SeaStar HC5358-3 Outboard Front Mount Cylinder (225HP Four Stroke Yamaha)

SeaStar HC5358-3 Front Mount Hydraulic Outboard Steering Cylinder

The Dometic SeaStar HC53583 is a front-mount center-push steering cylinder designed for twin outboard engine applications with push-pull steering geometry between engines. Commonly used on Suzuki DF series, Yamaha, Evinrude/Johnson, and COX Diesel outboards, this cylinder offers robust, corrosion-resistant construction and precise steering control up to 700 horsepower combined.

With enhanced durability, improved hose routing, and compatibility with all SeaStar helm pumps and power assist systems, the HC5358-3 is ideal for center console boats, offshore fishing vessels, and high-performance cruisers.

Key Features & Benefits

• Supports Up to 700 HP (Total Power, Counter-Rotating).
• Independent Engine Tilt – Allows separate engine tilt control on multi-engine installations.
• Robust & Corrosion-Resistant Design – Engineered to withstand repeated compression and harsh marine environments.
• Upgraded Sealing System – New 8-hole end gland design and proprietary sealing system enhance durability and simplify servicing.
• Positionable Stainless ORB Fittings – Upgraded from 1/4" NPT to -5 ORB stainless steel fittings for easier, leak-free installation and improved hose routing.
• Smooth & Responsive Steering – Designed to work with all SeaStar helm pumps, including Power Assist systems.
• Variable Lock-to-Lock Turns – Adjusts with helm selection to deliver a tailored steering response.
• Warranty: 2 Year Limited
• Made in Canada!

Will This Cylinder Work on My Boat?

Technical Specifications

• Direct Replacement for the HC5358 (earlier generation; “-3” adds -5 ORB ports and internal upgrades)
• Mount Style: Front Mount, Pivoting
• Shaft Diameter: 0.75" (19mm)
• Stroke Length: 8.00" (203mm)
• Cylinder bore: 1.375 in (~35 mm)
• Displacement (fluid volume): 8.34 cu in (136.6 cc)
• Ports / fittings: Positionable stainless ORB hose fittings (-5 ORB); do not use NPT
• Overall dimensions (approx.): width 21-3/4 in (552 mm), depth 4-7/8 in (124 mm), height 2-5/8 in (67 mm)
• Weight (approx.): 9.5lbs
• Included in the Box: Complete cylinder with fittings, HA5438 Filler Kit & Instruction Manual

Downloads & Resources

Spare Parts for the HC5358-3

Related Parts

Other SeaStar Parts

Questions?

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