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）液压泵是否能输出液压油。若无液压油输出，则可能是泵的转向不对，零件磨损严重或损坏：吸油管阻力过大（滤油器阻塞、油液黏度过大等）或漏气。如果是新的液压泵，可能是泵体有铸造缺陷（缩孔、砂眼等），使吸油腔和压油腔相通，失去压油能力，输入功率不足，使泵的输油压力达不到工作压力，泵轴扭断，而输不出油。

(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.

若液压泵有油液输出，则应检查各回油管，观察哪个部件溢油。如溢流阀回油管溢油，可能是调定压力低。此时，拧紧溢流阀调压弹簧，若压力无变化，则可能是溢流阀主阀芯或先导部分的锥阀因脏物或锈蚀而卡死在开口位置；或因弹簧折断失去作用；或因阻尼孔被脏物堵塞，泵输出的油液立即经溢流阀流回油箱。排除方法：应拆开溢流阀，加以清洗。检查或更换弹簧，恢复其工作性能。

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）溢流阀工作是否正常。若不正常，则可能是压力油路中的某个阀有污物或其他原因卡住，处于回油位置，致使压力油路与溢流回路短路，也可能是管接头松脱，或处于压力油路中的某些阀泄漏严重，或液压缸、液压马达的密封损坏，严重泄漏。排除方法：拆开有关阀进行清洗，检查密封间隙的大小及各种密封装置，密封装置损坏应更换。

(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）若液压泵输出流量随压力升高而显着减小，且压力达不到规定值，则是由于液压泵磨损后间隙增大所致。排除方法：测定液压泵的容积效率，即可确定该泵是否能继续使用，对磨损严重的零件，应进行修配或更换。

(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）若整个全自动上料搅拌车液压系统能建立正常压力，而某些管路或液压缸（或液压马达）中无压力，则可能是由于管路、小孔或节流阀、换向阀等部位堵塞。此时，应逐段检查压力和有无油液通过，找出原因，加以排除。

(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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