6.1.1 How the system works
SeaStar P/A (Power Assist) steering uses an electronically controlled on-demand hydraulic pump to provide “Power” for your SeaStar hydraulic steering system. The SeaStar P/A system is comprised of two circuits: a hand operated manual system, which is the control element, and a hydraulic power pump, which is the working element. The manual system consists of a helm pump with internal relief and check valves, as well as a built in reservoir. Two steering lines and a compensating line which provide a routing for fluid to transmit through the system, and a steering cylinder which moves the steering device on the boat from side to side. The power system, is an electronically controlled hydraulic pump that boosts the fluid being sent from the helm pump to the steering cylinder (this will result in much easier effort at the wheel—even when under heavy loads). A compensating line connects the P/A unit to the helm pump, allowing the P/A unit to share fluid with the helm reservoir. The SeaStar P/A is compatible with multiple steering stations, and with the use of an autopilot. In the event of a P/A power loss or failure the hydraulic system will automatically revert to a manual hydraulic system.
HELM PUMP
HELM PUMP
STEERING LINES
STEERING LINES
COMPENSATING LINE
COMPENSATING LINE
H1
H2
H1
H2
POWER ASSIST UNIT
POWER ASSIST UNIT
C1
C2
C1
C2
SEASTAR OUTBOARD CYLINDER
TILLER ARM
SEASTAR INBOARD CYLINDER
Figure 6-2. Typical installations shown. Please refer to your cylinder installation manual for proper hose installation diagrams.
6-2
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