Agricultural tractor quality appraisal

Agricultural tractor is a self-propelled power equipment used in agricultural production and has a variety of functions and uses. It can be used for field plowing, harrowing, soil preparation, cultivating, sowing, harvesting and transportation. The advantage of
agricultural tractor is that it can reduce labor burden and improve agricultural production efficiency. It consists of systems or devices such as engine, transmission, travel, steering, hydraulic suspension, power output, electrical instruments, driving control and traction. In modern agricultural production, tractors have become indispensable mechanical equipment, greatly improving the efficiency of agricultural production and reducing farmers' labor intensity.
In the case of agricultural tractor quality appraisal, Zhongke Testing can provide agricultural tractor quality appraisal services.

is classified according to the traveling device: crawler tractors, walking tractors, and wheeled tractors;
is classified according to the scope of application: ordinary tractors, cultivating tractors, gardening tractors, and special tractors.

GB/T 4269.2-2016 Agricultural and forestry tractors and machinery, lawn and garden power machinery - Symbols for operator control mechanisms and other display devices Part 2: Symbols for agricultural tractors and machinery
GB/T 39517.1-2020 Agricultural and forestry tractors and machinery - Test procedures for agricultural positioning and navigation systems Part 1: Dynamic testing of satellite positioning devices
GB/T 39517.2-2020 Agricultural and forestry tractors and machinery Test procedures for agricultural positioning and navigation systems Part 2: Testing of satellite automatic navigation systems in straight and horizontal operating conditions

The plaintiff purchased an agricultural wheeled tractor from the defendant. Later, due to problems with the tractor's engine, the plaintiff applied to the defendant for repairs. However, after two repairs, the vehicle involved in the case still could not be used normally. Therefore, the plaintiff went to the court to demand compensation.
was entrusted by the court to conduct an appraisal and analysis on "whether there are quality problems" with the agricultural tractor involved in the case.
appraisal analysis results: The
appraisal analysis expert group discussed and comprehensively quality-technically analyzed the relevant information and on-site investigation of the agricultural tractor involved in the case, and made the following suggestions and conclusions:
engine failure (abnormal noise) was caused by insufficient oil pressure in the lubrication system after repairing and replacing the cylinder, and poor lubrication led to damage to the connecting rod bearing.
The specific cause of poor lubrication cannot be determined based on the existing materials and conditions.