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To analyse and solve bearing heating in hammer crusher Hammer crusher is mainly used to crush limestone and clinker matched with grate cooler in cement plant. One of the main faults in its production is bearing heating. Some of the heating phenomena occur in the initial running in period and become normal after running for a period of time. Some phenomena lasts for a long time and has a great impact on production. The main causes of heating are: improper bearing design and selection, poor processing quality of equipment parts, unqualified installation, improper selection or filling amount of lubricant, improper use, maintenance and repair, resulting in loose vibration and fit, failure to replace the bearing in time after wear, and high ambient temperature due to improper operation. This paper makes a detailed analysis of the causes and maintenance of the crusher hammer, and gives the corresponding precautions for the use of the crusher hammer.   1. Improper Bearing Design and Selection 1.1 Improper Selection of Bearings Hammer crusher belongs to heavy load equipment. It is started with heavy load when starting, and the load is heavy and has impact load when running. Therefore, two aspects should be paid special attention to when selecting rolling bearing: (1) Load selection of bearing. If the selected bearing has low rated load and serious bearing wear during operation, it will cause bearing heating and shorten its service life. (2) Selection of bearing clearance. Too small clearance is not conducive to the formation of oil film and the elimination of thermal expansion. Especially when the ambient temperature is high, too small original radial clearance will make the clearance of the bearing smaller or even zero due to the expansion of temperature rise during operation, which is easy to cause bearing heating. The clearance of rolling bearing is divided into radial clearance and axial clearance. Radial clearance is divided into original clearance, installation clearance and working clearance. The selection of clearance should consider the fit between bearing and shaft and bearing seat, the change of original clearance caused by working temperature and load. The reasonable selection of bearing clearance should be based on the original clearance and consider the change of clearance caused by fit, temperature difference between inner and outer rings and load, so as to make the working clearance close to the best state. Most of the hammer crushers are equipped with tight sleeve bearings, inner ring tapered holes, which can adjust the clearance during installation or operation. The radial clearance of tapered bore spherical roller bearings with tight sleeve is slightly larger than the radial clearance of cylindrical cylindrical roller bearings with the same group. However, for hammer crusher, with heavy load and impact load, the ring of rolling bearing is easy to deform, resulting in uneven stress on the mating surface and loose…