The creaking throttle of Cummins dump truck.

1. Fuel system failure: Jitter may come from the high-pressure fuel pipe or injector parts in the fuel system, which will generate vibration and * * * vibration during operation, resulting in noise.

2. Engine transmission system problems: parts in the engine transmission system, such as belts, wheels, gears, etc. , in the process of operation may be loose, wear or malfunction, resulting in noise.

3. Piston or piston ring failure: If the piston and piston ring in the engine are worn, cracked or loose, it will also lead to abnormal sound.

4. Engine external parts failure: In addition to the above-mentioned engine internal parts, there are some external parts such as exhaust pipe, fan and radiator. If it is loose, collided or deformed, it may also cause noise problems.