Posted by Hal--WA on January 11, 2009 at 22:24:33 from (208.81.157.90):
In Reply to: Drying hydraulic oil posted by Bret4207 on January 11, 2009 at 16:21:26:
If a machine sits outside all the time, there is no way to completely prevent water getting into the various oil sumps. And I doubt that you can ever get 100% of it out by draining and flushing. So I would suggest running the tractor for a while until it is good and warm, using the hydraulic system so that the oil gets very well mixed up and warm. Then try to drain out as much as you can and refilling the system with new hydraulic oil. If you still have problems with the system cold after that, I would bet there is something else wrong.
Others my disagree, but I reuse water contaminated hydraulic oil. After it has sat undisturbed in a 5 gallon pail for months, the water mostly settles to the bottom. I then pour off most of the oil above the water, into a clean 5 gallon container. That oil looks as clean as brand new oil and seems to work fine in my machinery.
An easy way to find out if your oil has water in it is to drop a small amount of it on a hot exhaust manifold. If it just smokes, the oil doesn't have much water in it. If it immediately sizzles and pops around, that is caused by the water in the oil boiling. If it sizzles, there is water in the oil and it should be replaced.
I don't know how a DB is built, and if it has separate sumps on the transmission, hydraulic area and rear end. But the older Fords are built that way. I had some trouble with water in my hydraulic sump, and wondered where it was coming from, since new oil would be contaminated within a couple of weeks. I decided to change the rear end oil too. When I removed the drain plug on the rear end, about 2 quarts of water came out before I ever started draining any 90W gear lube. With new oil in the transmission, hydraulic sump and rear end, my hydraulic oil quit becoming contaminated so quickly. I wouldn't have believed it if I hadn't seen it myself. I didn't try to salvage the used gear lube--it really looked bad. And I had changed the rear end lube about 5 years earlier. I hope to get my tractors under cover within the next couple of years. Good luck!
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