Yamaha - Gear - Lower Unit Drivetrain - 60X-45560-00-00

Overview

When you’re inside a Yamaha lower unit, the gears are where everything either works perfectly—or doesn’t. This piece plays a direct role in how smoothly power gets transferred from the engine to the prop. Worn or chipped gears don’t just make noise, they lead to bigger failures if ignored. If you’re already tearing into a gearcase, it’s worth doing it right the first time.

Key Features

• Precision-Cut Gear Teeth – Designed to mesh cleanly for smooth, consistent power transfer.
• Hardened Steel Construction – Built to handle high torque and constant load without premature wear.
• OEM Fit and Alignment – Matches factory tolerances to ensure proper gear engagement.
• High Load Capacity – Engineered to perform under demanding acceleration and cruising conditions.

Engine & Boat Compatibility

Yamaha F150 – 2004–2012
Yamaha LF150 – 2004–2012

FAQ

Q: What are signs this gear is going bad?
A: You’ll usually hear whining, grinding, or feel vibration, especially when shifting or under load.

Q: Can I replace just one gear or should I do more?
A: It depends on wear, but most techs inspect all mating gears since they wear together.

Q: What causes gear failure in the lower unit?
A: Low or contaminated gear oil, water intrusion, or hard shifting are the most common causes.

Q: Any tips during installation?
A: Check gear patterns and make sure everything is properly shimmed—alignment is critical here.

Q: Does saltwater affect internal gears?
A: Not directly if seals are good, but once water gets in, corrosion can damage gears quickly.