当挖掘机出现掉臂故障的时候，也会出现不同的表现形式，故障现象大致可以分为大臂掉臂、小臂掉臂、中臂掉臂、冷车正常热车掉臂等等。

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点常见原因

7 Common Causes of Arm Drop Fault

1.液压油故障引起的掉臂。冷车正常热车掉臂，很有可能就是液压油有问题。

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.挖掘机的液压油缸出现故障，尤其是油缸油封损坏或老化，造成油封内漏引起的。

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.分配阀阀孔阻塞、阀芯磨损、阀芯间隙过大、分配阀主阀磨损损坏，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.当大小臂溢流阀油封破损时，造成一定的泄漏，也会导致掉臂现象。

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，也称之为“卸油"，这时需要将分配泵的密封圈更换。

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.液压泵比例电磁阀接头接触不良，也会引起大小臂掉臂现象。

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

7.严重掉臂（油温45℃左右,5分钟斗齿下降超过95mm），有可能是主阀被卡导致的。

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.

挖掘机掉臂该怎么办？

What should I do if an excavator loses its arm?

1.检查挖机作业环境温度，是否存在液压油型号选用不当情况，是否使用了劣质液压油。

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.出现掉臂故障时，可以先将动臂压力调小，仔细观察动臂是否很快下落。

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

3.检查液压油缸、油缸油封有没有故障，油封密封不良会漏油，要及时更换油封。

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.更换油封后，如果还掉臂，要检查分配阀以及动臂回油阀等。

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

5.检查挖掘机主液压泵的工作压力和先导压力是否符合要求。

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

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