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 - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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