After the excavator has been used for a period of time, many excavator masters have reported that the engine power of the excavator is insufficient.
Fault details:
After a Hitachi zx210h-5a excavator has been used for a period of time, sometimes the engine emits black smoke when it is above the medium throttle, and the machine power is obviously insufficient.
Fault detail analysis:
Although the general reasons for the insufficient power of excavator engine are nothing more than the insufficient compression force of gas in the cylinder and the failure of oil supply system, there are many specific factors leading to these reasons Practice has proved that the specific analysis and judgment can be made from the phenomenon of Hitachi pc600-6 excavator engine running.
1. Observe whether the combustion chamber of Hitachi zx210h-5a excavator leaks. Stop the engine in time when the engine is running to the hot state, and then shake the crankshaft with the handle without reducing pressure According to the working sequence of each cylinder, the gas compression force of each cylinder is judged by the inspector's feeling of force. If it is obvious that the resistance of a cylinder is small at this time, it indicates that the reason for insufficient power is due to air leakage in the combustion chamber.
2. To judge whether the intake and exhaust of Hitachi zx210h-5a excavator work normally, when the engine works, there must be enough air in the cylinder to fully burn the fuel and generate sufficient power If the air intake in the cylinder is insufficient and the fuel combustion is incomplete, the engine power will be insufficient Similarly, if the exhaust gas in the cylinder is not exhausted, it will affect the air intake and reduce the engine power The common causes of insufficient cylinder inflation and exhaust are, of course, too large air inlet and exhaust clearance, but whether the air filter, air inlet pipe and exhaust pipe are blocked is also a factor that can not be ignored
3. Check whether the oil supply system of Hitachi zx210h-5a excavator has any fault. The practice has proved that if the technical conditions in the above two aspects are normal after inspection, the reason for insufficient engine power obviously lies in the fuel supply system At this time, it may be caused by poor fuel injection of the injector, insufficient fuel supply or incorrect fuel supply time.
Recommendations:
In the maintenance work, it is mostly to check the engine fuel supply advance angle to judge whether the fuel supply time is timing One of the simplest methods commonly used in the actual work site is to observe whether the fuel injection end time of the fuel injection pump is consistent with the time from the piston to the TDC of the compression stroke In case of inconsistency, as long as it is adjusted to be basically the same, the oil supply advance angle at this time can be basically guaranteed to be used, although the accuracy is slightly worse than that of the instrument During the inspection, if the two times are inconsistent, that is, when the piston reaches the top dead center of the compression stroke, the fuel injection pump stops fuel supply in advance or continues fuel injection for a long time, it indicates that the fuel supply time is too early or too late, which should be adjusted.
