Seastar Hydraulic Steering is a marine steering system that uses a helm pump, hydraulic hoses, and a steering cylinder to transfer steering input smoothly to an outboard or inboard engine. Designed for boating safety and critical control, it supports front or rear mount configurations, tilt helms, and pro-level setups, delivering reliable, sealed hydraulic performance for a wide range of boats operating at sea.
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1-2 weeks delivery time The SeaStar HC4648-3 cylinder fits Johnson outboards (1977-1990) and Yamaha outboards (2000 and later) in specified horsepower ranges. It offers dependable hydraulic steering with 7.3 cubic inches displacement and must be used with BayStar components.
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$ 593.23
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1-2 weeks delivery time The SeaStar HC4658-3 cylinder supports various outboards including Johnson/Evinrude, Suzuki, and Yamaha models within specific horsepower and year ranges. It ensures reliable hydraulic steering with 7.3 cubic inches displacement and exclusive BayStar component use.
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$ 593.23
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1-2 weeks delivery time The SeaStar HC5303-3 hydraulic cylinder is made for inboard steering systems, featuring a compact 3" stroke and 3.1 cubic inches volume. It has an aluminum body with ORB fittings, designed for precise control in marine hydraulic applications.
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$ 837.29
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1-2 weeks delivery time The SeaStar HC5312-3 hydraulic steering cylinder is made from marine-grade aluminum and provides smooth two-axis movement with easy autopilot integration. It is designed for single or dual rudder boats, offering 58kgm rudder torque and meeting industry standards.
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$ 679.43
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1-2 weeks delivery time The SeaStar HC5313-3 hydraulic steering cylinder delivers reliable performance for pleasure and work boats up to 50 feet, featuring marine-grade aluminum construction, easy installation, and compliance with safety standards, providing 66kgm rudder torque.
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$ 752.49
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1-2 weeks delivery time The SeaStar HC5314-3 hydraulic steering cylinder offers a robust solution with two-axis articulation, marine-grade aluminum body, and updated fittings. It provides smooth operation and 82kgm rudder torque for single or dual rudder boats, replacing earlier models with improved features.
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$ 774.49
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1-2 weeks delivery time The SeaStar HC5319-3 hydraulic steering cylinder is designed for boats up to 50 feet, featuring aluminum construction, upgraded fittings, and enhanced seals. It offers smooth steering with a 7" stroke and 110kgm rudder torque, compatible with several previous Capilano models.
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$ 1,572.85
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1-2 weeks delivery time The SeaStar HC5326-3 hydraulic cylinder suits sterndrive systems on Mercruiser and OMC Cobra engines from 1984 onward. It offers a 1.5" bore, 0.625" shaft, 7" stroke, 10.2 cubic inches displacement, and supports easy installation with autopilot interfaces.
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$ 897.92
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1-2 weeks delivery time The SeaStar HC5328-3 sterndrive cylinder is made from anodized aluminum for corrosion resistance and fits most stern drive boats, both power and non-power assist. It includes ORB fittings, weighs 5.5 lbs, and has an 8" stroke with 8.5 cubic inches volume, backed by a 2-year limited warranty.
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$ 868.65
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1-2 weeks delivery time The SeaStar HC5329-3 cylinder fits a wide range of sterndrives, including power and non-power assisted models, for single and multiple drive applications. It is compatible with most diesel engines to date and designed for versatility in marine steering systems.
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$ 946.31
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1-2 weeks delivery time The SeaStar HC5330-3 sterndrive cylinder fits Mercruiser and BMW engines without power assist. It offers balanced steering, easy installation, and autopilot compatibility. Installation requires a torque tab if none is present on the outdrive to manage prop torque effectively.
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$ 965.42
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1-2 weeks delivery time The SeaStar HC5331-3 hydraulic cylinder is designed for power-assisted Volvo sterndrives, providing smooth and responsive steering. It features an unbalanced system with differing lock-to-lock turns and updated ORB fittings for easy installation, compatible with SeaStar helm pumps.
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$ 967.08
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1-2 weeks delivery time The SeaStar HC5332 cylinder sterndrive works with Mercruiser and Volvo SX models lacking power-assisted steering. It delivers reliable hydraulic steering for non-power assisted marine applications, designed for simplicity and durability.
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$ 1,318.24
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1-2 weeks delivery time The SeaStar HC5345-3 Front Mount Hydraulic Outboard Steering Cylinder supports up to 700 HP, ideal for multi-engine setups. Its corrosion-resistant design and upgraded sealing system provide smooth, responsive steering in harsh marine conditions.
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$ 1,064.54
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1-2 weeks delivery time The Seastar HC5347-3 outboard cylinder front mount is designed for Honda engines, offering reliable performance, an 8.34 cubic inch volume capacity, and compatibility with 115-130HP Honda models.
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$ 1,064.54
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1-2 weeks delivery time The SeaStar HC5348-3 Outboard Cylinder Front Mounting is engineered for Yamaha outboards and features independent engine tilt for multi-engine setups. It also boasts a sealing system resistant to harsh outboard conditions and offers improved steering performance.
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$ 1,064.54
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1-2 weeks delivery time The SeaStar HC5351 Capilano hydraulic steering cylinder is built for durability and smooth operation with heavy-duty brass and bronze materials, compatible with Capilano helm pumps and Hynautic 3 Line systems. It offers two-axis articulation and includes bleed fittings for reliable inboard steering.
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$ 2,422.06
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1-2 weeks delivery time The SeaStar HC5357 Capilano hydraulic cylinder is a heavy-duty brass marine cylinder with single-axis articulation, designed for easy installation and reliable performance without air leaks or pressure drops in hydraulic steering systems.
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$ 2,305.94
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1-2 weeks delivery time The SeaStar HC5358-3 is a front mount hydraulic cylinder designed for 225HP four-stroke Yamaha outboard engines. It offers smooth steering, increased durability, and is compatible with all SeaStar hydraulic helm pumps.
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$ 1,064.54
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1-2 weeks delivery time The SeaStar HC5370-3 Side Mount Hydraulic Steering Cylinder is designed for single and dual-engine setups, especially for fishing boats and center consoles. It provides reliable power steering and is perfect for shallow splashwell installations.
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$ 668.32
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How does a Seastar Hydraulic Steering system transmit steering input to a boat’s engine?
A hydraulic steering system transmits steering input through a steering kit where helm rotation pressurizes fluid that flows via a valve to the steering cylinder. In front mount or pro rear mount configurations, the cylinder converts this pressure into smooth engine movement, while seals and a seal kit ensure reliability according to system spec, supporting classic tilt, flush, and sport tilt helm designs.
How does a hydraulic cylinder translate steering input into engine movement on a boat?
A hydraulic cylinder translates steering input into engine movement by using pressurized fluid to push or pull the cylinder rod in response to helm rotation. Matched to the system ratio such as 1.7, this product delivers smooth, proportional force that turns the engine accurately, ensuring controlled and predictable steering on a boat.
How does a steering kit integrate the pump, hoses, and valve into one system?
A steering kit integrates the pump, hoses, and valve by forming a closed hydraulic loop that transfers steering input smoothly from the helm to the engine. Designed for pro front mount and sport configurations, the system ensures balanced fluid flow and precise response at sea, supporting advanced solutions such as optimus e-actuator concepts and sport plus performance standards demonstrated in technical video documentation.