1, 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. 2, see whether the specification model is suitable 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. 3, see if the joint is flat on the joints, especially the sudden changes in the diameter of the casting or weldment of the weldment, see if there are no burrs, defects or cracks in the joint. 4, to see whether the parts surface rust 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, 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 connector 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 surface hardness is up to standard The surface hardness of the mating parts is stipulated. After confirming the purchase and negotiating with the merchant, the hacksaw can be used to test for fractures. If the hardness of the scratch is high, the hardness of the trace is high, and the hardness is high after the stroke. Obvious traces of low hardness. 8, see if the rotating parts are flexible When selecting the oil pump hydraulic pump assembly, turn the pump shaft by hand, you should feel 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 to position under the action of a spring. 9, see if the assembly parts are missing parts The injector assembly shall be checked for leakage of small parts such as small steel balls in the steel gasket tappet of the oil return joint seal. For the fuel injection pump assembly, check whether the plunger positioning screw, roller body positioning pin, etc. are missing. 10, see the surface with or without wear If the wear surface with traces of wear, or painted parts poke the surface paint found after the old paint, it is mostly used parts. The main indicator for judging the nutritional value is the content of protein, while oyster mushrooms are rich in protein and have the advantages of low fat and low sugar.Oyster mushrooms contain 18 amino acids needed by the human body. In particular, the 8 amino acids that the human body cannot synthesize are particularly high, of which lysine and arginine, which promote children's growth and intelligence, account for 9.4% of the total. Fruit Smell Oyster Mushroom Spawn Oyster Mushroom Seed,Oyster Mushroom Spores,Fruit Smell Oyster Mushroom Spawn,Mycelium Oyster Mushroom Substrate Shandong Qihe Biotechnolegy Co.,ltd. , https://www.qihebio.com