APO 7K JC50 drawworks Product Details All bearings are rolling bearings and the shafts are made of alloy steel. The chains are pressure lubricated. The drum is grooved. The low-speed & high-speed ends of drum shaft are equipped with a ventilating air tube clutch. The brake rim is water cooled and the surface is medium— frequency induction hardened which provides long service life. The contours of the sprocket teeth are medium frequency induction hardened. All transmission
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