Nowadays, the mining loader is an indispensable working tool in various engineering projects, but it often encounters many faults when in use. Once there is a fault, it will give customers a headache. The following are the reasons for the automatic falling of the boom of the mining loader:

1、動(dòng)臂操作滑閥的操縱機(jī)構(gòu)調(diào)整不當(dāng)，使動(dòng)臂滑閥未能完全處于中位，應(yīng)檢查操縱機(jī)構(gòu)是否調(diào)整在中。

1. The control mechanism of the boom operating spool valve is not adjusted properly, so that the boom spool valve cannot be fully in the middle position. Check whether the control mechanism is adjusted in the middle position.

2、動(dòng)臂油缸活塞密封圈損壞或油缸缸筒損壞，造成油缸內(nèi)泄嚴(yán)重，應(yīng)更換密封件或更換動(dòng)臂油缸。

2. If the piston seal ring of boom cylinder is damaged or the cylinder barrel is damaged, resulting in serious internal leakage of the cylinder, replace the seal or replace the boom cylinder.

3、分配閥動(dòng)臂滑閥閥桿磨損過(guò)度，密封不嚴(yán)，應(yīng)更換分配閥。

3. The valve rod of the boom slide valve of the distribution valve is excessively worn and the seal is not tight. The distribution valve should be replaced.

4、分配閥上的閥損壞，引起內(nèi)泄。

4. The safety valve on the distribution valve is damaged, causing internal leakage.

以上是對(duì)小型裝載機(jī)大臂下落原因的分析，希望對(duì)廣大客戶(hù)有所幫助，還有就是判斷是分配閥還是油缸的原因引起動(dòng)臂自動(dòng)下降的方法為：將動(dòng)臂舉高位置，將動(dòng)臂閥桿致于中位，聽(tīng)動(dòng)臂油缸處有無(wú)響聲，如果有嘭、嘭的響聲，則為分配閥有故障，如果沒(méi)有響聲，則可能是油缸的問(wèn)題，應(yīng)拆檢油缸。

The above is the analysis of the reasons for the fall of the boom of the small loader. I hope it can be helpful to our customers. Also, the method to judge whether it is the distribution valve or the oil cylinder that causes the boom to drop automatically is: lift the boom to the high position, turn the boom valve rod to the middle position, and listen to whether there is a sound at the boom oil cylinder. If there is a bang and bang, the distribution valve is faulty. If there is no sound, It may be a problem with the oil cylinder, and the oil cylinder should be disassembled and inspected.