1.Swing Machinery manufacturer 2.Produce sun gear, planetary gear, carrier, swing shaft, etc ... KOMATSU, CATERPILLAR, KOBELCO, HITACHI.Swing Gearbox, reducer, reduction, slewing machinery, swing machinery, swing motor forKOMATSUKOBELCOHITACHICATERPILLARPC50/55MRSK230-6EZAX330-1CAT325C/DPC56-7SK200-8SZAX330-3CAT330C ...