Seastar Hh5271 Parts Diagram <ULTIMATE · 2026>

The SeaStar HH5271 (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

Most diagrams for the HH5271 focus on the external mounting assembly and the critical seal areas.

Dometic Seastar Hydraulic Helm Pump Front Mount 1.7 HH5271-3

The HH5271 is one of their product models, and finding a detailed parts diagram can be essential for maintenance, repairs, or upgrades. Here are some steps and resources you can use to find the parts diagram for your Seastar HH5271:

3. Marine Supply Stores and Online Marketplaces

8. Reservoir Tank & Fill Cap (Not always included – Part # 2151001 for the reservoir kit)

While not technically internal to the helm, the diagram often includes the plastic reservoir (non-pressurized) that mounts on top of the helm. It includes a breather cap and a dipstick. Cracks in the reservoir are common in older HH5271 units.

How to Find the Diagram Online

To see the visual "exploded view" diagram, I recommend visiting the official Seastar Solutions (formerly Teleflex) website. You can usually find it by:

  1. Go to a search engine.
  2. Type: Seastar HH5271 Installation Manual PDF.
  3. Open the PDF; the parts diagram is usually located near the back of the document (often on the last page).

If you have a specific question about a part or are trying to identify a leak, please describe what you see, and I can help you identify the likely culprit from the list above. Seastar Hh5271 Parts Diagram

The SeaStar (1.7 cu. in.) is a front-mount hydraulic helm pump designed for manual steering systems. It features an axial piston design where load-bearing points run on roller or ball bearings for smooth operation. Seatech Marine Products HH5271 Helm Parts List

A standard SeaStar HH5271 helm installation consists of several key external and internal components: Helm Pump Unit (HH5271-3): The main axial piston pump body. Steering Shaft: Standard 3/4" tapered marine-grade aluminum shaft. Shaft Nut: 5/8"-18UNF locknut used to secure the steering wheel. Woodruff Key:

Small semi-circular key that locks the steering wheel to the shaft. Fill Plug: Located on the front of the dash; available as Vented (HA5431) for single-station or Non-Vented (HA5432) for lower stations in multi-station setups. Mounting Hardware:

Includes four studs, washers, and locknuts for securing the helm to the dashboard. ORB Fittings: Modern "-3" models use positionable O-ring seal fittings (90° elbows). Seatech Marine Products Service and Seal Kits

For maintenance, such as fixing leaks at the steering shaft, two primary service kits are available:

Dometic Seastar Hydraulic Steering Helm 1.7 cu in - HH5271-4 The SeaStar HH5271 (and its modern version, the

Features * Compact helm has only a 4-7/16” foot print - needs only 3” dash hole (Tilt requires larger hole) * 1.7 cu.in. capacity. installation instructions - West Marine

The Dometic SeaStar HH5271 (1.7 cu. in.) helm pump is an axial piston pump designed for manual hydraulic steering. A parts diagram of this unit typically illustrates three main categories of components: the external mounting hardware, the front-facing seal assembly, and the internal pump core. Core Components of the HH5271 Diagram

An exploded view reveals how the steering wheel connects to the internal hydraulic mechanism. Major parts usually identified include: Shaft & Drive Components:

3/4" Tapered Shaft: The main drive point for the steering wheel.

Woodruff Key: A semi-circular key that locks the steering wheel to the shaft to prevent slipping.

Nyloc Nut (5/8"-18): Secures the steering wheel onto the shaft. Seal Assembly (Front Mount): Local Marine Supply Stores : Local stores that

Shaft Seal (Quad Ring): A critical failure point that prevents fluid from leaking out of the shaft opening.

Top Cover & Screws: The exterior plate that holds the shaft seal in place. Internal Pump Assembly:

Axial Pistons: Usually 7 or more pistons that move fluid when the shaft is rotated.

Roller & Ball Bearings: Support the rotor and piston race for low-friction operation.

Lock Valve & Relief Valve: Internal safety mechanisms that prevent "kickback" from the engine and protect the system from over-pressurization. Common Service and Repair Kits

Most "diagram" searches are initiated to identify parts for the HP6032 Helm Seal Service Kit, which is the most common repair package for the HH5271. Included in HP6032 Kit Quad Ring Seal Prevents fluid leaks at the steering shaft. Woodruff Key Locks the steering wheel to the pump shaft. Top Cover Protects the seal and houses mounting screws. Nyloc Nut Final fastener for the steering wheel. ORB Fittings Connects hydraulic lines to the back of the helm. No (Standard with HH5271-3/4) Evolution: HH5271 vs. HH5271-3 SeaStar Hydraulic Helm Pump HH5273 rebuild

5. Reservoir and Filling Components

The HH5271 can be used with a remote reservoir or an integrated one (depending on the variant. Standalone HH5271 often lacks a built-in reservoir, but if equipped):