Under a certain pressure, the small concrete mixer has the function of pressure, will produce a certain power and start its operation, so that the concrete above can be mixed more fully. On the premise of insufficient pressure, it may affect the efficiency of the mixer. So how to solve the problem of insufficient pressure?

1、查看小型混凝土攪拌車液壓泵是否能輸出液壓油，如果是新的液壓泵，無液壓油輸出，可能是泵體有鑄造缺陷(縮孔、砂眼等)，使吸油腔和壓油腔相通，失去壓油能力，應及時找廠家更換，若不是新的液壓泵，無液壓油輸出，可能是泵的轉向不對，零件磨損嚴重或損壞，及時更換。

1. Check whether the hydraulic pump of small concrete mixer truck 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.), which connects the oil suction chamber with the oil pressure chamber and loses the oil pressure capacity. 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 direction of the pump is wrong, If the parts are seriously worn or damaged, replace them in time.

2、若小型混凝土攪拌車液壓泵有油液輸出，查看溢流閥工作是否正常。若不正常，則可能是壓力油路中的某個閥有污物或其他原因卡住，處于回油位置，致使壓力油路與溢流回路短路，也可能是管接頭松脫，或處于壓力油路中的某些閥泄漏嚴重，或液壓缸、液壓馬達的密封損壞，嚴重泄漏。排除方法是拆開有關閥進行清洗，檢查密封間隙的大小及各種密封裝置，密封裝置損壞應更換。

2. If the hydraulic pump of small concrete mixer truck has oil output, 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. The troubleshooting method is to disassemble the relevant valves for cleaning, check the size of sealing clearance and various sealing devices, and replace the damaged sealing devices.

3、若水泥小型混凝土攪拌車的液壓泵輸出流量隨壓力升高而顯著減小，且壓力達不到規定值，則是由于液壓泵磨損后間隙加大所致。排除方法是測定液壓泵的容積效率，即可確定該泵是否能繼續使用，對磨損嚴重的零件，應進行修配或更換。

3. If the output flow of the hydraulic pump of the small cement concrete mixer 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 hydraulic pump is worn. The elimination method is to measure the volumetric efficiency of the hydraulic pump to determine whether the pump can continue to be used. The severely worn parts should be repaired or replaced.

4、小型混凝土攪拌車的液壓系統能建立正常壓力，而某些管路或液壓缸中無壓力，可能是由于管路、小孔或節流閥、換向閥等部位堵塞。此時應逐段檢查壓力和有無油液通過，找出原因，加以排除。

4. The hydraulic system of small concrete mixer can establish normal pressure, but there is no pressure in some pipelines or hydraulic cylinders, which may be due to the blockage of pipelines, small holes, throttle valves, directional valves and other parts. At this time, check the pressure and oil passage section by section, find out the cause and eliminate it.

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