First, see whether the specifications are suitable Most agricultural machinery parts have the specified model and technical parameters. If you purchase electrical equipment, you should pay attention to check whether the voltage and power of the replaced parts are the same; when you purchase the drive belt, you should pay attention to the model and the perimeter; when choosing the bearings, pay attention to the bearing category; When it is time to pay attention to the cone angle of the fog and the diameter of the injection hole, when selecting the piston and piston ring, the standard size and the size should be distinguished to avoid undue losses caused by the wrong purchase.
Second, to see whether the logo is complete The authenticity of the packaging of authentic products is good, the writing on the packaging box is clear, the color printing is clear, the packaging box, box, should be marked with the product name, specifications and models, quantity, registered trademarks, factory name and telephone address Numbers, etc., Some manufacturers still have their own logo on the accessories, some large or important parts are also equipped with instructions for use to guide the user to use and maintain properly. When buying, you should recognize it to prevent buying fake and shoddy products.
Third, to see whether the geometric deformation of some parts due to manufacturing, transportation, storage, improper deformation, prone to deformation, inspection, the shaft can be along the glass plate parts with or without light leakage to determine whether the bending; optional clutch driven plate When steel sheets or friction plates are used, the steel plates and friction plates can be observed in front of the eyes to see if they are warped; when the oil seal is purchased, the end face of the oil seal with the frame should be perfectly round, and it can be attached to the flat glass without flexing. The outer edge of the skeleton oil seal should be straightened, and it should be deformed by hand. After loosening it, it should be able to restore its original shape. When purchasing various kinds of liners, it should also pay attention to check the geometric size and shape.
Fourth, to see whether the joint parts are smooth in the process of handling, storage, due to vibration, bump, often burrs, indentation, damage or cracks, affecting the use of parts, should pay attention to inspection when purchasing.
Fifth, to see whether the parts surface rust qualified parts surface, both a certain degree of precision and high surface roughness, the more important parts, the higher the surface roughness, the rust on the packaging, the more stringent anti-corrosion . Please pay attention to the inspection when purchasing. If there are rust spots, mold spots, or cracks in the rubber parts, loss of elasticity, or obvious turning of the shaft surface on the journal surface, it should be replaced.
6. See if the protective surface is intact Most parts are coated with a protective layer at the factory, such as the piston pin, the bearing bush is protected by factory wax, the surface of the piston ring and the cylinder liner is coated with anti-rust oil and wrapped in wrapping paper; The valve sub, needle valve and other dip rust preventive oil and press-fit sealed with a plastic sleeve; valve, piston and other impregnated anti-rust oil packaged in plastic bags. If damage to the sealing sleeve, loss of wrapping paper, loss of rust-proof oil or paraffin is found during purchase, it shall be returned.
7. See if there are loose parts such as glued joints. Parts made of two or more parts are assembled by pressing, gluing, or welding. No loosening phenomenon is allowed between them, such as the oil pump plunger. The adjusting arm is assembled by press-fitting; the clutch driven hub and the steel plate are riveted together; the friction plate and the steel plate are riveted or glued together; the paper filter core frame and the filter paper are glued together; The head of electrical equipment is formed by welding. If it is found to be loose during purchase, it should be exchanged.
Eight, to see if the rotating parts are flexible to choose the oil pump and the hydraulic pump assembly, turn the pump oil by hand, you should feel flexible and without any stagnation; when you choose the fuel injection pump assembly, when the adjustment arm is toggled, the plunger should be able to The plunger sleeve rotates flexibly. When pushing the roller, the plunger should be able to automatically return under the action of the spring. When selecting the roller bearing, one hand supports the inner ring of the shaft, the other hand turns the outer ring, and the outer ring should be able to rotate quickly and freely. Then gradually stop.
Nine, see the assembly parts are complete In the optional injector assembly, should check the oil return joints sealed copper mat, tappet ball and other small parts with or without leakage; optional injection pump assembly, should Check whether the small parts such as the plunger sleeve locating screw gasket and the wheel body locating pin are missing.
X. See if the assembly mark is clear. The assembly relationship of the protection fittings meets the technical requirements. The assembly marks are engraved on the surface of some parts. Unmarked or indistinguishable markings can make installation difficult and often lead to mistakes.
Eleven, to see whether the wear surface with the wear If the parts with the surface of the wear marks, or painted parts poke the surface paint and found the old paint, mostly for the disguise of waste parts, then can be returned.
Twelve, to see whether the surface hardness of the surface hardness of each fitting has a specified requirements, in the determination of the purchase and with the merchant after the completion of the hacksaw blade can be used to test planning, scratching when the high hardness without scratches; The hardness of the slightly shallow marks is high; the hardness of the visible marks after drawing is low.
Second, to see whether the logo is complete The authenticity of the packaging of authentic products is good, the writing on the packaging box is clear, the color printing is clear, the packaging box, box, should be marked with the product name, specifications and models, quantity, registered trademarks, factory name and telephone address Numbers, etc., Some manufacturers still have their own logo on the accessories, some large or important parts are also equipped with instructions for use to guide the user to use and maintain properly. When buying, you should recognize it to prevent buying fake and shoddy products.
Third, to see whether the geometric deformation of some parts due to manufacturing, transportation, storage, improper deformation, prone to deformation, inspection, the shaft can be along the glass plate parts with or without light leakage to determine whether the bending; optional clutch driven plate When steel sheets or friction plates are used, the steel plates and friction plates can be observed in front of the eyes to see if they are warped; when the oil seal is purchased, the end face of the oil seal with the frame should be perfectly round, and it can be attached to the flat glass without flexing. The outer edge of the skeleton oil seal should be straightened, and it should be deformed by hand. After loosening it, it should be able to restore its original shape. When purchasing various kinds of liners, it should also pay attention to check the geometric size and shape.
Fourth, to see whether the joint parts are smooth in the process of handling, storage, due to vibration, bump, often burrs, indentation, damage or cracks, affecting the use of parts, should pay attention to inspection when purchasing.
Fifth, to see whether the parts surface rust qualified parts surface, both a certain degree of precision and high surface roughness, the more important parts, the higher the surface roughness, the rust on the packaging, the more stringent anti-corrosion . Please pay attention to the inspection when purchasing. If there are rust spots, mold spots, or cracks in the rubber parts, loss of elasticity, or obvious turning of the shaft surface on the journal surface, it should be replaced.
6. See if the protective surface is intact Most parts are coated with a protective layer at the factory, such as the piston pin, the bearing bush is protected by factory wax, the surface of the piston ring and the cylinder liner is coated with anti-rust oil and wrapped in wrapping paper; The valve sub, needle valve and other dip rust preventive oil and press-fit sealed with a plastic sleeve; valve, piston and other impregnated anti-rust oil packaged in plastic bags. If damage to the sealing sleeve, loss of wrapping paper, loss of rust-proof oil or paraffin is found during purchase, it shall be returned.
7. See if there are loose parts such as glued joints. Parts made of two or more parts are assembled by pressing, gluing, or welding. No loosening phenomenon is allowed between them, such as the oil pump plunger. The adjusting arm is assembled by press-fitting; the clutch driven hub and the steel plate are riveted together; the friction plate and the steel plate are riveted or glued together; the paper filter core frame and the filter paper are glued together; The head of electrical equipment is formed by welding. If it is found to be loose during purchase, it should be exchanged.
Eight, to see if the rotating parts are flexible to choose the oil pump and the hydraulic pump assembly, turn the pump oil by hand, you should feel flexible and without any stagnation; when you choose the fuel injection pump assembly, when the adjustment arm is toggled, the plunger should be able to The plunger sleeve rotates flexibly. When pushing the roller, the plunger should be able to automatically return under the action of the spring. When selecting the roller bearing, one hand supports the inner ring of the shaft, the other hand turns the outer ring, and the outer ring should be able to rotate quickly and freely. Then gradually stop.
Nine, see the assembly parts are complete In the optional injector assembly, should check the oil return joints sealed copper mat, tappet ball and other small parts with or without leakage; optional injection pump assembly, should Check whether the small parts such as the plunger sleeve locating screw gasket and the wheel body locating pin are missing.
X. See if the assembly mark is clear. The assembly relationship of the protection fittings meets the technical requirements. The assembly marks are engraved on the surface of some parts. Unmarked or indistinguishable markings can make installation difficult and often lead to mistakes.
Eleven, to see whether the wear surface with the wear If the parts with the surface of the wear marks, or painted parts poke the surface paint and found the old paint, mostly for the disguise of waste parts, then can be returned.
Twelve, to see whether the surface hardness of the surface hardness of each fitting has a specified requirements, in the determination of the purchase and with the merchant after the completion of the hacksaw blade can be used to test planning, scratching when the high hardness without scratches; The hardness of the slightly shallow marks is high; the hardness of the visible marks after drawing is low.
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