Troubleshooting for excavator engine stalling

Summary of reasons for excavator engine stalling:

Fuel combustion causing self-stalling
Oil leakage in the excavator’s oil circuit, faulty fuel injection pump
If the excavator stalls on its own, and there were signs of gradually decreasing engine speed and black smoke from the exhaust pipe previously, it is likely due to poor oil supply in the excavator’s oil circuit, poor engine lubrication, or winter axle bearing burning.
If the excavator stalls suddenly during operation, it could also be due to contaminated diesel. In this case, replace the diesel filter and check the fuel injection nozzles.
If the excavator stalls after warming up and cannot be restarted shortly after, it could be a problem with the diesel pump (high-pressure fuel pump) or nozzles. Flushing the diesel pump with cold water can help diagnose the issue. If the engine can be started immediately after flushing, then the pump or nozzles are likely faulty.
Hydraulic system issue: excessive pump pressure
Electrical issue with the excavator: the control system may shut down the engine due to receiving incorrect signals

Summary of troubleshooting methods:

Firstly, check the excavator’s fuel supply pipeline. Is the fuel supply smooth? Is the pipeline blocked? It is recommended to clean the fuel filter, replace all filters, disassemble and inspect the diesel pump, and check if the fuel injection nozzle length is around 6-175px.
Secondly, check if the excavator has been operating for an extended period, indicating engine overload or overheating, triggering the engine’s self-maintenance function.
Excavator stalling is usually caused by fuel pipeline issues. Carefully inspect for air and oil leaks in the pipeline, check for damaged pipe joints, stuck filters, and ensure the water separator cover is tightened.
Stalling could also be related to hydraulic problems, such as mismatched hydraulic pump and engine power. Professional repair equipment and valve group adjustments with specialized equipment are required in this case.

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