Is Overgreasing Dangerous?

Team Minimac

Feb 24, 2022 · 2 min read

Greasing is an important process that ensures the smooth functioning of machines. Let’s understand these two aspects first - Overgreasing and Undergreasing. To determine which of these is more problematic could be difficult but we can definitely decide which one is more damaging. Too much grease can generate excessive heat in the bearing and may result in seal failure. When the lip seals rupture because of over greasing, it allows the harmful contaminants to enter the bearing housing. This would create excessive pressure and may collapse the bearing race. On the other hand, not putting enough grease may cause damage to the rotating parts. Undergreasing allows contaminants to enter the load zones. We can say that it's better to avoid both aspects of over and under greasing.

How to determine the amount of grease a bearing needs?

The factor responsible for determining the right amount of grease depends on the dimensions of the bearing or its housing. Greasing must be done based on proper calculations. A formula that is used commonly is as follows:

The outside diameter of the bearing is multiplied by the width (in inches), then multiply the answer by 0.114. This would give you the amount of grease in ounces required for that particular bearing.
For example -
If the outside diameter of a bearing is 3 inches and the width of a bearing is 0.5 inches, then
3 X 0.5 = 1.5
1.5 X 0.114 = 0.17
Thus, The amount of grease needed is 0.17 ounces or 4.8 grams.

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How to solve the problem of Overgreasing?

After having a grip on how much grease to put, try to master the frequency. Take help from various tables and charts available for determining the frequency. Calibrating the grease guns could be a simple and easy step to determine the correct volume of grease. It is very important to discontinue greasing when any abnormal pressure is encountered. Manual grease guns used in the industry have a few disadvantages. The poor control of grease guns may lead to over/under lubrication. Because they are low in cost, easy to use, and allow the technicians to inspect the equipment during the tasks, industries prefer using manual grease guns.

Setting up a maintenance program could be a game-changer. Keep a track of each grease point and schedule maintenance & inspections for the same. Initially, it may take some time and effort but the end result would be great and impactful.

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