Over greasing bearings is a much bigger problem than we realise. Over greasing is a common issue that can have detrimental effects on bearings, leading to reduced performance, premature failure, and increased maintenance costs. While grease plays a vital role in lubricating and protecting bearings, excessive grease can cause several problems. Several studies concluded that over greasing is responsible for damaging as many bearings as under-greasing.
Firstly, over-greasing results in increased friction and heat generation. When there is an excessive amount of grease in a bearing, it creates resistance to rotation. This resistance generates additional heat, which can elevate the operating temperature of the bearing. High temperatures can cause the grease to degrade, leading to a loss of its lubricating properties and the formation of abrasive particles. The increased friction and heat also accelerate wear and tear on the bearing components, reducing their lifespan.
Furthermore, over-greasing increases the internal pressure within the bearing. Excessive grease fills the available space and displaces the air, creating pressure build-up. This pressure can cause the seals to rupture or the lubricant to leak out, compromising the integrity of the bearing system.
Additionally, the excess grease can interfere with proper lubricant distribution, preventing the effective flow of grease to the critical contact areas of the bearing. Consequently, inadequate lubrication occurs in certain regions, leading to increased localised stress and wear. In extreme cases, it will stop the ball or roller from turning, which will create a scraping effect, leading to direct metal-on-metal contact inside the bearing.
Lastly, over-greasing can have financial implications. Applying excessive grease consumes more lubricant, leading to higher material and maintenance costs. Additionally, the increased wear and premature failure caused by over-greasing require more frequent bearing replacements and repairs, resulting in increased downtime and associated expenses.
In conclusion, over-greasing is detrimental to bearings due to increased friction, heat generation, pressure build-up, inadequate lubrication, and higher maintenance costs. Proper greasing practices, following manufacturer guidelines or using ultrasound assisted lubrication to ensure the right amount of grease are crucial for ensuring optimal bearing performance, longevity, and reliability. The use of environmentally acceptable lubricants is highly recommended.
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