1, the adhesive parts are not loose
Many of the bonded parts are composed of 2 or more than 2 parts combined into parts, is through pressing, welding or bonding, between them out if loosening the consequences will be grievous, the plunger and the adjusting arm is pressed by combination; clutch driven wheel and steel sheet is riveted with friction. Plate and steel sheet is riveted or glued; and the filter element frame is through connected with the glue into paper filter, so the time of purchase once found loose, need replacement.
2, look at the packaging
The original pieces can be in the quality of the packaging recognized one or two, such as the specifications of the standard unified standard, and on the outer packing is very clear, without the slightest blur, color is printed. Will indicate the product name, specifications, quantity, registered trademark, name and address and phone number and other information, and some even made their own mark accessories.
The 3 parts, the flexibility of the operation
For some on the rotating work components, should check the parts rotation flexibility when choosing to buy; like rolling bearings, left and right hand respectively support the inner and outer ring spinning operation. At this time, the inner ring should experience from the fast rotation of full stop process. If found, the part rotation is not flexible enough, that there is rust corrosion or shape change, must not buy.
4, look at the surface
The regular auto parts surface has distinct characteristics, not only typefounding very clear, and the surface gloss. Another point is often more important auto parts must be of high precision, so it will be the way to protect caution. So, if it is found that the rubber parts with corrosion spots or cracks, or connecting parts surface has obvious grain, certainly not easy to choose.