Dometic Seastar Hydraulic Steering Ordering Guide for Inboard Engines
To properly select a Seastar hydraulic steering system for your inboard engine, please use the following steps:
1. Using the cylinder flow chart below, determine the steps required.
2. If applicable gather the information needed to complete a torque rudder sheet or consult your naval architect.
3. Confirm that you have sufficient space available in:
a) the area the cylinder is to be mounted in;
b) the dash area for all steering components.
Inboard Cylinder Selection Flowchart
Seastar Inboard Cylinders Specifications
| Sku # | Model # | Bore Diameter in (mm) |
Shaft Diameter in (mm) |
Stroke in (mm) |
Seal Kit |
Torque |
Volume cu. in. (cc) |
| HC1503-3 | BA150-3ATM | 1.50 (38.1) | .63 (16.0) | 3 (76) | HP6025 | 7177 (82.0) | 4.37 (71.6) |
| HC5303-3 | BA125-3ATM | 1.25 (31.7) | .63 (16.0) | 3 (76) | HP6026 | N/A | 3.12 (51) |
| HC5312-3 | BA125-7ATM | 1.25 (31.7) | .63 (16.0) | 7 (178) | HP6026 | 5025 (57.9) | 7.2 (118) |
| HC5313-3 | BA135-7ATM | 1.35 (34.9) | .63 (16.0) | 7 (178) | HP6025 | 5741 (66.1) | 8.3 (136) |
| HC5314-3 | BA150-7TM | 1.50 (38.1) | .63 (16.0) | 7 (178) | HP6025 | 7117 (82.0) | 10.2 (167) |
| HC5319-3 | BA175-7ATM | 1.75 (44.4) | .75 (19.1) | 7 (178) | HP6071 | 12600 (145.5) | 13.7 (225) |
| HC5326-3 | BA150-7EM | 1.50 (38.1) | .63 (16.0) | 7 (178) | HP6086 | 8853 (102.0) | 8.3 (136) |
| HC5328-3 | 125-8EM | 1.25 (31.7) | .50 (12.7) | 8 (203) | HP6087 | 7142 (82.3) | 8.3 (136) |
| HC5329-3 | 125-8VPEM | 1.25 (31.7) | .50 (12.7) | 8 (203) | HP6027 | N/A | 8.3 (136) |
| HC5330-3 | BA125-8EMV | 1.25 (31.7) | .50 (12.7) | 8 (203) | HP6027 | 7142 (82.3) | 8.3 (136) |
| HC5331-3 | 125-8EM 92VPS | 1.25 (31.7) | .50 (12.7) | 8 (203) | HP6027 | N/A | 8.3 (136) |
| HC5339-3 | 125-6.5EM | 1.25 (31.7) | .50 (12.7) | 6.5 (165) | N/A | N/A | 6.25 (102.4) |
| HC5373-3 | BA 175-9TM | 1.75 (44.4) | .75 (19.1) | 9 (229) | HP6071 | 12600 (145.5) | 17.7 (290.0) |
| HC5386-3 | 150-7EM | 1.50 (38.1) | .625 (15.9) | 7 (178) | N/A | N/A | 10.2 (167) |
BayStar Helm Pumps Quick Reference Turns Chart
| Good | Optimal | ||
| Baystar Helm Displacement (in3/rev) | |||
| Outboard Cylinders | Displacement (in3) | 1.1 | 1.4 |
| HC4645-3 – Single | 7.17 | 6.6 | 5.2 |
| Inboard Cylinders | Displacement (in3) | ||
| BA125-6.25 | 6.7 | 6.1 | 4.8 |
| BA100-6 | 3.53 | 3.2 | 2.5 |
WARNING! SAIL BOATS
Dometic’s expected rudder torque calculations are not suitable for sail boat applications. Please contact a naval architect for loads to determine expected maximum torque about rudder post.
NOTICE!
Please include a detailed dimensioned rudder drawing including the location of the rudder post. This must be provided to get a steering system recommendation.
Sorry, is not an active item in our system. However, we may still be able to help you. Please email us at rajeshk@klizer.com or call us at (866)388-0390 for assistance. Please make sure to have the item number handy when you contact us.
