2 Dometic Marine Steering 2.1 Hydraulic steering overview
Our manual hydraulic steering systems are simple and efficient. The basic system consists of four main components; 1) the helm pump, 2) the cylinder, 3) the hose or tubing required to connect the cylinder to the helm pump, and 4) genuine SeaStar steering fluid. These basic components are necessary in all applications. However, as the system variables increase (i.e.: multiple engines, rudders, steering stations, power assist and autopilots), additional components may be required.
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1. The helm unit The helm pump is an axial piston pump specifically designed for manual steering, it has a built-in lock valve to prevent the steering load from feeding back to the driver. The lock valve will not allow the rudder or drive unit to move until you move it with the steering wheel. The lock valve section of the helm also includes a relief valve. This relief valve provides over-pressure protection for mechanical components, hydraulic hoses and fittings. 2. The cylinder The most important differences between the variety of steering systems available is the cylinder selection. Both BayStar and SeaStar systems have a cylinder for most steering applications. 3. Hoses and tubes — important Required to provide a path for the fluid to flow under pressure from the helm pump to the cylinder. SeaStar hoses are a custom multi-layered composite design, engineered specifically for our systems. They are designed to exceed SAE and ABYC specifications and provide precise steering control not achievable with hydraulic industry standard hoses. Due to performance and safety concerns, SeaStar recommends that only SeaStar or SeaStar PRO hoses be used in SeaStar steering systems.
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