Metal recycling casting is an alternative for the development of the foundry industry in Indonesia. The use of scrap metal as industrial raw material is increasing, so that it becomes a trading commodity and encourages the development of metal smelting businesses. The objective is to study the metal casting process of the B3 × 7 inches pulley using the sand casting method and to analyze the defects that appear on the B3 × 7 inch pulley. Pulley is one of the casting products with materials from cast iron which is used as a machine propulsion tool. The raw material from cast iron which is produced itself consists of scrap left over from smelting, gram, charcoal, silica and the addition of slag remover. The resulting cast iron is melted in an induction furnace at a temperature of 1350 – 1450˚C. The smelting results are then poured into wet sand molds using a ladle, then the castings are cleaned and checked for defects (quality control) prior to machining and finishing processes. Carried out product analysis and found casting defects that occurred due to external and internal factors such as defects in air voids, crack defects, and collapsed molds (kataochi).