Mavimare GF90BT Outboard Hydraulic Steering System up to 80HP

The Mavimare GF90BT is a compact, reliable, and easy-to-install hydraulic steering system designed for single outboard engines up to 80 HP.

Ideal for smaller boats, inflatables, tenders, fishing boats, and recreational craft, it delivers smooth, precise steering with minimal effort.Featuring a frontal mounting balanced bullhorn cylinder (MC90B), the GF90BT offers excellent responsiveness and straightforward installation, even in tight splash well spaces thanks to its innovative two-piece support rod.

Contents

• Helm Pump: GM3-MRA (with integrated relief valve and non-return valve)
• Steering Cylinder: MC90B (compact balanced bullhorn type with universal lever and high-performance guide)
• Hydraulic Hoses: 2 × 5 m (total 10 m) SAE 100 R7 1/4" with fittings pressed on one end
• Fittings: Complete set of chrome-plated brass ORB-style fittings (1 kit GTN7X10916ORB + 1 kit AC10/T916)
• Hydraulic Oil: 1 liter of Mavimare H-AP51 (ISO VG 15 equivalent)
• Accessories: Fast-connection filler tube kit (Art. X.372) for easier filling and bleeding

Specifications

• Displacement: 14 cm³ per revolution
• Number of pistons: 7
• Maximum working pressure: 50–60 bar (relief valve typically set at 70 bar)
• Mounting: Flush or semi-flush (square bezel/flange included)
• Weight: Approximately 2.8 kg
• Cylinder (MC90B)Type: Balanced frontal bullhorn
• Stroke: 100 mm
• Displaced volume: 75 cm³ (balanced chambers)