Yamaha Gear 1 Assy - Lower Unit Gear Component - 679-45560-00-00

Overview

When you’re dealing with power transfer issues in the lower unit, gears like this are usually where the problem shows up. This assembly plays a key role in transferring engine power down to the prop, and if it’s worn, you’ll feel it in performance or hear it under load. I’ve seen gears like this cause noise, slipping, or loss of efficiency when they start to go. When everything’s in good shape, power transfers clean and the boat runs strong.

Key Features

• Power Transfer Function – Transfers engine power through the lower unit to drive the propeller.
• Genuine Yamaha Fitment – Designed to match factory gearcase specifications precisely.
• Smooth Gear Engagement – Helps reduce noise and ensures efficient operation under load.
• High Strength Construction – Built to handle torque and continuous use in marine conditions.
• Precision Machined Design – Ensures proper alignment and long-term reliability.

Engine & Boat Compatibility

Compatible with select Yamaha outboards using this gear assembly. Verify fitment based on your specific engine model.

FAQ

Q: What are signs of a worn gear assembly?
A: Grinding noises, loss of power, or unusual vibration under load.

Q: Can this affect boat performance?
A: Yes, it directly impacts how efficiently power is transferred to the propeller.

Q: Is this part inside the lower unit?
A: Yes, it’s part of the internal gearcase system.

Q: Is replacement difficult?
A: It can be more involved and usually requires lower unit disassembly.

Q: Does regular maintenance help extend its life?
A: Yes, proper lubrication and gear oil changes are key.