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SeaStar Hydraulic Steering System Part Numbers

Updated: 7 days ago

SeaStar Solutions offers a comprehensive range of hydraulic steering systems tailored for various boating and marine applications, each comprising specific components with unique part numbers.
SeaStar Solutions offers a comprehensive range of hydraulic steering systems tailored for various boating and marine applications, each comprising specific components with unique part numbers.

We provide this as a reference for those who are upgrading to our complete 350 HP Hydraulic Steering Systems, 700 HP Hydraulic Steering Systems, custom length steering hose lines, our faster 2.7 Helm, or 700 HP Front Cylinder or use our Self-Bleeding Kit (for one-person operation).


Most all our steering parts are compatible and interchanging with Sea Star to ensure that we can cost-effectively solve our customer rigging needs. Below is an organized overview of key boat hydraulic steering parts and their associated part numbers:


1. Hydraulic Helm Pumps

Capilano Series – Inboard Steering Helms

  • SeaStar Capilano Helm 1250V (HH5250) Rear Mount, Variable Displacement: 1.7–3.4 cu. in. – Ideal for small to mid-size inboard boats.

  • SeaStar Capilano Helm 1275V (HH5275) Rear Mount, Variable Displacement: 2.7–5.4 cu. in. – Best suited for larger inboard vessels requiring increased steering output.

SeaStar Standard Outboard Helms

  • HH5271-3 – 1.7 cu. in. Front Mount Helm

  • HH5273-3 – 2.0 cu. in. Front Mount Helm

  • HH5272-3 – 2.4 cu. in. Front Mount Helm

  • HH5261-3 – 1.7 cu. in. Rear Mount Helm

  • HH5262-3 – 2.4 cu. in. Rear Mount Helm

  • HH5291-3 – 1.7 cu. in. Sport Tilt Helm

  • HH5292-3 – 2.4 cu. in. Sport Tilt Helm

  • HH5741-3 – 1.7 cu. in. Classic Tilt Helm

  • HH5742-3 – 2.4 cu. in. Classic Tilt Helm

SeaStar Pro Series – High-Performance Helms

Perfect for high-speed outboard applications (60+ MPH)

  • HH5779-3 – 1.7 cu. in. Standard Mount

  • HH5778-3 – 1.7 cu. in. Rear Mount

  • HH5773-3 – 1.7 cu. in. Tilt Helm

  • HH5770-3 – 2.0 cu. in. Standard Mount

  • HH5771-3 – 2.0 cu. in. Rear Mount

  • HH5774-3 – 2.0 cu. in. Tilt Helm

  • HH5290-3 – 2.0 cu. in. Sport Tilt

  • HH5772-3 – 2.4 cu. in. Standard Mount

2. Hydraulic Steering Cylinders

Outboard Front Mount Steering Cylinders

  • Models: HC5340-3, HC5342-3, HC5345-3, HC5347-3, HC5348-3, HC5358-3

Other Mount Types

  • Side Mount Cylinder: HC5370-3

  • Splashwell Mount Cylinder: HC5380

  • Catamaran/Pontoon Cylinder: HC5375-3

Inboard Steering Cylinders

  • Models: HC5312-3, HC5313-3, HC5314-3, HC5318, HC5319

3. SeaStar Hydraulic Hose Kits

  • Standard Hydraulic Hose Kit (2 hoses): HO51xx

  • Bulkhead Hose Kit (2 hoses): HO81xx Note: 'xx' refers to length in feet (e.g., HO5108 = 8 ft hoses).

4. Hydraulic Fitting Kits

  • Add-A-Station Kit (Nylon/Copper): HF6010

  • Add-A-Station Kit (Hose): HF6007

  • Autopilot Fitting Kit (All Helms): HF5502

5. Steering Tubing

  • 3/8” Diameter Nylon Tubing: HT5xxx Available in custom lengths, perfect for low-pressure return lines.

6. Hydraulic Steering Fluid

  • SeaStar Hydraulic Oil – 1 Quart: HA5430

  • SeaStar Hydraulic Oil – 1 Gallon: HA5440 Recommended fluid for all SeaStar hydraulic systems for maximum performance.

7. Steering Service Parts

  • Helm Shaft Seal & Locknut Kit: HP6032

  • Steering Wheel Hardware Kit: SA27454P

8. Optional Accessories

  • Round Bezel Kit: HA5478

  • Backplate Kit: HA5418

  • 20° Dash Wedge Kit: HA5419

  • Power Assist Steering Unit: PA1200-2 Provides effortless control and better handling in high-torque conditions.

*Note: The 'xx' in part numbers (e.g., HO51xx) denotes variable lengths or specific configurations. It's essential to select the appropriate specifications based on your boat's requirements.


By utilizing the correct part numbers, you can ensure compatibility and optimal performance of your SeaStar steering system.

















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