1.Select hydraulic fluids with concrete antifreeze。In summer and winter, different types of hydraulic oil need to be applied, and the efficacy and characteristics will be different。At ultra-low temperatures, if the summer hydraulic oil is applied, it will condense, become more and more viscous, and even freeze and freeze without application。Therefore, the winter application is a professional addition of concrete antifreeze winter hydraulic oil.This type of hydraulic oil can be integrated into the ultra-low temperature natural environment, and it is not easy to lose characteristics due to too low temperature。Therefore, different models and specifications of hydraulic oil need to be applied under different standards。