The hydraulic system of Dongfanghong-75/802 tractor often has the problem that the return valve does not close tightly, resulting in failure of the agricultural implement to be upgraded. The analysis is as follows. First, determine the failure of the handle to pull the handle to the "lift" position, if the farm tool can not be upgraded, and the hydraulic oil tank inside the oil spill back and forth, it shows that the return valve is not strict. Second, the common cause of this failure 1, hydraulic oil dirty, so that stuck back oil valve in the open position. 2. The back surface of the oil return valve cone is lifted by the stolen goods. 3. The choke orifice of the oil return valve is blocked, so that when the slide valve is in the “up†or “pressure drop†position, the return valve opens under the effect of the pressure difference between the upper and lower pressures. 4, the back valve seal cone and valve seat seal ring wear 5, return valve spring deformation or folding section, 6, the return valve guide wear, work deviation, not close strict. Third, the troubleshooting method When this failure occurs, you can try a wooden stick and other tools to knock back the oil valve, if still can not be ruled out, you need to open the fuel valve cover, remove the return valve and guide sleeve for cleaning. At the same time, check whether the throttle orifice and the balance hole of the oil return valve are clogged, and whether the oil return valve seat seal ring band contains debris or not. If necessary, remove it.
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