Solenoid valve clearance is too large, so that the oil supply is insufficient, will cause small excavator engine speed loss; In addition, the valve clearance of small excavator is wrong, the timing of fuel injection is wrong, and the turbocharger is damaged, which will cause the speed loss.

The fuel quality of small excavator engine is too poor or the fuel water content is too high, will lead to the power shortage of small excavator engine, resulting in speed loss phenomenon; In addition, we need to check whether the oil is deteriorated, and see whether there are impurities in the oil collection, and check whether the oil circuit is blocked.