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Question: When is it OK to over-lubricate your bearing?

Answer: NEVER!!!!, (almost) the exception is when high vibration exists.

If you attended the SDT/LUDECA Acoustic Lubrication Workshops then you now understand grease as a lubricating mechanism. You understand that the Churning Phase of the lubrication task is inevitable, and long-term, detrimental to the health of the grease. Therefore, we want to move as quickly as possible from the Churning Phase to the Bleeding Phase. This is the natural progression of precision lubrication.

Grease is not a robust grease mechanism. It is actually quite fragile compared to an oil only system. But we need grease as a lubricating mechanism in bearings because the properties of grease help to keep the lubrication in and around the warzone while sealing out contaminants.

Vibration is inherent in every machine system. Excessive vibration however, negatively impacts the ability of grease to lubricate. Some machine systems are intentionally vibrated as part of their function and process. Other equipment vibrated excessively because of a defect such as imbalance, misalignment, poor installation, or poor workmanship. For these machines, it might be best practices to over-grease their bearings.

I know that sounds counter to what we teach and know, but consider this. It is better to have thickener and oil in the warzone of the bearing, than it is to set up a bleeding mechanism and have the reservoir destroyed because of high vibration. If we let this happen we may never get any oil where it’s needed.

High vibration? Slightly over grease your bearing and allow a little thickener to exist in the warzone. It is the best compromise.

Download our 5-Step Acoustic Lubrication Procedure.

by Yolanda Lopez

Condition Monitoring Expert Tip #9 by Mobius Institute
No, sadly, that may not be correct. If the spectrum (and phase readings) indicate misalignment, then the machine will be misaligned. But if there is no indication of misalignment, the machine may still be misaligned. I know that may not make sense, but unfortunately it is true.

A number of experiments have been performed where real machines were misaligned and the vibration pattern did not change. The vibration pattern depended upon the type of coupling and other conditions, but the bottom line is that the only way you can be sure that the machine is precision aligned is to precision align the machine with a laser alignment tool.
We appreciate Mobius Institute for allowing us to share this tip with you!

by Ana Maria Delgado, CRL

Equipment vibration levels and bearing life are directly correlated. Many studies have established this link. Increased vibration levels due to misalignment,  unbalance,  looseness and other factors will greatly reduce the life span of bearings and other critical components within your equipment. It is not the amount of vibration that affects bearing life, but the forces that cause this vibration. These dynamic forces are propagated into components like bearings, reducing their life span. Reducing vibration levels means that the forcing functions are reduced/eliminated and bearing life is improved as a result.
Reducing vibration levels in your equipment will decrease the maintenance efforts required to keep it running, improve uptime and save your company money. These savings can be used to help justify your condition monitoring and reliability efforts as well.
Eliminate vibration before it kills your equipment, production and profits.
 

by Trent Phillips