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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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