Sure, you can do a DIY cylinder rebuild. However it doesn't seem as though seal kits are available any more for most Sherman equipment. Also there are multiple models of the Power Digger, you didn't say which one you have. Some manuals are still available if you know where to look online. Anyway cylinders of that era usually used stacks of V-packings for the piston and gland main seals. Cylinders also usually have a canned rod wiper and multiple O-rings (or similar such as square or quadrings). If you know how to accurately identify and measure, all of these things are available from a seal supplier such as Baum Hydraulics. The parts can also be matched up (usually) at your local hydraulic shop or industrial seal supplier. Additionally if you have de-chromed rods and a ratty bore a seal job may not seal, or may not last very long due to wear caused by roughness.
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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