Generally speaking, the excavator idle speed is unstable and the action is insufficient. When the excavator throttle is placed at the idle position, if the excavator throttle is increased, the excavator engine speed will increase quickly.
Fault performance:
The idle speed of Hitachi 120-5 excavator diesel engine is unstable The idle speed fluctuates, the speed gradually decreases, and it is easy to shut down; The idling speed fluctuates regularly and it is easy to shut down.
What happened to the unstable idle speed of Hitachi 120-5 excavator during operation?
1. The idle speed spring pulse is too small; The idle spring is broken
2. The idle speed is adjusted too low
3. Governor failure, worn shaft pins and excessive clearance; Hinge point block; Rack movement is jammed.
4. The diesel engine is faulty
5. Fuel injector failure, nozzle needle valve jamming, and unstable sealing of oil outlet valve
6. Fuel injection pump failure, fuel injection quantity and fuel injection pressure fluctuation
7. Incorrect fuel grade; The fuel contains moisture
8. The injection timing angle changes; It will also cause unstable idle speed of the excavator.
What happened to the unstable idle speed of Hitachi 120-5 excavator during operation?
1. Properly increase the idle speed
2. Repair and adjust the governor
3. Repair the idle spring
4. Adjust and repair the fuel injection pump
5. Adjust and repair each fuel injection nozzle to make the fuel injection quantity consistent
6. Fill qualified fuel;
7. Adjust the fuel injection advancer, adjust and tighten the connector
8. Repair the diesel engine itself
What happened to the unstable idle speed of Hitachi 120-5 excavator during operation? The above is the fault analysis and troubleshooting of unstable idle speed of Hitachi 120-5 excavator.
