Before installing the bearings, they should be cleaned with gasoline or kerosene, dried before use, and ensure good lubrication. Bearings are generally lubricated with grease or oil. When using grease lubrication, lubricating grease with superior properties such as impurity free, antioxidant, rust proof, and extreme pressure should be selected. The filling amount of lubricating grease should be 30% -60% of the bearing and bearing box volume, and should not be too much. The double row bearings with sealed structure and the water pump shaft connecting bearings have been filled with lubricating grease and can be used directly by users without further cleaning.

When installing bearings, equal pressure must be applied on the circumference of the ring end face to press the ring in. Do not use tools such as hammers to directly hit the bearing end face to avoid damaging the bearing. In the case of small interference, the end face of the bearing ring can be pressed with a sleeve at room temperature, and the sleeve can be struck with a hammer to evenly press the ring in through the sleeve. If installed in large quantities, hydraulic presses can be used. When pressing in, it should be ensured that the outer ring end face is tightly pressed against the outer shell shoulder end face, and the inner ring end face is tightly pressed against the shaft shoulder end face, without any gap allowed.

The installation of bearings must be carried out under dry and clean environmental conditions. Before installation, the mating surface of the shaft and housing, the end face of the shoulder, the groove, and the machining quality of the connecting surface should be carefully checked. All mating connection surfaces must be carefully cleaned and deburred, and the unprocessed surface of castings must be cleaned of molding sand. When the interference fit is large, oil bath heating or sensor heating of the bearing can be used for installation, with a heating temperature range of 80 ℃ -100 ℃ and a maximum of 120 ℃. At the same time, nuts or other appropriate methods should be used to tighten the bearings to prevent the width direction shrinkage of the bearings after cooling, which may cause a gap between the collar and the shaft shoulder.

After the installation of the bearing, the clearance should be adjusted. The clearance value should be determined specifically based on different operating conditions and the size of the interference fit. If necessary, experiments should be conducted to determine. The clearance of the double row roller bearing and the water pump shaft connecting bearing has been adjusted at the factory, and there is no need to adjust them during installation. After the installation of bearings, a rotation test should be carried out. Firstly, it should be used to rotate the shaft or bearing box. If there are no abnormalities, power should be used for no-load and low-speed operation. Then, depending on the operation situation, the rotation speed and load should be gradually increased, and noise, vibration, and temperature rise should be detected. If any abnormalities are found, the operation should be stopped and checked. Delivery can only be made after the operation test is normal.

Contact fatigue failure is one of the common failure modes of various bearings, which is caused by the repeated action of cyclic contact stress on the bearing surface. The contact fatigue peeling on the surface of bearing parts is a process of fatigue crack initiation, propagation, and propagation. The initial contact fatigue crack first arises from the larger orthogonal shear stress below the contact surface, and then extends to the surface to form pitting or small flake peeling, the former being called pitting or pitting peeling; The latter is called shallow peeling. If the initial crack occurs at the junction of the hardened layer and the core, causing early peeling of the hardened layer, it is called hardened layer peeling. It is one of the common failure modes on the surface of various types of bearings. The relative sliding friction between bearing components causes continuous loss of surface metal, which is called sliding friction loss. Continuous wear will cause changes in the size and shape of the parts, increase the clearance between bearings, deteriorate the working surface morphology, and thus lose rotational accuracy, making the bearings unable to function properly. The forms of sliding wear can be divided into abrasive wear, adhesive wear, corrosion wear, micro motion wear, etc. Among them, the common ones are abrasive wear and adhesive wear.