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Old 07-06-2016, 12:24 PM   #1
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City: Norfolk
Country: VA
Vessel Model: 48' duck
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Foaming hydaulic system

I changed my hydraulic oil last week. I moved the return line to the waist oil tank and ran one item at a time using the 24 volt pump till the oil ran clean from each item. Than i fired up the power pack and ran it till the fluid ran clean using the wing motor.

I never let the fluid get below a quarter of a tank except when i used the drain valve to remove the old oil from the tank.

After the change I went back out to sea and ran the wing motor for 30 minutes, i have ran the bow thruster in each direction for a few minutes, ran the high output bildge pump for 3 minutes (did not want to over heat with no water flow), ran the winch back and forth a few times, and ran the windless in both directions for a few minutes.

I'm still getting some foaming in the tank. I changed the oil because the last test sample came back that i had some water contamination and the viscosity was low. I will send in a new sample next time i get to port to be tested. I don't think there is a leak as the fluid level has not changed and there is no oil film in the bildges.

Anyone have any ideas?

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Old 07-06-2016, 01:34 PM   #2
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City: Cape Cod, MA
Country: USA
Vessel Name: Island Seeker
Vessel Model: Willard 36 Sedan
Join Date: Oct 2007
Posts: 861
You may want to check the specs on your replacement oil to be sure it has anti-foam additive. If it doesn't, maybe it's "spindle oil", if it has the proper R&O additive, then the anti-foam additive can be added.
Foaming would normally be caused by a suction leak.

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Old 07-07-2016, 06:21 AM   #3
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City: Norfolk
Country: VA
Vessel Model: 48' duck
Join Date: Aug 2015
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You got about as close as anyone could get. The auto past store that we ordered from gave us half hydraulic oil and half spindle oil. I will say it's our fault not checking all the labels as close as we should of. I was looking at the labels and they are close if you don't read each one.
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