TGO series is an open housing slew drive. It is designed with an hourglass worm shaft with 5 teeth in contact between the slew ring and the worm shaft. This design offers a very solid back holding torque capacity for the heavy loads, very commonly used on man lift equipment and hydro excavator. Heat treated teeth and hard-as-a-rock worm make it the top of its class. Light weight is also an advantage of this drive.