1： The insufficient oil supply of large concrete mixer leads to low output speed and torque
办法：供油液压泵吸油口过滤器堵塞，此时可清洗滤油器；油液钻度过大，此时可更换适合的油液；轴向或径向间隙过大等原因等造成，此时要研磨定子或其他有关零件，使轴向间隙符合要求。
Solution: if the filter at the oil suction port of the oil supply hydraulic pump is blocked, the oil filter can be cleaned; if the oil drill is too large, the suitable oil can be replaced; if the axial or radial clearance is too large, the stator or other relevant parts should be ground to make the axial clearance meet the requirements.
二：大型混凝土搅拌机液压马达的原动机功率或转速不当导致输出转速和输出转矩低
2： The output speed and torque of hydraulic motor of large-scale concrete mixer is low due to improper power or speed of prime mover
办法：原动机功率不匹配，此时需要更换原动机，使之与液压泵功率匹配；原动机转速低于额定转速，此时可选用转速满足要求的原动机。
Solution: if the prime mover power does not match, the prime mover needs to be replaced to match the power of the hydraulic pump; if the prime mover speed is lower than the rated speed, the prime mover with the rotational speed meeting the requirements can be selected.
三：大型混凝土搅拌机各连接处密封不严，有空气混入
3： The joints of large-scale concrete mixer are not tightly sealed and air is mixed in
办法：检查和紧固各连接处，提高密封性能。
Solution: check and tighten the joints to improve the sealing performance.
四：工作介质污染，液压马达内部通道被堵塞
4： The working medium is polluted and the internal channel of hydraulic motor is blocked
办法：拆解，仔细清洗并更换清洁的工作介质。
Solution: disassemble, carefully clean and replace clean working medium.
五：大型混凝土搅拌机配流盘和叶片磨损，内泄漏大
5： The valve plate and blade of large concrete mixer are worn and the internal leakage is large
办法：修复或更换有关零件。
Solution: repair or replace the relevant parts.
六：大型混凝土搅拌机液压系统中单向阀密封不良
6： Poor sealing of check valve in hydraulic system of large concrete mixer
办法：修理单向阀阀座或更换有关零件，使阀座与钢球严格密合。
Solution: repair the check valve seat or replace the relevant parts, so that the valve seat and steel ball are tightly closed.
七：液压系统中溢流阀失灵
7： Overflow valve failure in hydraulic system
办法：修理或更换溢流阀。
Solution: repair or replace the relief valve.
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