precision spur gear slew drive is used in the field of automation. The product is installed vertically and has a large tilting moment. The spur gear slewing drive is used to drive the workpiece to rotate at different angles. The angular error requirements are very small and need to be guaranteed within 0.01°. According to the customer’s use requirements, the code S-II-0841-MC spur gear slewing drive was recommended to the customer. The slewing bearing height of the II series slewing drive is higher, the load and tilting moment are relatively large, vertical installation is more stable. What’s more the gears are designed with a small modulus, which can better reduce the angle error and increase the gear ratio, customers can choose to use reducer with small gear ratio to cooperate with their machine. The overall cost is lower and the total transmission error is smaller. In the design process, the factors that affect the transmission accuracy are minimized, continue to optimize the design, reduce the difficulty of production and improve the reliability of the spur gear slewing drive.