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。

When an excavator experiences arm drop failure, different manifestations can also occur, and the fault phenomenon can be roughly divided into arm drop of the upper arm, arm drop of the lower arm, arm drop of the middle arm, arm drop of the cold vehicle and normal hot vehicle, etc.

掉臂故障7點常見原因

7 Common Causes of Arm Drop Fault

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。

1. Arm drop caused by hydraulic oil failure. If the cold car is normal and the hot car falls off, it is very likely that there is a problem with the hydraulic oil.

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。

2. The hydraulic cylinder of the excavator malfunctions, especially when the oil seal of the cylinder is damaged or aged, resulting in internal leakage of the oil seal.

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

3. Blockage of the distribution valve hole, wear of the valve core, excessive clearance between the valve cores, and wear and damage to the main safety valve of the distribution valve, resulting in the suspension of the large and small arms.

4.當大小臂溢流閥油封破損時，造成一定的泄漏，也會導致掉臂現象。

When the oil seal of the safety relief valve for the large and small arms is damaged, it can cause certain leakage and also lead to arm dropping.

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。

5. Due to poor sealing of the distribution pump, also known as "oil unloading", the sealing ring of the distribution pump needs to be replaced.

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。

6. Poor contact of the hydraulic pump proportional solenoid valve connector can also cause the phenomenon of large and small arms falling off.

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

7. Severe arm drop (oil temperature around 45 ℃, bucket teeth dropping more than 95mm in 5 minutes) may be caused by the main valve being stuck.

挖掘機掉臂該怎么辦？

What should I do if an excavator loses its arm?

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。

1. Check the working environment temperature of the excavator to see if there is any improper selection of hydraulic oil models and if inferior hydraulic oil has been used.

2.出現掉臂故障時，可以先將動臂壓力調小，仔細觀察動臂是否很快下落。

When an arm drop fault occurs, you can first reduce the pressure on the boom and carefully observe whether the boom drops quickly.

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。

3. Check if there are any faults in the hydraulic cylinder and oil seal. Poor oil seal can cause oil leakage, so it is necessary to replace the oil seal in a timely manner.

4.更換油封后，如果還掉臂，要檢查分配閥以及動臂回油閥等。

After replacing the oil seal, if the arm still falls out, check the distribution valve and the boom return oil safety valve.

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。

5. Check whether the working pressure and pilot pressure of the excavator's main hydraulic pump meet the requirements.

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This article is dedicated by the extended arm excavator. For more information, please click: http://www.scinice.com Sincere attitude. We will provide you with comprehensive services. We will gradually contribute more relevant knowledge to everyone. Stay tuned