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Beam-pumping units Pumping Unit Rated Load of Suspension Point kN(tf) Max Stroke of Polished Rod m Rated Torque of Decelerator kN.m (kgf.m) 8-3.0-37 80 (8) 3.0 37(3700) 10-3-53 100(10) 3.0 53 (5300) 12-4.2-73 120(12) 4.2 73(7300) 12-4.8-73 4.8