Three-Row roller slewing ring has three seatrings, which separatying the upper, lower and radial raceways, via which the load of each row of the rollers may be specified. It may bear different loads simultaneously and its load the largest one among the four models.

     Owing to large size of its axle and radius, it is sturdy and especially suitable for hearvy-duty machines which require large working diametre, such as bucketwheel excavators, wheeled cranes, deck cranes, port steel transporters, heavy duty mobile cranes etc.