The Boating Forum - seastar hyd oil question
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05-28-2009, 09:41 PM
seastar power steering hyd oil at west marine is over $20 a quart,;? does anybody have a alternitve oil by a oil company? the only info on the contianer is a ml506 rateing.
05-28-2009, 09:45 PM
Aviation red fluid, 5606 hydraulic oil. That is what I use and per your manual it is recommended alternate fluid.
05-28-2009, 10:01 PM
where can you buy it
05-28-2009, 10:19 PM
At your local airport maintenance shop, or an aviation supply, like Chief Aircraft or aircraftspruce.com (http://aircraftspruce.com/)
05-28-2009, 10:58 PM
The difference in aviation grade hydraulic fluid and ordinary hydraulic fluid is the flammability. If, like many of us, you are not worried about your steering system suddenly catching fire, please feel free to fill it with any hydraulic oil. "Hydraulic oil" is used in most tractors, jacks and many mechanical devices. "Hydraulic oil" with friction modifiers is transmission fluid. Your boat steering really does not care if it is filled with Dexron, Mercon, tractor fluid or Pep Boy's jack oil. Somehow it has always been perfectly OK to fill you car's steering system with trans fluid. All common hydraulic fluids are compatible with the o-rings in the system, but the continued hazard of the 2 quarts of fluid adding to the conflagration of hundreds of gallons of gasoline will be there unless you buy the $20.00 a quart stuff.:grin:
I personally do not use trans fluid in my boat. Why? Because it is dyed red and can stain the fiberglass. I use Mobil DTE25 hydraulic fluid because it is clear and that's what many of my machines at work are filled with. OH, the same stuff is just fine in the trim tabs as well.
05-29-2009, 03:02 AM
I started topping mine off with ATF no problems yet, my steering piston is slightly pitted in a spot.
One of my hose ends is at a bad angle and starting to kink anyone know if the screw on hydraulic ends will work with the teleflex hose, Instead of the crimp on ones? was going to cut it back a couple inches, got a generous loop in the transom.
05-29-2009, 04:31 AM
Hydraulic fluid is fine - I bought an RV product for $7. Mechanic advised it is fine and they have used it for years.