A slewing bearing is a large, specialized bearing structure capable of simultaneously withstanding substantial axial loads, radial loads, and overturning moments. It integrates multiple functions such as support, rotation, transmission, and fixation. Due to its complexity and critical role in equipment, it is essential to conduct thorough inspections during installation and follow strict maintenance and storage guidelines to prevent damage and ensure proper operation.
Before installation, inspect the mounting surface of the host machine. The supporting structure must possess sufficient strength, and the connection surface should be machined flat, free of debris and burrs. If machining cannot achieve the required flatness, high-strength structural plastic fillers can be used to correct the surface and provide vibration damping.
Each raceway ring of the slewing bearing has a quenched soft zone, indicated by an "S" mark on the end face. During installation, this soft zone should be positioned in a non-load or infrequently loaded area (the plug hole is always located in the soft zone).
The bearing should be radially positioned first, and installation bolts should be tightened in a crisscross pattern. Check the bearing's rotational condition during this process. Bolts must be tightened with sufficient preload, typically 70% of the bolt material's yield strength. Quenched and tempered flat washers should be used with the bolts, and spring washers are strictly prohibited.
After installation and 100 hours of continuous operation, all mounting bolts should be checked to ensure the preload torque meets specification. Repeat this inspection every 500 hours of operation.
Upon installation, the bearing must be filled with an appropriate amount of grease. Rotate the bearing while applying grease to ensure even distribution. Over time, some grease will inevitably dissipate, so it is recommended to replenish the grease every 50–100 hours during normal operation.
During transportation, the bearing should be placed horizontally on the vehicle with measures in place to prevent sliding and vibration. Auxiliary supports should be added if necessary.