Mechanical/Hydraulic self-centering pullers Mechanical/Hydraulic self-centering pullers  Three-arm union,Website:http://www.dudemachinery.com, self-centering, easy to use.  Claws of pullers are forged of high-strengthen alloy steel.  Both mechanical and hydraulic puller are variable. Tonnage range: 7ton-60ton Self-centering structure, it prevents unbalanced load happening, which will make operation simpler, easier and swifter