Symptoms of excavator engine hard starting:

① The starter speed is normal and drives the engine to turn normally, but the engine is hard to start;

② The engine is hard to start in a cold state;

③ The engine is hard to start in a hot state

Causes of excavator engine hard starting:

① The fuel filter is dirty and clogged;

② Fuel pump failure, causing the excavator engine hard starting fault;

③ Incorrect fuel injection timing angle;

④ The starting preheating device circuit is open, the preheating device does not work, the oil temperature is too low, and the intake air temperature is too low;

⑤ The intake air filter is clogged, causing the excavator engine hard starting fault;

⑥ The fuel line leaks oil, the fuel circuit changeover switch on the fuel tank is in the wrong position, and there is no fuel supply;

⑦ Starter failure;

⑧ Improper starting operation;

⑨ Incorrect fuel grade, causing the excavator engine hard starting fault;

⑩ Engine failure;

Troubleshooting methods for excavator engine hard starting:

① Check and replace the fuel filter;

② Check and replace the air filter element;

③ Check and adjust the fuel pump;

④ Check the oil pipes and oil circuit to ensure smooth fuel supply;

⑤ Adjust the fuel injection timing angle;

⑥ Check the cold start preheating device so that it can work reliably during cold starting; cold start preheating consumes a large amount of battery energy, so the battery power supply must be ensured when using the cold start preheating device;

⑦ Check the starter and starting control device to ensure reliable operation;

⑧ Start the engine correctly;

⑨ Fill with fuel of a qualified grade; if necessary, drain the water from the fuel in the lower part of the fuel tank;

⑩ Repair the engine;