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Tractor Talk Discussion Forum

Oil versus Fluid

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bent1

02-16-2007 08:04:21




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I have hydraulic fluid in my 1948 hough loader, my 3 point back hoe, and 3 tractor hydraulic systems. I have automatic transmission fluid in my 70s model skidloader and my dump trailer hydraulics systems. Now my mitsubishi dozer calls for 10w motor oil for the hydraulics. Can anyone explain why I can't use regular hydraulic fluid in all of my hydraulic systems?




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bent1

02-17-2007 05:38:48




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 Re: Oil versus Fluid in reply to bent1, 02-16-2007 08:04:21  
Great information. Thanks for sharing. Bent



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Shovelman

02-16-2007 12:09:26




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 Re: Oil versus Fluid in reply to bent1, 02-16-2007 08:04:21  
I would use a Universal Tractor Fluid (UTF). It should cover all the bases except any compartment that has wet brakes or clutch packs. In those I would use an approved fluid that has LS (limited slip) additive packages.

Years ago, I managed a good sized fleet of primarily Cat, Deere and Mack equipment. Of course, every manufacturer had a different hydraulic oil recommendation and it was driving us crazy trying to keep it all straight. After much research, we opted on UTF for over 90% of our hydraulic applications.

It was a good test case since we were on a Scheduled Oil Analysis program and could montitor our results. We found that we were able to dramatically extend our drain intervals with UTF, with no adverse results. We had shovels with over 20,000 hours still running with the original pumps and the lab reports were still coming back clean.

UTF is a little more money, but when you figure in the aggravation factor of stocking many different oils, it is well worth the extra cost.

Scott

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dej(JED)

02-16-2007 11:50:33




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 Re: Oil versus Fluid in reply to bent1, 02-16-2007 08:04:21  
You probably can use one type in all 3. The system I would be concerned about is the one that uses trany fluid. Those system are known to use servo valves that can't tolerate particles above a 3 to 5 micron size. Some additives would plug them. If that system isn't equiped with those valves then I would say go for it. Tranny fluid is often used because of its high temperature properties.



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TomTX

02-16-2007 09:47:29




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 Re: Oil versus Fluid in reply to bent1, 02-16-2007 08:04:21  
What JT said, and whether the sump is common to different companents, like wet brakes, PTO clutch, transmission, differential gears, etc. There are additives for such things as to control/prevent wet brake chatter/grabbing, for extreme pressures, anti-foaming, etc. I have a Bush Hog brand 3-point back hoe with its own reservoir and run with PTO external pump that calls for 10W40 motor oil. I even talked to Bush Hog tech and he confirmed to use the 10W40. Tom

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TomTX

02-16-2007 09:50:06




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 Re: Oil versus Fluid in reply to TomTX, 02-16-2007 09:47:29  
One other thing I forgot is that you have to consider if there are internal leaks between/among oil compartments, such as you sometimes find in older tractors. Tom



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JT

02-16-2007 08:24:38




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 Re: Oil versus Fluid in reply to bent1, 02-16-2007 08:04:21  
Most of the time it is the additives in the oils to be able to withstand the pressure required on each system and the viscosity of the oil. I am sure there are other things, but these two come to mind as being a little important.



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