Yamaha - Gear 1 Assembly - Lower Unit Drive Gear - 61H-45560-00-00

Overview

When the forward gear starts wearing out on these mid-to-high horsepower Yamahas, it’s not subtle—you’ll feel slipping, hear grinding, or notice the boat just doesn’t pull like it should. This gear assembly is what keeps forward drive solid when you drop it in gear and push the throttle. It’s built to handle real torque and long hours on the water, especially on bigger two-stroke setups. Replacing it during a rebuild is one of those fixes that brings your lower unit back to running strong and smooth again.

Key Features

• Forward Drive Gear Assembly – Handles primary power transfer to the propeller during forward operation.

• 26-Tooth Gear Design – Engineered for proper meshing and load distribution within the gearcase.

• High Torque Durability – Built to withstand heavy loads common in larger Yamaha outboards.

• OEM Precision Fit – Designed to align correctly with mating gears for smooth, reliable operation.

Engine & Boat Compatibility

Compatible with select Yamaha outboard lower units, commonly used in 150 horsepower, 175 horsepower, 200 horsepower, and 225 horsepower models. Always confirm fitment using your engine model and service manual.

FAQ

Q: What are signs this gear assembly is failing?
A: Slipping in forward gear, grinding noises, or loss of power under load are the most common signs.

Q: Can a damaged forward gear affect reverse?
A: Indirectly, yes—metal debris or misalignment can impact other gears inside the lower unit.

Q: Is this something I can replace without a full teardown?
A: No, the lower unit has to be fully disassembled to access and replace this gear assembly.

Q: What usually causes this gear to wear out?
A: Low or contaminated gear oil, water intrusion, and heavy impacts are the main causes.

Q: Should I replace other components at the same time?
A: It’s highly recommended to inspect bearings, seals, and mating gears to avoid uneven wear.