It seems everybody but Yanmar has float on machines up to 8 ton.I questioned a person high up at yanmar as why most manufacturers are not doing this and he told me the industry is reluctant to bring this in as a feature
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That seems easy enough.I have used this valve to add float function on a grader https://www.surpluscenter.com/_MoreSpecs/I9-7989.pdf Tee the two cylinder lines put them to ports 2 and 4 , 1 and 3 tee and return to tank only one solenoid is used