The non-demolition inspection method is a practical technique for judging tractor failure without disassembling the machine. This method can avoid the loss and waste caused by the blind disassembly, which is a good method for high efficiency and low consumption. The seven types of non-demolition inspection methods that are commonly used are described below: 1. Observation Method: To determine whether the machine is faulty by looking at the appearance of the machine. Such as exhaust pipe smoke color; whether the appearance of the machine "four leakage" phenomenon; oil temperature, oil pressure is normal; whether the light is bright, the speaker is crisp and so on. Second, the touch method: the use of the sense of smell and hand touch judgment, analysis of the cause of the failure. If you touch the bearing shell, feel the temperature change; touch the high pressure tube to feel the pulsation strength of the oil pressure; the nose olfactory friction sheet has no burning odor and so on. Third, the auscultation method: use a dedicated stethoscope or a long screwdriver to select the appropriate location for auscultation. The auscultation site should generally be selected on the side of the housing of the auscultation part. The various mating parts of tractors move with each other, and the sounds emitted when tapping can usually be distinguished: small parts touch small parts with small sound, crisp and sharp; large parts touch large parts with loud and heavy sound; small parts touch large parts, like The hammer strikes the anvil; the shaft collides with the bearing, and the sound is dull. Fourth, the heuristic method: When it is suspected that the fault is in a certain location, but cannot be completely affirmed, a heuristic inspection is performed on the suspected component, and the true cause of the fault is determined according to the change of the fault sign after the exploratory inspection. For example, in order to diagnose the cause of the “black smoke†of the exhaust pipe, the pilot pressure is adjusted to adjust the value of the injector. If the “black smoke†sign disappears after the pressure of the injector is increased, it can be concluded that the cause of the fault is spurt. The grease pressure is too low. Fifth, the broken cylinder method: In order to stop the supply or ignition of a cylinder, observe the changes in the symptoms of failure to determine which cylinder has failed. Sixth, change the law: When analyzing the fault, there is suspicion to a certain part or part, replace it with the spare parts with good technical condition, and then according to the change of signs before and after the change of parts, it is clear that the technical status of the original part is normal. For example, the hydraulic suspension mechanism cannot be lifted, and it is suspected that the fault is in the sub-sprayer. Therefore, a sub-nozzle with a good technical condition is put on the test. If it cannot be lifted, the fault is not in the distributor. VII. Screening method: It is troublesome to check or check some inconveniences. There is no failure factor of the inspection method. It does not directly check, but it is checked through other failure factors in order. The last thing is the real failure. the reason.
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