Details: A Hitachi EX200-5 excavator suddenly emits black smoke during operation. Check the gas distribution system of the excavator and the oil nozzle of the oil pump.
The excavator emits black smoke as soon as it performs a combined action, and the black smoke is still relatively large. After checking the oil circuit and changing the filter element, there is still black smoke. What is the reason? It may be a problem with the intake air, which is caused by insufficient intake air. No problem, it is recommended to check the oil pump and hydraulic pressure. Check whether the intake system and exhaust system are blocked. Or the supercharger is broken.
What happened to the Hitachi EX200-5 excavator suddenly emitting black smoke? Analysis of black smoke:
1. Black smoke is suddenly emitted during the work of the excavator. If there are adjustment data before, it is recommended that the return pressure of the diesel pump can be controlled to a high point. Supplement: On the diesel pump, a 36 screw is opened, and there is a small screw inside to tighten it once.
2.Check the exhaust system of the supercharging system, whether there is any leakage in the intake system, and see if it is caused by insufficient smoke.
3. Hitachi EX200-5 excavator electromechanical system will not change the proportional valve data normally, the problem should be the problem of diesel pump
4.If there is black smoke, and the engine speed drops, the pump control pressure, and the operating speed deviate, you can adjust it on the pump. (The specific location is the wide open side door, facing the hydraulic pump, the pump on the left hand side) Adjustment Note: upper left The adjustment screw is adjusted clockwise to increase the output flow of the pump, and the counterclockwise adjustment is to reduce the output flow of the pump. The adjustment screw at the bottom left is adjusted clockwise to reduce the maximum output flow of the pump and counterclockwise , Can increase the maximum output flow of the pump.
