Raymarine Drive Unit Selection


Raymarine Evolution systems accommodate hydraulic, mechanical and power assisted stern drive systems. If you are not sure how to determine what type of steering system is installed on your vessel, please consult an authorised Raymarine dealer.


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. 


Select your steering type below to explore available drive units... 



Raymarine Hydraulic Steering Systems


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. Your steering system documentation will have this information.





Autopilot Tip 


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.





0.5ltr pump 
Raymarine Type 1 Hydraulic Pump 
Raymarine Type 2 Hydraulic Pump 
Raymarine Type 3 Hydraulic Pump 
CR Pump  
Drive Type 

Type 0.5 (12V)

12V: E12139 

Type 1 (12V or 24V)

12V: M81120 
24V: M81119 

Type 2 (12V or 24V)

12V: M81121 
24V: M81123 

Type 3 (12V or 24V)

12V: M81122 
24V: M81124 

Constant Running Pump 
(12V or 24V)

12V: E12171 
24V: E12172 

Vessel Displacement 

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

Ram Capacity  


80cc – 230cc

  230cc – 350cc


  350cc – 500cc


500cc - 1200cc
(30.5in3 - 73in3)

Maximum Stall Pressure at 12V  







57 bar


Peak Flow Rate (No Load) 


(274.6in3 / min)

 ACU Used  







  • 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.
  • An authorised Raymarine dealer is best suited to installing a hydraulic autopilot system.
  • Type 0.5 suitable for Volvo D4/D6 Sterndrive applications.





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