The causes, diagnosis and troubleshooting of insufficient or no pressure in the hydraulic system of the full-automatic feeding mixer can be carried out according to the following aspects:
(1) Whether the hydraulic pump can output hydraulic oil. If there is no hydraulic oil output, it may be that the steering of the pump is wrong, the parts are seriously worn or damaged: the resistance of the oil suction pipe is too large (the oil filter is blocked, the oil viscosity is too large, etc.) or there is air leakage. If it is a new hydraulic pump, the pump body may have casting defects (shrinkage cavity, sand hole, etc.), so that the oil suction chamber and oil pressure chamber are connected, the oil pressure capacity is lost, and the input power is insufficient, so that the oil delivery pressure of the pump can not reach the working pressure, the pump shaft is twisted and cannot deliver oil.
If the hydraulic pump has oil output, check each oil return pipe and observe which part overflows. If the oil return pipe of the overflow valve overflows, the set pressure may be low. At this time, tighten the pressure regulating spring of the overflow valve. If the pressure does not change, the cone valve of the main valve core or pilot part of the overflow valve may be stuck in the opening position due to dirt or corrosion; Or loss of function due to spring breaking; Or because the damping hole is blocked by dirt, the oil output by the pump immediately flows back to the oil tank through the overflow valve. Troubleshooting: disassemble the overflow valve and clean it. Check or replace the spring to restore its working performance.
(2) Check whether the overflow valve works normally. If it is abnormal, it may be that a valve in the pressure oil circuit is stuck due to dirt or other reasons and is in the oil return position, resulting in a short circuit between the pressure oil circuit and the overflow circuit, or the pipe joint is loose, or some valves in the pressure oil circuit leak seriously, or the seals of the hydraulic cylinder and hydraulic motor are damaged and leak seriously. Troubleshooting: disassemble relevant valves for cleaning, check the size of sealing gap and various sealing devices, and replace the damaged sealing device.
(3) If the output flow of the hydraulic pump decreases significantly with the increase of pressure, and the pressure cannot reach the specified value, it is due to the increase of clearance after the hydraulic pump is worn. Troubleshooting: determine the volumetric efficiency of the hydraulic pump to determine whether the pump can continue to be used. Repair or replace the severely worn parts.
(4) If the hydraulic system of the whole automatic feeding mixer truck can establish normal pressure, but there is no pressure in some pipelines or hydraulic cylinders (or hydraulic motors), it may be due to the blockage of pipelines, small holes, throttle valves, directional valves, etc. At this time, check the pressure and oil passage section by section, find out the cause and eliminate it.
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