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Old 01-03-2022, 11:03 AM   #21
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City: Vancouver
Vessel Name: Callisto
Vessel Model: 1974 Grand Banks 42 Classic, Hull 433
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It is possible that there was no oil leak, but simply a loss of air pressure.

Without the air pressure the pump at the top of the system (the upper helm pump) might pull a vacuum instead of pulling oil into its chambers. I believe that this is why some of these systems apply an air pressure cushion over the oil.

Have you ever tried to fill a medical syringe and seen how easy it is to pull a vacuum?

Just a thought,
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Old 01-03-2022, 11:58 AM   #22
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City: MX, thru Canal to Bahamas
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Most boats with hydraulic steering, and upper and lower stations manifest the problems in the upper station first, because of, well, gravity. The leak reduces the oil available to the entire system, and the air migrates up, oil stays down, (for the most part) so it's usually the upper station that has problems first, as demonstrated by several posters above. Doesn't necessarily mean that the upper station is where the leak is though. That's the point of my long winded post. A leak lower down will almost always manifest itself at the upper station first!
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