Customers plan to buy the accessories of large gear , such as the large gear of ball mill , the rotary kiln, and dryer gear, how to guarantee purchased large gear parts can be installed well during the installation?

When Customers purchase the large gear parts, should pay attention to the followings: if have  the drawing, then find a professional large gear factory,  the price and quality are guaranteed in the professional manufacture ;If there is not drawing, then must know the size of the installation position of large gear and gear modulus , as long as knowing these parameters, will guarantee the successful installation.