Although exploded diagrams aren't public, official seal kits are available through authorized dealers:
Deep inside the cast aluminum housing lies the mechanical heart of the hydraulic steering system. These internal components dictate fluid direction and pressure regulation. The Piston Pump Block Seastar Hh5271 Parts Diagram
If you are not comfortable with this process, specialized marine services can rebuild the helm for you. Although exploded diagrams aren't public, official seal kits
If air enters the hydraulic system, steering will feel spongy or unresponsive. While the official SeaStar manual describes a two‑person process involving bleeder screws, many experienced boaters have discovered a simpler method: Although exploded diagrams aren't public