Through understanding, there are two main manifestations of excavator speed drop: slight speed drop of the excavator engine (within 200 revolutions); severe speed drop of the excavator engine (above 300 revolutions, which may cause serious failure of the excavator to hold the car).
Under normal circumstances, the engine speed phenomenon can be checked from the following aspects:
1. The excavator's diesel oil circuit is faulty. Generally speaking, when the diesel oil circuit is blocked, it may cause a speed drop.
2. The hydraulic system of the excavator has a malfunction, which makes the hydraulic pump unable to change the displacement normally, causing the system pressure to be too high, slowing down, and holding the machine failure.
3. The output power of the excavator engine itself is insufficient, the output power is lower than the rated power, and the speed is too low. There is also a problem with the main pump.
4. If the fuel quality of the engine is too poor or the fuel water content is too high, the power of the engine will be insufficient and the speed will drop.
5. When the air intake system leaks or is blocked, it will cause insufficient air supply to the engine, resulting in insufficient fuel combustion, and failures of slowing down or emitting black smoke.
6. Because the solenoid valve gap is too large, the fuel supply is insufficient, which causes the engine to slow down.
7. The fuel system fuel supply loop pipe joint is loose or the pipeline ruptures, causing fuel leakage or foreign matter blockage, resulting in insufficient fuel supply. In addition to speed reduction, it may also cause flameout problems.
The above are the factors that affect the speed failure of the excavator engine, and the failure can be cleared in time if the cause is found!
