my Liberty 430 acted up like that earlier this spring on the planter ,.it was low on hydro fluid caused by a leaking hydro line ,fixed the lek and changed the hydro filter ,THEN filled it up with case tech fluid that I have for the 1070,.just could not get any Real working pressure to lift the 3pt arms or the remotes ,,after a few days doing non hydro work the lift would occassionallly raise , but would not cycle up and down , I too could hear the pump tryin to do some thing ..I knew the pump was workin then ,,. the 430 hydraulic problem has very few hits in the CASE Forum archives , so apparently there are few problems with the hydraulics as compared to other case tractors ..perhaps in the Liberty 430 , therewas a airlock someplace in the system that took a while to work thru ..it has lifted round bales and the nh 477haybine every time for over a month now and all seems to be working perfect for NOW .. this info probably is of little help TO YOU , other than you mite have a similar circumstances and can relate ..
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