What to do if there is no pressure on the 12-ton crane hydraulic system
When using a 12-ton crane, it is necessary to operate in accordance with the operating specifications so as to extend the life of the crane. If there is no pressure on the hydraulic system of the 12-ton crane, what is the solution?
1. The opening pressure of the relief valve is too low. The hydraulic system of the 12-ton crane is an open series oil circuit. The overflow branch leg hydraulic cylinder oil circuit in the two-way valve prevents overload. Adjust the system relief valve to 16Mpa according to technical regulations. If the opening pressure of the relief valve of the hydraulic system is too low, the above-mentioned failure will be caused. There is also an overflow valve in the quadruple valve to prevent the overload of the hydraulic circuit of the lifting, swinging, luffing and boom boom telescopic mechanism, protecting it from damage.
2. Leakage in the four-way reversing control valve The oil seal of the slide valve stem O-ring seal in the four-way reversing control valve is damaged or worn. The valve stem clearance exceeds 0.03mm, the leakage in the valve increases, which also causes 12 tons of crane One of the factors that can not go up in the hydraulic system pressure.
3. There is not enough oil in the fuel tank and the liquid level is low. The reason is relatively straightforward, and it is easy to rule out. As long as the pressure can reach 17MPA, it means that there is no blockage of the suction pipe. Editor: A