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Tractor Talk Discussion Forum

viscosity

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buuger

08-12-2005 16:29:45




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Is all hydraulic oil the same viscosity or can I get different grades. I would like to try thicker oil to stop loader chatter.




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buickanddeere

08-15-2005 05:55:43




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 had me worried Re: viscosity in reply to buuger, 08-12-2005 16:29:45  
You had me worried. At first I thought you were asking about a vasectomy



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Jay (ND)

08-12-2005 18:16:52




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 Re: viscosity in reply to buuger, 08-12-2005 16:29:45  
Correct me if I'm wrong, but I don't believe viscosity has anything to do with chatter unless you are only looking at bargain priced oil. Most professional (not wally world oil) oils have anti-chatter characteristics.



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Vern-MI

08-13-2005 04:26:38




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 Re: viscosity in reply to Jay (ND), 08-12-2005 18:16:52  
Mobil has an additive which reduces the static coefficient of friction below the dynamic coefficient of friction and thereby reduces or prevents the slip - stick characteristic of the cheaper oils. It is the same kind of mouse milk that they use in positraction rear ends to prevent the friction plates from grabbing and releasing or slipping and sticking. They also use it in automatic tranmission fluid to prevent converter clutch shuddder which is a result of the slip and stick action. I don't know what is in the additive but the dealers use to carry small bottles of the stuff to add when the stick slip phenomenon occured

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txgrn

08-12-2005 21:15:14




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 Re: viscosity in reply to Jay (ND), 08-12-2005 18:16:52  
And why doesn't Wally's oil have that too as it is mfgr'd by major mfgrs. Why would they exempt additives from their oil? Makes no sense.

I use WW oil all the time and have no gripes. Was looking at a container of house brand 15w-40 engine oil last week and found exactly the same specs listed, in the same order, on the back as was on a container of Chevron Delo. Hmmmmm m.

Now to the answer to the question.

The trans/hydraulic fluid, common today, is slightly higher in viscosity than straight hyd. I read that somewhere but can't quote the source. I think reg hyd is 10 to 15 w and trans goes to 20w.....somewhere in that area.

But as mentioned, get on www and look up specs in the sites of major oil co's and you should get your answer.

My 2c

Mark

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Way Up Here

08-13-2005 04:45:40




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 Re: viscosity in reply to txgrn, 08-12-2005 21:15:14  
I'll agree with you on the Wally Oil, it's funny how many of us get it stuck in our heads that something at a better price just HAS to be cheap. Years ago, I read a study on noname vs national brands of oil used in New York taxi cab fleets. The end result of the study that there was no signifigant difference in engine wear etc. between the types tested, and that study was published in an automotive journal.

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Jay (ND)

08-13-2005 04:14:33




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 Re: viscosity in reply to txgrn, 08-12-2005 21:15:14  
Just because it meets the same specs doesn't make it the same quality. Not always when you buy a $10 hat will you get a $10 hat, but always, when you buy a $3 hat you will get a $3 hat.



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Midwest redneck

08-12-2005 17:46:55




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 Re: viscosity in reply to buuger, 08-12-2005 16:29:45  
hydraulic oil has all different grades if you want, 20W-50 is thicker than say 10W-30 I used to know all the info on oils but I am getting older, if you go on the net and look up viscosity specs for Mobil oil and penzoil and so on it should give you info with graphs of viscostiy at temp.



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Oliver Power

08-13-2005 06:56:10




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 Re: viscosity in reply to Midwest redneck, 08-12-2005 17:46:55  
A few years back , I read a book on hydraulics. Your right , you can buy hydraulic "OIL" in different viscosities. But , hydraulic "FLUID" is all 10W with additives for hydraulic system. According to the book , it is all motor oil. The difference is; once the additives are added for hydraulic systems , the name is changed from oil to fluid. And it is always 10W oil that is used.



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Jay (ND)

08-13-2005 10:20:51




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 Re: viscosity in reply to Oliver Power, 08-13-2005 06:56:10  
Yes - that's correct. And while most hydraulic fluids will be a multi-weight, they all start out as 10w and are additived to make them 10w30, etc. Simply put, the additive which makes them a multi-weight is like a curly noodle. When the oil is cold it's like the noodle is dry, and the additive doesn't expand/take up much room. As the oil warms up, it's like the noodle when done, it takes up more room, makes the oil thicker, thus changing the viscosity. But also because of this property, the additive will shear, or eventually break down and eventually, if ran long enough, turn it back into 10w even when warm. No one runs there oil this long, but hypothetically this is what would happen if you did.

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