Yamaha - Gear 1 (28 Tooth) - Lower Unit Gear Train - 6EH-45560-00-00

Overview

When you’re dealing with lower unit gears, even small wear shows up fast on the water. I’ve opened up gearcases where one worn gear turned into noise, vibration, and eventually bigger damage. This gear is part of that chain that keeps power moving clean from the engine to the prop. When it’s in good shape, everything runs quiet and smooth like you expect from a Yamaha.

Key Features

• 28 Tooth Gear Design – Precisely cut teeth ensure proper engagement within the gear train.
• Smooth Power Transfer – Helps deliver consistent torque through the lower unit.
• Hardened Metal Construction – Built to handle load, friction, and long-term marine use.
• Reliable Gear Engagement – Supports clean meshing to reduce wear on surrounding components.
• Exact Yamaha Fitment – Designed to match factory specifications for proper alignment and function.

Engine & Boat Compatibility

Designed for Yamaha outboard lower units utilizing internal gear train systems. Commonly used across a range of Yamaha outboards in recreational and commercial marine applications. Suitable for freshwater and saltwater environments where dependable propulsion and durability are essential.

FAQ

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

Q: Should I replace other gears at the same time?
A: It’s recommended to inspect all related gears since wear often affects multiple components.

Q: Any tips for installing this gear?
A: Proper alignment and lubrication during assembly are critical to avoid premature wear.

Q: How does saltwater affect internal gears?
A: Water intrusion can lead to corrosion, so maintaining seals is key.

Q: Can a worn gear damage the lower unit?
A: Yes, it can cause additional wear and failure in other internal components if not addressed.