The main cause of hydraulic oil emulsification on concrete mixer truck s is water in the hydraulic system, which is mixed with water after a long time. The removed hydraulic oil will form an emulsification of the hydraulic oil. We found that water enters the hydraulic system due to the following reasons: a. Working in a humid environment, the moisture in the air condenses due to the alternation of cold and heat, turning into water droplets and falling into the oil; b. The rainwater on the fuel tank seeps into the fuel tank due to the weak sealing of welding and connection parts; c. Due to the damage of the pumping cylinder seal and the damage of the mixing motor, moisture is brought into the oil; d. Daily maintenance, cleaning, oil change, and maintenance process bring in moisture. To prevent the oil from emulsifying, we must first prevent moisture from entering the hydraulic system. When the car leaves the factory, the welding and connection parts must be manufactured in accord...