1. Inspect the engine's exterior for signs of oil or fluid leaks, and check if the exhaust pipe is blackened or emitting black smoke, which could indicate incomplete diesel combustion. Also, look for any physical damage or deformation on the engine casing.
2. Perform a thorough check of the engine itself—test the cylinder compression to ensure it's strong, and listen for any unusual noises during decompression or rotation. Listen carefully to the engine's running sound; it should be clear and consistent. When you adjust the throttle, the sound should remain normal. Observe the oil pressure gauge, water temperature meter, and ammeter to ensure they are functioning properly, and check that the exhaust smoke is light in color. If everything looks good, engage each gear and test the movement mechanism and chassis transmission. The operating parts should be smooth and free of abnormal noises. After parking, check the fuel tank for any signs of water contamination—such as foam in the oil, which indicates water presence. If any of these issues are found, it may suggest internal cracks in the engine block.
3. Evaluate the overall quality of the agricultural vehicle’s materials, as this directly affects its durability and performance. A high-quality vehicle will use robust and long-lasting components.
(1) The frame, often referred to as the "girder," is the structural base of the agricultural vehicle, supporting both the vehicle and its load. A good frame should be constructed with integrated beams and cross members, not just welded together. If the frame is made using press-stack welding, it likely does not meet technical standards and should be avoided.
(2) The body panels of the agricultural truck come in two types: "cold plate" and "hot plate." Cold-rolled steel has significantly better mechanical strength and corrosion resistance compared to hot-rolled steel, and it is generally more expensive by about 1,000 yuan per ton. Hot plates tend to have rough surfaces, and even after painting, they may not appear smooth or flat.
(3) The transmission housing and rear axle housing should be made from high-quality steel. Their surfaces should be smooth, without defects like porosity or shrinkage. When purchasing, gently tap the housing with a small hammer. A crisp sound indicates good material quality, while a dull sound might suggest minor cracks or imperfections.
(4) Tires make up about 20% of the total cost of a farm vehicle. Check the outer surface for cracks, missing rubber, scars, whitening, or misaligned treads. Pay attention to the type of cord used in the tire’s structure—nylon cords are superior to cotton or rayon, and radial tires offer better performance than standard bias-ply tires.
(5) The paint quality on an agricultural vehicle is not only important for aesthetics but also for protection and longevity. High-quality vehicles use advanced baking techniques to produce a glossy, uniform finish with a hard, durable film. To test the paint, wipe a less visible area with a dry cloth. If the color and shine remain unchanged, it's likely a high-quality finish. If the paint turns white, it may be regular spray paint. You can also test the hardness by applying nail polish to a small area—if the paint peels off and reveals another color underneath, it could be a repainted or rebuilt unit.
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