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Old 12-26-2009, 04:46 PM
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Default How hot can you run hydraulic oil?

The oil in my tractor keeps getting contaminated from condensation. I tried letting it settle out but it doesnt work that well. Right now I have it simmering in a pot, at 150* (assumed safe temperature) in an attempt to drive off the water.
How hot can I get it before the oil breaks down? The specific oil is Kubota UDT.

I am sure I will have to do it a few times to get everything out but at $8/gallon I will give it a shot. If it works I might get an immersion heater for the bottom of the reservoir.
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Last edited by Cavalry; 12-26-2009 at 10:18 PM.
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Old 12-26-2009, 04:55 PM
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Are you sure its condensation? Do you store the tractor inside? Have never had a problem with this that I've noticed on dad's kubota or any other ones I've been around.
Do you still have the gooseneck type hoses for all the vents? Maybe you have water running in from melting snow or rain or something?
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Old 12-26-2009, 05:29 PM
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I had this problem last year when it was stored under cover 100% of the time. I changed the oil out because it was unknown the last time it was done. This year space is premium so its outside. I have checked all the vents and the shift boot, I see no place for it to get in. Guy I work with stores his inside (similar vintage but smaller) and has the same problem.
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Old 12-26-2009, 06:02 PM
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Default oil temp

Check the container it may have this info. in the small print. Different oil brands and grades have different ratings. I think you would be OK at 150. We use Shell brand at work not sure of the grade it's rated at 250deg.
The higher the temp rating the higher the cost.
We use a lot of high speed hyd. equipment so we need the high temp stuff along with fluid cooler.
Something to consider is the oil may take it but that don't mean the seals in your system will take it.

Last edited by Machinist-Guide; 12-26-2009 at 06:10 PM.
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Old 12-26-2009, 06:45 PM
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Mobil DT20 starts to get erratic in high speed PLC controlled equipment at about 185 deg.
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Old 12-26-2009, 07:53 PM
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Quote:
Originally Posted by midmosandblasting View Post
Mobil DT20 starts to get erratic in high speed PLC controlled equipment at about 185 deg.
We use coolers on most of ours. I am hot sure how they work the maintenance guys take care of them. The oil circulates through a radiator. I don't know if its air cooled or what. And the safety man has a limit on how hot it can get that is some what lower then the oil rating.
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Old 12-26-2009, 08:59 PM
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On our equipment we like to keep temps. 180 or less and definitely under 200. I quizzed an engineer from Parker one time on it and that was his recommendation.
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Old 12-26-2009, 09:53 PM
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Quote:
Originally Posted by Cavalry View Post
The oil in my tractor keeps getting contaminated from condensation. I tried letting it settle out but it doesnt work that well. Right now I have it simmering at 150* (assumed safe temperature) in an attempt to drive off the water.
How hot can I get it before the oil breaks down? The specific oil is Kubota UDT.

I am sure I will have to do it a few times to get everything out but at $8/gallon I will give it a shot. If it works I might get an immersion heater for the bottom of the reservoir.
Per the MSDS- UDT's flashpoint is 374*F here and Super UDT is 176*F here
And I am assuming transmission oil here right?
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Old 12-26-2009, 10:16 PM
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It shares the same oil in the gearbox, 3 point, and external hydraulics.
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Old 12-26-2009, 10:45 PM
Rentawrench Rentawrench is offline
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Put in a Clean 5 gal pail an let it FREEZE then pour off the oil. I know this trick will not work everywhere But in Cold areas it will work to get water out of most products

you should be useing a winter weight oil( thin)
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