Key points for bearing loading and unloading

The following points shall be paid attention to when applying force during bearing assembly and disassembly:
(1) The resultant force of the force shall pass through the axis of the bearing as far as possible, which requires that the force application point shall be uniform, symmetrical and stable, and the force shall be applied through the spherical surface or parallel to the axis.
(2) The force should be applied stably and evenly without impact, which requires the use of oil pressure or tools that can apply stable tension or pressure. When hammering has to be used, it should also be buffered by soft metal such as copper sleeve without chip falling, and the knocking force should be as light as possible. It is best to hammer with a copper rod or hammer.
(3) Avoid applying force through the rolling element, which requires applying force through the inner ring when installing and removing the inner ring (shaft ring) and through the outer ring when installing and removing the outer ring.
(4) The drag force shall be maintained to a proper extent. For example, when installing the bearing, stop the force when the bearing is just installed in the correct position, and ensure that the end face of the ferrule (washer) is against the seat hole or the shoulder end face of the shaft, which can not be squeezed too tightly or installed in place.
The bearing must be installed under dry and clean environmental conditions. Before installation, carefully check the machining quality of the mating surface of the shaft and housing, the end face of the shoulder, the groove and the connecting surface. All mating connection surfaces must be carefully cleaned and deburred, and the unprocessed surface of the casting must be cleaned of molding sand.
The bearing shall be cleaned before installation and used after drying, and good lubrication shall be ensured. The bearing is generally lubricated with grease or oil. When grease lubrication is used, grease with excellent properties such as no impurities, oxidation resistance, rust prevention and extreme pressure shall be selected. The filling amount of lubricating grease shall be 30% - 60% of the volume of bearing and bearing box, and shall not be too much. Double row tapered roller bearing with sealing structure and water pump shaft connecting bearing have been filled with grease, which can be used directly by users and can not be cleaned.
During bearing installation, equal pressure must be applied on the circumference of the ferrule end face to press the ferrule in. It is not allowed to directly knock the bearing end face with hammer and other tools to avoid damaging the bearing. When the interference is small, press the end face of the imported bearing ring with the sleeve at room temperature, knock the sleeve with a hammer, and press the ring evenly through the sleeve. In case of mass installation, hydraulic press can be used. When pressing in, ensure that the end face of the outer ring and the end face of the housing shoulder, and the end face of the inner ring and the end face of the shaft shoulder are pressed tightly without clearance.