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 - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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