Yamaha - Gear - Lower Unit Gear Train - 6EM-45560-00-00

Overview

When you’re inside a lower unit, gears are where everything either works right—or doesn’t. I’ve seen worn gears turn a smooth-running motor into something noisy and unpredictable in no time. This is one of those parts that takes constant load every time you’re on the throttle. When it’s in good shape, power transfers clean and quiet, just like you expect from a Yamaha.

Key Features

• Precision-Cut Gear Teeth – Ensures proper meshing with other gears for smooth operation.
• Consistent Power Transfer – Helps deliver steady torque through the lower unit.
• Hardened Metal Construction – Built to withstand load, friction, and long-term use.
• Reduced Gear Wear – Designed for clean engagement to minimize internal stress.
• Exact Yamaha Fitment – Matches factory specifications for proper alignment and function.

Engine & Boat Compatibility

Designed for Yamaha outboard lower units utilizing internal gear train systems. Commonly used across mid to high horsepower Yamaha outboards in recreational and commercial boats. Suitable for freshwater and saltwater environments where dependable propulsion and durability are essential.

FAQ

Q: What are signs this gear is worn or failing?
A: Grinding noise, vibration, or metal particles in the gear oil are common warning signs.

Q: Should I replace other components when changing this gear?
A: It’s a good idea to inspect bearings, seals, and other gears since wear often spreads through the system.

Q: Any tips for installing this gear?
A: Make sure everything is properly aligned and lubricated during assembly, and follow correct torque specs.

Q: How does saltwater affect internal gears?
A: Water intrusion can cause corrosion, so keeping seals in good condition is critical.

Q: Can a damaged gear lead to bigger problems?
A: Yes, it can quickly damage other internal components if not addressed early.