Sany Heavy Industry Co., Ltd.: Maintenance of thousands of questions | Hydraulic system mixed with air must not be indifferent!

Hydraulic system is in the process of energy and signal transmission.，The hydraulic oil is required to have good rigidity and continuity，If there is air in the hydraulic system，Will lose its inherent stiffness and continuity，The stability and reliability of the hydraulic system cannot be guaranteed.。

After air is mixed into the hydraulic system，It will cause the following five hazards.：1.Rigidity of hydraulic oil decreases sharply，Cause the hydraulic system to respond more slowly，The efficiency is reduced，Cause the actuator to creep、Vibration。2.Bubbles can prevent the formation of an oil film between moving parts.，Causes poor lubrication，Aggravate the wear of hydraulic components。3.Air contains a certain amount of oxygen.，Accelerated oxidation of hydraulic oil and system components。4.High temperature can be generated after the bubbles are pressurized，This will cause the hydraulic oil to heat up。5.Pressure shock caused by the explosion of bubbles after high pressure，Causing cavitation of hydraulic component。The above five hazards can cause hydraulic system failure.，Shorten the service life of hydraulic components。
To prevent air from entering the hydraulic system，There are several precautions to be taken：1.If air bubbles are generated due to carelessness during refueling, they are carried into the tank and mixed into the system.。Special components shall be set in the oil tank.，Reduce the formation of bubbles in the system。A partition shall be provided between the oil return pipe and the suction port of the hydraulic pump.，A bubble separation net is arrange above that oil suction pipe.，About 90% can be separated%Bubbles。2.Loose joint or oil seal、Air is sucked due to damage of sealing ring。The hydraulic system shall have good tightness.，The joints shall be securely fastened.，And make sure that the oil tank is well sealed.，This prevents outside air from entering and contaminating the system。3.The oil suction pipeline and the pipeline connecting the system are worn through.、To let in air by chafing or corroding.。Hydraulic system structure shall be reasonably designed.，Rationalize the pipeline layout;Keep the pipeline clean.，Reduce external corrosion。4.Ensure that the hydraulic oil level in the hydraulic oil tank is above 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 shall not be lower than the lower scribed line.，It should be best in the middle.。5.After hydraulic component replacement，Open the vent to the component，Uch as a hydraulic main pump，One of the ports can be selected to open at the highest point，Exhaust by adding hydraulic oil。6.Hydraulic tank cap mounted breather valve，It should be checked regularly，Clear。Prevent the breather valve from blocking the oil passage due to dust，Affects hydraulic tank air bleed。

There are thousands of questions about maintenance，You ask, I answer.，If you have any other maintenance related questions.，You are welcome to leave a message in the comment area.。

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