hydraulic oil compatability

[Scubasteve]

My 843 came with 303 hydraulic fluid in it, so that is what i put in, I know that is wrong and would like to remedy that ASAP. I bought 15 gallons of 10-40 and i planned to shoot out 5 gallons replace with 10-40, drive it around abit, and repeat. I know i will never get it all out, but hopefully i can dilute it to near nothing. My question is: Will mixing the two oils hurt anything? Are they compatable? Has anyone done something similar? I guess its safe to assume that it has mixed oil in it know, or at one time. Any advice would be greatly appreciated, thanks Nick

 

[Tazza]

Not sure what 303 is but i can't see why it would cause an issue if you drained all the oil you could and add more, run it and drain it again. This is how i clean systems that had gotten water in them.
I open an aux hydraulic line, with the machine running at idle i pump all i can out into a drum and as soon as it starts to spit, i shut it off. Remove and drain the hydraulic filter. Fill with oil, run then dump again. When you have it in a state that you are happy with, replace the filter and you are all set.

 

[Bvill01]

Not sure what 303 is but i can't see why it would cause an issue if you drained all the oil you could and add more, run it and drain it again. This is how i clean systems that had gotten water in them.
I open an aux hydraulic line, with the machine running at idle i pump all i can out into a drum and as soon as it starts to spit, i shut it off. Remove and drain the hydraulic filter. Fill with oil, run then dump again. When you have it in a state that you are happy with, replace the filter and you are all set.

How many gallons did u use?