Instructions for use: (1) Do not install the wrong direction and destroy the lip. If there are more than 50 μ m scars on the lip, it may lead to obvious functional loss. (2) Prevent forced installation. Do not knock in with a hammer, but use a special tool to press the sealing ring into the seat hole, and then use a simple cylinder to protect the lip through the splines. Before installation, apply some lubricating oil to the lips in order to install and prevent burns during initial operation, and pay attention to cleaning. (3) To prevent excessive use. Rubber seals generally have a service life of 3000 000 hours, and new products should be replaced in time. (4) the size of the replacement should be the same. Strictly in accordance with the requirements of the instructions, choose the same size of products, otherwise can not guarantee the compactness and other requirements. (5) Avoid the use of old parts. When using the new part, also carefully check its surface quality,…