After the machine enters normal operation after running-in and trial operation, its technical status gradually changes during the long-term production process: the previously tightened mating parts may become loose again, and the mating clearance between moving parts may become larger and the lubricating oil becomes dirty due to normal grinding and twisting. In the future, the machine will not be able to continue normal operation, and even cause significant damage. Maintenance is to tighten and adjust the parts that should be tightened and adjusted before the normal technical state of the machinery is damaged, replace the lubricating oil, maintain normal lubrication conditions, and ensure that the machinery always works in good technical state. Only in this way can the service life of the machinery be extended, ensuring high-quality and efficient operation

According to the working characteristics of agricultural machinery, maintenance work should include the following contents:

1. Agricultural machinery generally operates in dusty or muddy environments, and the bearings at lubrication points are mostly without sealing devices in structure. Some parts and components are still exposed outside, so it is necessary to regularly remove dust and soil, replenish clean lubricating oil, and replace twisted lubrication devices (yellow nozzles).

2. The working components of agricultural machinery are directly in contact with working objects such as soil, grains, and stems, so their wear is faster. If the blades are not polished or worn parts are not replaced in a timely manner during maintenance, it will significantly increase the working resistance and reduce production efficiency. For example, in general, plows and birches must work 1-2 shifts before grinding the edges, and the flat teeth of the claw crusher must be replaced with a new product after crushing 300000 kilograms of material.

3. The technical status of agricultural machinery directly affects the operation quality of the machinery. For example, when using plows with bent plow beams or improperly adjusted traction lines, the unevenness of the trench bottom can vary by as much as 6-8 centimeters. So during maintenance, it is necessary to inspect and adjust various parts, and if any parts or components do not meet the technical requirements, they should be removed for correction or replacement.