This is a two-pump open system, one pump going to each side of a 6-valve bank, with a common return in the middle, giving full flow for multiple movements of the bucket-stick-boom-swing with no loss of pressure. All valves have open centers. The relief valve I want to use has three ports: in, out, and relief to tank. I called Prince Manufacturing (excellent customer service!) and spoke to Andy in the hydraulic department. He said what I want to do will work. There is no manual for this machine - it's about 35 years old, and very little information is available anywhere except for later -3, -5, -7 models that appear to have made many changes. The hoses use Komatsu 30 degree fittings, which are different from JIC, SAE, and NPT, so it's a bit of a challenge to modify. All in all, it's quite an education - thank you all for your advice, comments, and help.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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