Interpretation of Domestic Excavator Accessories: Precautions for Sudden Automatic Engine Shutdown and Walking of Komatsu Excavator Diesel Engine

2025-07-21

The summary of Chuanna's response to the sudden automatic shutdown of the diesel engine of the Komatsu excavator is as follows:

Disadvantage phenomenon: When the Komatsu excavator is working, the diesel engine suddenly shuts down automatically during operation, and the excavator cannot work normally.

Disadvantage diagnosis:

At the beginning, I thought the excavator ran out of diesel, so I checked the diesel and found that it wasn't. So I started the excavator here, but it still didn't catch fire, and I couldn't hear the "squeak, squeak" sound of the fuel injector spraying.

So we checked the excavator's oil circuit and found that there were no blockages in any part. So the repairman removed the fuel injector and took it to the test bench for inspection, and the fuel injector also worked normally. But after a period of time, the excavator will automatically shut down. At the same time, there are still bubbles in the high-pressure oil circuit.

3. Therefore, each oil pipe joint was checked again and found to have no leakage points, and the joint seal was intact. So, the suspicion may lie in the fuel injection pump. So the low-pressure oil circuit from the fuel tank to the fuel injection pump is filled with diesel, and then a certain pressure is applied to the pipeline connecting one end of the fuel tank. As a result, it was found that there was oil leakage from the positioning screw of the oil pump plunger sleeve.

4. When removing the screw, it was found that the copper washer at that location was severely damaged, and the positioning groove was just connected to the return hole of the fuel injection pump. In this way, when the fuel injection pump starts working on the downward movement of the plunger, the space in the upper chamber of the plunger increases to generate suction force, and low-pressure oil and external air that enters from the positioning screw are simultaneously sucked into the plunger sleeve. When the fuel injection pump pumps oil, it will press air into the high-pressure fuel pipe. In this way, bubbles are generated in the high-pressure fuel pipe, preventing diesel from flowing into the injector, and the diesel engine will automatically shut down.

Reason for the disadvantage: The copper washer of the positioning screw on the fuel injection pump is worn, causing the disadvantage to occur.

Repair method: Chuanna, a domestic excavator accessory, immediately changes and replaces the copper washer of the positioning screw.

In addition, many novice drivers ask if there are any precautions that Komatsu excavators need to pay attention to when walking.

The operation of domestic excavator accessories should pay attention to the following aspects:

Before starting the excavator, the environmental safety situation should be checked, obstacles on the road should be cleared, unrelated personnel should separate the excavator, and then the bucket should be lifted.

2. Choose a smooth road surface as much as possible, drive at a low speed when turning, and operate the steering as much as possible when making large turns.

3. The excavator's walking motor prevents collisions or grounding on boulders, and prevents additional force from being applied to the track section.

4. Assuming that the walking pole is parked on a slope, even if it is parked for a short period of time, the bucket should be lowered and the teeth inserted into the soil. When the excavator starts in the low-speed range, the engine speed will suddenly increase, so the driver should be careful when operating the walking rod.

6. When the excavator is walking in poor air conditions, it should be avoided that rocks may damage the walking motor and track frame. Mud, sand, and stones entering the track site can affect the normal movement of excavators and the service life of the tracks

7. When walking in water, the water depth should not exceed the track shoes on the side of the idler wheel, and full attention should be paid to the condition of the riverbed and water conditions.

Chuanna, a domestic excavator accessory manufacturer, believes that the walking of excavators is very important for their service life, so caution must be exercised during operation!

More information about excavator accessories can be found on Chuanna Industry (www.kscna. cn). We hope this article, "Interpretation of Domestic Excavator Accessories: Precautions for Sudden Automatic Shutdown and Walking of Komatsu Excavator Diesel Engine," will be helpful to everyone. If you still have any questions, please feel free to leave a message or consult Chuanna Hydraulic's national service hotline at 15850333149. We will answer your questions as soon as possible!