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Incorrect operation and adjustment result in repeated damage to the machine
An Dongfanghong-802 tractor had less than two years of arable land operation. It damaged three gear oil pumps, one hydraulic cylinder, one suspended shaft, and burst several hydraulic hard hoses. Four rakes were severely deformed. It's not a long time. Why did you damage so many components? One of the reasons is the improper operation of the hand plow. It is understood that the operation is as follows: Parking The dispenser handle is pulled from "neutral" to the "floating" position to lower the plow; before the plow is lowered to touch the ground, the reverse handle is pulled back to the "neutral" position to stop the plow from falling; At the beginning, pull the handle slowly to the “pressure drop†position to make the plow slowly touch the ground and reach the tillage depth; then pull the handle back to the “neutral†position to maintain the depth of cultivation. The disadvantages of this method of operation are many: Suddenly stopping the plow's fall can reduce the impact of the plow on the ground, but due to the inertia of the plow, the hydraulic pressure in the lower chamber of the hydraulic cylinder and its connected high-pressure hose can instantly sharply increase. It is easy to introduce damage to hydraulic cylinders and hoses; the handles move slowly between “neutral†and “pressure dropâ€, which can cause the short-term overload of the hydraulic pump, causing early damage to the hydraulic pump and the hard pipe to the distributor. With the handle in the “neutral†position, the plough and the tractor become rigid connections. When the undulating ground works, the depth of the ploughing changes greatly, often causing the tractor to overload, and the operator has to frequently raise the implement to adjust the cultivating depth. Hydraulic systems, suspension mechanisms and ploughs are often subjected to excessive loads and prematurely damaged. It is also known that the second reason for the high number of parts is that the safety opening pressure of the distributor is adjusted too high, which makes the parts lose safety protection. At the same time, the operating temperature of the hydraulic oil is too high (the distributor is hot), resulting in the hydraulic system. Seals are often damaged. When using a four-plow plough with a limited depth wheel, after adjusting the good depth with the depth-limiting wheel, the plough can be quickly pulled from the “neutral†position to the “floating†position when the plow is lowered. Until the plow finishes a journey. If the agricultural implement is descending rapidly, check whether the tubing connection between the hydraulic hoses of the pass-through and lower chambers and the front cover of the cylinder is equipped with a buffer valve, and the joints without buffer valves shall be replaced. The opening pressure of the distributor's safety valve is generally adjusted by the manufacturer and sealed. It is best not to adjust it at will. It can only be adjusted when the farm implement is slowly lifted and the safety valve can be heard to open and drain. Each time try to screw into 0.5-1.0 laps, in order to be able to normally raise the tools in the operation for the sake of avoiding excessive adjustment of the pressure.