When the pump truck generates heat, the temperature will increase accordingly, and the sealing performance of the components of the hydraulic system will deteriorate. In severe cases, the sealing function will fail, and there will be a risk of leakage. When the hydraulic system heats up, the viscosity and lubricating function of the working fluid will also be reduced, and the wear of the hydraulic components will increase, resulting in a reduction in the life of the hydraulic components. Due to the different materials of hydraulic valve parts, the coefficient of thermal expansion is different. The valve core will be stuck between the valve core and the valve body due to thermal expansion, which will cause the small concrete pump truck to fail to work normally. In order for the small pump truck to bring better economic benefits to customers, it is necessary to do not work for a long time in normal use, to cool down the equipment frequently, and to adopt different methods to deal with different heating phenomena. It can prolong the service life of the pump truck.