SeaStar HC5345-3 Front Mount Outboard Steering Cylinder, 8.34 Cubic Inch, Single Engine

The SeaStar HC5345-3 is a front mount hydraulic steering cylinder built for single-engine outboard boats. It connects the helm to the outboard's steering arm, converting hydraulic pressure from the helm pump into the mechanical force that turns the engine. The cylinder has an 8.34 cubic inch volume capacity and uses positionable stainless steel O-ring (ORB) fittings, which allow the hydraulic hose connections to be angled for easier routing during installation. Its end gland sealing system uses an 8-hole design intended to improve serviceability and to better resist repeated compression set in the marine environment. The cylinder also provides independent engine tilt, which is required for twin and triple engine installations even when only one cylinder is in use per engine.

The HC5345-3 is built and certified to meet standards established by the American Boat and Yacht Council (ABYC) and the International Standards Organization (ISO), and it meets ABYC and NMMA certification requirements. It is suited to cruisers, runabouts, center console boats, and offshore fishing boats. The cylinder is compatible with the SeaStar Power Assist pump (PA1200-2) for boats that want a lighter, automotive-style steering feel. SeaStar hydraulic steering systems, including this cylinder, are tested and certified for use with SeaStar hydraulic fluid and SeaStar hydraulic hoses; using non-certified fluid or hoses with this cylinder may void the warranty and could result in loss of steering control. The product is designed and manufactured in North America and is backed by a two-year recreational user warranty against manufacturing defects.

Specifications

• Brand: SeaStar
• Manufacturer Part Number: HC5345-3
• Model Number: HC53453
• Product Type: Outboard Front Mount (O/B FM) Power/Manual Steering Cylinder
• Engine Type: Outboard
• Mounting Type: Engine Mount, Front Mount
• Recommended Application: Single engine installations
• Volume Capacity: 8.34 cubic inches
• Maximum Horsepower Rating: 350 horsepower
• Fittings: Positionable stainless steel O-ring (ORB) fittings
• Sealing System: 8-hole end gland sealing system
• Material: Plastic
• Weight: 9.5 pounds
• Certifications: ABYC and NMMA certified
• Compatible Upgrade: SeaStar Power Assist pump (PA1200-2)
• UPC: 731957916754
• Warranty: Two-year recreational user warranty against manufacturing defects

Fitment

Intended for single-engine outboard-powered boats not exceeding 75 mph, not running surface-piercing props, and not exceeding the maximum U.S. Coast Guard horsepower rating for the vessel. Maximum horsepower rating of 350 horsepower.

Frequently Asked Questions

What is the SeaStar HC5345-3 used for? The HC5345-3 is a front mount hydraulic steering cylinder that connects the helm pump to a single outboard engine's steering arm, converting hydraulic pressure into the mechanical motion that steers the boat.

Is the HC5345-3 rated for twin or triple engine setups? The HC5345-3 is designed for single engine installations, though its independent engine tilt feature is also relevant on twin and triple engine boats where one cylinder is used per engine.

What is the volume capacity of this steering cylinder? The SeaStar HC5345-3 has an 8.34 cubic inch volume capacity, which factors into the number of helm turns lock-to-lock along with the helm selected.

What is the maximum horsepower rating for the HC5345-3? This cylinder is rated for outboard engines up to 350 horsepower.

What fittings does the HC5345-3 use? It uses positionable stainless steel O-ring (ORB) fittings, which can be angled during installation to make hydraulic hose routing easier.

How much does the HC5345-3 weigh? The HC5345-3 steering cylinder weighs 9.5 pounds.

Can the HC5345-3 be used with a power steering system? Yes, the HC5345-3 is compatible with the SeaStar Power Assist pump (PA1200-2), which provides an automotive-style, fingertip-control steering feel.

Does the HC5345-3 differ from SeaStar's splashwell mount cylinder? Yes, the HC5345-3 is a front mount cylinder, which is distinct from SeaStar's splashwell mount cylinder (a different part number); the splashwell mount cylinder is not suitable for engines fitted with factory power steering.

What certifications does the HC5345-3 meet? The HC5345-3 is built and certified to meet ABYC and ISO safety and quality standards and meets ABYC and NMMA certification requirements.

What fluid and hoses should be used with the HC5345-3? SeaStar hydraulic steering systems, including the HC5345-3 cylinder, are tested and certified for use only with SeaStar hydraulic fluid and SeaStar hydraulic hoses; using non-certified products may void the warranty and could cause loss of steering control.

What warranty comes with the HC5345-3? SeaStar backs the HC5345-3 with a two-year recreational user warranty against manufacturing defects.

What boat types is the HC5345-3 suited for? The HC5345-3 is intended for cruisers, runabouts, center console boats, and offshore fishing boats with a single outboard engine.