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Recycling Hydraulic oil with water in it..(Tutoria
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Posted by JayWalt on September 19, 2006 at 21:32:34 from (24.223.138.48):
Well guys, if you got water in your hydraulic oil (which I do since its a cream color), and you're too cheap (like me) to spend $60-$80 on new oil, then here's a tutorial to clean your oil. I know its best to use fresh oil, but I'm too cheap. The end result was more then satisfactory. First drain the oil into 1 gallon milk jugs and let it set for an hour or more. The water will not separate. From what I've been told, there are additives to suspend the water so it doesnt separate and cause corrosion. However, there may be a "soap" that settles to the bottom. Not sure why this happens, but it does and doesnt seem to be very abnormal for oil in this condition.
This was the end of a jug after syphoning. Now you need to syphon yours. Syphoning wont be easy since oil is alot more viscous then water or gas. Luckily I had this old oil changer pump (pretty much a joke for its real application) laying around and decided to use that. works great, a little slow but alot faster then syphoning. Leave as much oil in the bottom as there is "soap" to help prevent sucking any soap into the other container.
Now here is where we boil the water out of the oil. The key here is to not burn the oil. I used a single element portable stove and did it in the garage which has decent ventilation. Don't do this inside, unless u like the smell of cooking hydraulic oil!! Turn the burner on about 1/3 of the way and wait for it to get hot. Then slowly increase the temp until you see bubbles. A thermometer comes in handy about now. I used a candy thermometer and kept the oil below 250 F. If you get it to hot it will burn the oil and make the whole process pointless. Boil the oil until it becomes clearer and the bubbles stop. This process takes a while, so its kinda nice to have other stuff to work on.
Now is the best time to filter the oil, when its hot, so it's thinner and takes less time to filter. I used 2 coffee filters to filter out any sediments.
Here is the final product. It is a little dark, but not bad. It seems to be the right vicosity. I'm sure its better then leaving it in the way it was.
I did all of this with a fairly small boiling pan, so that is why the jug isnt very full. It would be alot easier with a largr pot, but I dont have anything else that I dont eat out of =)
Now I'm sure alot of you will say this is stupid, just buy new oil. But not only am I saving money, I'm saving having to dispose of the old oil. This is far from a restored tractor, if it was, It'd have all new fluids in it =) and a big hole in my wallet and tears in my eyes =)
Hope this helps someone, and if it doesnt, I still had fun doing it and posting this =)
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