When bearing is difficultly mounted,bearing heating and bearing housing heating can be one before mounting,but took notice that. 

1.Spherical plain bearings must not be heated above +130℃,higher temperatures damage the seals. 

2.Spherical plain bearings must not be heated in an oil bath,unless: 

①This impairs the triological system of maintenance-free bearings. 

② It changes the molybdenum disulphide concentration on the surfaces in bearing with a steel/steel sliding contact surface. 

3.Bearings must not be heated using a naked flame,unless: 

① The material undergoes excessive localized heating and its hardness is reduced. Futhermore ,stresses are induced in the bearing. 

② The seals could melt. 

③ Maintenance-free sliding surfaces could be damaged.