1. If the hydraulic pump of the charging mixer has oil output, we can timely check whether it works normally. If it is abnormal, it may be that a certain equipment accessory in the pressure oil circuit is stuck for other reasons and is in the place where the oil is returned, resulting in the short circuit of the pressure oil circuit and overflow circuit, or the loosening of the pipe joint. When some equipment in the oil circuit leaks seriously, or the seal of the hydraulic cylinder and hydraulic motor is damaged. The way to eliminate this problem is to directly disassemble the relevant equipment for cleaning, and to see if the corresponding equipment is damaged, it is necessary to replace it, and to check the inspection.

2、看自上料搅拌车液压泵是不是能输出液压油呢。如果说是新的液压泵，没有液压油，可能是泵体有缺陷，让吸油腔和压油腔有相通的情况发生，失去压油能力，应及时厂家更换。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。

2. See whether the hydraulic pump of the charging mixer can output hydraulic oil. If it is a new hydraulic pump, and there is no hydraulic oil, it may be that the pump body has defects, so that the oil suction chamber and the pressure oil chamber are connected, and the oil pressure capacity is lost, it should be replaced by Lu Zun machinery manufacturer in time. If it is not a new hydraulic pump and there is no hydraulic oil output, it may be that the steering direction of the pump is not correct and the parts are seriously worn or damaged. Replace them in time.

3、水泥自动搅拌车的液压系统能建立正常压力，一些管路或者液压缸中间是没有压力的，可能就是因为管路、小孔或节流阀、换向阀这些部位堵住了。所以要仔细查看检查压力有没有油液通过，找出原因，然后来排除。

3. The hydraulic system of the concrete mixer truck can establish normal pressure. There is no pressure in some pipelines or hydraulic cylinders. It may be because the pipeline, small hole, throttle valve and reversing valve are blocked. So check the pressure carefully to see if there is any oil passing through, find out the reason, and then eliminate it.

4、若水泥自动搅拌车的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。排除方法是测定液压泵的容积效率，就可以确定这个泵是不是能继续使用的，对磨损严重的产品，一定进行修配或更换。

4. If the output flow of the hydraulic pump of the concrete mixer truck decreases significantly with the increase of the pressure, and the pressure can 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, which can determine whether the pump can continue to be used, and the seriously worn products must be repaired or replaced.