What is the role of the follow-up gear in an electro-hydraulic steering gear?

The role of the follow-up gear in an electro-hydraulic steering gear is to take the pump off stroke when the desired rudder angle is attained. This is crucial because once the rudder has reached the desired position, the follow-up gear ensures that the hydraulic pump stops supplying additional fluid to the system, thus preventing oversteering and maintaining the set rudder angle. This mechanism enhances the efficiency and safety of the steering system by allowing the steering to automatically adjust without requiring constant hydraulic pressure once the desired result is achieved.

By design, this follow-up system works to match the pump's output with the current demand based on the rudder's position, effectively automating the process of steering control and ensuring that the vessel maintains its course without excessive input from the steering controls.