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Seastar HC5805 SeaStar Power Steering Cylinder

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Product Description

Teleflex HC5805 SeaStar Power Steering Single 9" Cylinder. HC5805 9" x 2.5" Cylinder for up to 100' (31m) standard or 70' (22m) heavy duty displacement hulls. Also used for planing hulls up to 110' (34m).

How It Works:

  • SeaStar hydraulic power steering uses the ships engine(s) to provide the "POWER" for the power steering system, via an engine or electric motor driven hydraulic pump.
  • A manual hydraulic steering system consisting of a standard SeaStar helm and a hydraulic steering cylinder, (fitted with an integral servo cylinder and a power steering valve) supplies the "control" portion of the power steering system.
  • Under normal conditions, with engines running, a hydraulic oil supply is in a stand-by mode, ready to be directed to the steering cylinder as dictated by the steering wheel, servo cylinder and power steering valve.
  • Turning the steering wheel left or right causes the power system to go from 'stand-by' into 'operating' mode and moves the steering cylinder accordingly.
  • In the event of a power source failure, hydraulic oil is automatically pumped directly from the steering helm into the servo and steering cylinder, providing the helmsman with manual back-up steering.
  • An engine room mounted oil reservoir allows easy system fill and assists the in-line oil cooler in cooling the hydraulic oil. An in-line oil filter helps protect the steering system components against contaminants.


  • Effortless steering from docking to top speed
  • Responsive steering 3 1/2, turns lock to lock (or to suit)
  • Automatic manual back up steering
  • Simplified installation
  • Multiple steering stations
  • Easy autopilot interface


  • System designed to use SeaStar Oil (Mil spec H5606) or Dexron II (ATF) if using 1250V or 1275V helms.

Hose and Tube:

  • Recommend 100R1 for power circuit, 5/16" ID hose or tube for manual circuit. * If using 1/4" ID tube, runs should be short and SeaStar oil must be used.


  • An autopilot designed for use with hydraulic steering may be tied into your SeaStar steering system at any convenient point in the helm lines.
  • Installing shut-off valves in hydraulic lines running from autopilot pump set to steering system lines will simplify trouble shooting and servicing at a later time if necessary.
  • Autopilot selection must be compatible with oil used in your SeaStar steering system.
  • Autopilot power pack shaft seal must be able to withstand 30 psi. Contact Teleflex for compatibility information.

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