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How we process Bearings with Cobra Solid Lubricants

CSL is a multistage process. Bearings will first be thoroughly cleaned and inspected for initial defects. The next step fills the bearings with soft mixture of Graphite and other proprietary binder products. A computer programed thermal curing process hardens this mixture within the bearing filling the space between the inner and outer races for the width of the bearing. Excess graphite is cleaned off the bearing and the bearing is put through a special run-in process. Bearings are then cleaned and quality checked. If the CSL product is to include EP or EPN, it will go through addition procedures to infuse the solidified CSL with the special EP and EPN additives. One more quality check and the bearing are then packed for shipping.

Why can’t shields be put back on

Bearing manufacturers lubricate and stake on shields at their factory. We must remove at least one shield to clean out the factory installed grease and process the bearing with CSL. We cannot re-install that shield. Special tooling is required to properly stake on a shield. If improperly staked on, the shield may come off during operation damaging machinery or at the very least, cause an unscheduled shut down to replace the bearing.

While industry standards dictate the dimensions of bearings, each bearing manufacturer has subtle differences in the size of the shields and landing grooves. Even within a manufacturers line of bearings, the bearings are sometimes made in several different countries, and often the shields for bearings made in one country won’t fit the same bearing made in another country. And spare shields are nearly impossible to come by.

So the reason we can’t do it, is it is just not practical.

The exception is for housed units with flingers which we can usually re-install and conveyor wheels which we can also install shields on.

Why can’t seals be used

Seals have two purposes: keep lubricant in; and keep contaminates out. Generally, seals are snapped into landing grooves on the inner and outer races. There are also “low drag” seals which snap into the outer race and rest on a beveled inner race. For seals to work properly the landing groove or the surface the low drag side rides on must have some liquid lubricant present to facilitate low friction drag. This liquid lubricant is not present in CSL. However, CSL needs no seal to keep the lubricant in and, depending on the size of contaminates, it may not need extra seals to keep contaminates out.
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