Yamaha - Gear 1 (28T) - Lower Unit Component - 64P-45560-10-00

Overview

When you’re inside a lower unit, gears like this are doing the heavy lifting every time you hit the throttle. A worn or chipped gear will usually let you know—noise, vibration, or just not feeling right under load. I’ve seen one bad gear start a chain reaction that takes out other components if it’s not handled early. Keeping a strong, properly matched gear in place keeps everything running smooth and reliable.

Key Features

• 28-Tooth Gear Design – Provides precise engagement for proper drivetrain operation.
• Smooth Power Transfer – Helps deliver consistent engine power through the lower unit.
• Precision Machined Teeth – Designed for clean contact and reduced wear over time.
• High-Strength Construction – Built to handle torque, load, and continuous use.
• Direct Fit Replacement – Matches Yamaha specifications for proper alignment and installation.

Engine & Boat Compatibility

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

FAQ

Q: What does the 28T mean on this gear?
A: It refers to the number of teeth, which affects how the gear meshes and transfers power.

Q: What are the signs this gear is worn or damaged?
A: Grinding noise, vibration, or rough operation are common indicators.

Q: Should I replace other gears at the same time?
A: It’s a good idea to inspect the full gear set and replace any worn components together.

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

Q: Is this a difficult repair?
A: Gear replacement requires lower unit disassembly, so it’s best for experienced mechanics.