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How to avoid the problem of unstable speed of the four-column hydraulic machine master cylinder?

In order to avoid the problem that the speed of the master cylinder of the four-column hydraulic machine is unstable, it is necessary to do the following points. The specifics are as follows: First, the amount of hydraulic oil used should be sufficient, and second, avoid problems such as deterioration of oil. Third, to avoid problems such as blockage of the oil pump, it can be used normally, and the fourth is to ensure that the oil pump seal can be used normally and has good sealing performance.