Buying agricultural machinery parts is a very meticulous job. Please pay attention to the following matters when purchasing. Whether there are cracks, burrs, and whether the surface of the joint is smooth and smooth, such as piston rings and burrs on the working surfaces of the pistons, it will produce pull cylinders; cracks in the flywheel may cause damage and injury. Check these parts, can be lifted, lifted, tapping with a metal cup, listen to the sound to determine if there is a crack, the sound crisp is better. Whether or not there are rust, mildew, aging parts in storage, if the temperature, humidity in the warehouse does not meet the requirements or there are other organic solvents, the metal parts will rust, paper mats, cork pads and other parts of the mold, rot Bad, aging rubber parts. If parts are found to have rust, mildew, or aging, they should not be purchased. With or without deformation, geometric dimensions meet the requirements if the parts are stored inaccurately, easily deformed, such as valve stems, camshafts and other shaft parts, check the push rod or camshaft flat on the counter glass, the Turn one turn and observe the journal of the push rod or camshaft. If there is light leakage, it indicates that it has been bent. When buying all types of molded liners, check the geometry and shape. Whether loosening, degumming, and desoldering are some of the accessories are composed of more than two parts together, such as the plunger and the arm of the oil pump is assembled by press-fitting, there can be no loosening phenomenon between them. When purchasing paper filter elements and other parts, pay attention to whether or not there is degumming at the joints; when purchasing electrical parts, pay attention to the line heads must not have the phenomenon of desoldering. Whether the surface protection layer is intact Many agricultural machinery parts are protected by a protective layer at the factory. If the cylinder liner is protected with paraffin, if the wax layer on the part is found to be lost when it is purchased, the sealed bag is damaged, and the sealing coating is cracked, it should be replaced. If the rotating parts are flexible, for example, when selecting the fuel injection pump assembly, when the adjusting arm is toggled, the plunger should be able to rotate flexibly in the plunger sleeve. When the oil pump is running, the rotor should be free from seizure. Whether the assembly components are missing parts such as clutches, fuel injectors, oil pump assemblies, etc., should pay attention to the completeness of each component of the assembly when purchasing, especially pay attention to see if the small parts are missing or not. Whether the assembly mark is clear to ensure the correct assembly relationship of the machine, the assembly marks are engraved on the surface of some parts. For example, the markings on the single rack and pinion pump and the marks on the generator and the battery lead wire. If the specification, model, and main technical parameters meet the requirements, such as when selecting the clutch spring, the difference between the heights of the springs must not exceed 2 mm; when selecting the electrical equipment, check whether the voltage and power of the replaced parts are consistent. Whether the specification and certificate are complete The important agricultural machinery accessories should also check whether there is a factory name, a factory address, a registered trademark, and a factory date on the package to prevent counterfeit goods and other inferior products.