Type of failure: (1) bearing rotation is difficult and heating (2) bearing operation has abnormal sound (3) bearing vibration (4) Inner seat ring spalling and cracking (5) Outer seat ring spalling and cracking (6) Bearing raceway and rolling body produce indentation

1、Method of percussion The knocking force is generally added to the inner ring of the bearing. The knocking force in the shielding room should not be added to the rolling body and retaining frame of the bearing. This method is simple and easy to use, but it can easily damage the bearing. The application of this method should pay attention to the placement of the pad should be appropriate, the point of emphasis should be correct. 2、Hot separation process Used to remove tight fit bearings. First, the oil heated to about 100℃ is poured on the bearing to be removed with an oil can. After the bearing ring is heated and expanded, the bearing can be pulled out with a tension tool. 3、Push and press method Press the bearing, stable and reliable work, no damage to the machine and bearing shielding machine room. The press has manual press, mechanical or hydraulic press press. Note: The pressure point of the press should be on the center of the shaft, and the pressure should not be biased. 4、Pull out method Special tension, disassembly, as long as the rotation of the handle, the bearing will be slowly pulled out. When removing the outer ring of the bearing, the Angle of the two legs of the puller should be opened outward; When disassembling the bearing inner ring, the two feet of the puller should be inward and stuck on the end face of the bearing inner ring.

1. When fully loaded needle roller bearings are installed, auxiliary sleeves are used; 2. The auxiliary roller or auxiliary sleeve supports the needle to prevent the needle from falling out, and the journal lifts the needle with its own chamfer; 3. With the needle roller bearing slowly moving inward on the journal, the auxiliary roller or auxiliary sleeve will slowly exit until it is installed to the working position. 4. The outer diameter of the auxiliary roller and auxiliary sleeve should be 0.1-0.3mm smaller than the diameter of the shaft. During installation, grease the inner surface of the bearing outer ring first, and stick the roller needle tightly against the inner surface (there should be a clearance when putting the last needle). 5. Then push the auxiliary roller or auxiliary sleeve that replaces the journal or bearing inner ring into the outer ring hole, and align its end face with the end face of the mounting shaft or the end face of the bearing inner ring installed on the shaft. Pressure is then applied by tapping with a press or hand hammer.