Do sealed bearings need to be greased?

Greasing sealed bearings - DR - ThumperTalkIve been popping the seals and adding grease to sealed bearings for years I'll just pop the seals and make sure the bearing does have grease. a bit and will break before the seal pops which is why you need two of them

Greased up sealed bearings | Singletrack Magazine ForumAnd there was me thinking that sealed bearings don't need grease because they Certainly I do not grease sealed bearings nor slap grease outside of them To Grease or Not to Grease - Reliable PlantUseful in smaller motors, sealed bearings can have a much reduced service life lubrication engineering logic to calculate both the required regrease quantity 

Do 'sealed' bearings still need grease?: Triathlon ForumIn general it is fine to clean the exterior of the bearings unless you see a substantial amount of lubricant being expelled from the bearing, in which 

Sealed or Shielded Bearings? How to Tell the DifferenceThere is a difference between shielded and sealed bearings. You can regrease a shielded bearing, but you should not be regreasing a sealed bearing. as to why grease fittings are installed on bearings and motors that have sealed bearings ADDING GREASE TO SEALED BEARINGS - TractorByNetAug 28, 2007 — Now I just use an oil can. By the time the bearing gets old the seal is shot too. Oil seeps right in. If it's a bearing I want and need to last I use 

Sealed bearings clean and cost efficient - SKF EvolutionThis requires enormous consumption of lubricant. A single slab caster can consume up to 50 tonnes of grease annually. With sealed spherical roller bearings, How Grease Kills Bearings - Machinery LubricationSome of this oil entered the bearing race providing needed time-released lubrication. Hydrostatic forces from a grease gun can reach levels exceeding 15,000 psi (103,421 kPa) - more Instead, it detours out the shaft seal or the vent port

Re-assessing lifetime lubricated sealed bearings - PumpApr 16, 2015 — This stone applied the pressure needed to force the tallow or grease For sealed bearings with mineral oil-based greases, Figure 1 can still be The Three Mistakes of Bearing Lubrication - ApplicationsMay 19, 2016 — Can it be true that 40 percent of bearings never live to their engineered life Bearings need grease for one reason only, to reduce friction