1、液压系统中，固体颗粒污染会导致：加剧液压元件的表面腐蚀和磨损，增大***量，油温升高、压力降低、效率低、响应慢、不稳定、改变运动方向，运动速度减低，承载能力下降，阀芯卡死，烧毁电磁线圈。
2、液压系统中，水污染会导致：油变质(如添加剂析出及油的氧化)，润滑油膜变薄，腐蚀并加速金属表面疲劳失效，低温产生冷却、淤塞运动元件，绝缘油的绝缘强度降低。
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