Micropitting: The Silent Killer of Gearboxes

Gearboxes are built to endure. They operate under high loads, extreme temperatures, and constant motion. Yet even the toughest gear systems can be quietly compromised by a subtle, often invisible form of wear: micropitting.

Micropitting begins as an almost invisible form of surface fatigue but can progress into severe efficiency loss, eventual increased noise, and potentially catastrophic failure. Addressing it requires more than just strong hardware—it calls for advanced chemical solutions that are compatible with today’s materials.
 

What Is Micropitting and Why Does It Happen?

Micropitting occurs when repeated stress cycles create microscopic cracks on gear tooth surfaces. These cracks are often invisible to the naked eye but can grow over time. Common causes include insufficient lubrication, poor film formation, surface roughness, and high contact stress between gear teeth.

As end users demand greater productivity and output, modern gearbox designs have made these conditions increasingly common, especially in systems operating under high loads or featuring compact designs with limited oil capacity.  
 

The Cost of Micropitting

Unlike macropitting, which is dramatic and easier to detect, micropitting is insidious. It often goes unnoticed until it’s too late, when vibration intensifies, noise levels rise, and gear performance declines.

The consequences of micropitting go beyond surface damage. It can lead to:

• Increased friction and heat generation
• Accelerated wear and shortened gear life
• Reduced energy efficiency

This can ultimately lead to unexpected downtime and costly repairs. For OEMs and end users, micropitting is a reliability risk. For lubricant formulators, it poses a performance challenge that must be addressed.
 

The Role of Additives in Prevention

Preventing micropitting requires the right viscosity, a high-quality base oil, and a carefully engineered additive package that can form a resilient protective film, resist oxidation, and maintain performance under extreme conditions.

Our advanced gear oil additive technology is designed to address those challenges. It provides robust surface protection, excellent thermal stability, and proven performance in both lab and field environments.

Through this multi-layered approach of bench testing, such as the FZG Micropitting test, with demanding real-world field trials, we demonstrate how our additive technologies are developed to deliver superior performance. End users and OEMs can have confidence that their gearboxes are protected with fluids that exceed OEM specifications.
 

Conclusion

Micropitting may be silent, but its consequences are loud—downtime, repairs, and lost productivity. With our advanced gear oil additive technology, Afton Chemical offers solutions that protect gear surfaces before damage begins. In a world of increasingly compact and high-load gearboxes, proactive protection is not just smart—it’s essential.

Want to learn more about Afton’s micropitting - resistant additives or request a technical data package? Fill out the form on your left or contact your Afton representative.