How to choose truck accessories?

1. Check whether the trademark logo is complete

The outer packaging of authentic truck parts is of good quality. The writing on the packaging box is clear and the overprinting color is bright. Some manufacturers also put their own marks on the accessories. Some important components, such as generators, distributors, fuel injection pumps, etc., are also equipped with instruction manuals, certificates of conformity and inspector's stamps to guide users in correct use and maintenance. Be careful not to buy counterfeit and shoddy products.

2. Check whether the geometric size is deformed

Some truck parts are prone to deformation due to improper manufacture, transportation and storage. Therefore, during the inspection, you can roll the shaft parts along the glass plate for a circle, and see if there is light leakage at the joint between the parts and the glass plate to judge whether it is bent. Hold it up in front of your eyes to see if it is warped. When purchasing oil seals, the end face of the oil seal with a skeleton should be a perfect circle, which can fit the flat glass without bending, and the outer edge of the oil seal without a skeleton should be straight. Hold it by hand to deform it, and it should be able to return to its original shape after letting go. When purchasing various types of pads, you should also pay attention to check the geometric size and shape.

3. Check whether the joint is smooth

During the transportation and storage of truck parts, burrs, indentations, breakage or cracks will often occur at the joint parts due to vibration and bumping, which will affect the use of parts. Pay attention to inspection when purchasing.

4. Check whether there is rust on the surface of the parts

Qualified spare parts have both a certain precision and a bright finish on the surface. The more important the spare parts are, the higher the precision is, and the packaging is more strictly anti-rust and anti-corrosion. You should pay attention to inspection when purchasing. If it is found that the parts have rust spots, mildew spots, or rubber parts are cracked, lost elasticity, or there are obvious turning lines on the surface of the journal, they should be replaced.

5. Check whether the protective surface is intact

Most parts are coated with a protective layer before leaving the factory, such as piston pins and bearing bushes are protected with paraffin wax, piston rings and cylinder liners are coated with anti-rust oil and wrapped in wrapping paper, valves, pistons, etc. are soaked in anti-rust oil and packaged in plastic bags. If you find that the sealing sleeve is damaged, the wrapping paper is lost, the anti-rust oil or paraffin is lost when purchasing, you should return it.

6. Check whether the glued parts are loose

Fittings composed of two or more parts are press-fitted, glued or welded, and looseness is not allowed between them. For example, the oil pump plunger and the adjusting arm are combined by pressing, the clutch follower and the steel plate are riveted, the friction plate and the steel plate are riveted or glued, and the paper filter element skeleton and the filter paper are glued. The wire ends of electrical equipment are welded. If it is found to be loose when purchasing, it should be replaced.

7. Check whether the rotating parts are flexible

When purchasing an assembly of rotating parts such as an oil pump, the pump shaft should feel flexible and free of stagnation when turning the pump shaft by hand. When purchasing rolling bearings: support the inner ring of the bearing with one hand, and rotate the outer ring with the other hand. change. If the rotating parts do not rotate well, it means that the interior is corroded or deformed, so do not buy it.

8. Check whether there are any missing parts in the assembly

Regular assembly components must be complete and intact to ensure smooth assembly and normal operation. If individual small parts on some assembly components are missing, the assembly components will not work or even be scrapped.

9. Check whether the assembly mark is clear

In order to ensure that the assembly relationship of the mating parts meets the technical requirements, assembly marks are engraved on the surface of some parts (such as timing gears). If there is no mark or the mark is blurred and unrecognizable, it will bring great difficulties to assembly, or even wrong assembly.

10. Check whether the mating surface is worn or not

If there are wear marks on the mating surface of the parts or the old paint is found on the painted parts after the surface paint is removed, it is mostly a waste part camouflage, and you can ask for a return at this time.

11. Check whether the surface hardness is up to standard

There are specified requirements for the surface hardness of each fitting. After confirming the purchase and negotiating with the merchant, you can use the stubble of the hacksaw blade for trial scratching. If it slips and has no scratches when scratching, it means that the hardness is high; if there is a slight shallow mark after scratching, the hardness is high;