Description

If you’ve noticed a few drops of gear oil under your Massey Ferguson, or you’re into the transmission for other repairs, this O ring is one of those small parts that can prevent big headaches. This seal maintains critical hydraulic fluid containment within the epicyclic final drive unit, preventing costly fluid loss and protecting internal components from dirt and moisture contamination. A leaking O ring might seem minor, but it lets dirt in and oil out—two things that’ll shorten your transmission’s life in a hurry.

What You’re Getting

Precision-molded rubber compound that handles transmission fluid and temperature swings without breaking down
Direct replacement for the factory O ring—no modifications needed
Quality construction that maintains its seal even when your tractor’s bouncing through rough fields
Proper size specification for 300 series gearbox applications

Built for Real Farm Work

The Massey Ferguson 300 series tractors were among the most successful agricultural machines of the 1980s and 1990s, dominating European farms with their exceptional power-to-weight ratio and reliability. These versatile tractors excelled in diverse farming operations including grain production, dairy farming, mixed agriculture, and specialty crop cultivation. The 362-375 models were perfect for medium-scale operations, while the powerful 390-399 series handled intensive cultivation, heavy plowing, and large-scale harvesting operations. Whether you’re using your 390 for loader work, running cultivators, or pulling heavy implements, this O ring keeps things sealed up where they need to be.

Made to Last

This O ring uses compounds specifically designed for transmission applications. It resists swelling from gear oil while staying flexible through heat cycles and cold morning starts. The material won’t get brittle or crack like cheaper seals that weren’t made for the job.

Good to Know

When you’re replacing this O ring, clean the groove thoroughly—old seal material or dirt will cause the new one to leak. A thin coat of gear oil on the O ring during installation helps it seat properly. If you’re already into the transmission, it’s smart to replace any other seals while you’ve got things apart since the labor is already done.