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Raymarine SmartPilot Drives

Selecting a Hydraulic Drive

Raymarine SmartPilots interface to hydraulic steering systems using a rugged hydraulic pump that is matched to the capacity of your vessel's hydraulic steering system. To match a Raymarine hydraulic pump to your vessel you need to learn the size (in cubic inches) of the actual hydraulic cylinder ram or rams that are mounted to the rudder on inboard engine boats or the ram mounted to the drive on outboard engine boats. Your steering system documentation will have this information.

Alternatively you can look on the actual cylinder ram itself for the brand and model number. Once you have learned the model number of your cylinder ram(s) consult our Hydraulic Cylinder Ram Cross-Reference table to learn which hydraulic autopilot pump is compatible with your hydraulic steering system.

Raymarine autopilot hydraulic pumps are available in several sizes to accommodate a broad range of steering cylinder capacities. The table below illustrates the capacity of each type of Raymarine hydraulic autopilot pump when used with the corresponding SmartPilot corepack.

  • Vessels with outboard engines require an optional Linear Rudder feedback (Model number M81188)
  • Hydraulic steering systems with steering rams over 30.5 cubic inches require our larger constant running hydraulic pumps used in conjunction with or S3 or S3G corepacks.
  • Vessels with 24-volt DC power must use the S3 or S3G corepack and 24-volt drive.
  • An Authorized Raymarine Dealer is best suited for installing a hydraulic autopilot system.

SmartPilot Hydraulic Drive Selection Chart

Drive Type

Type 1

Type 1

Type 2

Type 3

Vessel Displacement

Does not apply here. The drive unit is matched to the ram capacity of the steering system

Ram Capacity

4.9in3 - 10.5in3

4.9in3 - 14in3

14in3 - 21in3

21in3 - 30.5in3

(80cc - 172cc)

(80cc - 230cc)

(230cc - 350cc)

(350cc - 500cc)

Maximum Stall Pressure at 12V

750psi (50bar)

750psi (50bar)

1450psi (100bar)

1160psi (80bar)

Peak Flow Rate (no load)

67in3/min (1000cc/min)

67in3/min (1000cc/min)

122in3/min (2000cc/min)

175in3/min (2900cc/min)

Corepack Used

S1 or S1G

S2 or S2G

S3 or S3G

S3 or S3G

Drive Details

M81120 (12 V)

M81120 (12 V)

M81121 (12 V)

M81122 (12 V)

M81119 (24 V)

M81123 (24 V)

M81124 (24 V)

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