SeaStar HK7500A-3 PRO Hydraulic Steering System Kit Without Hoses


SeaStar HK7500A-3 PRO Hydraulic Steering System Kit Without Hoses
SKU: 563533
Mfg# HK7500A-3
UNIT: Each
In Stock - Ships out in 1 Business Day

SeaStar HK7500A-3 PRO Hydraulic Steering System Kit Without Hoses

The SeaStar PRO (HK7500A3) is designed for high torque SINGLE non-power-assisted up to 350HP outboard applications such as high performance bass boats. SeaStar PRO has steered the BASS Masters Classic since 1994 and it's the choice of high performance outboard boat builders. It is suitable for use with high-performance propellers and jack plates.


  • Single Non-Power Assisted Outboards Up to 350HP
  • SeaStar PRO has been installed on premium bass boats as original equipment for many years. It's the ideal upgrade for twin-cable mechanical steering.

Features and Benefits:

  • Complete Kit less hoses - Helm Pump, steering ram/cylinder, fittings, oil, bleeder kit, and detailed instructions.
  • The PRO unique valve system keeps pressure at both hydraulic lines equal - the wheel feels solid and sure at all times.
  • The PRO cylinders are manufactured with longer shaft bushings and larger pivot bushings for an even more solid feel.
  • Low friction hydraulic steering - less steering fatigue
  • Compact helm pump - 4 7/16" footprint
  • Factory Swaged hoses - kevlar reinforced - rated at 1500PSI. NORMAL HOSES ARE RATED @1000PSI

Specifications for Items Included with Pictures:

  • HH5770-3 PRO 2.0 Front Mount Helm Pump
    • Turns Lock to Lock: 4.25
    • Dash Cut Out Dia: 3"
    • Footprint Dimensions: 4.4375"
    • Shaft Size: 3/4" Taper
  • HC6345-3 PRO Front Mount Outboard Cylinder
    • Bore Dia: 1.375"
    • Nominal Shaft Dia: 0.75"
    • Displacement: 8.34in³/rev
  • HA5430H SeaStar Hydraulic Steering Fluid
    • Quantity: 2 Quarts

Application Guide:

Honda1996-Date150-300HPHC6345-3BF Engines See Below
Honda2001-DateBF200-BF250HC6345-3Requires HA5472
Honda2003-DateBF150HC6345-3Requires HA5472






150-250HP 4 Stroke

150-300HP Etech

E250HP Vindicator





Mercury1989-Date150-300 XS EnginesHC6345-3
Mercury1989-Date150-300HP 2-Stroke & 4 StrokeHC6345-3
Suzuki1986-Date150-300HP 2-Stroke & 4 StrokeHC6345-3
Yamaha1986-Date150-350HP 2-Stroke & 4 StrokeHC6345-3

Helm Pump and Cylinder Dimensions:

How to Measure Hydraulic Steering Hoses:

SeaStar PRO Hose Selection:

  • HO57XX SeaStar PRO Hoses without Bulkhead fittings (Included in Kits) (2 hoses per box, Can Be Purchased In Lengths 2'-30')
  • HO82XX SeaStar PRO Hoses with Bulkhead fittings (2 hoses per box, Bulkhead fittings are separate)
  • HO89XX SeaStar PRO Hoses with Double Stainless Bulkhead Fitting (2 hoses per box, Bulkhead fitting couples both hoses together)
  • HO87XX SeaStar PRO Hoses with Single Stainless Bulkhead Fittings (2 hoses per box, Stainless bulkhead per hose separated hoses)

Related Items:

  • SeaStar PRO Tilt Helm Kit - Round Base (Sport)
  • SeaStar PRO Tilt Helm Kit - Square Base (Classic)
  • SeaStar PRO HK7514A-3 Kit with SeaStar PRO Power Assist - Drives perfect with no effort
  • SeaStar HA5419 20° Dash Wedge Kit

Downloads Section: 

Outboard Cylinder Installation Manual [PDF] Front Mount Helm Pump Installation Manual [PDF] SeaStar Catalog [PDF]

  • Formerly Teleflex Marine

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Question: How do I find engine parts for my boat's motor?

Answer: Use our SONAR engine parts finder tool. You can search by engine make, model, year or OEM part number. If you still can't find what you are looking for, give us a call 1-800-998-9508


The length of the warranty may vary by product, please refer to your product for the exact terms and conditions of the warranty for your purchase.


  • All returns must be recevied within 30 days of receipt of the order.
  • Manufacturer defects reported within 30 days of receipt will be supplied a pre-paid label for return shipping upon approval.
  • Please contact Go2marine LFS Marine and Outdoor for Manufacture Defects, Returns and help with Warranties.