With the development of machinery level, the development of small excavators is becoming more and more technological, but no matter how good things are, they may have more or less problems if they are used too much. Stuck in the car, dropping the arm, and emitting black smoke are called the three major problems. the first. For example, what is wrong with the arm of the excavator? The arm of the small excavator is also called: boom, self-falling, falling pump, etc. In simple terms, the arm of the small excavator is actually a manifestation of the weakness of the arm of the small excavator. After the arm is raised, the boom or forearm will automatically fall without the control of the joystick.
When a small excavator has an arm drop failure, it will also appear in different forms. The fault phenomena can be roughly divided into arm drop, small arm drop, middle arm drop, cold car normal hot car drop arm, etc. Here are the specific reasons for you in detail:
7 common causes of arm failure:
1. Arm drop caused by hydraulic oil failure. If the car is cold and the car is hot, it is likely that there is a problem with the hydraulic oil.
2. The hydraulic cylinder of the small excavator is faulty, especially when the oil seal of the oil cylinder is damaged or aging, resulting in internal leakage of the oil seal.
3. The distribution valve valve hole is blocked, the valve core is worn, the valve core clearance is too large, and the main safety valve of the distribution valve is worn and damaged, resulting in the large and small booms.
4. When the oil seal of the safety relief valve of the large and small arms is damaged, a certain leakage will be caused, which will also lead to the phenomenon of arm drop.
5. It is caused by poor sealing of the distribution pump, also known as "oil unloading". At this time, the sealing ring of the distribution pump needs to be replaced.
6. Poor contact of hydraulic pump proportional solenoid valve joints will also cause arm drop phenomenon.
7. Severe arm drop (the oil temperature is about 45°C, and the bucket teeth drop by more than 95mm in 5 minutes), most likely caused by the main valve being stuck.
8. The proportional solenoid valve connector of the hydraulic pump is in poor contact.
The method of handling the broken arm of the excavator:
1. Check the operating environment temperature of the small excavator, whether there is improper selection of hydraulic oil type, and whether inferior hydraulic oil is used.
2. In the event of an arm drop failure, you can first reduce the pressure of the boom and carefully observe whether the boom falls quickly.
3. Check whether the hydraulic cylinder and the oil seal of the oil cylinder are faulty. If the oil seal is not well sealed, oil will leak. The oil seal should be replaced in time.
4. After replacing the oil seal, if the arm is lost, check the distribution valve and the oil return safety valve of the arm.
5. Check whether the working pressure and pilot pressure of the main hydraulic pump of the small excavator meet the requirements.
Regardless of whether the excavator has obvious or subtle faults, and regardless of whether the state of the machine is stable or fluctuating at the time, everyone must stop the engineering work in hand as soon as possible and solve the fault as soon as possible, otherwise the small problem will become a major fault and the loss will not be worth the loss! The above is the whole content of the small excavator boom introduced by the small excavator manufacturer, I hope it will be helpful to you.