Simple detection method for KOYO bearings lacking lubricating oil

Core Tip: The normal use of KOYO bearing lubricants is brown and blue-black. If it is milky yellow, it indicates that diesel oil or water is added to the oil and should be replaced in time. If it is dark black, then the table
 The normal use color of KOYO bearing lubricants is brown and blue black. If it is milky yellow, it indicates that diesel oil or water is added to the oil and should be replaced in time. If it is dark black, it indicates that the oil has deteriorated and must be replaced in time.
The oil to be inspected is evenly mixed and dropped on a white paper (preferably a filter paper) to form oil spots, and the oil spots gradually diffuse from the center outward for about 2 to 3 hours to form three concentric rings. The state of the oil can be discerned based on the color, width and shape of the three areas.
Remove a little oil from the low shell of the oil, apply it on your fingers, and rub it with your fingers and thumb. If you feel that there is impurities in the oil or that it is not sticky like water, or even hairy or sour, the oil has deteriorated. If you can see a small shiny metal grinding on your finger after honing, it means that the engine has a serious wear part, and it also means that the oil must be replaced immediately.
1. Judging from KOYO bearing size specifications
First of all, it is necessary to focus on the KOYO bearing dimensional accuracy, rotation accuracy, internal clearance and mating surfaces, raceway surfaces, cages and seals. Then, for the result of the inspection, it can be judged by the inertial bearing or the master bearing.
2. Whether the KOYO bearing is reused
The criteria for judging the use of KOYO bearings are based on their mechanical properties and importance as well as the inspection cycle. In the event of breakage and defects in the bearing components and peeling of the rolling surface of the raceway, the bearings must not be reused and must be replaced.
In the process of using KOYO bearings, in order to be able to fully play and maintain its proper performance for a long time, regular maintenance measures should be taken. The use efficiency of the bearing can be improved by the following appropriate cleaning inspection measures.
3. Cleaning method of KOYO bearing
First remove the KOYO bearing and check it in, and make a good appearance record. Also, verify the amount of lubricant remaining and sample the lubricant before cleaning the bearings. In general, the cleaning agent used in KOYO bearings is neutral non-aqueous diesel or kerosene, and sometimes warm alkali is used as needed. Regardless of which cleaning agent is used, it is often filtered and kept clean. After cleaning the NTN bearing, it is necessary to apply anti-rust oil or anti-rust grease immediately.

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How to check if NSK bearing grease has deteriorated

Core Tip: Grease is critical in the use of NSK bearings. If a deteriorated grease is used, it will not only function as it should, but it will also damage the NSK bearing. 1
Grease is very critical in the use of NSK bearings. If a deteriorated grease is used, it will not only function as it should, but it will also damage the NSK bearing.
Illumination method
On a clear day, use a screwdriver to pick up the NSK bearing lubricant at a 45-degree angle to the horizontal. Observe the sunlight and observe the oil droplets. Under the illumination, it can be clearly seen that there is no wear debris in the bearing lubricating oil, which can continue to work. If the grinding debris is too much, the lubricating oil should be replaced.
2. Oil droplet trace method
Take a clean white filter paper, drop a few drops of oil on the filter paper. After the oil leaks, if there is black powder on the surface, touch the hand with a feeling of resistance, it means that there are many impurities in the lubricant, good lubricant No powder, it is dry and smooth by hand, and it has yellow marks.
3. Oil flow observation method
Take two measuring cups, one of which holds the NSK bearing lubricant to be inspected, the other is placed on the table, and the measuring cup filled with lubricating oil is lifted off the table 30-40 cm and tilted, so that the NSK bearing lubricant is slowly Flow into the empty cup and observe the flow. The quality of the lubricating oil should be slender, even and continuous. If there is a sudden flow of oil, sometimes there will be a large flow, then the lubricant has deteriorated. .
4. Handcuffs
The NSK bearing lubricant is rubbed repeatedly between the thumb and the index finger. The better lubricant feels lubricated, less wear debris, and no friction. If you feel a large friction between the fingers, it means There are many impurities in the lubricating oil, which can no longer be used. New lubricants should be replaced.
(I) The role of NSK bearing lubrication Lubrication has an important impact on the fatigue life of rolling bearings and friction, wear, temperature rise, vibration, etc., without normal lubrication, NSK bearings can not work. Analysis of the cause of bearing damage indicates that about 40% of bearing damage is associated with poor lubrication. Therefore, good lubrication of the bearings is an effective measure to reduce the friction and wear of the NSK bearings.
(II) Comparison of grease lubrication and oil lubrication The lubrication methods of NSK bearings are roughly classified into two types: grease lubrication and oil lubrication. In order to give full play to the function of the NSK bearing, it is important to use a lubrication method depending on the purpose of use reduction and use.

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