... , easy maintenance and overhaul. BW66420004 Worm Gear is crossed in the large gear, meshing with the worm gear pair. It is compact body, ... ratio, load capacity, smooth rotation, and smaller noise. Worm gear have self-locking nature of its institutions, can play the ... friction. It can be used in the intermittent work.BW66420004 Worm Gear : Easy to install, flexible and nimble,superior performance, ...