Komatsu OEM Main Shaft Gear – Model 120-14-32112 for D40A Bulldozer

Upgrade your Komatsu D40A-3 and D40A-5 transmission with the genuine OEM Main Shaft Gear (Part No. 120-14-32112). Expertly engineered to original factory specifications, this hardened steel gear boasts 22 precision-machined teeth for smooth power transfer, reduced backlash, and exceptional durability under heavy loads. Trusted by maintenance professionals worldwide, it comes ready to install—minimizing downtime with perfect fitment and reliability. Backed by Komatsu’s rigorous quality standards, this gear ensures long service life in the harshest construction environments.

Key Features:

• 100% genuine Komatsu OEM steel gear

• Precisely cut 22-tooth design for optimal engagement

• Direct replacement for D40A-3 (S/N 6001+) and D40A-5 (S/N 10001+) models

• Factory-specified weight: 1.37 kg

• Proven performance in heavy-duty bulldozer transmissions