Yamaha - Gear - Lower Unit Component - 689-45560-10-00

Overview

The gear is a critical internal component of your Yamaha outboard’s lower unit, responsible for transmitting engine power through the gearcase to the propeller. Precision-engineered for smooth engagement, this gear plays a key role in forward propulsion and overall drivetrain efficiency. It works in coordination with other internal gears to ensure reliable shifting and consistent performance on the water. If worn or damaged, it can cause grinding, slipping, or reduced performance. Replacing it helps restore smooth operation and dependable power transfer.

Key Features

• Power Transfer Function – Transmits engine power through the lower unit to the propeller.
• Precision Gear Design – Ensures smooth engagement and efficient operation.
• OEM Yamaha Construction – Built to factory specifications for durability and exact fit.
• Lower Unit Integration – Designed for proper function within the gearcase assembly.

Engine & Boat Compatibility

Compatible with Yamaha outboards using this component within the lower unit / gearcase assembly (commonly found in mid-range outboards).

FAQ

Q: What does this gear do?
A: It transfers rotational power within the lower unit to drive the propeller.

Q: What are signs this gear is worn or damaged?
A: Grinding noise, vibration, slipping, or difficulty shifting.

Q: Is this part inside the lower unit?
A: Yes, it is an internal gear within the gearcase.

Q: Is this a high-wear component?
A: It can wear over time, especially with poor lubrication or water contamination.

Q: Is installation difficult?
A: Yes, it requires disassembly of the lower unit and is typically handled by experienced technicians.

• Supersessions
  689-45560-00-00