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How should the hydraulic system enter the air?

The failure caused by the air entering the hydraulic system, the obvious symptoms of the failure are 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 one will reduce the work efficiency, and the serious damage to the hydraulic components. How to deal with it? You will get the answer below.


Trouble phenomenon: Affect the working efficiency of the hydraulic system, the response speed becomes slow, the pressure is unstable, the actual work is sometimes strong and sometimes weak, and the action is 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. Small air bubbles mixed in the hydraulic oil will be compressed, burst, and damage the surface of the parts, resulting in insufficient pressure and power Drop etc.


Air can also degrade hydraulic oil, causing abnormally high temperatures 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, 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 a high place 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. In conclusion, everyone knows the countermeasures for the failure caused by the air entering the hydraulic system! The maintenance of the hydraulic system must be meticulous. Especially when the old excavator replaces the accessory device, it is easy to get into the air when disassembling the hydraulic device, so the exhaust must be done well to avoid the occurrence of failure.

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