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SeaStar Hydraulic Power Steering (Cont.)

1. Vessel size and hull type determine the kind of cylinder required. (All boats over 70 feet in length should have
steering loads reviewed by SeaStar Solutions.)
2. Engine type determines which power steering pump should be used. If in doubt, contact SeaStar Solutions.
3. A SeaStar 1.7 helm is recommended; this will result in a system with 3-1/2 wheel turns lock-to-lock when 9” stroke
cylinders are used. If a different number of wheel turns is desired, contact SeaStar Solutions for recommended
helm to achieve desired number of steering wheel turns.
SeaStar hydraulic power steering uses the ship’s engine(s) to provide the “power” for the steering system, via a
mechanically or electric motor driven hydraulic pump.
A manual hydraulic steering system, consisting of a standard SeaStar helm and a hydraulic steering cylinder (fitted
with an integral servo cylinder and a power steering valve), supplies the “control” portion of the steering system.
Under normal conditions, with engines running, a hydraulic oil supply is in a stand-by mode, ready to be directed
to the steering cylinder as dictated by the steering wheel, servo cylinder and power steering valve.
Turning the steering wheel left or right makes the system go from “stand-by” into “operating” mode and move
the steering cylinder accordingly.
In the event of a power source failure, hydraulic oil from the steering helm is automatically diverted into the servo
and steering cylinder, providing the helmsman with manual back-up steering.
An engine room mounted oil reservoir allows easy fill and assists the in-line cooler in cooling the hydraulic oil.
An in-line oil filter helps to protect the steering system components against contaminants.
STEERING - Inboard (Hydraulic)