Check if the swivel joint spring is deformed. Generally, springs are used for 3-5 years. The service life varies according to the working conditions. After a long period of use, the spring force of the rotary joint will weaken. If the deformation is severe or the replacement is new, replace the spring. It can be used; if it is used for a long time or there are impurities in the rotary joint, it will cause rapid wear or damage of the cylindrical ring. Inspect the cylindrical ring for damage or visible signs of deep groove-like wear.