Yamaha - Gear 2 Assembly - Lower Unit Drivetrain - 6E0-45570-00-00

Overview

When you start hearing noise or feeling vibration from the lower unit, gears are usually at the center of it. This assembly handles a lot of load every time you’re on the throttle, and once wear sets in, it only gets worse. I’ve torn down units where one worn gear ended up affecting everything around it. Replacing it with a proper assembly brings things back to smooth, dependable operation.

Key Features

• Integrated Gear Assembly – Designed as a complete unit for proper meshing and alignment.
• High Load Durability – Built to handle constant torque and drivetrain stress.
• Smooth Rotation Performance – Helps reduce vibration and maintain consistent power transfer.
• OEM Precision Fitment – Matches original specifications for reliable installation and function.

Engine & Boat Compatibility

Designed for Yamaha 2-stroke outboard engines with standard lower unit gearcases. Commonly used on smaller to mid-range horsepower motors found on skiffs, jon boats, and fishing boats.

FAQ

Q: What are signs this gear assembly is worn out?
A: Grinding noise, vibration, or metal in the gear oil are common indicators.

Q: Can I replace just this gear without checking others?
A: It’s best to inspect all gears since wear often affects multiple components.

Q: What causes lower unit gear failure?
A: Low or contaminated gear oil, water intrusion, or impact damage are the main causes.

Q: Is this a difficult repair to handle myself?
A: It’s more advanced and requires proper tools and setup for correct alignment.

Q: How can I prevent gear damage in the future?
A: Regular gear oil checks and avoiding impacts with underwater objects go a long way.