REVERSE GEAR PIN 689-45570-00

Function and technical context

The reverse gear is a critical gear in the transmission system that allows the rotation of the propeller shaft to be reversed, allowing the boat to move backwards. This component works integrated into the marine gearbox, engaging with the forward pinion to provide two essential navigation directions in docking, mooring and navigation maneuvers in confined spaces. Wear or breakage of the reverse gear seriously compromises the maneuverability of the boat and can completely prevent reverse operation, leaving the boat without the ability to control in critical situations.

When to replace this part?

Symptoms of wear include difficulty or refusal to engage reverse gear, abnormal metallic noises coming from the gearbox, irregular vibrations during reverse, or progressive loss of reverse thrust. Although marine sprockets are designed for long life, accelerated wear can occur from heavy use in repeated maneuvers or from insufficient lubrication. Replacing this part preventively during seasonal maintenance avoids unexpected navigation failures and costly emergency repairs at sea.

Equivalent manufacturer part numbers