Yamaha - Gear - Lower Unit Drivetrain Component - 68U-45560-00-00

Overview

This is one of those internal pieces you don’t think about until something feels off in the drive. The gear plays a direct role in transferring power from the engine down through the lower unit, and when it’s right, everything just runs smooth and quiet. When it’s worn, you’ll hear it before you see it—grinding, hesitation, or rough engagement. This is the kind of part you trust to hold up under long runs and heavy throttle without second-guessing it.

Key Features

• Precision-Cut Gear Teeth – Designed for smooth engagement and consistent power transfer through the lower unit.
• Hardened Steel Construction – Built to handle repeated load stress and resist premature wear.
• Direct OEM Fitment – Matches factory specifications for proper alignment and operation.
• Balanced Rotation Performance – Helps reduce vibration and noise during acceleration and cruising.

Engine & Boat Compatibility

Yamaha Outboard Models – Varies by application (confirm by part number)

FAQ

Q: What are the signs this gear might be worn or failing?
A: You’ll usually notice grinding noises, slipping during acceleration, or a rough feel when shifting into gear.

Q: Can I replace just this gear or do I need to rebuild the whole lower unit?
A: It depends on the wear. If other components show damage or metal contamination, a full inspection or rebuild is recommended.

Q: Is this something I can install myself?
A: It’s possible if you’re experienced with lower unit work, but proper shimming and alignment are critical.

Q: How does saltwater use affect this part?
A: Saltwater can accelerate wear if seals fail or maintenance is skipped, but the gear itself is built to handle marine conditions.

Q: Should I replace bearings when installing a new gear?
A: It’s a smart move. Fresh bearings help ensure proper alignment and extend the life of the new gear.