Dometic always recommends a mechanical tie bar between rudders where possible. In applications where a mechanical tie bar cannot be fitted, it is recommended that you use a “liquid tie bar valve”. This valve will serve two purposes; assisting with the air removal from the system and allows the user to re-align the rudders when they come out of sync. Regardless of the application, a mechanical, or, liquid tie bar must be fitted. Due to the potential of leakage across the piston seals, use of standard SeaStar inboard cylinders may require frequent engine realignment. If you must use a “liquid tie bar”, Dometic recommends that you order the following parts below. Doing so will decrease the amount of re-alignment required. 4.3 SeaStar catamaran inboard series
4.3.1 Steering cylinders
HA5471-2, Liquid tie bar valve This valve assists with air removal and re-alignment of the rudders when required without having to break into the hydraulic system. HC5319-3 Catamaran steering cylinders The HC5319-3 has the same properties as the HC5319 inboard cylinder but the internal piston seals are different. This difference will decrease the amount of rudder re-alignment that you would encounter. SeaStar PRO helm Use of a SeaStar PRO helm coupled with the inboard steering cylinders will drastically reduce the amount of rudder realignment that you may encounter. For other applications please call Dometic technical service at 604-248-3858. SeaStar PRO hose (Kevlar) To further reduce engine misalignment, and increase system performance, Dometic recommends the use of SeaStar PRO steering hoses.
Figure 4-7. Liquid tie bar valve HA5471-2.
NOTICE! Bleeding of a “liquid tie bar system” is different than a system fitted with a mechanical tie bar. Please refer to your installation and owner’s manual that is shipped with the liquid tie bar valve. NOTICE! In high horsepower applications Dometic recommends using Optimus. SeaStar power assist is also a good option to reduce steering effort.
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