工程机械液压缸推力不足故障的原因主要有:液压泵性能差,供油量不足(应先查液压油数量和质量,再查液压泵供油情况,最后查发动机是否转速不够);液压缸进油路泄漏(应排除管路泄漏,检查溢流阀的密封情况);液压缸内、外泄漏严重 (应更换密封件);由于缸筒加工精度不够,造成其运动速度随行程位置不同而有所 Construction machinery hydraulic cylinder thrust insufficient failure are: hydraulic pump performance is poor, insufficient fuel supply (should check the hydraulic oil quantity and quality, and then check the hydraulic pump fuel supply, and finally check the engine speed is not enough); hydraulic cylinder into Leakage of the oil pipe should be ruled out, check the sealing condition of the relief valve; Serious leakage inside and outside of the hydraulic cylinder (seal should be replaced); As the cylinder processing accuracy is not enough, the movement speed is different with the stroke position The