1. The engine speed drops.
First, test the output power of the engine itself. If the output power of the engine is lower than the rated power, the cause of the failure may be poor fuel quality, low fuel pressure, incorrect valve clearance, an engine cylinder does not work, the injection timing is wrong, fuel The set value is not correct, the air intake system leaks, the brake and its control rod are defective, and the turbocharger deposits carbon. If the pump control system fails, the load optimization of the engine, pump and valve in different operating conditions cannot be achieved, and the excavator will not work properly. Such failures must start with the electrical system before checking the hydraulic system. Finally check the mechanical transmission system.
2. The working speed becomes slow.
The working speed of the excavator is slowed down mainly due to the wear of various parts of the whole machine, which causes the engine power to drop and the hydraulic system to leak. The hydraulic pump of the excavator is a plunger variable pump. After working for a certain period of time, the internal hydraulic components of the pump (cylinder, plunger, valve plate, nine-hole plate, turtle back, etc.) will inevitably produce excessive wear and cause internal leakage. The data of each parameter is not coordinated, which results in insufficient flow, excessive oil temperature and slow working speed.
At this time, the whole machine needs to be overhauled to repair and replace the parts with excessive wear.
3. The excavator is weak.
Weak excavation is one of the typical failures of excavators. There are two cases for weak digging: one is weak digging, the engine does not hold back the vehicle, and the load is very light; the second is weak digging, when the boom or stick extends to the end, the engine severely holds back the vehicle, or even stalls .
