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挖掘機掉臂7大原因，5種解決方法！

發布時間：2019-04-23

瀏覽量：2413

在開挖掘機經常會出現大大小小的毛病，出現故障真叫人頭疼！不知道學員們遇沒遇到過挖掘機掉臂的情況呢？到底你的愛機為啥會掉臂？出現掉臂故障又該如何解決呢？讓我們百瑞培訓學校資深教練教教大家遇到這些問題，該如何解決！

什么是挖掘機掉臂？

挖掘機掉臂也有人稱它為吊臂、自落、跌泵等等。簡單來講，掉臂其實就是挖掘機動臂無力的一種表現，當動臂抬

起后，在不用操作桿控制的情況下，大臂或小臂會出現自動下落的現象。

當挖掘機出現掉臂故障的時候，也會出現不同的表現形式，故障現象大致可以分為大臂掉臂、小臂掉臂、中臂掉臂、冷車正常熱車掉臂等等。

掉臂故障7點常見原因：

1.液壓油故障引起的掉臂。冷車正常熱車掉臂，很有可能就是液壓油有問題。

2.挖掘機的液壓油缸出現故障，尤其是油缸油封損壞或老化，造成油封內漏引起的。

3.分配閥閥孔阻塞、閥芯磨損、閥芯間隙過大、分配閥主安全閥磨損損壞，引起的大小臂吊臂。

4.當大小臂安全溢流閥油封破損時，造成一定的泄漏，也會導致掉臂現象。

5.分配泵密封不良造成的，也稱之為“卸油"，這時需要將分配泵的密封圈更換。

6.液壓泵比例電磁閥接頭接觸不良，也會引起大小臂掉臂現象。

7.嚴重掉臂（油溫45℃左右,5分鐘斗齒下降超過95mm），最有可能是主閥被卡導致的。

挖掘機掉臂該怎么辦？

1.檢查挖機作業環境溫度，是否存在液壓油型號選用不當情況，是否使用了劣質液壓油。

2.出現掉臂故障時，可以先將動臂壓力調小，仔細觀察動臂是夠很快下落。

3.檢查液壓油缸、油缸油封有沒有故障，油封密封不良會漏油，要及時更換油封。

4.更換油封后，如果還掉臂，要檢查分配閥以及動臂回油安全閥等。

5.檢查挖掘機主液壓泵的工作壓力和先導壓力是否符合要求。

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挖掘機掉臂7大原因，5種解決方法！