What is the role of lubrication in bearing life and what is a basic lubrication interval concept?

• A. Proper lubrication reduces friction and wear; intervals should be based on manufacturer specs, operating conditions, and oil cleanliness, not just time.
• B. Lubrication only cools the surface.
• C. Lubrication intervals should be every week regardless of conditions.
• D. Lubrication is optional for most bearings.

Answer: (A)

Lubrication’s job is to keep the bearing surfaces separated by a lubricant film, which reduces friction and wear, carries away heat and contaminants, and helps prevent corrosion. Maintaining that film is what protects bearing life; when the film breaks down or gets contaminated, metal-to-metal contact accelerates wear and can lead to early failure. The effectiveness of lubrication depends on factors like load, speed, temperature, and the level of cleanliness in the system, so the lubrication approach must respond to those conditions rather than follow a rigid schedule.

A basic lubrication interval concept is that intervals aren’t determined solely by time. You start with manufacturer specifications, but you tailor intervals to operating conditions and oil cleanliness. High temperatures, heavy or variable loads, dusty or dirty environments, or inadequate filtration will shorten the useful life of the lubricant and require more frequent checks or changes. Regular oil-condition monitoring—looking at viscosity, contamination, water content, and additive depletion—helps you decide when to re-lubricate or replace the oil. In short, keep the lubricant film healthy by aligning maintenance with how the machine actually runs and how clean the oil remains, not just by ticking off a calendar.