I. Inspection and judgment
In order to judge whether the removed needle roller bearing can be reused, it is necessary to check its dimensional accuracy, rotation accuracy, internal clearance, mating surface, raceway surface, cage and sealing ring.
The inspection results may be judged by those who are familiar with needle roller bearings or proficient in needle roller bearings.
The criteria for judging vary according to mechanical properties and importance as well as inspection periods.If the following damage occurs, needle roller bearings must not be reused and must be replaced.
A) Fracture and defect of needle roller bearing parts.
B) Peel off the rolling surface of the raceway surface.
2. When cleaning and removing needle roller bearing for inspection, make appearance records by means of photography.In addition, confirm the amount of remaining lubricant and sample the lubricant before cleaning the needle roller bearings.
A. The needle roller bearing shall be cleaned by rough and fine cleaning, and a metal net rack may be placed at the bottom of the container.
B. Remove grease or stickiness with brush in oil during rough washing.If the needle roller bearing is rotated in oil at this time, it should be noted that the rolling surface will be damaged due to foreign matter.
C. During fine washing, the needle roller bearing should be slowly rotated in oil and carried out carefully.
Usually the use of cleaning agents for neutral water - free diesel or kerosene, according to the need sometimes also use warm lye.No matter what kind of cleaner you use, filter it regularly to keep it clean.After cleaning, apply antirust oil or antirust grease to the needle roller bearing immediately.