Burned Hydraulic Oil
Burned Hydraulic Oil
(OP)
Friends,
We used mineral oil in the hydraulic unit. Three times changed hydraulic oil.The oil seems burned and smelling like burned. The unit temperature around at 40 degC.Why did it burned in the unit?
Alper
We used mineral oil in the hydraulic unit. Three times changed hydraulic oil.The oil seems burned and smelling like burned. The unit temperature around at 40 degC.Why did it burned in the unit?
Alper





RE: Burned Hydraulic Oil
Rod
RE: Burned Hydraulic Oil
I would suspect oxidation. Rapid oxidation occurs when hydraulic oil is "cooked" in an overheated situation normally brought about by inadequate cooling or an improperly functioning system. Cooked oil is a dirty brown color and machine parts look "varnished.
The problem is most likely due to thermal stressing of the oil, as opposed to straight oxidation. Improperly functioning system can causing the oil to over heat. Small localized hot spot in a valve or motor cook the oil, but a high temperature would never detected as a rise in bulk oil temperature. Your first indication of a problem is the change in the oil’s color.
Remember to drain and flush the entire system and clean or replace any filter screens. Also you should check with your lube representative or supplier for recommendations and compatibility. Consider changing to a synthetic oil. Did you check the oils Viscosity and PH?
RE: Burned Hydraulic Oil
RE: Burned Hydraulic Oil
also do a color test but best of all a metal test which will actually tell you the most probable cause of the problem. Any lab that does a metal test will hone in on the problem.
RE: Burned Hydraulic Oil
www.titanracinglab.com
Rod
RE: Burned Hydraulic Oil
The unit operating time only 2 years. As a hydraulic oil base on mineral oil.Every two month we analyzed in laboratuvary for viscosity, pH, water, wearing elements,etc...
TAN value (total acidite number)and oil viscosity a little decreased, wearing elements into limits,no water in tank, but Zn (Zinc) value decrease very shortly(This value shows quantity of oil additive).
Why did decreased oil additive quantity?
Otherwise I checked and measured every point with non-contact temperature gun(on the valves, cylinders, pumps, ect...). I measured temperature
not too much(generally 30-40 degC).
RE: Burned Hydraulic Oil
Rod