three series heavy load crossed roller external gear full protection spur gear slewing drive, customer used it in industrial rotary table, which required to carry load 20T, flexible rotation and durability. Unique Transmission has designed this S-III-O-1120 spur gear slewing drive to customer. The slewing bearing adopts crossed roller structure, which is more stable and bears larger load. The other parts adopt three series heavy load design to ensure that there is no short board in design and to ensure overall high performance of the spur gear slewing drive assembly.