Yamaha - Gear - Lower Unit Component - 64P-45560-01-00

Overview

When a gear starts wearing out in the lower unit, you’ll usually hear it before anything else—grinding, whining, or just not feeling smooth. I’ve opened up plenty of units where one worn gear started taking out everything around it. This is one of those parts where strength and precision really matter. Keeping a solid gear in place helps your motor stay quiet, smooth, and dependable under load.

Key Features

• Reliable Power Transfer – Helps deliver engine power smoothly through the lower unit.
• Precision Machined Teeth – Designed for clean engagement and reduced internal wear.
• High-Strength Construction – Built to handle torque, load, and continuous operation.
• Direct Fit Design – Matches Yamaha specifications for proper alignment and installation.
• Supports Smooth Operation – Helps maintain quiet and consistent drivetrain performance.

Engine & Boat Compatibility

• Designed for Yamaha outboard engines with gear-driven lower units
• Compatible with a range of small to mid-range horsepower models
• Suitable for both freshwater and saltwater applications
• Commonly used in lower unit repair and rebuilds

FAQ

Q: What are the signs of a worn gear in the lower unit?
A: Grinding noise, vibration, or rough shifting are common indicators.

Q: Can one bad gear affect the rest of the unit?
A: Yes, it can cause wear or damage to other gears and bearings if not replaced.

Q: What usually causes gear failure?
A: Low or contaminated gear oil, water intrusion, or impact with debris.

Q: Is this something I can repair myself?
A: Gear work is more advanced and usually best handled by someone with lower unit experience.

Q: Does saltwater use impact internal gears?
A: Indirectly—keeping seals in good shape and gear oil clean is key to preventing corrosion.