Under normal circumstances, the idle speed of the excavator is unstable, and the lack of action means that when the throttle of the excavator is placed in the idle position, if the throttle of the excavator is increased, the engine speed of the excavator will quickly increase.
Failure performance:
Hitachi 120-5 excavator diesel engine idle speed is unstable. Idle speed fluctuations, the speed is gradually reduced, easy to turn off; regular fluctuations in idle speed, easy to turn off.
Hitachi 120-5 excavator is working, why is unstable idle speed?
1. The idle spring pulse is too small; the idle spring is broken.
2.Idle speed is adjusted too low.
3. The governor is faulty, each axle pin is worn and the gap is too large; the hinge point is blocked; the rack movement is issued.
4.The diesel engine itself is malfunctioning.
5.The injector is faulty, the nozzle needle valve is stuck, and the sealing of the outlet valve is unstable.
6.The fuel injection pump malfunctions, and the fuel injection quantity and fuel injection pressure fluctuate.
7. The fuel label is incorrect; the fuel contains water.
8. The angle of injection timing changes; it will also cause the idle speed of the excavator to be unstable.
Hitachi 120-5 excavator is working, why is unstable idle speed?
1. Properly increase the idling speed.
2. Check and adjust the governor.
3. Repair idle speed spring.
4.Adjust and repair the fuel injection pump.
5.Adjust and repair each fuel injection nozzle to make the fuel injection volume consistent.
6. Fill qualified fuel;
7. Adjust the fuel injection advancer, adjust and fasten the connector.
8.Maintain the diesel engine itself.
What's the problem with the unstable idle speed of Hitachi 120-5 excavator? The above is the analysis and troubleshooting method of Hitachi 120-5 excavator with unstable idle speed.
