搅拌车使用过程中，如果液压系统出现故障会使搅拌车的工作性能大大降低，车主朋友们只有了解了液压系统的故障原因并及时排出故障才能使搅拌车恢复正常，今天收集了有关搅拌车液压系统压力不足或完全无压力的原因、诊断和排除，供车主朋友们参考学习。
In the process of using the mixer, if the hydraulic system fails, the working performance of the mixer will be greatly reduced. Only by understanding the causes of the failure of the hydraulic system and eliminating it in time, can the mixer return to normal. Today, we collected the causes, diagnosis and troubleshooting of the insufficient or no pressure of the hydraulic system of the mixer, for the reference of the owners Learning.
如果混凝土搅拌车出现液压系统压力不足或完全无压力时，我们可以根据以下几个方面依次进行排查：
If there is insufficient or no pressure in the hydraulic system of the concrete mixer, we can check it in turn according to the following aspects:
一、查看液压泵是否能输出液压油。如果是新的液压泵，无液压油输出，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，应及时找厂家更换。若不是新的液压泵，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，及时更换。
1、 Check whether the hydraulic pump can output hydraulic oil. If it is a new hydraulic pump and there is no hydraulic oil output, it may be that the pump body has casting defects (shrinkage cavity, sand hole, etc.), so that the oil suction cavity is connected with the oil pressure cavity and the oil pressure capacity is lost. It should be replaced by the manufacturer in time. If it is not a new hydraulic pump and there is no hydraulic oil output, it may be that the steering of the pump is not right and the parts are seriously worn or damaged, so it should be replaced in time.
二、若液压泵有油液输出，查看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。
2、 If the hydraulic pump has oil output, check whether the relief valve works normally. If it is abnormal, it may be that one of the valves in the pressure oil circuit is stuck in the oil return position due to dirt or other reasons, resulting in a short circuit between the pressure oil circuit and the overflow circuit. It may also be that the pipe joint is loose, or some valves in the pressure oil circuit are seriously leaking, or the seals of the hydraulic cylinder and hydraulic Mada are damaged, resulting in serious leakage.
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。
Troubleshooting: disassemble the relevant valve for cleaning, check the size of the sealing gap and various sealing devices, and replace the damaged sealing device.
三、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。
3、 If the output flow of the hydraulic pump decreases significantly with the increase of the pressure, and the pressure does not reach the specified value, it is due to the increase of the clearance after the wear of the hydraulic pump.
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。
Elimination method: determine the volume efficiency of the hydraulic pump to determine whether the pump can continue to use, and repair or replace the worn parts.
四、若整个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 whole hydraulic system can establish normal pressure, but there is no pressure in some pipelines or hydraulic cylinders (or hydraulic motors), it may be due to blockage of pipelines, orifices, throttle valves, directional valves, etc. At this time, the pressure and oil flow should be checked step by step to find out the cause and eliminate it.
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2022-12-23
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