Buy agricultural vehicles common sense

1. Appearance When purchasing a vehicle, some users should correctly select the applicable brand based on the type and model of the vehicle according to the conditions of use, the level of use, the nature of work, the working environment, and the economic ability. At the time of purchase, appearance quality inspection is the first step in selecting the inspection. (1) Check the integrity of the machine. Whether the external parts are missing or damaged, and whether the body or the casing is damaged or cracked. Special care should be taken to check the integrity of the cover and lighting fixtures. (2) Check the paint quality. Appearance should be bright color, smooth and bright, no peeling paint, scratches, damage and flow marks ripple, paint thickness should be consistent with no leakage. (3) Check the doors, windows and glass of the vehicle. The installation should be smooth and firm, and the gap should be even and even. (4) Check each welding position. The welding should be solid and reliable. The weld should be even and straight. There should be no burn-through, missing weld, slag inclusion, porosity and false welding. In addition, the stampings must not have defects such as wrinkles, pull marks and cracks. (5) Check the tightening of the connection bolts of the important parts (steering gear, brake, transmission case, front and rear axle, and tires). (6) Check the three leaks (oil leaks, leaks, and leaks) at various locations. Special attention should be paid to check whether the cooling water discharge switch, fuel tank switch, transmission oil drain plug, oil pan oil drain plug, fuel piping, cooling water piping and oil piping are leaky. Carefully loosen the oil drain plug and check it. If water flows out, you should suspect that there is a leak inside the unit. 2. Diesel engine diesel engine is the heart of agricultural vehicles, its performance is good or bad, a direct impact on the working conditions of the vehicle must be carefully checked. (1) Check start performance. According to the requirements of the instruction manual, add oil and water, and if the battery is fully charged, start it three times in a row, each time more than 2 minutes apart. There should be at least 2 start-ups of the 3 vehicles, and the start-up time should be within 5s. (2) Check the air condition. After starting the diesel engine, the operation should be easy and smooth, the sound should be pure and crisp and full of rhythm, and the oil pressure should be kept normal. (3) Check acceleration performance. Add the diesel throttle to the mid-speed operation, stabilize it a bit, then quickly increase the throttle and release the throttle. Repeat this several times. If the diesel engine is feeling light and quick and sensitive, it means that the diesel engine has good acceleration performance. 3. Chassis The chassis is the body of agricultural vehicles and has a considerable impact on driving conditions, especially in some important areas, not only driving performance, but also personal safety. (1) Check the steering system for each adjustment position. For example, whether the steering gear assembly and steering knuckle are adjusted properly, whether the left and right steering circle diameters meet the requirements, whether the toe-in adjustment is correct, whether the ball nut pins, the cross-straight rods, and the connecting nuts of each nut are loaded and tightened, and whether the steering is light and flexible. Wait. (2) Check brake performance carefully. Braking must be easy, fast, smooth, safe and reliable. At a certain speed, the braking distance (the distance from the brake pedal to the stopping of the vehicle), the length of the tire towing marks, and the tracking deviation amount (relative to the front and rear wheel centerlines) should meet the requirements. (3) Check the working condition of the transmission system. The clutch must be completely separated, the joint should be stable and reliable, and there must be no abnormal phenomena such as jitter, slippage and noise. When the gearbox is working, the gear shift should be easy and smooth, and the joint should be safe and reliable. There must be no unblocking, chaotic gear, and skipping, and the operation should be normal with no abnormal noise. There should be no abnormal noise when working on the front and rear axles, and the front and rear wheels should be free from deflection. 4. Hydraulic unloading part (1) The hydraulic control system must be operated easily and flexibly, and the oil lines and pipe joints should be connected firmly without leakage. (2) Check hydraulic performance. Put the joystick to the “lift” position to gradually increase the throttle of the diesel engine. The lift cylinder will increase as the throttle increases. When the cylinder lifts to the top, the safety valve will open. “Sound and bang” sounds, then the diesel engine emits black smoke (with load); at this time, the handle is immediately pulled to the “down” position, and the fuel tank should drop steadily. (3) Check the status of dumping work. When the cylinder is lifted to the highest position, the inclination of the carriage shall not be less than 45. The lifting time (from the start of lifting to completion of lifting) shall not exceed 20s; under the specified loading quality, the static settlement (the vertical drop of the cylinder when the diesel engine is off) Degree) must not exceed 5%. 5. The electrical system checks all kinds of lamps, electrical instruments and safety indicator devices, and the installation must be firm, reasonable and orderly, and the lines should be neatly arranged. All kinds of electrical appliances should be accurate, sensitive, safe and effective, and must not be confused. 6. Other notes (1) Buy brand-name products. The socially recognized branded products not only have good technical performance and manufacturing quality, but also have relatively complete after-sales service. Therefore, when a user purchases, brand-name products are preferred in the same type. (2) Select the product purchase in the catalog. For example, the agricultural transport vehicle must be the product of the “Agricultural Transport Vehicle Production Enterprise and its Product Catalogue of 2000” promulgated by the former State Bureau of Machinery Industry, otherwise the management department will not grant a license. (3) understand the product after-sales service and accessories supply. According to the “Regulations on the Responsibility for Repair, Replacement, and Return of Agricultural Machinery Products” jointly issued by the six ministries and commissions of the State Economic and Trade Commission and the State Administration of Quality and Technical Supervision, agricultural machinery products sold to farmers within the People's Republic of China must implement “Three Guarantees”. Requirements After the sale of products should be set up maintenance outlets, supply repair parts and technical advice. Buying agricultural vehicles with better after-sales service can eliminate all kinds of worries. (4) Prevent the purchase of shoddy vehicles by mistake. When a user purchases a farm vehicle, he should go to the manufacturer or the agricultural machine company to purchase a new car. If it is determined by economic conditions that it is decided to buy an old vehicle, it should go to the agricultural machinery trading market and purchase it under the supervision of the management personnel. When purchasing, it is best to invite agricultural machinery technicians as consultants to purchase according to their own needs. Don't try to be cheap, buy a "black car" with poor technical condition and no license. (5) After the vehicle is purchased, it is necessary to check whether the attachment is complete. The purchased commodities should have product instructions, product certifications, three packs of certificates, and related technical documents. Random tools and spare parts should be complete. The user should properly preserve the certificate of conformity and the purchase invoice, because the certificate of conformity and the invoice are not only the basis for the inspection of the license issued by the management department, but also the basis for the manufacturer to implement the “three guarantees” and must not be lost.