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. 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. 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. 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.