Details: a Hitachi ex200-5 excavator suddenly emits black smoke during operation. It is OK to check the gas distribution system and oil pump nozzle of the excavator.
As soon as the excavator makes a combined action, it emits black smoke, and the black smoke is relatively large. After checking the oil circuit and changing the filter element, there is still black smoke. What is the reason? It may be caused by insufficient air intake Checked the oil circuit and found 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 Hitachi ex200-5 excavator suddenly emitting black smoke? Black smoke analysis:
1. The excavator suddenly emits black smoke during work. If there is adjustment data before, it is recommended to control the return oil pressure of the diesel pump to a high point. Add: on the diesel pump, there is a 36 screw to open, and there is a small screw inside to tighten it by one turn
2. Check whether there is air leakage in the exhaust system and air intake system of the supercharging system to see if there is black smoke caused by insufficient air intake
3. The mechanical and electrical system of Hitachi ex200-5 excavator will not change the proportional valve data normally. The problem should be the diesel pump
4. If there is black smoke, the engine speed decreases, and the pump control pressure and action speed deviate, it can be adjusted on the pump (the specific position is the wide open side door, facing the hydraulic pump, the pump on the left) adjustment note: the adjusting screw on the left can be adjusted clockwise to increase the output flow of the pump, and counterclockwise to reduce the output flow of the pump The adjusting screw at the bottom left can be adjusted clockwise to reduce the maximum output flow of the pump, and it can be adjusted counterclockwise to increase the maximum output flow of the pump.
