How can I tell if a bearing lubricant has deteriorated?

Lubricants are very important to the operation of bearings and the quality of the lubricant is directly related to the service life of the bearing, especially for precision bearings which have higher requirements for lubricants. If the quality of the lubricant is poor or deteriorating it will directly affect the work and life of the bearing, so it is important to ensure that the lubricant does not deteriorate. The importance of lubricants to bearings naturally goes without saying, so when using bearings you should always check the lubricant to ensure that the grease has not deteriorated. However, some friends do not know how to judge whether the bearing lubricant is deteriorating, today we will give you several ways to identify whether the bearing lubricant is deteriorating.

1、Oil drop trace method　

Take a clean white filter test paper, drop several drops of oil in the filter test paper, to be lubricant leakage, if the surface has a black powder, touch with the hand has blocked astringent feeling, it means that the lubricant inside impurities have been a lot, good lubricant without powder, with the hand touch up dry and smooth, and is yellow traces.

2、Oil flow observation method

Take two measuring cups, one of which holds the lubricant to be checked, the other empty on the table, the measuring cup full of lubricant will be lifted high off the table 30-40cm and tilted, let the lubricant slowly flow to the empty cup, observe its flow, good quality lubricant oil flow should be thin, even, continuous, if the oil flow is fast and slow, and sometimes there is a large piece of flow down, it is said that the lubricant has deteriorated.

3、Hand twisting method

The lubricant will be twisted in the thumb and forefinger between repeated grinding, better lubricant hand feel lubricity, less abrasive, no friction, if feel between the fingers of the sand particles such as larger friction feeling, it indicates that the lubricant within the impurities, can not be used, should be replaced with new lubricant.

4、Lighting method

On a clear day, use a screwdriver to lift up the lubricant and make an angle of 45 degrees with the horizontal surface. Against the sun, observe the oil droplet situation, in the light, can clearly see the lubricant without abrasive chips for good, can continue to function, if abrasive chips too much, should replace the lubricant.

The above is about how to judge whether the bearing lubricating oil is deteriorated method introduction, good quality lubricating oil oil flow slender, uniform, continuous; if appear flow speed is fast and slow, and sometimes have big block flow down, it means the lubricating oil has deteriorated. Bearing lubricating oil after deterioration is dark black, foam more and has appeared emulsification phenomenon, with finger grinding, no sticky feeling, astringent or odor, drop in white paper is dark brown, no yellow infiltration area or a lot of black spots. If not replaced in time will accelerate the wear and tear of parts, affecting the service life, and even safety accidents.