Seastar Hh5271 Parts Diagram ((new)) File

The HH5271 does not have a dedicated bleed screw. Bleeding is done at the steering cylinder or by using the fill port and slowly turning the wheel lock-to-lock.

The Seastar HH5271 is one of the world's most popular hydraulic steering helms for marine vessels. Manufactured by Dometic SeaStar Solutions (formerly Teleflex Marine), this helm pump is an axial piston pump designed to provide smooth, efficient, no-feedback steering for a wide range of boats.

The (and its modern version, the HH5271-3 ) is a 1.7 cu. in. front-mount hydraulic helm pump used in outboard and inboard steering systems. It features an axial piston design supported by three roller bearings for smooth operation. Parts & Components Diagram

A series of small reciprocating pistons that generate hydraulic pressure when the wheel rotates. Seastar Hh5271 Parts Diagram

Whether you are rebuilding a leaking helm with an , retrofitting an old dashboard cutout with a 291908 mounting kit , or simply checking the fluid level before a long offshore trip, knowing how the HH5271 goes together is an invaluable skill. Regular inspection and maintenance of the helm pump, hoses, fittings, and steering cylinder will ensure smooth, reliable steering control for years to come. If in doubt, always consult the official SeaStar installation manual for diagrammatic data specific to your application, and never hesitate to contact a certified marine technician for complex repairs.

The HH5271 is a standard front-mount hydraulic helm. Below are the common reference numbers, part names, and their typical Seastar part numbers.

Disclaimer: The part numbers and specifications mentioned in this article are based on publicly available data as of 2025. Always refer to the latest manufacturer documentation for your specific helm serial number. The HH5271 does not have a dedicated bleed screw

If oil drips from the area where the steering wheel shaft enters the helm, the shaft seal has failed.

| Symptom | Likely Faulty Part (From Diagram) | |--------|-------------------------------------| | Steering wheel leaks fluid from behind the wheel | Input shaft seal (#2171008) | | Hard steering in one direction only | One of the two check valves (#2086002) stuck | | Spongy steering with air bubbles | End cap O-rings (#2171010) or reservoir seals | | No steering but wheel spins freely | Key on input shaft sheared (#2171001) | | Fluid sprays from the helm top | Fill cap breather clogged or reservoir cracked |

A standard HH5271 helm assembly consists of several critical internal and external parts required for installation and maintenance: Helm Shaft : A marine-grade aluminum tapered shaft that connects directly to the steering wheel. Filler Port and Plug : Located at the top of the helm for adding SeaStar Hydraulic Steering Fluid front-mount hydraulic helm pump used in outboard and

SeaStar HH5271 is a front-mount 1.7 cubic inch hydraulic helm pump designed for boats up to 50 feet with single engines up to 350HP. Understanding its internal layout is key for maintenance, such as fixing common shaft seal leaks or air in the system. Core Component Diagram Go to product viewer dialog for this item.

Warning: Be cautious of third-party diagrams from generic parts sites. Some mislabel components, especially the HH5271 vs. HH5273 (which has a different displacement).

Connect the hydraulic hoses to the back of the helm.