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Piston Assembly:Piston Assembly is made of forged alloy steel, on which a herringbone gear with the medium-hard teeth surface is machined. For easy maintenance, single row radial cylindrical roller bearing with double ribbed outer ring is used. The pinion shaft ends are prolonged so that sheave or sprocket can be mounted on either end.Double metal cylinder piston:Our company production of various specifications of the piston assembly, uses the high quality import Nitrile butadiene rubber manufacture, piston steel reinforced material of 45 # steel, normalizing treatment, hardness is not less th