The phenomenon of sudden speed loss or flameout of excavator under stress is one of the common faults that can not be ignored. This article will summarize the 8 causes of this problem for reference only.
1. The engine power does not match the hydraulic pump power
Of course, this fault is closely related to the engine, which is generally caused by the decrease of engine power. If the engine power is lower than the power required by the hydraulic pump, check the fuel system and intake system for problems. In addition, problems with the oil pump will also reduce the engine power. It is usually necessary to calibrate the oil pump and replace the plunger nozzle.
2. Insufficient air intake of engine
This problem can also be caused when the engine air intake of the excavator is insufficient. There are many reasons for insufficient air intake, such as serious wear of the supercharger, incomplete operation of the supercharger caused by the blockage of the air filter element, air leakage of the exhaust branch pipe, reduced exhaust volume, etc. Replace the supercharger if necessary.
3. Caused by heavy load
Insufficient fuel supply is also one of the reasons. Generally, insufficient fuel supply will occur when the engine works under heavy load for a long time. At this time, it can be eliminated by adjusting the pump flow. Remember not to work under heavy load for a long time.
4. Oil problem
The sudden speed loss or flameout of the excavator under stress is related to oil products. Too many oil impurities will cause oil circuit blockage, filter blockage, too many oil tank impurities, engine power reduction, etc. Using oil with more impurities for a long time will damage the excavator. In addition, if the selected oil models are inconsistent and mismatched parts are installed, it may also cause suffocation. It is recommended that you choose regular accessories and high-quality oil.
5. Fuel system problems
If the long-term use of inferior oil products causes a large number of impurities at the bottom of the oil tank, the oil tank should be cleaned regularly to dredge the oil pipeline and the position of the oil pipeline connection. In addition, the oil-water separator can not be ignored. The drain valve at the bottom should be opened regularly to drain water, otherwise excessive water storage will also cause excavator failure.
6. The large pump regulator is dirty
When working for a long time and ignoring the oil dirt formed around the large pump regulator, the regulator is blocked, resulting in the failure of the large pump regulator, resulting in failure. At this time, it can be disassembled and cleaned for commissioning or replacement.
7. Caused by abnormal circuit
Oil circuit inspection is important, and the circuit can not be forgotten. Sometimes, when the circuit is abnormal, it will also cause machine fault. When the fault occurs, first check whether it is the problem of the engine and the hydraulic system. If both are OK, check whether the electrical components are abnormal.
8. Wear and aging of parts
In the process of troubleshooting the excavator, the wear and aging of components must not be ignored. When there is no problem with the engine and pump power, you also need to check whether the cylinder liner piston of the engine is worn and whether there is oil and air leakage damage in other parts of the engine and hydraulic system. If any problem is found, it needs to be solved in time.
In case of excavator failure, professional repairmen shall be required to repair and eliminate it in time to ensure that the excavator can be used normally.
