See trademarks are complete. Authentic automobile spring packaging quality is good, clear writing on the box, bright overprint. Packaging should be marked with the product name, model specifications, the number of registered trademarks, Make the site and phone number, and so on, some manufacturers also his own mark on the accessories. The purchase should be careful to clearly understand, prevent buy fake and shoddy products.
Second, look at the geometry of the presence or absence of deformation. Some parts due to manufacturing, transport, improper storage, easy to produce deformed. Check along the glass plate of the shaft parts scrolling circle to see the parts and glass bonding at the presence or absence of light leakage to determine whether the bend; films the optional clutch plate steel or friction, steel, friction piece held in front observe whether warping; buy oil seal skeleton oil seal end face was positively round, with flat glass fit without flexing; skeleton oil seal outer edge should be upright, holding its deformation should be able to let go after restitution. Buy all kinds of liner, you should also be careful to check the geometric size and shape.
Third, look at the binding site is flat. Spare parts in the process of moving, storage, due to vibration, bump, often in the binding site of burrs, indentation, damage or cracks, the use of the affected parts. The purchase should be careful to check.
To see whether the corrosion of the surface of the part. Qualified spare parts surface, both accuracy and burnished finish, the more important parts, the higher the precision packaging rust and corrosion more stringent. The purchase should be careful to check parts rust spots, mildew spots or rubber pieces cracking, loss of elasticity, or the the journal surface Cutters lines should be swapped.
Fifth, look for loose glued parts. By the combination of two or more parts, accessories, parts, press-fit, glued or welded, they are not allowed loosening. When you purchase loose should be swapped.
To see whether flexible rotating parts.
To see the assembly parts for lack of parts. Formal components of the assembly must be complete and intact, in order to ensure a smooth assembly and uptime. Some individual small parts assembly parts missing equipment, assembly components will not work even scrapped.