When is grease lubrication of bearings recommended?
The use of grease is primarily limited to lower horsepower, rolling element bearing applications (Image 1). Grease is usually lithium, with a normal viscosity of 100 centistokes, and it is usually limited to a service temperature of 93 C (200 F). To prevent the loss of grease and minimize the entrance of contaminants, shielded bearings may be used.
Advantages & Disadvantages to Grease Lubrication
Advantages to grease lubrication include:
- less sensitivity to level pump installation
- simplified maintenance
Disadvantages to grease lubrication include:
- Limited heat dissipation
- Overpressurization during regreasing can damage bearing shields. Therefore, follow manufacturer procedures to prevent overpressurization.
- Grease used with sealed bearings can have higher frictional heat leading to accelerated oxidation of the grease.
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