20V4A-1C22R

 20V2A   叶片泵
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20V4A
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20V5A
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20V6A
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20V7A
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20V8A 
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20V9A
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20V10A 
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20V11A
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20V12A 
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20V14A
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25V10A
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25V12A 
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25V14A
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25V15A
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25V17A
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25V19A
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25V21A 
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35V21A
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35V25A
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35V30A
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35V32A 
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35V35A
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35V38A
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45V42A
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45V45A
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45V50A 
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45V57A 
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45V60A
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45V66A 
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45V76A 
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2520V双联    
3525V双联
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4535V双联
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 45V76A-86A22R
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45V76A-86D22R

液压系统进人空气后，会使液压油发生“乳化”现象，破坏油液的性能。进人油液中的空气体积随系统压力、温度的变化而变化，阻碍液流的运动，因此使液压执行元件在作业中出现忽停忽动、速度缓慢、力量不足等现象，通常我们把这种现象称之为“工作爬行”。爬行现象不但破坏液压系统工作的稳定性，有时甚至引起振动，产生噪声。
因此，必须严防空气进人液压系统，具体办法如下： 
（l）吸油管路及泵的驱动轴轴端密封处等低于大气压的部位，应注意不要漏气。 
（2）防止回油管口油时带人空气，不要使回油管露出油箱的表面。 
（3）如系统已进人空气，应及时查出漏气部位进行排除。并把进人系统的空气排除掉。 
（4）加人新油后，应连续操纵工作装置提升、下降、翻转，以便排除系统内的空气。 正确执行操作规程、防止操作粗暴和随意操作作业 。     
 在进行挖掘、回转、铲推、举升等作业的操作时，动作一定要平稳准确，收放操纵杆及时，避免过猛过快，以免突然打开或关闭液压缸和液压马达等执行机构进、出油口时，产生压力冲击，导致各部油封加速损坏、高压软管起泡破裂、管接头处松动渗漏，甚至还可能使溢流阀因瞬时开启过大而使阀芯卡死，发生内漏，造成作业无力，工作效率降低，使用寿命缩短。加强液压系统的日常维护和保养 。 
液压系统的冲洗的意义及方法
液压系统清洗的意义
从使用的角度看，液压系统正常工作的首要条件是系统内部必须清洁。在新的设备运行之前,或一台设备经过大修之后,液压系统遭到污染是不可避免的,在软管、管道和管接头的安装过程中都有可能将污染物带入系统。即使新的油液也会含有一些令人意想不到的污染物。必须采取措施尽快将污染物滤出,否则在设备投入运行后不久就有可能发生故障,而且早期发生的故障往往都很严重,有些元件例如泵、马达有可能会遭到致命性的损坏。
系统冲洗的目的就是消除或较大限度地减少设备的早期故障。冲洗的目标是提高油液的清洁度,使系统油液的清洁度保持在系统内关键液压元件的污染耐受度内，以保证液压系统的工作可靠性和元件的使用寿命。