This product has been superseded by: 6GD-G5560-01-00

Yamaha - Lower Unit Gear - Drivetrain Component - 646-45560-00-00

Overview

When you’re dealing with lower unit issues, worn or damaged gears are usually at the center of it. This Yamaha gear is built to handle the load of transferring engine power down to the prop, and when it starts to wear, you’ll hear it and feel it. Grinding, slipping, or inconsistent performance are all signs something isn’t right. Replacing it helps bring the drivetrain back to smooth, reliable operation.

Key Features

• Power Transmission Gear – Transfers engine power efficiently through the lower unit.

• Smooth Gear Engagement – Helps maintain consistent shifting and operation.

• OEM Yamaha Fitment – Built to factory specifications for proper alignment and durability.

• Hardened Gear Construction – Designed to withstand load, wear, and long-term use.

Engine & Boat Compatibility

• Compatible with select Yamaha outboards that utilize this lower unit gear (confirm fitment by model and year)

FAQ

Q: What are signs of a worn gear?
A: Grinding noise, slipping, or rough operation in gear are common indicators.

Q: Can a damaged gear affect performance?
A: Yes, it can lead to poor power transfer and possible further damage inside the lower unit.

Q: Should I replace other components at the same time?
A: It’s a good idea to inspect bearings and seals when servicing gears.

Q: Is this a high-wear component?
A: It can be, especially under heavy use or if gear oil maintenance is neglected.

• Supersessions
  6GD-G5560-00-00, 6GD-G5560-01-00, 6GD-G5560-01-00