got a 1995 jd 8770, hydraulics failed and it was limped to the shop. hydraulic pump was replaced and also steering valve block, it was leaking, and now everything works but its loud. when you steer, raise or lower an implement its loud like the system is moaning and groaning. acts like its starved for oil but its not, lots of oil. we can olny get 20 gmp on the scvs, should be almost 40 mechanic thinks the brand new pump could be faulty, anyone else ever had such a problem?