Description

SeaStar HC6345-3 Outboard PRO Front Mount Hydraulic Boat Cylinder

The SeaStar HC6345-3 Outboard PRO Front Mount Hydraulic Boat Cylinder is designed for high-performance marine vessels that demand precision and reliability, especially those with outboard engines up to 350HP.

Ideal for boats that can reach speeds of 55MPH or more, such as bass boats, flats combo race/ski boats, and other performance-oriented craft, this cylinder ensures a solid steering feel even at high speeds.

The SeaStar HC6345-3 Outboard PRO Front Mount Hydraulic Boat Cylinder is a must-have for boats with Mercury 115XS – 300XS engines (2002 and newer). SeaStar, a leader in hydraulic and mechanical marine steering, equips this cylinder with stainless steel adjustable O-ring fittings for easier installation and robust bushings to enhance durability.

FEATURES

• Designed for high-performance outboard boats with speeds of 55+ MPH
• Stainless steel adjustable O-ring (-5ORB) fittings for easier installation
• Robust bushings for enhanced durability
• Keyed support bracket to prevent racking and provide a solid feel
• Optimized for Mercury 115XS – 300XS (2002 and newer) outboards
• Compatible with single engine outboards
• Designed for boats traveling 55+ MPH
• Front mount cylinder for SeaStar PRO hydraulic systems

SPECIFICATIONS

• Bore Dia.: 1.25″
• Shaft Dia.: 0.5″
• Stroke: 9″
• Displacement: 9.3 cu.in.

Installation & Caution

• Remove any caps, plugs, or screws from the tiller arm before installation
• Ensure the tiller bolt head is properly secured with a wrench during installation to avoid loss of steering control
• Do not use NPT fittings; only -3 ORB hose fittings should be used
• Regular oil level and system checks are critical for safe operation
• Avoid continuous kinking or chafing of steering hoses to prevent potential rupture
• Ensure no interference between jack plates and the steering cylinder
• Engine removal may be required for splashwells under 30″ in width