be checked. There should be sufficient preload when tightening the bolts, and the preload should be 70% of the yield limit of the bolt material. The mounting bolts should be equipped with quenched and tempered flat washers and spring washers are strictly prohibited.