i just bought a 1882 build 245 cat excavator on delivery they broke the head on the stick cylinder so rebuilt that replaces some hoses and such now it has decided to swing to the left constantly it will go around and around picking up speed to the point where it wants to flip the machine . i pulled the pilot vale on the left control which is dead sticking right now and no issues some minor wear gunk but nothing special one would thing they would put a magnet sink in there to catch the wear crap .anyways pulled the pilot vale apart no issues flushed it cleaned it and still same this machine swings to the left constantly any ideas as to where i should start looking for next possibility? serial number is 84x663 .made in belgium in 1982 the salesman said it was a 86 so have no clue there . but any advice would be appreciated as anytime i touch the thing it costs thousands @Cat up here it is 166 a hour and a 500 call out 3k to take it to them so am am trying to fix it myself but got lost in the maze of hoses trying to trace where they go there's 4 small ones on the side of the valve and two to feed and return and there is one small one on the bottom under the feed tubes .