The Drive unit is the part that interfaces with your vessel’s steering system to keep you on the right course. Raymarine has a broad range of drive units to match almost any type of steering system – our Evolution Autopilots accommodate hydraulic, mechanical and power assisted stern drive systems.
Hydraulic Steering System
Raymarine Evolution pilots connect to hydraulic steering systems using a rugged hydraulic pump matched to the capacity of the hydraulic steering system.
If your system is hydraulic…
You’ll need to find out the size (in cc) of the hydraulic cylinder ram(s) mounted to the rudder or inboard engined boats, or to the drive unit on outboard engined boats.
If you cannot find the ram size on your steering system documentation, you can look on the cylinder ram itself for the brand and model number.
• In some systems with dual steering rams in parallel, cylinder capacity is the total of both rams. Rams in series only require single capacity valve. Hydraulic steering systems with steering rams over 500cc require our larger constant running pump used in conjunction with the relevant ACU.