Sea Star Steering: The Ultimate Steering System for High Performance Boats

If you’re an avid boater and crave the thrill of high-speed performance on the water, then the SeaStar HK7518A-3 PRO Hydraulic Steering System Kit is a must-have for your boat. Designed for high-torque single non-power-assisted outboard applications up to 350HP, this steering system is the go-to choice for high-performance bass boats.

Unleash the Power of SeaStar PRO

For over two decades, SeaStar PRO has been steering the BASS Masters Classic, solidifying its reputation as the top choice of high-performance outboard boat builders. This system is not only suitable for high-performance propellers but also works seamlessly with jack plates.

Features and Benefits

Let’s take a closer look at the features and benefits that make the SeaStar HK7518A-3 PRO Hydraulic Steering System Kit stand out from the competition:

  • Complete Kit: This kit includes everything you need for a hassle-free installation, including the helm pump, steering ram/cylinder, fittings, oil, bleeder kit, and detailed instructions.
  • Low Friction Hydraulic Steering: Say goodbye to steering fatigue with SeaStar PRO’s low friction hydraulic system, ensuring smooth and effortless steering even at high speeds.
  • Solid and Sure: The unique valve system of the PRO cylinders keeps pressure at both hydraulic lines equal, giving you a solid and sure feel at all times.
  • Enhanced Durability: The PRO cylinders are manufactured with longer shaft bushings and larger pivot bushings, providing an even more solid feel and improved durability.
  • Optimal Performance: The SeaStar HK7518A-3 PRO Hydraulic Steering System Kit comes with 18′ PRO Kevlar hoses, factory swaged and rated at 1500PSI. These hoses are reinforced with Kevlar for superior strength and performance.
  • Upgrade Options: Want to enhance your system’s resistance to salt water? You can choose to upgrade to stainless steel fittings, which are ideal for saltwater applications. This option is only available through Ambassadeur Hotel.


To provide you with a clearer picture, here are the specifications of the items included in the SeaStar HK7518A-3 PRO Hydraulic Steering System Kit:

  • HH5770-3 PRO 2.0 Front Mount Helm Pump:

    • Turns Lock to Lock: 4.25
    • Dash Cut Out Dia: 3″
    • Footprint Dimensions: 4.4375″
    • Shaft Size: 3/4″ Taper
  • HC6345-3 PRO Front Mount Outboard Cylinder:

    • Bore Dia: 1.375″
    • Nominal Shaft Dia: 0.75″
    • Displacement: 8.34in³/rev
  • HO5718 18′ PRO Kevlar Hoses:

    • PSI Rating: 1500
    • Length: 18′
    • Connections: SeaStar Factory Swage Fittings
  • HA5430H SeaStar Hydraulic Steering Fluid:

    • Quantity: 2 Quarts

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HH5770-3 PRO 2.0 Front Mount Helm Pump

Application Guide

Here is a quick reference guide to help you determine if the SeaStar HK7518A-3 PRO Hydraulic Steering System Kit is suitable for your boat:

  • Honda:

    • 1996-Date 150-300HP (HC6345-3 BF Engines)
    • 2001-Date BF200-BF250 (HC6345-3 Requires HA5472)
    • 2003-Date BF150 (HC6345-3 Requires HA5472)
  • Johnson/Evinrude:

    • 1977-1990, 2002-Date, 2003-Date, 2005-Date (150-300HP, 150-250HP 4 Stroke, 150-300HP Etech, E250HP Vindicator)
    • HC6345-3
  • Mercury:

    • 1989-Date 150-300 XS Engines (HC6345-3)
    • 1989-Date 150-300HP 2-Stroke & 4 Stroke (HC6345-3)
  • Suzuki:

    • 1986-Date 150-300HP 2-Stroke & 4 Stroke (HC6345-3)
  • Yamaha:

    • 1986-Date 150-350HP 2-Stroke & 4 Stroke (HC6345-3)

Helm Pump and Cylinder Dimensions

HC6345-3 PRO Front Mount Outboard Cylinder

How to Measure Hydraulic Steering Hoses

HA5430H SeaStar Hydraulic Steering Fluid

Enhance Your Steering Experience

Looking to upgrade your steering system even further? Check out these related items:

  • SeaStar PRO Tilt Helm Kit – Round Base (Sport)
  • SeaStar PRO Tilt Helm Kit – Square Base (Classic)
  • SeaStar PRO HK7514A-3 Kit with SeaStar PRO Power Assist – Drives perfect with no effort
  • SeaStar HA5419 20° Dash Wedge Kit

Downloads Section

For additional resources, feel free to access the following manuals:

  • Outboard Cylinder Installation Manual [PDF]
  • Front Mount Helm Pump Installation Manual [PDF]
  • SeaStar Catalog [PDF]

Your Ultimate Source for SeaStar PRO

At Ambassadeur Hotel, we take pride in being your go-to source for all things SeaStar. We offer expert customer service, built-to-order Seastar products, and stainless steel fittings that are exclusively available through us. Plus, for customers outside of California, enjoy the added benefit of no sales tax. We ship worldwide, so no matter where you are, we’ve got you covered.

Have any questions? Reach out to our tech support team for assistance or visit our stock inquiry page for more information. Need to request a custom hose length or single hoses? Simply request a quote, and we’ll be happy to assist you.

Experience the ultimate steering performance with the SeaStar HK7518A-3 PRO Hydraulic Steering System Kit. Upgrade your boat today and feel the difference on the water!

Ambassadeur Hotel