1, see the specifications are appropriate. When buying agricultural machinery parts, first of all to find out what type of machine parts, and secondly to ask whether it is their own specifications. For example, when purchasing electrical parts, check whether the voltage and power of the parts to be replaced are the same; when selecting the drive belt, pay attention to whether the model and the perimeter are consistent; when selecting the fuel injection head, pay attention to the diameter of the spray hole and the atomization cone angle Accuracy; When selecting a piston or piston ring, it is necessary to distinguish whether it is a standard size or a larger size.
2, see if the logo is complete. The packing box and box shall be marked with the product name, specification, model, quantity, registered trademark, factory name and telephone number. Some large or important spare parts are also equipped with instructions for use, certificates of conformity, and seals for inspectors when they leave the factory. They should be clearly identified when purchasing products to avoid buying counterfeit and shoddy products.
3, see if the joint is flat. For joints, especially castings with sudden changes in diameter or weldments with welds, see if there are any burrs, defects or cracks in the joint.
4. See if there is any rust on the surface of the part. Metal parts to see whether the surface of rust spots, rubber and plastic parts to see if there is significant aging, cracking, loss of elasticity, shaft parts to see whether the journal surface turning contours, etc., if there should be exchanged.
5, to see if the protective surface is intact. The piston pin and the bearing shell shall be protected by paraffin wax. The piston ring shall be coated with anti-rust oil on the surface of the cylinder liner and wrapped with wrapper. The impervious rust-preventing oil such as the plunger pair, outlet valve pair, needle valve pair, valve and piston shall be pressed with a plastic sleeve. Sealed.
6. See if the coupling is loose. The parts made up of multiple parts must not be loosened. For example, the plunger and the adjusting arm of the pump, the clutch driven hub and the steel sheet, the friction plate and the steel sheet, etc. If loose, the normal operation of the part will be affected. Exchanged.
7. See if the rotating parts are flexible. When purchasing the oil pump hydraulic pump assembly, the pump shaft should be rotated by hand and should be flexible and without any stagnation; when the fuel injection pump assembly is toggled, the plunger should be able to rotate flexibly in the plunger sleeve and push the roller The plunger should be able to automatically return under the action of the spring.
8. See if there are missing parts in the assembly parts. The oiler assembly should check whether the small steel ball and other small parts in the steel return tappet of the oil return joint seal are loaded. For the fuel injection pump assembly, check whether the plunger positioning screw, roller body positioning pin, etc. are missing.
9, see the mating surface without wear. If there are traces of wear on the mating surface, or old paint is found after painting the surface of paint, it is mostly used parts.
10, see if the surface hardness is up to standard. The surface hardness of the combined parts is stipulated, and after the purchase is determined and agreed with the merchant, the hacksaw can be used to test for fractures. If the hardness of the scratch is high without scratches, the hardness of the scratches is higher after the stroke. Obvious traces of low hardness.
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