The most obvious phenomenon of the failure caused by the air entering the hydraulic system is power drop, abnormal noise and high temperature. How does the air enter the hydraulic system? In our usual maintenance process, some air, dust and other impurities will enter the hydraulic system. Once in the air, the lighter ones will reduce the work efficiency and seriously damage the hydraulic components. How to deal with it? The following editor will tell you one by one that after air enters the hydraulic system, it will affect the working efficiency of the hydraulic system, the response speed will be slow, the pressure will be unstable, and the actual work will be powerful and sometimes weak, and the actions are relatively uncoordinated.
The working parts of the hydraulic system, hydraulic pumps, motors, control valves (distributors) and oil pipes, will have noise, abnormal noise and vibration. ; In the high-pressure working area of the hydraulic system, such as the plunger and cylinder of the hydraulic pump, and the suction port of the pump, parts are prone to damage, and small air bubbles mixed in the hydraulic oil will be compressed and burst. The surface of the part, resulting in insufficient pressure, power drop, etc. ; Air will also degrade the hydraulic oil and cause abnormally high temperature in the hydraulic system. Countermeasures: Ensure that the hydraulic oil level in the hydraulic oil tank is higher than the return oil level. If the return oil level is higher than the hydraulic oil level in the oil tank, a lot of air will be mixed in. Therefore, the hydraulic oil in the oil tank cannot be lower than the lower score line, and it should be in the middle position. ; After replacing the hydraulic components, open the exhaust port of the component, such as the hydraulic main pump. You can select an oil port to open at the highest point and add hydraulic oil to exhaust.
The breathing valve installed on the hydraulic oil tank cover should be checked and cleaned regularly. Prevent the breathing valve from blocking the oil passage due to dust and affecting the air discharge of the hydraulic oil tank. The key point is to summarize the failures caused by the hydraulic system entering the air. Through the above introduction, I believe that everyone has a basic understanding of the common failures of the air entering the hydraulic system! Therefore, the maintenance and maintenance of the hydraulic system must be meticulous and comprehensive. In particular, the hydraulic system is easy to enter the air when replacing the accessory device or disassembling the hydraulic device. Therefore, the exhaust must be done well to avoid failure.