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Shanghai -50 tractor hydraulic pump main control valve easy to stagger the main reason: First, hydraulic devices and gearbox, rear axle shared oil, gear collision and wear debris generated by the iron and other impurities easy to use oil contaminated; the second is the Machine allows the suspension mass of 300kg, the actual use of rotary tiller or straw machine, and then with the pressure roller, the mass is often between 400-500kg, resulting in a large pressure control valve. To reduce the main control valve stuck fault measures: â‘ change the oil must be within the bridge, the pump completely clean with gasoline, be sure to put the gearbox oil clean and wash with diesel. â‘¡ check the pendulum and the square lining, pin and connecting rod, connecting rod and spring sleeve and valve stem and whether the Kuang Kuang or slippery, if necessary, should be repaired. â‘¢ main control valve into the oil hole back easy to accumulate impurities, work and partial pressure, valve and valve sleeve contact area, easy to make the swing mechanism slip and stuck. We will control the main valve into the hole back to wear shallow groove, so that the pressure evenly around the valve, valve and valve sleeve to reduce the friction area, so reduce the swing resistance, which greatly reduces the main control valve stuck so.