(1) Insufficient pressure or no pressure in the hydraulic system of mixing machinery: when the hydraulic pump can not pump out pressure or the pressure is insufficient, it is mostly caused by the wrong steering of the hydraulic pump or the low speed of the pump. At this time, it is necessary to change the steering of the hydraulic pump or detect whether the transmission system of the hydraulic pump is normal. When the viscosity of the hydraulic oil decreases, the volumetric efficiency of the whole system will decrease. At this time, the hydraulic oil should be replaced to ensure that its viscosity meets the requirements of the system.

(2)搅拌机械液压系统流量小、不出油：液压泵如果正常的旋转但是没有液压油输出时，一般是因为油箱内油量较少、吸油滤油器或者是吸油箱发生堵塞、吸油管内有压缩空气、液压油黏度太高、油泵不能正常吸油等原因造成的。发生上述故障现象时，应该适当的加油，同时清洗油路。

(2) Mixing machinery hydraulic system flow is small, no oil: if the hydraulic pump rotates normally, but there is no hydraulic oil output, it is generally caused by less oil in the oil tank, oil suction filter or oil suction tank blockage, compressed air in the oil suction pipe, too high viscosity of hydraulic oil, oil pump can not normally absorb oil and other reasons. In case of the above faults, oil should be added properly and the oil circuit should be cleaned at the same time.

(3)搅拌机械液压系统流量脉动、压力波动：搅拌机的液压系统出现脉动或者压力不平衡的现象时，有可能是因为系统内吸入了空气造成的。此时需要及时的检查油箱，保证液压油内没有泡沫，如果出现泡沫，则应该及时地清洗油路，更换液压油，同时保证整个油路内没有漏气发生间。

(3) Flow pulsation and pressure fluctuation of hydraulic system of mixing machine: when pulsation or pressure imbalance occurs in the hydraulic system of mixer, it may be caused by air inhalation in the system. At this time, we need to check the fuel tank in time to ensure that there is no foam in the hydraulic fluid. If there is a bubble, we should clean the oil well in time, replace the hydraulic oil, and ensure that there is no leakage in the whole oil circuit.

(4)搅拌机械液压系统运作时噪音严重：搅拌机械的液压系统出现噪音说明，液压系统的管道、油泵等硬件，存在空气、空吸等问题。及时查看搅拌机械油箱，是否油量超出范围、液压硬件与系统连接头的密封。适量减少增、加油液保持在油箱内的规定刻度内、检查各个密封部件的损耗程度、清理吸油过滤器或吸油管的异物、调整液压油油泵的转速、更换液压油、预热处理等方案进行保养与维护。

(4) Mixing machinery hydraulic system operation noise is serious: mixing machinery hydraulic system noise, hydraulic system pipeline, oil pump and other hardware, there are air, air suction and other problems. Timely check the mixing machine oil tank, whether the oil volume is out of range, and the sealing of hydraulic hardware and system connector. It is necessary to reduce the amount of oil, keep the oil in the specified scale of the oil tank, check the loss degree of each sealing part, clean the foreign matters in the oil suction filter or oil suction pipe, adjust the speed of the hydraulic oil pump, replace the hydraulic oil, and preheat the oil.

(5)搅拌机械液压系统操作阀跳动：当使用油液时间过长、受污染时，油泵与控制阀硬件内的污物会大量堆积，使液压系统运作效率大大降低，造成液压硬件损坏、滑阀回味弹簧形变等问题。要及时检查、更换其元件，避免在路桥施工中，发生搅拌机械液压系统操作阀跳动的问题而影响作业安全。

(5) The operation valve of the hydraulic system of the mixing machine jumps: when the oil is used for a long time and polluted, a large amount of dirt will accumulate in the hardware of the oil pump and control valve, which greatly reduces the operation efficiency of the hydraulic system, and causes damage to the hydraulic hardware, aftertaste of the slide valve, spring deformation and other problems. It is necessary to check and replace its components in time, so as to avoid the problem that the operation valve of the hydraulic system of the mixing machine jumps during the road and bridge construction, which will affect the operation safety.

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