1. Check whether the hydraulic pump can output hydraulic oil. If it is a new hydraulic pump that does not output hydraulic oil, the pump body may have casting defects. Therefore, the suction chamber is connected with the hydraulic chamber, the oil pressure is reduced, and the manufacturer shall replace it in time. If it is not a new hydraulic pump and there is no hydraulic oil output, the pump may not operate correctly and parts may be severely worn or damaged.

2.如果液压泵有油输出，请检查安全阀是否正常工作。如果异常，则压力油回路中的阀可能由于其他原因被污染或阻塞，并且处于回油位置，导致压力油回路与溢流回路短路，或者管接头可能松动或受压。油路中的某些阀泄漏严重，或者液压缸和液压马达的密封件损坏，导致严重泄漏。

2. If the hydraulic pump has oil output, please check whether the safety valve works normally. If it is abnormal, the valve in the pressure oil circuit may be contaminated or blocked due to other reasons and be in the oil return position, resulting in a short circuit between the pressure oil circuit and the overflow circuit, or the pipe joint may be loose or pressurized. Some valves in the oil circuit leak seriously, or the seals of the hydraulic cylinder and hydraulic motor are damaged, resulting in serious leakage.

3.如果液压泵的输出流量随压力的增加而显着下降，但压力未达到规定值，则是由于液压泵磨损后间隙的增加所致。

3. If the output flow of the hydraulic pump decreases significantly with the increase of pressure, but the pressure does not reach the specified value, it is due to the increase of clearance after the hydraulic pump is worn.

4.如果全自动自上料搅拌车的整个液压系统能够建立正常压力，并且某些管线或液压缸（或液压马达）中没有压力，则可能是由于管线，小孔或节流阀，方向阀等引起的。进行封锁时，应逐一检查压力和机油以找出原因并进行清理。

4. If the whole hydraulic system of the fully automatic self loading mixer can establish normal pressure and there is no pressure in some pipelines or hydraulic cylinders (or hydraulic motors), it may be caused by pipelines, small holes or throttle valves, directional valves, etc. When blocking, check the pressure and oil one by one to find out the cause and clean it up.