Slewing Bearings Installation Instructions

1. Transportation and Storage of Slewing Bearings

Slewing bearing should be placed horizontally on the vehicle during transportation. Measures should be taken to prevent sliding and vibration. Auxiliary support should be added when necessary. Bearings shall be placed horizontally on dry, ventilated and flat sites, and shall be stored in isolation from chemicals and other corrosive items. If multiple sets of bearings are overlapped, more than three wooden pads of equal height should be evenly placed between each set along the circumferential direction, and the position of upper and lower pads should be the same. Bearings that still need to be stored beyond the anti-rust period should be cleaned and treated again.

2. Installation of Slewing Bearing

Before the installation of slewing bearing, the installation surface of the main engine should be inspected, and the supporting parts should have enough strength, the connection surface should be machined, and the surface should be smooth and free of debris and burrs. In order to ensure the accuracy of the installation plane and to reduce the vibration, the method of filling resin should be adopted for the planarity that can not be machined to meet the requirements. The ring of slewing bearing has quenched soft belt area, which is marked with “S” on the face of the ring. The position of the soft belt should be placed in the non-load area or the non-constant load area (the plug hole is always located in the soft belt area). When installing the slewing bearing, the radial positioning should be carried out first, the installation bolts should be tightened cross-wise, and the rotation of the bearing should be checked. When tightening the bolt, there should be sufficient preload, which should be 70% of the yield limit of the bolt material. Installation bolts should be equipped with conditioned flat washers and spring washers are strictly prohibited.

3. Maintenance of Slewing bearing

After 100 hours of continuous operation, the pre-tightening moment of the bolt should be checked thoroughly, and the above checks should be repeated every 500 hours of continuous operation. When the slewing bearing is installed, proper amount of grease should be filled, Fill the lubricating grease of slewing bearing evenly and rotate at the same time. The slewing bearing will inevitably lose part of the grease after working for a period of time. Therefore, the grease should be added once every 50-100 hours after the normal operation of the slewing bearing.