Engine speed drop is the fault of engine speed drop during excavator operation. There are two types of speed drop, one is a slight speed drop within 200 rpm. The other is a serious speed loss of more than 300 revolutions, which is likely to cause the excavator to suddenly shut down. There are 8 main reasons for engine speed drop of excavator.
1. It is caused by diesel oil circuit failure of excavator. Generally, when the diesel oil circuit is blocked, it may cause speed drop.
2. The hydraulic system of the excavator has a fault, which makes the hydraulic pump unable to change the displacement normally, resulting in high system pressure, speed drop and possible choke failure.
3. The output power of the excavator engine 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. Poor fuel quality or high fuel water content of the engine will lead to insufficient engine power and speed drop.
5. When the air intake system leaks or is blocked, it will lead to insufficient air supply to the engine, insufficient fuel combustion, speed loss and black smoke.
6. Due to the large clearance of solenoid valve, the oil supply is insufficient, resulting in engine stall.
7. The fuel supply circuit pipe joint of the fuel system is loose or the pipeline is broken, resulting in fuel leakage or foreign matter blockage, resulting in insufficient fuel supply. In addition to speed loss, it may also cause flameout.
8. There are many reasons for speed loss, such as wrong valve clearance, wrong fuel injection timing, damaged turbocharger, defective brake, etc.
What should I do when there is a speed drop?
1. First, check whether the diesel used by the excavator is deteriorated, whether there are impurities in the oil, and whether the oil circuit is blocked.
2. Check the valve clearance of excavator engine and the speed of engine.
3. Check the air inlet pipeline, clean the air pre filter and air filter element, and start the engine again.
4. Check whether the speed drop of excavator occurs under engine load?
5. Carefully check the engine to see if it is the engine failure that causes the excavator engine to slow down.
6. In addition, electric control, hydraulic system, fuel system, etc.
