Before the operation of the metal crusher, it is necessary to strictly check whether the parts of each part are loose. Once any looseness is found, it should be fastened in time to avoid safety accidents. Check the tightness of the belt, whether the belt touches the shell or slips during operation, whether it rotates forward, etc. At the same time, inflammables and explosives shall not be put in the feeding process. In addition to checking the tightness of all parts, check those vulnerable parts, such as; Bearings, hammers, and blades. Check the wear condition in time and replace the severely worn parts in time to avoid affecting the normal production of the equipment. It is necessary to lubricate the bearing in time. Only sufficient lubrication can reduce the wear degree of the bearing and make the bearing play an efficient and powerful power.