What Is Axle Box Device? How To Maintain It?
What Is Axle Box Device? How To Maintain It?
2021年12月18日
Technical Indexes Of High Precision Set Sleeve
Technical Indexes Of High Precision Set Sleeve
2021年12月18日

Inspection Method For Deterioration Of Bearing Grease

In the process of using bearings, grease is often critical for non NTN bearings. If deteriorated grease is used, it will not only fail to play its due role, but also damage the bearing.

① Oil flow observation method

Take two measuring cups, one containing the lubricating oil to be inspected and the other empty on the table. Lift the measuring cup filled with lubricating oil 30-40 cm away from the table and tilt it to let the lubricating oil flow slowly into the empty cup, and observe its flow. The lubricating oil with good quality should flow slender, uniform and continuous. If fag bearing oil flow is fast and slow, If large pieces of oil flow down from time to time, it means that the lubricating oil has deteriorated.

Inspection Method For Deterioration Of Bearing Grease
② Hand twisting

Twist the lubricating oil between thumb and index finger and grind it repeatedly. A better lubricating ina bearing lubricating oil hand feels lubricity, less wear debris and no friction. If it feels a large friction feeling such as sand particles between fingers, it indicates that there are many impurities in the lubricating oil and can not be used again. It should be replaced with a new lubricating oil.

③ Illumination method

On sunny days, lift up the lubricating oil with a screwdriver at an angle of 45 degrees to the horizontal plane. Observe the oil drops according to the sunlight. In the light, it can be clearly seen that there is no wear debris in the lubricating oil. It can continue to function. If there are too many wear debris, replace the lubricating oil.

④ Oil drop trace method

Take a clean white filter paper and drop several drops of oil on the filter paper. After the lubricating oil leaks, if there is black powder on the bearing surface of table NSK and there is a sense of astringency by hand, it indicates that there are a lot of impurities in the lubricating oil. Good lubricating oil has no powder. It is dry and smooth by hand and shows yellow traces.