It seems like a small problem that the excavator emits black smoke, but if it is not handled in time, it may cause the excavator to burn engine oil, or even cause damage to the four supporting parts of the engine, and eventually lead to overhaul.
Symptom: at the beginning of a Hitachi zx200-5a excavator, the oil nozzle of the excavator was always blocked and black smoke was emitted. After the new oil nozzle was replaced, the excavator still emitted black smoke.
Fault phenomenon analysis:
1. The black smoke from excavators is generally caused by insufficient and incomplete combustion.
2. At first, the oil nozzle of the excavator was always blocked and black smoke was emitted. It is recommended to check the oil circuit to see whether the hydraulic oil is too dirty or deteriorated, and whether the diesel oil used meets the specified requirements?
3. The excavator still emits black smoke after replacing the new fuel injector. It is analyzed that it may be because the model of the fuel injector replaced by the excavator is incorrect Although the size of the oil nozzle of the excavator is almost the same, it may not be able to work normally when it is installed, because the injection angle of the oil nozzle of the excavator is different. If the model of the oil nozzle is wrong, the Hitachi zx200-5a excavator will still emit black smoke after replacing the oil nozzle.
4. There may also be a problem with the air filter that causes black smoke from the excavator The troubleshooting method is to remove the air filter element directly. After starting the excavator, observe whether the exhaust under the engine still emits black smoke. If there is no black smoke, it indicates that the failure of air filter causes the problem of black smoke after replacing the nozzle of Hitachi zx200-5a excavator; If black smoke continues to appear, observe whether the excavator burns engine oil? If there is oil burning, it is the problem of the engine.
Supplement: the air filter element of the excavator is not good. The air filter will be blocked, resulting in insufficient air intake of the engine, resulting in insufficient combustion of the engine diesel oil. As a result, the Hitachi zx200-5a excavator still emits black smoke after changing the nozzle.
