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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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The Raymarine (M81122) Type 3 Hydraulic Pump 12V (Use w/ACU-400) connects your Raymarine Evolution Autopilot system to your hydraulic steering system. To determine the right unit for your vessel, you need to know the size in cc of the hydraulic cylinder rams mounted to the rudder on inboard engine boats or the drive unit on outboard engine boats. Check your steering system documentation to be sure.

The Raymarine (M81122) Type 3 Hydraulic Pump 12V (Use w/ACU-400) connects your Raymarine Evolution Autopilot system to your hydraulic steering system. To determine the right unit for your vessel, you need to know the size in cc of the hydraulic cylinder rams mounted to the rudder on inboard engine boats or the drive unit on outboard engine boats. Check your steering system documentation to be sure.

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The Type 1 hydraulic drive is compatible with both S1/S1G and S2/S2G corepacks. Use the table below to determine the Type 1 hydraulic drive"s capacity when used with each corepack

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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 consisting of:

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).

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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 Raymarine"s hydraulic cylinder ram cross-reference guide to determine which hydraulic autopilot pump is compatible with your vessel"s hydraulic steering system.

Notes: 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 the relevant ACU - follow ACU link below for details.