Yamaha - Gear - Lower Unit Gear Train Component - 6E7-45560-01-00

Overview

Gears inside the lower unit take a beating, especially if the motor’s been run hard or seen a few impacts. I’ve opened up cases where one worn gear started a chain reaction of noise and vibration. This gear is part of what keeps power moving clean from the engine down to the prop. When it’s in good shape, everything runs smooth and quiet like it should.

Key Features

• Precision Gear Tooth Design – Ensures smooth engagement with mating gears for reliable operation.
• Consistent Power Transfer – Helps deliver steady torque through the lower unit.
• Hardened Metal Construction – Built to handle load, friction, and continuous marine use.
• Reduced Wear Performance – Designed for clean meshing to minimize stress on surrounding components.
• Exact Yamaha Fitment – Matches factory specifications for proper alignment and installation.

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 reliable propulsion and durability are essential.

FAQ

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

Q: Should I replace other gears at the same time?
A: It’s a good idea 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 cause corrosion, so maintaining seals is key.

Q: Can a worn gear damage the lower unit?
A: Yes, it can lead to additional internal damage if not addressed early.