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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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