Pulley, Water Pump (W/ AC). PART NO: A-R47126. New water pump pulley fits multiple John Deere Tractor models. . MODELS: John Deere TRACTOR: 4320 (W/ AC) John Deere TRACTOR: 4520 (W/ AC) John Deere TRACTOR: 4620 (W/ AC) John Deere TRACTOR: 7020 (W/ AC).