The excavator often has the big and small trouble, the trouble really calls the people hurt! I don't know if the machine friends encounter the situation of the excavator's arm drop? Why does your love machine fall out of the arm? How do you solve the failure of the arm?
What's the excavator's arm dropping?
A excavator's arm dropping is called a hoist, a fall, a drop pump and so on. Simply speaking, the arm is a manifestation of the powerless arm of the excavator. When the arm is lifted, the big arm or the small arm will drop automatically when the lever is not controlled.
When the excavator has a broken arm, there will be different forms of expression. The failure phenomenon can be roughly divided into the arm of the arm, the arm of the small arm, the arm of the middle arm, the arm of the normal hot car of the cold car and so on.
7 common reasons for the breakdown of the arm:
1. the arm caused by the hydraulic oil fault. The cold car will lose its arm if it is hot.
2. the hydraulic cylinder of the excavator is out of order, especially the damage or aging of the cylinder oil seal, resulting in the leakage of the oil seal.
3. distribution valve valve hole blockage, spool wear, valve core clearance too large, distribution valve main safety valve wear and tear damage caused by the boom arm.
4. when the oil seal of the safety relief valve of the large and small arms is damaged, it will cause a certain leakage and also lead to the phenomenon of falling arm.
5. the poor sealing of the distributor pump is also known as "oil unloading". The sealing ring of the distributing pump needs to be replaced at this time.
6. the poor contact of the proportional solenoid valve of the hydraulic pump will also cause the arm to fall off.
7. serious arm drop (oil temperature 45 degrees Celsius, 5 minute bucket teeth falling more than 95mm), most likely caused by the main valve was stuck.
What do the excavators do when they fall out of their arms?
1. check the temperature of the working environment of the excavator, whether there is any improper selection of the hydraulic oil model, and whether or not the inferior hydraulic oil is used.
2. when the arm failure occurs, the pressure of the boom can be reduced to observe whether the boom is falling quickly.
3. check whether there is any fault in the hydraulic cylinder and cylinder oil seal. If the oil seal seal is bad, oil leakage will occur, and the oil seal should be changed in time.
4. if the oil seal is changed, if the arm is dropped, check the distribution valve and the return valve of the boom.
5. check whether the working pressure and pilot pressure of the main hydraulic pump of the excavator meet the requirements.
