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O Ring, Intake

Yamaha 4 Stroke
Item#:
13557
Cross Reference#:
6D8-13557-00-00
Manufacturer Item:
6D8-13557-00-00
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
10.45
Each

Ring Kit, Piston .010

Force / Chrysler Bore Size 3.322
Item#:
260-10
Manufacturer Item:
FSA335260
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
26.73
Each

Sensor, Knock

Mercruiser 5.0L 5.7L 6.2L MPI 230,260,350Mag 350Mag EFI
Item#:
2-97-8066
Cross Reference#:
806612T
Manufacturer Item:
806612T
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
61.37
Each

Water Pump Kit w/Housing

Mercury 6-15hp
Item#:
4208P
Cross Reference#:
12051
42089A3
42089A3
42089A4
42089A4
42089A5
Manufacturer Item:
42089A5
Manufacturer:
Pro Marine
Available:
In Stock
69.6897
Your Price:
62.00
Each

Gasket Thermostat

Johnson/Evinrude 40-225hp 1993 & Later
Item#:
10-1155
Cross Reference#:
0339044
0765579
339044
765579
Manufacturer Item:
339044
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
1.40
Each

Gasket, Valve Cover

Seadoo 02 & Later All 4Tec PWC/Jetboat Model
Item#:
S6905
Cross Reference#:
0460582
0462554
290950820
420950820
462554
Manufacturer Item:
420950820
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
25.24
Each

Gasket, Cylinder Head

Seadoo 02 & Later All 4Tec PWC/Jetboat/Ski-Doo
Item#:
S6900
Cross Reference#:
0460579
0461926
290950770
420950770
420950771
461926
5950771
Manufacturer Item:
420950770
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
99.70
Each

Gasket, Thermostat

Tohatsu 60/70/90 hp
Item#:
10-7320
Cross Reference#:
3A3021040M
353021040M
Manufacturer Item:
353021040
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
3.21
Each

Nipple, VRO Pump

Johnson/Evinrude
Item#:
345238
Cross Reference#:
0343163
0345238
0769128
343163
345238
Manufacturer Item:
345238
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
6.17
Each

Gasket, Reed

Tohatsu 90hp
Item#:
10-7325
Cross Reference#:
3B7021040
3B7021040
3B7021040M
3T9021040
3T9021040M
Manufacturer Item:
3B7021040
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
7.81
Each

Nipple, VRO Pump

Johnson/Evinrude
Item#:
345239
Cross Reference#:
0343164
0345239
0769484
343164
345239
Manufacturer Item:
345239
Manufacturer:
Pro Marine
Available:
In Stock
Your Price:
7.06
Each

Pro Marine 350-HSTEER-CYL Hydraulic Steering Cylinder

Replacement Hydraulic Cylinder for 350-HSTEER Systems

Replacement Hydraulic Steering Cylinder

Pro Marine 350-HSTEER-CYL Hydraulic Steering Cylinder

The Pro Marine 350-HSTEER-CYL Hydraulic Steering Cylinder is the replacement steering cylinder used with the Pro Marine 350-HSTEER hydraulic steering system. It is designed for high-horsepower single outboard setups where smooth, controlled steering response is critical.

This is the cylinder only. Helm pump, hoses, steering fluid, and fill/bleed accessories are sold separately unless purchased as part of the complete 350-HSTEER system.

What This Cylinder Is Used For

The steering cylinder converts hydraulic pressure from the helm pump into side-to-side movement at the outboard engine. It is the component that physically moves the engine when you turn the steering wheel.

If your current cylinder is leaking, damaged, binding, or worn, replacing it can restore proper steering control and improve the overall feel of the system.

Pro Tip: When replacing a steering cylinder, inspect your hydraulic hoses, helm pump, fittings, and fluid condition at the same time. A clean hydraulic system helps protect the new cylinder and improves steering performance.

Read our 350-HSTEER Steering Comparison & Pro Tips Guide

Best Applications

Application Recommended Use
350-HSTEER Systems Replacement hydraulic steering cylinder
Single Outboards up to 350HP High-horsepower hydraulic steering applications
Bass Boats Responsive steering and control at speed
Bay Boats Smooth steering in shallow and open water
Center Consoles Reliable steering feel for offshore and coastal use

Build or Service Your Steering System

Complete Steering Kit

Need the full system instead of just the cylinder? The complete kit includes the cylinder, helm pump, hydraulic fluid, and fill hose assembly.

View 350-HSTEER Complete Kit

Helm Pump

Pair this cylinder with the matching Pro Marine helm pump for proper hydraulic steering operation.

View 350-HELM-025 Helm Pump

Hydraulic Hoses

Select the correct hydraulic hose length for your boat, jack plate, setback, and rigging route.

Shop Pro Marine Hydraulic Hoses

Fluid & Fill Hose

Hydraulic fluid and a fill hose assembly help make installation and bleeding easier during service.

View PRO-OIL15 Hydraulic Fluid
View 102P Fill Hose Assembly

Complete Your Steering Setup

Key Features and Benefits

  • Replacement hydraulic steering cylinder for 350-HSTEER systems
  • Designed for high-horsepower single outboard steering applications
  • Helps restore smooth steering movement and control
  • Front-mount hydraulic steering cylinder design
  • Works with hydraulic helm, hose, and fluid circuit
  • Good option for service, repair, or steering system rebuilds

System Function and Connections

  • System Type: Hydraulic outboard steering
  • Component Type: Steering cylinder
  • Connection Type: Hydraulic hose connections to helm circuit
  • Typical Use: Single outboard applications up to 350HP when used with the proper system
  • Related Components: Helm pump, hydraulic hoses, steering fluid, fittings, and fill/bleed tools

FAQ

Is this the complete steering system?
No. This listing is for the hydraulic steering cylinder only. The complete system is available as the Pro Marine 350-HSTEER kit.

What system does this cylinder work with?
This cylinder is designed for use with the Pro Marine 350-HSTEER hydraulic steering system.

Are hydraulic hoses included?
No. Hydraulic hoses are sold separately so you can choose the correct length for your boat and rigging layout.

When should I replace a steering cylinder?
Replace the cylinder if it is leaking, damaged, binding, corroded, or no longer holding proper steering control.

Dealer Discounts & Store Policies

Dealer / Marine Industry Discounts

Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.

Apply for a Dealer Account

Shipping Policy

  • Free shipping on orders over $100 (continental U.S.).
  • Orders ship via UPS, USPS, and FedEx.
  • Orders received before 5:30 PM EST ship the same business day.
  • Typical delivery time is 1–5 business days.

30-Day Return Policy

  • Returns accepted within 30 days of delivery.
  • Items must be new, unused, and in original packaging.
  • Return authorization is required before sending items back.

Need help with a return or order question?
Contact Us
Phone: 941-721-3000

Searchable Terms

350-HSTEER-CYL, Pro Marine hydraulic steering cylinder, hydraulic steering cylinder, outboard steering cylinder, front mount steering cylinder, 350-HSTEER replacement cylinder, hydraulic steering repair, boat steering cylinder

Item#:
350-HSTEER-CYL
Manufacturer:
Pro Marine
Available:
In Stock
 
Oversized Shipping
Your Price:
704.41
Each
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