Reasons for the reduction of excavator speed

The fault of the diesel oil circuit of the excavator is caused. In general, when the diesel oil circuit is blocked, the speed loss may be caused.
The hydraulic system of the excavator fails, so that the hydraulic pump can not change the displacement normally, resulting in too high system pressure, speed loss and possibly holding machine failure.
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.
The engine uses poor fuel quality or high fuel water content, which will lead to insufficient power of the engine, resulting in speed loss.
When the air intake system leaks or is blocked, it will cause insufficient air supply to the engine, resulting in insufficient fuel combustion, and there will be speed loss and black smoke.
Because the solenoid valve clearance is too large, the oil supply is insufficient, which causes the engine to lose speed.
The fuel system oil supply circuit pipe joint is loose or the pipeline is broken, causing fuel leakage or foreign body blockage, resulting in insufficient oil supply, in addition to speed loss may also cause flame failure.
There are many reasons for speed failure, such as wrong valve clearance, wrong fuel injection timing, turbocharger damage, brake problems and so on. Said so the cause of the excavator engine speed loss, then when the speed loss should be done?
First check whether the diesel used by the excavator is deteriorated, whether there are impurities in the oil, and check whether the oil circuit is blocked.
Check the valve clearance size of the excavator engine and check the speed of the engine.
Check the intake pipe, clean the air prefilter and air filter element, and start the engine again.
Check whether the speed loss problem of the excavator occurs under the load of the engine?
Carefully check the engine to see if it is caused by engine failure.
In addition, electrical control, hydraulic system, fuel system and so on need to be checked.