For a week now working on this crane hyudraulic system.Booms up nice,normal.Booming down very,very slow.Hyd.pump labors harder which I can here.Service done:replaced old rotten hyd.oil filters,repacked both hyd.cylinder,r&cleaned pressure relieve valve,r&cleaned up boom down boom control spool.All clean.Also when left up I can here pop here and there as boom comes down slowly on its own.There is no visible hyd.oil leaks on hoses,fittings.I belive the repacking of main cylinders was wrong recomendation,everything was done not long ago which I found evidence of but I did it anyway.I was hired to do it.Now what next?What am I missing.Also one of the main cylinder has some over load control unit with pilot line.Cleaned that too.No dirt,instaled new O-rings,however have no idea how to preset the pilot line adjustment,rather where is the zero or neutral setting if this is the correct term.Also would like to learn the proper way to do hyd.system diagnostic-trouble shoot problems.Thanks to all who will help me.
Pettibone Multikrane 25
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