The reasons for the oil leakage of the door closer may be: 1, the oil seal screw is not tightened or the seal is not good; 2. Casting defects; 3. External force destroyed the cylinder block. The key quality problem of the door closer is whether it leaks oil, because the door closer controls the closing process by throttling the fluid in its internal hydraulic system, and oil leakage means the failure of the hydraulic system, so the hydraulic system is the only criterion to determine the service life of the door closer. The main reasons for oil leakage are that the gap increases due to the wear of pinion support guide, the sealing effect decreases due to the wear of sealing ring, or the throttle core rotates counterclockwise away from the valve body when adjusting the buffering effect. The reduction of the buffering effect of the door closer is caused by the oil leakage into the air or the increase of the fit (throttle) gap between the rack plunger guide cylinder and the valve body. Therefore, the quality and accuracy of materials, heat treatment and machining of pinion and supporting guide rail are very important. For the door closer with poor buffering effect, it is impossible to solve the problem simply by adjusting the throttle core to throttle. It must be repaired. If the support guide leaks oil, remove the support guide and check the condition of the sealing ring. If worn or aged, replace the sealing ring. If the gap between the support rail and the pinion shaft is too large, replace the support rail. If the guide cylinder of the rack plunger is worn, the fit clearance between the rack plunger and the valve body increases, which leads to the decrease of throttling effect. The rack plunger can be removed and the surface can be repaired by chrome plating. In addition, under the condition of ensuring the buffering effect of the door closer, it is also a way to reduce the impact of the back door on the door frame because of the poor buffering effect.
You can't. Oil leakage means that the oil seal is broken. It is necessary to replace the new oil seal. In addition, special tools are needed to remove the door closer. The oil used is also a special oil. After adding oil, change the oil seal, and finally debug its drawing speed ... it is best to ask professionals to repair it, and it won't cost much. Knowledge expansion: The door closer is a spring-like hydraulic device on the door head. When the door is opened, it can be released after compression, and it will automatically close the door. It has the function of spring door, which can ensure the door to close to the initial position accurately and timely after opening. Modern hydraulic door closers (door closers for short) began with a patent registered by Americans in the early 20th century. Different from the traditional door closer, it achieves the buffering effect by throttling the liquid in the door closer. The core of the design idea of hydraulic door closer is to control the door closing process, so that the functional indexes of the door closing process can be adjusted according to people's needs.