After the excavator has been used for a period of time, many excavator masters have reported failures of insufficient power of the excavator engine. Here to answer this question for you!
Failure details:
After using a Hitachi ZX210H-5A excavator for a period of time, sometimes the engine exhaust is above the mid-throttle exhaust smoke, the machine power is obviously insufficient.
Failure details analysis:
The general reasons for the insufficient power of the excavator engine, although it is nothing more than the insufficient gas compression force in the cylinder and the failure of the oil supply system, but there are many specific factors that cause these reasons. Practice has proved that it can be excavated from Hitachi PC600-6 The phenomenon when the engine is running starts from a specific analysis and judgment.
1. Observe whether the combustion chamber of Hitachi ZX210H-5A excavator is leaking. When the engine first runs to the hot engine state, stop in time, and then use the crank handle to shake the crankshaft without decompression. According to the working order of each cylinder, rely on The gas compression force of each cylinder can be judged by feeling. If it is obvious that the resistance of a certain cylinder is small at this time, it means that the reason for the lack of power is due to the leakage of the combustion chamber.
2. To determine whether the intake and exhaust of the Hitachi ZX210H-5A excavator is normal, the engine must have enough air in the cylinder to fully burn the fuel and emit enough power. If there is insufficient air intake in the cylinder and the fuel is not completely burned, then It will inevitably make the engine power insufficient. For the same reason, if the exhaust gas in the cylinder is not exhausted, it will affect the intake volume and also reduce the engine power. The common causes of insufficient cylinder inflation and insufficient exhaustion are mostly intake and exhaust. The gap is too large, but whether the air filter, intake duct and exhaust duct are blocked is also a factor that cannot be ignored.
3. Check whether the fuel supply system of Hitachi ZX210H-5A excavator is faulty. Practice proves that if the technical conditions of the above two aspects are normal after inspection and judgment, the reason for the lack of engine power is obviously the fuel supply system. It may be that the fuel injection of the fuel injector is poor, or it may be caused by insufficient fuel supply or incorrect fuel supply time.
Suggest:
In the maintenance work, most of them check the fuel supply advance angle of the engine to determine whether the fuel supply time is correct. In the actual work site, a common and easiest method is to observe the end time of the fuel injection of the fuel injection pump and the piston to the top dead center of the compression stroke Whether the time is consistent. If it is inconsistent, as long as it is adjusted to be basically the same, the fuel supply advance angle at this time can basically guarantee the use, although the accuracy is less than that when using the instrument to adjust. When checking, if the two When the time is inconsistent, that is, when the piston reaches the top dead center of the compression stroke, the fuel injection pump stops the fuel supply in advance or continues to spray for a long time, it means that the fuel supply time is too early or too late, all need to be adjusted.
