... , Kobelco, Caterpillar,Hitachi We manufacture Hydraulic Cylinders for Excavators.Arm cylinder, Boom Cylinder, Bucket Cylinder for Komatsu, ... Kobelco, Caterpillar, Hitachi Excavators.We can produce excavator buckets, pin, bushing, arm, ... recoil spring, idler, track roller, sprocket, carrier roller and so on. Almost all of the parts for komatsu excavators PC50 ...