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Boats with traditional hydraulic steering systems will use an Evolution autopilot driven by a hydraulic pump. The pump connects to the boat"s hydraulic steering lines and allow the autopilot to steer the boat by controlling the flow of fluid through the boat"s steering system. The hydraulic pump is controlled by the Evolution autopilot Actuator Control Unit (ACU.)

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Raymarine Evolution pilots connect to hydraulic steering systems using a rugged hydraulic pump matched to the capacity of the hydraulic steering system.

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. Your steering system documentation will have this information.

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. Once you have the number use our hydraulic cylinder ram cross-reference guide to determine which hydraulic autopilot pump is compatible with your vessel"s hydraulic steering system.

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 - contact Raymarine for details.

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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. Your steering system documentation will have this information.

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 Raymarine"s larger constant running pump used in conjunction with SPX and SPX-SOL course computers.

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DescriptionEvolution pilots connect to hydrualic steering systems using a rugged hydraulic pump matched to the capacity of the hydraulic steering system. You will need to find out the size (in cc) of the hydraulic cylinder(s) mounted to the rudder or inboard engine boats.