Hello I’m looking to figure out how to change the control pattern on my 1987 John Deere 690c any help much appreciated
Welcome to HEF Cdumais . The control pattern conversion procedure is not in the Operators manual. Referencing the parts page linked below , at the main control valve swap pilot hoses #7 and 9 and also swap pilot hoses #15 and 20 . https://partscatalog.deere.com/jdrc/sidebyside/equipment/18820/referrer/search/pgId/1730085