We should all know that the hydraulic system is very important for the operation of the vehicle. In the operation process of concrete mixer, if the hydraulic system fails, the operation function of the mixer will be greatly reduced. As long as the owner's friends understand the hydraulic system fault and timely troubleshooting, they can make the mixer normal. Today, Xiaobian collected the causes of insufficient or no pressure in the hydraulic system of automatic concrete mixer, diagnosed and eliminated them for the owners to learn.

如果混凝土攪拌機顯示液壓系統中壓力不足或根本沒有壓力，我們可以根據以下方面進行故障排除：

If the concrete mixer shows insufficient or no pressure in the hydraulic system, we can carry out troubleshooting according to the following aspects:

1.檢查液壓泵是否可以輸出液壓油。如果是沒有液壓油輸出的新型液壓泵，則可能是泵體存在鑄造缺 陷（收縮，沙眼等），因此吸油腔和液壓腔已連接，并且油壓丟失，應及時更換制造商。如果不是新的液壓泵，并且沒有液壓油輸出，則可能無法 正確操縱泵，并且零件可能會嚴重磨損或損壞。及時更換它們。

1. Check whether the hydraulic pump can output hydraulic oil. If it is a new type of hydraulic pump without hydraulic oil output, it may be that the pump body has casting defects (shrinkage, trachoma, etc.), so the oil suction chamber and hydraulic chamber have been connected, and the oil pressure is lost, so the manufacturer should be replaced in time. If it is not a new hydraulic pump and there is no hydraulic oil output, the pump may not be operated correctly and parts may be severely worn or damaged. Replace them in time.

2.如果液壓泵有油輸出，請檢查安 全閥是否正常工作。如果異常，則可能是壓力油回路中的閥因其他原因被污染或阻塞，并且處于回油位置，導致壓力油回路與溢流回路短路，或者管接頭可能松動或受壓。油路中的某些閥泄漏嚴重，或者液壓缸的密封件損壞，導致嚴重泄漏。

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 polluted or blocked due to other reasons, and it is in the oil return position, resulting in the 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 seal of the hydraulic cylinder is damaged, resulting in serious leakage.

清潔方法：打開相關閥門進行清潔，檢查密封間隙和各種密封設備的大小。損壞的密封設備應予以更換。

Cleaning method: open the relevant valve for cleaning, check the sealing clearance and the size of various sealing equipment. Damaged sealing equipment should be replaced.

3.如果液壓泵的輸出流量隨壓力的增加而顯著下降，而壓力未達到規定值，則是由于液壓泵磨損后間隙的增加而引起的。

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

清掃方法：確定液壓泵的容積功率，以確認泵是否可以連續使用。嚴重磨損的零件應修理或更換。

Cleaning method: determine the volume power of the hydraulic pump to confirm whether the pump can be used continuously. Severely worn parts should be repaired or replaced.

4.如果混凝土攪拌機的整個液壓系統能夠建立正常壓力，并且某些管線或液壓缸中沒有壓力，則可能是由于管線，小孔或節流閥，方向閥等引起的。封 鎖此時，應逐一檢查壓力和油的存在，找出原因并進行清理。

4. If the whole hydraulic system of concrete mixer can establish normal pressure, and there is no pressure in some pipelines or hydraulic cylinders, it may be caused by pipelines, small holes or throttle valves, directional valves, etc. At this time, check the existence of pressure and oil one by one, find out the cause and clean up.