It is forbidden to directly use a hammer to install the universal joint bearing

When installing the universal joint bearing, it is forbidden to hit it directly with a hammer. In daily use, add an appropriate amount of grease to the gimbal and to each needle. After installation, use the gun to re-inject 1/3 of the space of the universal joint oil hole. In addition, new lubricating grease should be added regularly to ensure the normal service life of the universal joint.