First, see if the trademark logo is complete. The outer packaging of the authentic product is of good quality. The handwriting on the box is clear and the overprint is bright. Packaging boxes and bags should be marked with the product name, specifications, quantity, registered trademark, factory name and address and phone number, etc. Some manufacturers will also mark their own accessories. Some important components such as generators, distributors, fuel injection pumps, etc. are also equipped with instruction manuals, certificates and inspector chapters to guide users in the correct use and maintenance. When buying, you should carefully identify to prevent buying fake and shoddy products.
Second, look at the geometric dimensions for deformation. Some parts are prone to deformation due to improper manufacturing, transportation, and storage. During the inspection, you can roll the shaft parts along the glass plate to see if there is light leakage at the joint between the component and the glass plate to determine whether it is bent. Use a tablet lift to observe if it is warped. When choosing an oil seal, the end face of the oil seal with the skeleton should be perfectly round, which can be fitted to the flat glass without any flex. , It should be able to return to its original state after letting go. When choosing various types of gaskets, you should also pay attention to check the geometric size and shape.
3. See if the joint is flat. During the transportation and storage of parts, due to vibration and bumps, burrs, indentations, damage or cracks often occur at the joints, which affects the use of parts. Pay attention to inspection when purchasing.