SeaStar HC5358-3 Front Mount Hydraulic Outboard Steering Cylinder
The Dometic SeaStar HC53583 is a front-mount center-push steering cylinder designed for twin outboard engine applications with push-pull steering geometry between engines. Commonly used on Suzuki DF series, Yamaha, Evinrude/Johnson, and COX Diesel outboards, this cylinder offers robust, corrosion-resistant construction and precise steering control up to 700 horsepower combined.
With enhanced durability, improved hose routing, and compatibility with all SeaStar helm pumps and power assist systems, the HC5358-3 is ideal for center console boats, offshore fishing vessels, and high-performance cruisers.

Key Features & Benefits
- Supports Up to 700 HP (Total Power, Counter-Rotating).
- 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.
- Warranty: 2 Year Limited
- Made in Canada!
Technical Specifications
- Direct Replacement for the HC5358 (earlier generation; “-3” adds -5 ORB ports and internal upgrades)
- 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)
- Weight (approx.): 9.5lbs
- Included in the Box: Complete cylinder with fittings, HA5438 Filler Kit & Instruction Manual
Will This Cylinder Work on My Boat?
Link |
Link Description |
SeaStar Front Mount Cylinder Application Guide |
LINK (WEB) |
Dometic SeaStar Hydraulic Parts Lookup |
LINK (WEB) |
SeaStar Hydraulic Steering Selection Guide |
LINK (PDF) |
Tech Support Page (First Link) |
LINK (WEB) |
Downloads & Resources
Link |
Link Description |
LINK (PDF) |
SeaStar Front Mount Outboard Cylinder Installation Manual |
LINK (PDF) |
SeaStar Front Mount Cylinder Fill and Bleeding Instructions |
LINK (PDF) |
Dometic SeaStar Warranty Sheet |
LINK (WEB) |
SeaStar Cylinder REBUILD SERVICE |
Spare Parts for the HC5358-3
Part Link |
Description |
HS5167 |
Seal Kit without wrench for most front mount cylinders |
HS5157 |
Seal Kit with wrench for most front mount cylinders |
HA5430H |
Hydraulic Oil specifically for SeaStar |
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 |
HC6345-3 |
PRO Front Mount Hydraulic Boat Cylinder |
HC5345-3 |
Universal front-mount cylinder for most single, twin, or triple outboard setup |
HC5348-3 |
Designed specifically for Suzuki twin engines with factory center-push brackets |
HC5358-3 |
Center-push cylinder for twin outboards on Suzuki, Yamaha, Evinrude, and COX |
HC5445-3 |
Heavy-duty front-mount cylinder for high-horsepower or high-torque outboards |
HC5347-3 |
Legacy front-mount cylinder for early Yamaha 2-stroke and 4-stroke V6 engines |
HO5090 |
Low Horsepower Outboard Engine Spacer Kit |
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
Questions?
- No Sales Tax on Purchases Outside of California
- Buy Now Pay Later with Affirm or PayPal Pay Later
- FREE Ground Shipping to the Lower 48 States
- Formerly Teleflex, SeaStar is now Dometic Marine
- Seatech Marine Products, Inc. is an authorized dealer, and service center for Dometic Marine
International, USVI, Puerto Rican, Hawaiian & Alaskan Customers: We Ship Worldwide and USPS, Shipping Cost May Quote Too High on Our Website, Contact Us for A Quote.