Excavator drop in engine speed is the excavator during the operation of the engine rotation decline in speed phenomenon.

Excavator engine drop in speed performance:
1, excavator engine slight fall speed (within 200 rpm);
2, excavator engine speed serious (more than 300 turn, may lead to serious excavator car fault).
What is the reason for the drop speed?

Explaination one:
Some car is use the solenoid valve (fuel cut-off device) to control the oil off the oil, so as to achieve the purpose of modern, flameout, Daewoo, Cummins engines are.
Once encountered similar problems, electromagnetic valve clearance is too large,
like flameout wire pull half the effect of loading lead to oil supply is not enough. So drop in speed will lead to shortage of lubricating oil in diesel pumps. It is a vicious cycle that can eventually leading to stall.
 
Explanation two:
The effect of temperature is relatively small, after all, a cooling device, the environmental impact is mainly for air pressure, high altitude, thin air, low oxygen. Engine combustion is insufficient, it affects the performance of the engine, but the air compressor also reduces the effect of high altitude.
The main reason that affects the engine speed is the change of the load. When the hydraulic system fails, it will not change the displacement.

Explanation three:
The speed of the main reasons for the two, the engine performance decline, the main pump problems, check the engine and the main pump.
You can put the hydraulic filter elements are removed to see, see a lot of copper on the filter element is the main pump problem to overhaul the main pump.
You can also enter the monitor panel to view the engine speed, the minimum throttle idle speed is more than 1 thousand rpm, the maximum throttle idle speed is more than 1 thousand and 300 rpm, the maximum throttle is the work of the transfer of more than 1 thousand and 900.
If there is no copper powder, the engine speed is normal, the two solenoid valve of main pump on detaching and cleaning it can eliminate the problem.

Explanation four:
If the engine output power is much lower than the rated power, such as in the construction site to determine the easiest way to start.
First look at the fuel filter is blocked, if there is a leak in the fuel oil, the fuel pump plunger, the injector head, out of the oil valve is serious wear, the air filter inlet is smooth, with turbocharger engine, turbocharger is damaged, if the engine speed at high temperature, oil viscosity decrease caused by closed wall lax compression ratio decreased, whether caused by the wear of cylinder liner components serious leakage, engine valve closed lax, all these factors seriously affect the engine power.
If the engine itself is excluded from the output power, it is necessary to consider the flow of hydraulic pump and engine output power matching problem.