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SeaStar HC5345-3 Front Mount Hydraulic Outboard Steering Cylinder

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SKU:
HC5345-3
Condition:
New
  • SeaStar HC5345-3 Front Mount Hydraulic Outboard Steering Cylinder
  • SeaStar HC5345-3 Front Mount Hydraulic Outboard Steering Cylinder
  • SeaStar HC5345-3 Front Mount Hydraulic Outboard Steering Cylinder
  • SeaStar HC5345-3 Front Mount Hydraulic Outboard Steering Cylinder
  • SeaStar HC5345-3 Front Mount Hydraulic Outboard Steering Cylinder
  • SeaStar HC5345-3 Front Mount Hydraulic Outboard Steering Cylinder
MSRP: $1,091.99
$864.99
— You save $227.00
In Stock - Ships FREE 2 DAY AIR Same Day (Order By 5pm EST M-F)

Description

SeaStar HC5345-3 Front Mount Hydraulic Outboard Steering Cylinder

Heavy-Duty Hydraulic Steering Cylinder for Single, Twin & Triple Outboard Engines

The Dometic SeaStar HC53453 is a high-performance front mount hydraulic steering cylinder designed for single, twin, or triple outboard engine installations. Built to meet the demands of today’s heavier, higher-horsepower engines, this cylinder features robust construction, a new 8-hole end gland sealing system, and positionable stainless steel ORB fittings for superior performance and easy installation.

With enhanced durability, improved hose routing, and compatibility with all SeaStar helm pumps and power assist systems, the HC5345-3 is ideal for center console boats, offshore fishing vessels, and high-performance cruisers.

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Key Features & Benefits

  • Supports Up to 700 HP (Total Power, Counter-Rotating) – Ideal for single, twin, or triple engine setups.
  • Independent Engine Tilt – Allows separate engine tilt control on multi-engine installations.
  • Robust & Corrosion-Resistant Design – Engineered to withstand repeated compression and harsh marine environments.
  • Upgraded Sealing System – New 8-hole end gland design and proprietary sealing system enhance durability and simplify servicing.
  • Positionable Stainless ORB Fittings – Upgraded from 1/4" NPT to -5 ORB stainless steel fittings for easier, leak-free installation and improved hose routing.
  • Smooth & Responsive Steering – Designed to work with all SeaStar helm pumps, including Power Assist systems.
  • Variable Lock-to-Lock Turns – Adjusts with helm selection to deliver a tailored steering response.

Technical Specifications

  • Direct Replacement for the HC5345 (-3 part number adds -5 ORB fittings & internal upgrades for longevity and owner experience)
  • Mount Style: Front Mount, Pivoting
  • Shaft Diameter: 0.75" (19mm)
  • Stroke Length: 8.00" (203mm)
  • Cylinder bore: 1.375 in (~35 mm)
  • Displacement (fluid volume): 8.34 cu in (136.6 cc)
  • Ports / fittings: Positionable stainless ORB hose fittings (-5 ORB); do not use NPT
  • Overall dimensions (approx.): width 21-3/4 in (552 mm), depth 4-7/8 in (124 mm), height 2-5/8 in (67 mm)
  • Included in the Box: Complete cylinder with fittings, HA5438 Filler Kit & Instruction Manual

Downloads & Resources:

Link Link Description
LINK (PDF)  SeaStar Front Mount Outboard Cylinder Installation Manual
LINK (WEB) SeaStar Front Mount Cylinder Application Guide
LINK (WEB) Dometic SeaStar Hydraulic Parts Lookup
LINK (PDF) SeaStar Hydraulic Steering Selection Guide
LINK (WEB) Tech Support Page (First Link)
LINK (PDF) SeaStar Front Mount Cylinder Fill and Bleeding Instructions
LINK (PDF) Dometic SeaStar Warranty Sheet

Kits That Include the HC5345-3

Kit Link Description
HK6400-4 1.7 Front Mount Helm Pump, Cylinder, Oil & Steering Hose
HK6400TC-4 1.7 Classic Tilt Helm Pump, Cylinder, Oil & Steering Hose
HK6400TS-4 1.7 Sport Tilt Helm Pump, Cylinder, Oil & Steering Hose

Spare Parts for the HC5345-3

Part Link Description
HS5167 Seal Kit without wrench for most front mount cylinders
HS5157 Seal Kit with wrench for most front mount cylinders
HP6016 Support Rod for most front mount cylinders
HF5548 Bleeder Kit for most front mount cylinders
HF6004 -5 ORB Fittings for most -3 front mount cylinders
HA5477 Ground Strap for most front mount cylinders
HP6033 Spacer Kit for most Pivot Plates front mount cylinders
HP6034 Adjusting Nut for most front mount cylinders

Related Parts

Part Link Description
HO6001 Single Cylinder Tie Bar
HO6002 Twin Cylinder Tie Bar
HO6003 OMC Ficht/Suzuki Tie Bar
HA5520 Twin Engine Dual Cylinder Drive Bracket
HA5521 Twin Engine Single Cylinder Drive Bracket
HA5522 Hardware Kit Adjustable Tie Bar

Other SeaStar Parts

Part Number Description
Power Assist Units Latest Gen Power Assists
Auto Pilot Units SeaStar Autopilots
Power Assist Autopilot Combos SeaStar PA/AP Combos
SeaStar Hose Hose for SeaStar & BayStar
SeaStar Helm Pumps SeaStar & BayStar Helms
SeaStar Cylinders SeaStar & BayStar Cylinders

Questions?

  • No Sales Tax on Purchases Outside of California
  • Buy Now Pay Later with Affirm or PayPal Pay Later
  • Formerly Teleflex, SeaStar is now Dometic Marine
  • Seatech Marine Products, Inc. is an authorized dealer, and service center for Dometic Marine
  • FREE 2 Day Air Shipping to the Lower 48 States, USPS Priority Mail to AK, HI, USVI & Puerto Rico

International Customers: We Ship Worldwide, Shipping Cost May Quote Too High on Our Website, contact us for a quote.

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Warranty Information

Seatech Marine Products is an authorized dealer for Dometic that distributes Seastar Products, this part has a 2 Year Limited Warranty from them. Please visit their website for full details: https://www.dometic.com/en-us/outdoor/support/warranty-statements
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2 Reviews

  • 4
    Replacement of same item

    Posted by Jack Bosch on 8th Aug 2020

    Works fine

  • 5
    HC5345-3

    Posted by Thomas F. on 5th Jun 2019

    Thank you for the timely delivery, the cylinder is working great.

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