The motor bearing running sleeve problem is mainly two kinds: one is the bearing running outer sleeve, one is the bearing running inner sleeve. The so-called bearing running jacket is the bearing outer ring and bearing room between the relative displacement, resulting in deviation; and running the inner sleeve is the bearing inner ring and journal between the relative displacement, the two only occurred in different locations. However, regardless of whether it is a running inner sleeve or a running outer sleeve, the motor will not run normally after the deviation occurs, causing damage to the motor. (1) The reason why the bearing runs jacket is mainly due to the following aspects. One, the motor overhaul disassembly end cover uneven force, resulting in the outer wall of the bearing wear, outer ring and bearing chamber with the fit between the loose. Second, there are cracks at the bearing chamber of the motor end cover. Third, there is a deviation when the motor is connected to the machinery to find the righting. Fourth, the motor assembly, the installation of the end cover screws when the force is not uniform. These are some of the reasons for the bearing running jacket, these reasons are also attributed to the installation of uneven force and installation without attention to detail caused by the problem. (2) cause the motor bearing run inside the jacket of the reasons also have the following kinds of. First, regular cold dismantling, cold installation, resulting in loosening between the bearing and the bearing neck. Second, the use of demolition tools to dismantle the bearing, there is no pad protection block at the top of the tie rod, resulting in damage to the central shaft hole of the rotor. Thirdly, the bearings are not heated and installed according to the prescribed temperature during installation.