Types of Hyd oil

Amo in nebraska · Jan 4, 2009

Was reading a topic somewhere else about hyd oil, and had a question for an independent place. They said that Hy-tran was designed to addsorbe water from condensation while a genaric HTB or transdrolic or what deere makes is designed to repell it.

Im not saying that its not ture. My question is why one way or the other. Personally I can see where oil that would adsorbe water would be excellent, but then why wouldnt they all do that? Also why would deere repell it and how can it adsorbe or repell? Also how much does it adsorbe?

Not bashing colors or saying it dont do what they claim, just wondering why and how I guess.

Thanks
ltr

Gun guru · Jan 4, 2009

The only way I can think that oil can "absorb" water is to have the oil heat up to 212F and the water vaporizes into the oil. I was told that in automatic transmissions that the fluid gets to 250f regularly, the small amount of condensation will sort of boil off into steam and mix into the oil. I would think that all oil repels water, cause oil and water dont mix right.
I used to have a farmall H. I changed out the trans fluid, the fluid was milky brown. The fluid may have had a quart of water in it from the 40 years since the last change. I doubt gear transmissions in tractors get over 150f. As far as hydrostatic transmissions in tractors dont know for sure but they could get up to the boiling point in the summer. (I should look that up)

Amo in nebraska · Jan 4, 2009

Ya I think a hydro could get pretty toasty. They also said that hytran was 10W and it would flow better in colder weather through filter.

Ya oil and water dont mix...thats for sure.

Jon Hagen · Jan 4, 2009

Many engine and hydraulic oils have a water dispersant additive which will absorb the water and circulate it with the oil. This is working on the theory that if the oil gets hot enough in operation, it will "boil off" the water. This also keeps water from pooling at the bottom of the tank/pan and freezing up intake screens or pumps. Once there is so much water in the system so the water dispersant is totally saturated with water, then you again will get water pooling in the bottom.

Two different ways of thinking, do you circulate water in the fluid and hope it boils off before getting in places where it can cause corrosion, or do you try to keep it pooled in the bottom of the sump and hope it never gets deep enough to clog/freeze anything. Either way, that is why oil changes are recommended on months in place as much as hours of running time.

Spook · Jan 4, 2009

Some oils are hyrdoscopic, they will absorb water. So when the oil gets hot, some water will bake off. As far as oil and water not mixing, what about the old white coolant oil that machinists have been using for 100 years? The hydraulics on my 300U gets very hot. I doubht it is 200F, but it is pretty hot.

John B. · Jan 4, 2009

Was the machinist coolant also a lubricant?

I don't know for use my self but I was told by many machinists that they put small amount of the coolant into the radiator of their automobiles to keep the water pump from wearing out.

Don't know if it actaully worked but I guess they believe it did.

Gun guru · Jan 4, 2009

Yes. There are fluids like, Emulsions that are oil water combos. I have only ever used this once for coolant on a lathe. It worked well but I like pure dark oil for threading, cutting, turning. (smells rough too, but who cares.)

Jon Hagen · Jan 4, 2009

I used to be able to buy "waterpump lubricant" locally. It was a water solible oil to be mixed with water to lube the water pump seal. I believe it also had some anti corrosion additives in it. When mixed with water it would create that slimey yellow white goop like machinest cooling oil. My old Souix valve grinder uses it to cool the valve face as you grind it.

Dean Barker · Jan 4, 2009

Hy-tran has an emulsifyer that hides the water so you can't see it. The water is still there and still does it's damage to the oil. Only part of the water will boil out of the oil. Oil that does not have the emulsifyer does not really repel water; it doesn't mix with the oil.
If you see milky oil, you have about 10% water or more. We elected to leave the emulsifyer out of the White hydraulic oil, so the water in the oil could be seen and thus drained out and replaced. With the Hy-tran, you can't see the water so you have no way of knowing it is there.

Types of Hyd oil

Amo in nebraska

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Gun guru

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Amo in nebraska

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Jon Hagen

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Spook

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John B.

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Gun guru

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Jon Hagen

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Dean Barker

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