In practice, most slewing bearings receive very little radial force (HP), which is usually less than 0.1Gp and can be ignored. To simplify the calculation, when selecting a standard size slewing bearing, the loading capacity charts are widely used to indicate the loading capacity of the slewing bearings in many national or manufacturers’ standard. There are many shapes of the loading capacity charts. Figure 1 is the straight line capacity chart. This chart has axial force Gp as its abscissa and the tilting moment M as the ordinate. Every slewing bearing with a specific dimension has its loading capacity indicated by a diagonal line. If the The intersection of the external load (Gp, M) sits below the diagonal line, it indicates that it can work safely. If the  intersection of the external load (Gp, M) sits above the diagonal line, the slewing bearing is overloaded.

  • Continuous loads : single bucket excavators, tunnel boring machines, conveyors, cantilever stackers, bucket wheel excavators, timber harvesting cranes, tower cranes, grabs and electromagnetic chuck cranes;
  • Intermittent loads : mobile cranes and truck cranes, hydraulic platforms, railway cranes and deck cranes operating under safe working loads;
  • Short-duration load: equivalents to the load that the slewing bearing is subjected to when the machine is subjected to an overload test. It is equal to 1.25 times the safe working load of the crane or the load when the crane is subjected to a hurricane.

Loading Graph:

To obtain more loading charts of slewing bearings, please contact engineers from Fenghe.