In order to ensure the energy-saving and high efficiency of the sand making machine, the tension of the V-belt driven by the sand making machine should be properly adjusted to ensure the uniform stress of the V-belt. When driven by double motors, the V-belts on both sides should be matched in groups to make the length of each group as consistent as possible. Stop the machine regularly, open the observation door and observe the internal wear of the sand making machine. The wear degree of the central feed pipe, cone cap, upper and lower runner lining, circumferential guard plate and wear-resistant block shall be replaced or repaired in time after wear, and the wear-resistant block shall be replaced at the same time to ensure the same weight. It is forbidden to open the observation door to observe the internal working condition of the crusher during the working process, so as to avoid danger. Based on the basic principle, the maintenance of sand making machine should be flexible. According to the wear condition of the bearing of the sand making machine, we can judge what stage the bearing is in and whether it needs to be repaired or replaced.