RAYMARINE M81203 HYDRAULIC LINEAR DRIVE TYPE 3 - 24V Hydraulic Linear Drive Type 3 - 24V The hydraulic linear drive system is designed for boats with existing mechanical steering systems, not hydraulic steering systems.
It provides a totally isolated autopilot steering system consistingof: Hydraulic ram: a self-contained autopilot steeringcylinder with a load limiting system and a built in clutch (to allow friction-free steering when the autopilot is not in use).
Reversing hydraulic pump: powers the hydraulic ram.
Hydraulic fluid reservoir: supplies hydraulic fluid to the system.