The ONWA Solenoid Pump (Models 1012S and 1024S) is a specialized hydraulic drive unit designed specifically for autopilot systems. It is the go-to solution for vessels that rely on hydraulic hand steering (helm steering) but lack a motorized pump to drive the rudder automatically.

The Solenoid Pump acts as the “muscles” for your autopilot, converting electrical signals from the autopilot controller (like the ONWA KAP-866) into physical hydraulic pressure.

Unlike standard reversing pumps that change the motor’s direction to steer, a solenoid pump typically uses a continuously running motor combined with directional solenoid valves to divert oil flow. This design is often preferred for its rapid response and durability in commercial or heavy-duty steering applications.