Inboard Power Steering

INTRODUCTION

Steering today’s high horse power luxury yachts and commercial boats all too often challenges the helmsman’s physical endurance and cruising enjoyment.

The SeaStar Power Steering System was designed specifically to meet this challenge, representing the ultimate in comfort, simplicity, safety and reliability. Superior design and selection of materials, precision manufacturing and rigid quality control all add up to an outstanding rugged product, continuing the SeaStar tradition.

The SeaStar open center Power Steering system has been designed to steer commercial and pleasure boats, requiring a maximum output force of 10,308 lbsf or 45,852 Newtons, or a maximum torque of 66,130 in-lbs or 7,472 Newton meters. If uncertain of your application, or you have special requirements, refer to the SeaStar power steering brochure or consult the factory.

All power steering system components have been designed to the highest standards possible. Please ensure that components not purchased from SeaStar Solutions® are of the highest quality possible, and are compatible with SeaStar Solutions® equipment.

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System Components
How it Works
Power Steering Cylinder
Selection Guide
Basic System Selection Information
Fluid / Oil
Hose and Tube
Autopilot

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SYSTEM COMPONENTS

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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.

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POWER STEERING CYLINDER

Features

• 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

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SELECTION GUIDE

CYLINDER PART NO. DISPLACEMENT HULLS PLANNING HULLS
(STANDARD) (HEAVY DUTY)
Single 9″ x 1 Cylinder HC5801-2 Up to……50′ (15m) Up to……40′ (12m) Up to……65′ (20m)
Twin 9″ x 2 Cylinder HC5802 Up to……75′ (23m) Up to……55′ (17m) Up to……85′ (26m)
Single 11″ x 1 Cylinder HC5803-2 Up to……60′ (18m) Up to……50′ (15m) Up to……75′ (23m)
Twin 11″ x 2 Cylinder HC5804 Up to……85′ (26m) Up to……60′ (18m) Up to……100′ (31m)
*Single 9″ x 2.5 Cylinder HC5805 Up to……100′ (31m) Up to……70′ (22m) Up to……110′ (34m)
*Twin 9 ” x 2.5 Cylinder HC5806 Up to……110′ (34m) Up to……80′ (25m) Up to……120′ (37m)

All* Larger 2.5″ cylinder bore than HC5801-2 and HC5802

All boats over 70′ should have steering loads reviewed by factory.

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BASIC SYSTEM SELECTION INFORMATION

POWER STEERING CYLINDERS PART NO.
Single 9″ x 1 Cylinder HC5801
Twin 9″ x 2 Cylinder HC5802
Single 11″ x 1 Cylinder HC5803
Twin 11″ x 2 Cylinder HC5804
Single 9 ” x 1 Cylinder, 2.5″ Bore HC5805
Twin 9 ” x 2 Cylinder, 2.5″ Bore HC5806
HELMS (FOR 3-1/2 TURN SYSTEM PART NO.
SSI Helm, Standard Mount HH5271
SSI Helm, Rear Mount HH5261
SSI Helm, Tilt HH5741
SSI Helm, Rear Mount, 1″ Straight Shaft HH5279
SSI Helm, Rear Mount, 1″ Shaft HH5281
POWER STEERING PUMPS PART NO.
Outlet Check Power Pump HP5820
Press Relief Twin Pump HP5822
Belt Drive, Right Rotation (Universal) HP5830
Belt Drive, Left Rotation (Universal HP5831
Direct Drive, Right Rotation (for Detroit Diesel) HP5832
Direct Drive, Right Rotation (for Caterpillar – special order) HP5833
Direct Drive, Right Rotation (Spline) HP5833
Direct Drive, Right Rotation (2 GPM) HP5834
Direct Drive, (for Twin Disk) HP5835
Direct Drive, Right Rotation (No Flow Control) HP5836
Direct Drive, Right Rotation (4 GPM) (9 Tooth Spline) HP5837
Direct Drive, Right Rotation (2 GPM) (11 Tooth Spline) HP5838
Direct Drive, Right Rotation (2GPM) (9 tooth spline) HP5839
Direct Drive, Left Rotation, (2GPM) (11 tooth spline) HP5840
Direct Drive, Left Rotation, (4GPM) (keyed shaft) HP5841
Direct Drive, Left Rotation, (4GPM) (11 tooth spline) HP5842
Direct Drive, Left Rotation, (4GPM) (9 tooth spline) HP5843
Direct Drive, Right Rotation, (2GPM) (6 tooth spline) HP5844
Direct Drive, Left Rotation, (6GPM) (9 tooth spline) HP5845
Direct Drive, Right rotation, (6GPM) (9tooth spline) HP5846
Direct Drive, Right rotation, (6GPM) (11 tooth spline) HP5847
Direct Drive, Right rotation, (6GPM) (keyed shaft) HP5848
Direct Drive, Left rotation, (6GPM) (11 tooth spline) HP5849
Direct Drive, Left rotation, (6GPM) (keyed shaft) HP5850
Direct Drive, left rotation, (6GPM) (13 tooth spline) HP5852
OIL RESERVOIR, COOLER AND FILTER PART NO.
Oil Reservoir HP5810
Oil Cooler, 2.25 kW, 1″ water lines HP5825
Oil Cooler, 6.25 kW, 2″ water lines HP5826
Oil Filter HP5815
OIL RESERVOIR, COOLER AND FILTER PART NO.
Outlet Check Valve (Power Pump) HP5820
Auto Flow Control (Twin Pump) HP5821
Crossover Pressure Relief HP5822
System Pressure Gauge Kit HA5821
Adapter Kit, Twin Disk #5050 HA5823
Adapter Kit, Twin Disk #5061 HA5824
Adapter Kit, V10 to MAN V-Type Engine HA5827
Adapter Kit, V20 Pump to ZF Gear HA5828
SeaStar Oil , 1 liter HA5430
SeaStar Oil , 4 liter HA5440
Pressure Relief Valve (Require when using a power pump without a built in pressure relief. ALL SeaStar power pumps will NOT require this valve.) HP5818

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FLUID / OIL

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

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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.

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AUTOPILOT

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 SeaStar Solutions® for compatibility information.

Refer to Autopilot section of web site for additional information.

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