Fault phenomenon: It affects the working efficiency of the hydraulic system, the response speed becomes slow, the pressure is unstable, and the actual work is sometimes 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, there will be 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, component damage is prone to occur. Small air bubbles mixed in the hydraulic oil will be compressed, burst, and damage the surface of the component, resulting in insufficient pressure and power. Drop and so on.
Air will also deteriorate the hydraulic oil, causing 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 large amount 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 a high place and add hydraulic oil to exhaust.
The breathing valve installed on the hydraulic oil tank cover should be inspected 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. To sum up, 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 is replacing the accessory device, it is easy to disassemble the hydraulic device to enter the air, so the exhaust must be done well to avoid the occurrence of failure.