液压挖掘机一般采用单排4点接触球式内齿回转支承。挖掘机工作中,回转支承承受轴向力、径向力、倾翻力矩等复杂载荷,其合理的维护保养显得十分重要。回转支承维护保养主要包括滚道及内齿圈润滑与清理,内、外油封的维护,紧固螺栓维护等。现从7个方面进行具体阐述。1.滚道的润滑回转支承滚动体和滚道容易损坏和失效,其故障率较高。在挖掘机使用过程中,向滚道内加注润滑脂能够减少滚动体、滚道、隔离块3者之间的摩擦和磨损。滚道腔空间狭小、加注 Hydraulic excavators generally use a single row of 4-point contact ball slewing bearing. Excavator work, slewing bearings to withstand axial force, radial force, tilting torque and other complex loads, and its reasonable maintenance is very important. Slewing bearing maintenance mainly includes lubrication and cleaning of raceway and ring gear, maintenance of inner and outer oil seals and maintenance of fastening bolts. Now from seven aspects to elaborate. 1 raceway lubrication Slewing bearing and raceway is easy to damage and failure, its failure rate is higher. In the excavator use process, to the raceway filling grease can reduce the rolling body, raceway, the friction between the block 3 and wear. Raceway cavity space is small, raise