During the operation of a tractor, wear and aging of its components are inevitable, leading to deterioration of its technical condition, decreased power, increased fuel consumption, and continuous occurrence of faults. In order to prevent malfunctions, timely and correct maintenance and upkeep of the tractor is necessary to extend its service life and reduce operating costs. In the process of conducting technical status research on agricultural tractors, it was found that the maintenance and upkeep of some parts did not receive the necessary attention, resulting in many adverse consequences.
Neglecting the maintenance of diesel filters
The diesel filter has always played the role of a scavenger, and its main function is to filter out particulate impurities and water in the diesel, ensuring the normal operation of the engine. But there are also many diesel car drivers who believe that each time the diesel is added, it undergoes long-term sedimentation, and the impurities and water in the oil are already very clean. Therefore, they choose to give up installing or not maintaining the diesel filter for a long time. In fact, this often results in small losses.
Diesel filters are generally used for 200-300 hours, and the filter element should be inspected, cleaned, or replaced. Please note the following points:
(1) The sealing parts of the air filter assembly are not allowed to have air leakage. When installing the sealing ring, do not twist it and install it firmly.
(2) Regularly clean the filter element. Paper filter elements cannot be cleaned with diesel, but must be brushed with a soft bristle brush or blown back by an air cylinder. If the filter element is cracked or blocked, it should be replaced. The oil bath type air filter should be regularly replaced with engine oil, the oil pan should be cleaned, and the oil should be filled to an appropriate height, not too full or too little.
(3) After disassembling and maintaining the filter, reassembling it and installing it on the tractor, it is necessary to release all the air in it.
2. The valve spring is not replaced for a long time
Due to the high temperature experienced by valve springs, long-term non replacement can easily lead to annealing, resulting in insufficient elasticity. At the same time, due to the constant alternating stress on the valve spring, long-term non replacement can lead to plastic deformation, resulting in a shortened free length and insufficient elasticity. The result of insufficient elasticity will inevitably lead to delayed valve action and delayed closure, as well as lax valve closure, resulting in insufficient cylinder pressure.
3. Neglecting the maintenance of small holes
(1) Do not attach importance to the role of starting the nozzle. Long term failure to remove carbon deposits from the starting nozzle may result in blockage or blockage of the nozzle. The function of the starting nozzle is to enable diesel to be directly injected into the cylinder through the nozzle earlier, and first ignite and burn in the main combustion chamber to increase the temperature inside the cylinder and improve the combustion conditions of the mixed gas in the main combustion chamber. Therefore, if the starting nozzle is not smooth or blocked, it will worsen the starting conditions and cause difficulty in starting.
(2) Fuel tank cap vent. After the hole is blocked, the fuel tank is no longer connected to the atmosphere, and negative pressure will appear on the upper part of the fuel tank due to the decrease in oil level, causing fuel supply interruption; After the fuel is heated, it evaporates, causing an increase in pressure inside the fuel tank, which can cause oil leakage at the fuel tank switch. Therefore, this hole cannot be blocked.
(3) Crankcase air change hole. When the engine is working, a certain amount of exhaust gas always leaks into the crankcase through the piston rings. The oil engine has been in use for a long time, and as the wear of the cylinder liner and piston rings increases, the gap increases, the elasticity of the piston rings decreases, and more exhaust gas leaks into the crankcase. After the air vent is blocked, more and more exhaust gas accumulates in the crankcase, resulting in an increase in air pressure inside the crankcase