Dometic Seastar
SeaStar HC5314-3 Inboard BA150-7ATM Hydraulic Boat Steering Cylinder
- SKU:
- HC5314-3
- Condition:
- New
Description
SeaStar HC5314-3 Inboard BA150-7ATM Hydraulic Boat Steering Cylinder
The Dometic HC5314-3 SeaStar inboard hydraulic steering cylinder is the BA150-7ATM model used on many single and dual rudder inboard vessels that require smooth steering and mid range rudder torque capacity. It is part of the SeaStar inboard cylinder family and is sized to deliver approximately 10.2 cubic inches of output over a 7 inch stroke for responsive, predictable helm control when paired with a SeaStar inboard helm.
Designed for pleasure and light commercial boats, the HC5314-3 works in 2 line SeaStar inboard hydraulic systems with compatible helms and autopilot pumps. Two axis articulation at the rod end makes it easier to align to the tiller arm or tie bar, and provides a clean location for autopilot tee in fittings when required. When installed per SeaStar instructions and the hydraulic steering selection guide, it offers a reliable, low friction steering solution for many inboard powered boats.
Key Benefits of the HC5314-3 Cylinder
- BA150-7ATM mid range inboard cylinder sized for many single and dual rudder inboard steering systems.
- 7 inch stroke and 10.2 cu in volume for a good balance between helm effort and rudder response in typical applications.
- Two axis articulation at the rod end to help maintain proper geometry between cylinder, tiller arm, and tie bar.
- ORB style hose ports on the -3 cylinders allow use of positionable ORB fittings for cleaner hose routing and easier service.
- Marine grade aluminum construction with stainless fasteners for corrosion resistance in normal duty service.
- Compatible with many SeaStar inboard helms and autopilot pumps when sized per the SeaStar inboard selection guide.
Technical Specifications
Recommended Applications
Important: Always verify cylinder sizing using the current SeaStar inboard hydraulic steering selection guide and confirm rudder torque, helm displacement, and number of steering stations before ordering. For help reviewing your setup, please use our Tech Support Page and include your vessel details.
Spare Parts and Accessories for HC5314-3
These are common service and accessory parts used with many SeaStar BA150-7ATM inboard cylinders. HC5314-3 typically uses a gland/O-ring kit (HP6025) for rod-end service and a full seal kit (HS5156) when a complete reseal is needed. Always confirm stampings on your cylinder and review the parts breakdown before ordering.
Need help choosing between HP6025 and HS5156? Please use our Tech Support Page and include the cylinder part number stamped on the barrel, close-up photos of the ports and rod end, and any symptoms you are seeing.
Downloads and Resources
Installation Tips
- Verify that HC5314-3 and the BA150-7ATM mounting dimensions match your existing cylinder footprint and tiller arm geometry before drilling or modifying brackets.
- Follow the SeaStar inboard cylinder mounting dimensions to maintain proper push and pull angles between cylinder, tiller arm, and tie bar.
- Use only SeaStar approved ORB hose fittings and hydraulic steering hose rated for SeaStar inboard systems.
- Route hoses to avoid chafe, kinks, tight bends, and heat sources. Leave enough slack for full rudder travel and any engine or shaft movement.
- Bleed the system thoroughly following SeaStar procedures until steering feels solid from hard over to hard over with no visible aeration in the fluid.
- After installation, swing the rudder or rudders through full travel to confirm there is no interference and that the cylinder does not bottom out on internal stops before the rudder stops.
Maintenance Guidelines
- Periodically inspect the cylinder rod for damage, pitting, or corrosion and address any issues before they affect seal life.
- Check for seepage around the end gland and hose fittings. Small weeps can be an early sign that a seal kit or gland kit will be needed.
- Keep the cylinder and surrounding hardware clean and free of salt buildup. Rinse with fresh water after use where practical.
- Maintain the helm fluid level with genuine SeaStar hydraulic steering fluid. Do not mix other hydraulic oils or ATF.
- If steering feel changes, becomes spongy, or develops excessive free play, schedule an inspection for air in the system, low fluid, or worn components.
FAQ
Is the HC5314-3 the right cylinder for my boat?
Possibly. HC5314-3 is one of several SeaStar inboard cylinders and is typically used on mid sized inboard vessels that fall within a specific rudder torque and length range. The correct way to confirm is to use the SeaStar inboard hydraulic steering selection guide along with your vessel length, hull type, rudder torque, and number of stations, or submit your details through our Tech Support Page.
Can HC5314-3 replace a different SeaStar or Capilano inboard cylinder?
In some cases HC5314-3 can be used as a replacement for other SeaStar or Capilano inboard cylinders, but only when the stroke, volume, rudder torque rating, and mounting dimensions are verified. If you are replacing an older cylinder, share the original part number and clear photos of the existing installation via our Tech Support Page and we can advise whether HC5314-3 is an appropriate substitute.
Which seal or gland kit do I need for my HC5314-3 cylinder?
Most BA150-7ATM cylinders with -3 style ORB ports like HC5314-3 will use the HP6025 gland/O-ring kit for rod-end leaks. When doing a complete reseal of the BA150-7ATM cylinder, the HS5156 full seal kit is commonly used. If you are unsure, upload photos of the cylinder stamping and rod end through our Tech Support Page and we can confirm the correct kit.
Can I rebuild my HC5314-3 cylinder myself?
Many mechanically inclined owners can rebuild a SeaStar inboard cylinder using the correct seal or gland kit and the HS5300 cylinder service tool kit, following SeaStar service instructions. However, if the rod is pitted, the bore is damaged, or you would prefer not to take it apart, our SeaStar cylinder rebuild service is often the best option. If you are unsure which route is best, send photos of the cylinder and rod via our Tech Support Page.
Is this cylinder compatible with power assist or autopilot systems?
Yes, SeaStar inboard cylinders are used in many systems with SeaStar power assist and autopilot pumps when plumbed according to Dometic instructions. Autopilot tee in fittings and check valves must be plumbed correctly and the steering system must be fully bled. For a quick review of your helm, cylinder, and autopilot pump model, send photos and part numbers through our Tech Support Page.
How do I know if my existing HC5314-3 needs a rebuild or replacement?
Signs that a rebuild may be needed include fluid seepage at the gland, increased free play, or a spongy steering feel. If the rod is straight and free of deep pitting, a seal or gland kit and proper service may restore the cylinder. If the rod is badly pitted or bent, or the body is damaged, replacement may be the safer option. For a recommendation specific to your cylinder, upload clear photos via our Tech Support Page.
Questions?
- Tech Support: Tech Support Page
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- Request a Steering System Quote: Request Quote Page
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Warranty Information
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