Spherical roller bearings are often used in the main shaft of the turbine. It is also common to find a tapered roller bearings (TRB) used in combination with a cylindrical roller bearing (CRB) at this location. There are a number of different bearing designs that can be found in the gearbox of a wind turbine, but most often, various combinations of CRBs, TRBs and ball bearings are used. MAC offers bearings with new sealing solutions designed to improve retention of lubrication.
Slewing ring bearings are typically found in the pitch and yaw locations of a turbine and help ensure that the blades rotate smoothly. As long as proper maintenance procedures are observed, they do not usually experience many problems besides normal wear and tear over time.