Grease is critical in the use of TIMKEN bearings.If deteriorated grease is used, it will not only fail to function as it should, but also damage the bearing.
1. Oil flow observation
Take two cups, one of which need to be checked out of the lubricating oil, empty on the desktop, the other will be filled with lubricating oil measuring cup for leave desktop 30 to 40 cm tall and lean, let oil flow slowly to the empty cup, to observe the flow situation, when good quality lubricant oil flow should be long and thin, uniform, continuous, if appear oil flow fast and slow, sometimes with large flow, the said lubricating oil has deteriorated.
2. Hand twist method
Twist the lubricating oil between the thumb and the index finger repeatedly grinding, the better lubricating oil hand feel lubricity, less abrasive, no friction, if feel between the fingers of sand and other greater friction sense, it shows that the impurities in the lubricating oil, can not be used again, should replace the new lubricating oil.
3. The illumination method
On a clear day, lift the oil with a screwdriver at a 45-degree Angle to the water level.Compare with the sun, observe the oil droplets, under the light, you can clearly see that the lubricating oil without debris is good, can continue to function, if the debris is too much, should replace the lubricating oil.
4. Oil drop trace method
Take a piece of clean white filter paper and drop a few drops of oil on the filter paper. After the oil leaks, if there is black powder on the surface and there is a feeling of astringence when touched by hand, it indicates that there are many impurities in the oil. The good oil has no powder, and it feels dry, smooth and yellow.
The TIMKEN bearing can be removed from its oil seal pack shortly before delivery for routine inspection and immersed in washing gasoline or acid-free kerosene containing 3% oil, turn its outer ring and carefully rinse the junction of the cage, roll and racetrack, requiring any hidden areas to be thoroughly cleaned of original oil stains.After cleaning, TIMKEN bearings should be soaked and dried with the attached cleaning oil, and then dried on the work table lined with clean neutral lining paper, or slowly dried in far-infrared oven.Do not rotate bearing rings, retainers or any rolling elements during the process of drying or drying the self-cleaning oil.
Has to dry or drying TIMKEN bearings, should be in accordance with the provisions, drip into the lubricating oil and check for immediate delivery, no oil film bearing outer surface protection, in the whole process of inspection shall not directly touch the skin of hands, the operator should wear clean gloves, or hand coated with anti-rust agent, but the rust inhibitor must avoid hand bearing with rolling surface, otherwise it will result in deviation of measurement results.
Upon the completion of inspection, TIMKEN bearings should be immediately put into use or treated with anti-rust inventory. The whole inspection process should be completed promptly to avoid rust corrosion caused by too long time.Note that cleaning with pure gasoline without oil will also cause corrosion.TIMKEN bearings must also be placed on a sheet of metal in the inspection area, together with the measuring blocks, standard parts and measuring instruments used for the inspection, before the inspection is carried out, so that the temperature of these items can be quickly homogenized and warmed.
Obviously, only strict preparation above can ensure the accuracy of the inspection results, and TIMKEN bearings will not rust during the whole inspection process.