1. Installation of turntable bearing
Before installing the turntable bearing, check the mounting surface of the main engine. The support should have sufficient strength, the connection surface should be machined, and the surface should be smooth and free of debris and burrs. For those that can not 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 zone, which is marked with “S” on the end face of the ring. The position of the soft zone should be placed in the non-load area or the non-recurrent load zone (the plug hole is always in the soft Belt).
When installing the turntable bearing, perform radial positioning first, tighten the mounting bolts crosswise, and check the rotation of the bearing. There should be sufficient pre-tightening force when tightening the bolts, and the pre-tightening force should be 70% of the yield limit of the bolt material. Mounting bolts should be equipped with quenched and tempered flat washers and spring washers are strictly prohibited.

2. Maintenance of turntable bearings
After the turntable bearing is installed and put into operation, after 100 hours of continuous operation, check whether the pre-tightening torque of the mounting bolt meets the requirements, and repeat the above inspection every 500 hours of continuous operation.
After the turntable bearing is installed, the appropriate amount of grease should be filled, and the bearing should be slewed while filling to make the grease evenly distributed. The turntable bearing will inevitably lose part of the grease after working for a period of time. Therefore, the turntable bearing in normal operation should be replenished every 50-100 hours.

3. Transportation and storage of turntable bearings
During transportation, the bearing should be placed horizontally on the vehicle, and measures should be taken to prevent sliding and vibration, and auxiliary support should be added when necessary.
Bearings should be placed horizontally on a dry, ventilated and flat site, and should be kept away from chemicals and other corrosive items during storage. If multiple sets of bearings are stacked, three or more wooden blocks of equal height should be evenly placed along the circumference between each set, and the positions of the upper and lower blocks should be the same.
Bearings that need to be stored after the anti-rust period should be cleaned and anti-rust treated again.