How do you clean the hydraulic oil filter of John Deere 850

Are you talking about the suction screen in the bottom of the transmission case ? If so just clean it with your favorite solvent and some compressed air. If it is damaged replace it.
Now some of those may of had an optional spin on hyd. filter added in addition and those you just dispose of and put a new one on.
 
Okay, after you clean it with your favorite solvent, stand it on end, pour oil inside it and see how fast it flows out. If it is slow to flow out it is not clean. Those micro screen filters are a PITA to clean. Although a light can shine through the filter, I find that their is often a waxy coating covering the screen. To get the wax coating off use hot, hot, hot water and soap along with compressed air to dissolve the wax and get it out of the screen. Rinse with clear hot, hot ,hot water and air dry before using.. PS: this is best done in the sink or out doors... LOL.
 

Looks like the operator's manual has disappeared . The good news is that a call to the nice folks at 1-800-522-7448 will provide and operator's and/or service manual on CD or hard copy . mother deere was kind enough to post the parts book on the web site.
 
(quoted from post at 10:59:39 01/28/15) I got my filter out of the hydraulic system but now don't know how to clean it. need help. what do I use? :(

I took it into the dealer for them to clean. I hope they know what they are doing. ha ha. I lost a lot of oil about five gallons when I took that part off as it was the only filter I could find to remove. There is no spin filter on my model of tractor. U tube had a guy on there with my exact model showing where the filter was. Of course he was changing his oil and the whole bit. Looks like I need to now. it was rather cloudy, dark pale pink colour and not what I expected at all.
 

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