Posted by JerryCPP(WA) on December 30, 2019 at 19:25:24 from (66.172.99.31):
I just got a very old Komatsu PC05 mini excavator. It had a new thumb installed before I got it. They got pressure for the thumb by cutting and welding a cap on the ¾” pipe return line, taking pressure from that line, running it to the thumb valve with 3/8” hose, and back to the filter and tank, effectively making the main return line 3/8” hose. I don’t think restricting the return line is good. I want to put a T in the main pressure line (manual says main line max is 2489 pounds,) install a Prince R1850H relief valve in the new line, set it to 1000 pounds, and run that hose to the thumb valve. Then when you activate the thumb, it will only get 1000 pounds pressure. When you curl the bucket, the thumb cylinder will over-pressurize, causing the Prince valve to relieve pressure to 1000 pounds, with the blown-off oil going back to the tank. I will restore the original main return line to ¾”. Am I off base here? Suggestions?
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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