The specific method of judging whether the bearing should be reported for repair, that is, the specific method of judging whether the bearing has been fully utilized and the damage is approaching is as follows: 1) Use the bearing working condition monitoring instrument such as ferrograph or SPM or I-ID-1 type bearing to work It is the most convenient and reliable method to judge the working state of the bearing and determine when the bearing should be repaired by using a condition monitoring instrument. For example, when using the HD-1 type instrument, when the pointer approaches the danger area from the warning area, but the pointer does not return after taking measures such as improving lubrication, it can be determined that the problem is the bearing itself, and you can take advantage of it before entering the danger area. When the bearing is repaired. How far from the danger zone to start repairing can be adjusted by experience. Using such an instrument, the working potential of the bearing can be fully utilized, the bearing can be repaired in time, and failures can be avoided, which is safe and economical. 2) Use simple tools to monitor In the case where the above instruments are not available, the operator can hold a tool such as a round bar or a wrench against the part of the machine casing closest to the bearing, and shame the ear on the tool to monitor the running sound of the bearing from the tool. Of course, It is also possible to use a medical stethoscope retrofit. The normal bearing running sound should be a uniform, smooth and not harsh sound, while the abnormal bearing running sound has a variety of intermittent, impactful or harsh sounds. First of all, you must get used to the normal bearing running sound, then you can grasp and judge the abnormal bearing running sound, and then through the accumulation of practical experience, you can further analyze what kind of abnormal sound corresponds to what kind of bearing abnormal phenomenon . There are many types of abnormal sounds of bearings, which are difficult to describe, mainly relying on experience accumulation.