Recently had some problem with my old ex60-1 excavator, the swing gear oil always puke out from the dipstick. Gear oil look dirty. Changed the swing motor seal but still having this problem, upon inspection there is no gear oil leak to the grease tub below. May the relief valve on the top cover cause this leak because of over pressure? Or grease from the tub leak up to the swing gearbox?
Good day Ycs Sounds a bit like hydraulic fluid finding its way into the swing box, may be worth dismantling and checking the seal. Kind regards Uffex