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 hydraulic steering - loss of hydraulic fluid

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T O P I C    R E V I E W
RBD Posted - Feb 17 2017 : 17:04:13
We have a 2002 Carver 350 Mariner with the SeaStar hydraulic steering system and loose about 1/2 ounce of fluid over a 6-7 week period. Cannot see any leakage around the helm pump connections or at the cylinder connections. Seems to leak that small amount and then stops, fortunately never loose steering.
Where could the leak be located that it does not drain the entire system ? This is a flybridge helm and the wheel is the highest point of the steering system.
Does anyone know how the hydraulic lines are run from the helm down to the cylinder ?
Should I consider running new lines ? Is it even possible ?

thanks for any suggestions


8   L A T E S T    R E P L I E S    (Newest First)
Audrey II Posted - Feb 23 2017 : 07:53:27
Are you sure you aren't over filling it and it is pushing out the pressure release/overflow valve?
You need to make sure you follow the direction to fill and bleed the system. If the ram is in the wrong position when you fill it then there won't be room for the fluid when you turn the wheel the other way. I only know this from experience.
RBD Posted - Feb 22 2017 : 15:13:07
Timeout I will follow your suggestion and bleed the system per the manuals instructions.
You could be right. I did see air bubbles in the clear fill tube and I thought since they rose to the highest point of the system , that the both lines were free of air. Perhaps that conclusion was incorrect and I still had some air somewhere
We are leaving for Florida next Tuesday and will have to wait until we return in Mid April to perform the proper purge procedure

timeout Posted - Feb 21 2017 : 17:14:06
Have you ever properly bled the system? I wonder if every time you open the cap, you find a "half ounce" of air that has risen to the top of the system. You replace that half ounce with fluid, and the process starts over again. It's like bleeding the system a little at a time. Another possibility is, if you have a pressurized system, the air reservoir is leaking and dropping the pressure, coupled with air in the line.
RBD Posted - Feb 21 2017 : 14:18:54
Looked for seepage at rod, nothing there or in the bilge . Would hydraulic evaporate?
The system leaks about 1/2 ounce and then stops loosing fluid. Holds at that level and continues to work adequately
jtybt15 Posted - Feb 19 2017 : 19:37:56
Did a 'repair' on a similar set up though not fly bridge. Replaced the seals on the ram and never got a call back. Never found the actual cause. Was wondering if water/wave movement against the rudder was enuff to move the ram.
pdecat Posted - Feb 18 2017 : 13:16:20
Probably only leaks under pressure when turning the wheel or shaft movement. A leak in a hose middle would be surprising without
Some sort of abrasions
RBD Posted - Feb 18 2017 : 10:17:16
Good morning Bruce I will check that out, but if it is leaking there, since it is the lowest point of the system, would it not drain all of the hydraulic fluid over time?
pdecat Posted - Feb 17 2017 : 19:00:49
Look where the rod exits the cylinder

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