As is well known, regularly replacing hydraulic oil for hydraulic jacks is the main reason for ensuring their smooth operation. However, what most people cannot understand is why it is necessary to replace hydraulic oil for hydraulic jacks? How can hydraulic oil change its own state when it is in a sealed and isolated environment, unaffected by any external factors? Why bother with replacement?

In fact, this matter is not difficult to understand. Firstly, the perception that hydraulic oil is completely isolated from the outside world is incorrect. Even if hydraulic oil is not affected by external impurities, it will still be affected by temperature, radiation, and agitation during long-term use. Moreover, the sealing performance of hydraulic jacks has not reached the level of complete isolation. With long-term use, extremely small impurities will still accumulate and invade, causing changes in the state of hydraulic oil.

The physical and chemical changes of hydraulic oil are caused by various factors including air, moisture, impurities, etc. The changes in oil performance are reflected in the increase of mechanical impurities, the increase or decrease of viscosity, the decrease of flash point, significant changes in acidity, deterioration of emulsification resistance, and deterioration of saturation resistance. The smoothness of the operation of the jack is not as good as before, and there is no question about whether it will be scrapped. So the hydraulic oil of the hydraulic jack must be replaced.