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Old 22 May 2013, 12:44   #1
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hydraulic steering

Does anyone know the spec of the fluid in hydraulic steering.don't know the make of the unit.are they all the same ? thanks

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Old 22 May 2013, 12:49   #2
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Probably ATF. Dexron II or something like that.

Rock oil MPH is pretty good.
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Old 22 May 2013, 13:01   #3
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Im after the number off the bottle,as my mate has 25 litres of it and want to make sure it the right stuff before i us it

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Old 23 May 2013, 11:26   #4
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Quote:
Originally Posted by simon23 View Post
Does anyone know the spec of the fluid in hydraulic steering.don't know the make of the unit.are they all the same ? thanks

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It's a military grade aircraft hydraulic fluid. The spec it's supposed to meet is MIL-H5606 rev G (the rev suffix may be wrong.) Seastar's fluid is a natural color; most aviation grade stuff will be dyed for leak detection.

From the Seastar manual:

^^^^^^^^^^^^^^
Recommended oils for your steering system are:

Seastar hydraulic fluid, part no. HA-5430 (1 quart), HA-5440 (1 gallon)
Texaco HO15
Shell Aero 4
Esso Univis N15
Chevron Aviation Fluid A
Mobil Aero HFA
Fluids meeting MIL H5606 specifications

Automatic transmission fluid Dextron II may be used in an emergency
[snip]
In cases of extreme emergency, any non-toxic, non-flammable fluid may provide temporary steering.
^^^^^^^^^^^^^^^^^^


Pretty much any hydraulic fluid will work fine; the seastar stuff is a fairly light oil to guarantee ease of handling. Heavier oils may make the steering a little heavier (though probably not much.)

I bought a gallon of Shell aviation hydraulic fluid for about the same price as a quart of Seastar fluid. A complete fluid replacement on my boat used maybe a third of the gallon.


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Old 23 May 2013, 14:56   #5
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Jky, thats excellent information


Thanks simon
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Old 24 May 2013, 00:36   #6
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Glad to help.

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