Vertical mounted slew drives are specifically designed for solar tracking systems that require horizontal axis tracking. The precise rotation of the vertical slew drive allows the mechanism to track perfectly. This kind of vertical slewing ring drive is manufactured using the latest technology which incorporates hourglass mechanism. Also, therefore, the form of tooth contact has a greater torque holding capacity than normal drive. This allows larger panels to be installed, thereby reducing installation costs. During the installation of vertical slewing drive, it needs to consider the required torque for rotation and load conditions and ensure the installation of coaxiality or other accuracy.