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 - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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