bearing configuration will gradually lose its lubrication performance.Therefore, the grease needs to be constantly replenished and renewed. The interval time of grease filling will vary with bearing formation, size and speed. In addition, under the condition of the bearing temperature over 70 ℃, the time interval between the supplement of the grease is reduced by half. The double-sided closed bearing has been loaded with grease during manufacture. The service life of the grease can generally exceed the service life of the bearing.