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Just a question for a opinion does anyone have a idea of the typical micron rating of a filter screen that is in the tractors hydro system ( no loader in place) Reason I ask I replaced my filter screen housing with a screw on filter housing and am using a 25 micron filter so I do not know if I should go to a finer filter media on the next filter change or I am good enough. Thanks Dave
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Is that on the suction side or pressure return side?
I would think that 25 micron would be fine. Smaller is better until you get to the point that the oil viscosity causes flow problems through the filter.
If what you originally had was the 100 mesh screen, then 25 is multiple times smaller.
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it is a suction side mounting and that is what I thought that typically a screen would be courser than a 25 micron filter, do you think taking the magnets out of the old screen housing and putting them inside the new filter is worth doing? or would the 25 micron spin on filter make them unnecessary?
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According to this web site 100 mesh is 149 microns.
https://www.filterbag.com/U-S-Mesh-vs-Micron-21.html
I don’t remember where I got the 100 mesh size as it is not listed in my parts book. I must have read or heard it somewhere, but I can’t confirm that number. In any case, I can see through the screen but not 25 micron filter material. More than likely there is nothing in your hydraulic system have clearances smaller than25 micron.
If you cause too much resistance to flow on the suction side, it can lead to cavitation of the pump gears which will be way more damaging than any debris that may pass the filter. An additional risk is causing a suction side leak which lets air into the system and that can drag dirt in with it. If this happens it will be on the “clean” side of the filter. I have this problem when operating at temps below zero even with 10W hydraulic oil.
The magnet idea can not hurt. You could put magnets on the outside of the filter can. 3 or 4 rare earth magnets spaced out evenly would probably do the trick. You could also drop one into the tank itself. Putting them on the filter would facilitate diagnostics when you cut the filter open for inspection.
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