Yes, I seriously think a piece of liquid metal that is smaller than a grain of dirt could damage something. If a piece forces out by the U seal it will impart some damage, just as if it stays inside the cylinder caught in the piston packing or gets between the spool and its bore in the valve. It may not be major, just as the fines you see in the bottom of a sump might not be major. They are however signs of contamination and wear. You said all the oil has to go through the filter to get to the tank. The filter has a micron rating and will allow particles smaller than its rating through. Those particles create wear over time, or things would never wear out. The more particles, the more wear. My point was you missed a couple vital parts of the hydraulic system the oil passes through before it ever goes through the filter, so any larger particles in the oil from the cylinder pass through them before being caught in the filter.
Seriously, I do hope your repair works for you. Any such repairs I have seen tried over the years have not held up, but I was around production machines. Your machine use may be light enough to get by for you, at least for a time.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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