With the development of rural economy and the rapid transfer of labor force, the importance of agricultural machinery in agricultural production, especially food production, is becoming more and more prominent, its development is an important symbol of the development of modern agriculture, but also an important embodiment of the level of agricultural productivity.

However, in order to enable these agricultural machinery to play an important role in agricultural production, it is inseparable from an important mechanical component - diesel engine. Diesel engine is the main supporting power of agricultural machinery such as tractors, agricultural transport vehicles and harvesting machinery, diesel engine for agricultural machinery, as important as the heart for human, the quality of diesel engine directly affects the normal use of agricultural machinery and agricultural production work, so a good diesel engine will play a vital role.

At present, there are many brands of agricultural diesel engines, but their quality is uneven, the pass rate is not high, so that users are difficult to choose when buying, therefore, how to buy a good quality and suitable for the use of agricultural machinery diesel engine is very important.

1. The product production enterprise should obtain the production license and the agricultural machinery product promotion license issued by the Ministry of Agriculture, each product has the above two certificates of identification and certificate number.

2. Beautiful appearance, neat, uniform and bright color; The surface is free of scratches, deformation and imperfections, and the baking paint is free of defects such as paint leakage, paint flow, peeling and scratching. Casting performance is smooth, no burrs, trachoma or cracks; The connecting bolts are fastened, and the layout of the components is reasonable. Exposed rotating parts such as flywheels, starting claws, etc., and exhaust pipes and water tanks with high temperature hazards should be equipped with protective devices.

3. The vehicle tools, spare parts are complete, the "three guarantees" maintenance card and its content meet the national standards, the use of maintenance instructions are detailed, the product certificate or the manual has the product standard code identifier executed by the product.

4. The new machine is relatively easy to shake, no noise, can start smoothly; After starting, the operation is smooth, the speed regulation is flexible and normal, the sound is crisp and loud, and the exhaust is smoke-free or only light smoke; The oil pressure indicator can rise immediately after starting, press it down with your finger, and rise quickly after letting go; The whole machine has no oil leakage, water leakage, air leakage phenomenon, oil and water switch and throttle operation is flexible and reliable.

5. Good power. The MaxPower issued should be consistent with the power labeled on the product nameplate, and the deviation should not exceed 5%. Too small, the power is seriously insufficient; Too large cause the overload of diesel engine operation, shorten the service life of the machine, but also cause noise, exhaust smoke and fuel consumption rate exceed the standard, serious pollution of the environment.

In addition, diesel engine as the main power source of agricultural machinery, its working performance is good or bad, directly affects the economic performance and power performance of agricultural machinery, so in the process of use, daily maintenance is very important.

1. Check the diesel engine frame screws and each part of the connection fastening. When the diesel engine is found to have pendulum instability, special attention should be paid to the fastening of the diesel engine mounting pad and fixing bolts.

2. Check the cooling water, add clean rainwater and river water when insufficient. Diesel engine hot car can not directly open the water tank cover to avoid hot gas out of scalding people; Cooling water can not use well water and spring water; When the cooling water is dried and overheated, the cooling water should be added after the diesel engine cools down. Check the tightness of the fan belt (10-15mm deflection of the belt pressed by the thumb is appropriate); Check water tanks, pumps, and pipes for leaks.

3. Check the oil level and oil quality, add when insufficient, and replace the oil when the deterioration is serious. Check the oil level, stop the tractor flat, and wait for five minutes after extinguishing, to check; Check oil pan, cover, etc. for oil leakage.

4. Check after operation. See if the smoke is normal. The normal exhaust smoke color is colorless or light gray, the blue smoke is caused by burning oil, the black smoke is caused by incomplete diesel combustion, the light white smoke is caused by water participation in combustion, and the thick white smoke is caused by diesel without combustion. The diesel engine must run smoothly, and when the diesel engine shakes and the speed is abnormal, the fault should be eliminated in time. Test the throttle to determine the working condition of the diesel engine; Pay attention to the working temperature of the diesel engine, overheat and too cold are not conducive to the normal operation of the diesel engine.

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