"To make good girth gears" is the positioning and requirement of Great Wall Casting (CHAENG) for its own products. The person in charge of CHAENG said, "CHAENG's own rule is to avoid any defective products from leaving the factory." In the casting process of the cement mill girth gears, each girth gear will undergo a 360° non-destructive inspection to ensure that the internal and external quality of the large gear is guaranteed.

The almost strict quality management has enabled CHAENG to achieve rapid growth for many years. The impressive achievements have not stopped CHAENG. CHAENG adopts a standardized quality management system and successfully passed the ISO9001:2015 quality management system certification.