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.

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)

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.

Reversing hydraulic pump for use with steering systems equipped with 4.9–14 cubic inch (80cc – 230cc) hydraulic steering rams.

Reversing hydraulic pump for use with steering systems equipped with 4.9–14 cubic inch (80cc – 230cc) hydraulic steering rams. Compatible with 400 Series corepacks.

Reversing hydraulic pump for use with steering systems equipped with 9.8–21 cubic inch (160-350cc) hydraulic steering rams. Compatible with 400 Series corepacks.

Reversing hydraulic pump for use with steering systems equipped with 9.8–21 cubic inch (160-350cc) hydraulic steering rams. Compatible with 400 Series corepacks.

Reversing hydraulic pump for use with steering systems equipped with 21-30.5 cubic inch (350-500 cc)hydraulic steering rams. Compatible with 400 Series corepacks.

Reversing hydraulic pump for use with steering systems equipped with 21-30.5 cubic inch (350-500 cc)hydraulic steering rams. Compatible with 400 Series corepacks.