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Product information

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Recommendations

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Product data Page ............. 3 Lubrication Page ............. 32

Lubrication and maintenance

âž” fig ).This significantly increasesthe service life of the oil, helping toavoid frequent oil changes. The circulation can be produced bya pump. Adequately dimensioned ducts must allow the oil to leave the arrangement after passing through the bearing.An intermediate form of oil lubrica-tion is one where the oil is splashed up from the oil bath by other components, e.g. gears in a gearbox. âž” section“Lubricants and lubricationequipment” on Circulating oil
Fig 1 page 60 ). In the circulating system, the oil can be continuously filtered and/or cooled (

Oil lubrication Grease lubrication

For oil lubrication of spherical rollerbearings, oil bath and circulating oil lubrication are the two main options. Today’s modern greases allow an increasing number of maintenance- free bearing applications which are lubricated for life. Here, the selection of sealed SKF spherical roller bearings is the optimum choice, both technically and economically. These bearingsare filled with the SKF lithium base grease LGEP 2 before leaving the factory ( Relubrication âž” Table ) and are ready to mountand operate.In cases where the operating condi-tions are so harsh that very frequent relubrication is needed or where sealed SKF spherical roller bearings are not available, SKF offers a full range of greases and tools to enable proper lubrication of the bearing ( It is only possible to determine the time at which relubrication is required based on statistics. The definition used by SKFfor the recommendations regardingrelubrication intervals relates to a time at which 99 % of the bearings are still reliably lubricated, i.e. they correspond to an L Oil bath âž” fig ). The oil, which ispicked up by the rotating components of the bearing, is distributed within the bearing and then flows back to the oil bath.The oil level should be such that italmost reaches the centre of the lowest roller when the bearing is stationary. The speed ratings for oil lubrication given in the product tables apply to this method of lubrication. Even under optimum operating conditions, the oil must be changed at least once a year. This is the most simple method of oil lubrication (
1 1 Spherical roller bearing application lubricated by oil bathSpherical roller bearing application lubricated by circulating oil 2 Fig 2 1 grease life which is the relubri-cation interval t
f . The L
10 grease life isapproximately twice the L
1 life.If the L
10 grease life corresponds to,or exceeds, the L
10 life of the bearing,the bearing may be considered as being lubricated for life, and relubrica- tion will not be required.The following recommendations arebased on the results of long-term tests in various applications. They do not apply where water and/or particulate contaminants can penetrate the bearing arrangement. In such cases it is advis- able to replenish or renew the grease fill in the arrangement more frequently to remove moisture or other contamin- ants. 28