Transmission Pinion Gear for Massey Ferguson 300, 4200 and 4300 Series Tractors

Description

When your 12-speed transmission starts grinding or won’t shift smoothly into certain gears, a worn pinion gear is often the culprit. This precision-machined 20-tooth pinion is what transfers power through your Massey Ferguson’s transmission, and when it wears down, you’ll feel it in every gear change. Don’t wait until you’re stuck in the field with a transmission that won’t cooperate—replacing worn pinion gears keeps your tractor shifting like it should.

What You’re Getting

• Precision 20-tooth design engineered to exact OEM specifications for smooth power transfer
• 95mm measurement across teeth ensures proper fit and mesh with other transmission components
• Heat-treated steel construction built to handle the constant stress of field work
• Compatible with both synchro shuttle and standard 12-speed transmissions
• Direct replacement part—no modifications or special tools needed

Built for Real Farm Work

This pinion fits the workhorse Massey Ferguson 300 series tractors like the 390, 398, 365, and 375, plus the larger 4200 and 4300 series models that handle heavy implements and long field days. Whether you’re running a compact utility tractor for livestock work or pushing a big planter with a 4300 series, this gear handles the power transfer that keeps you moving.

Made to Last

Transmission gears take tremendous loads, especially when you’re pulling heavy implements or working in tough conditions. This pinion is manufactured from quality steel with proper heat treatment to resist wear and tooth damage. The precise tooth geometry ensures smooth meshing and reduces the stress that causes premature failure in cheaper parts.

Good to Know

Replacing transmission pinions requires splitting the tractor, so it’s often worth doing multiple gears at once if you’re experiencing transmission problems. Check other gears and synchronizers while you’re in there—it saves labor later. Keep the transmission clean during assembly, and use the recommended oil grade for proper lubrication of all those moving parts.