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A look at whether the hydraulic pump can output hydraulic oil. If there is no hydraulic oil output, it may be: the wrong direction of the pump; serious wear or damage to the parts; excessive resistance of the suction pipe (filter plug, oil viscosity, etc.) or leakage. If it is a new pump, it may be that the pump body has casting defects (such as sand holes, etc.) that make the suction chamber communicate with the pressure chamber and lose the ability to press oil; the input power of the pump is not enough or the pump shaft is broken, so that the pump output oil pressure Do not reach working pressure or lose oil.
If the hydraulic pump has an oil output, check the return lines to see which component is spilling. If spilled oil overflow pipe, it may be caused by the valve set pressure is low. At this time, the pressure relief spring of the overflow valve can be tightened. If the pressure does not change, there may be dirt on the poppet of the overflow valve main valve or the pilot part or be stuck in the opening position due to corrosion; or the spring may break. Loss of effect; or because the orifice is blocked by dirt, the oil output from the pump flows directly back through the relief valve to the tank, resulting in insufficient or no pressure. Remedy is to remove the relief valve and clean it; check or replace the spring to restore its performance.
Second, see if the overflow valve is working properly. If it is not normal, a valve in the pressure oil path may be contaminated or other reasons may be stuck in the oil return position, so that the pressure oil path communicates with the overflow circuit. It may also be that the fittings are loose, or that some of the valves in the pressure circuit are leaking badly, or the seals of hydraulic cylinders and hydraulic motors are damaged, causing serious leakage. The exclusion method is to disassemble the relevant valve for cleaning, check the size of the sealing gap and various sealing devices. If the seal is damaged, it should be replaced.
Look at the output flow of the hydraulic pump. If the flow decreases significantly with increasing pressure, and the pressure does not reach the specified value, it is due to the increased clearance after the hydraulic pump wears. Remedy: Determine the volumetric efficiency of the hydraulic pump to determine if the pump can continue to be used. For parts that are heavily worn, repair or replacement should be performed.
Fourth, see if the entire hydraulic system can establish normal pressure. Some pipes or hydraulic cylinders (hydraulic motors) have no pressure, and may be caused by blockage of components such as piping, throttle valves, and reversing valves. Pressure should be checked paragraph by paragraph and whether there is oil through, find out the reasons for exclusion.
Diagnostic method of insufficient pressure in hydraulic system of dry granulator
When the hydraulic system is under pressure or completely without pressure, diagnosis can be made as follows.