This is a top - notch Bafang M400 reduction gear for replacement. It comes with a Bafang max drive steel cover. The package includes a motor gasket, reduction gear, and gear cover/motor casing, just as shown in the picture. For guidance on replacing the reduction gear cover, refer to the following video.

Using this Bafang M400 reduction gear is easy. First, make sure you turn off the power to avoid any electrical issues. Then, follow the steps in the provided video to remove the old reduction gear and install this new one. When installing, ensure all parts fit snugly. As for maintenance, keep the gear clean and check for any signs of wear regularly. If you notice any strange noises or reduced performance, it might be time to give it a closer look. Also, always store it in a dry place to prevent rusting.