The main function of the excavator exhaust hard pipe assembly is to collect and concentrate the exhaust from each cylinder, reduce exhaust resistance, and avoid mutual interference between cylinders, thereby ensuring smooth exhaust flow, reducing disturbances, and enhancing the overall performance of the engine.

The excavator exhaust hard pipe assembly, also known as part of the exhaust system, is designed to optimize the exhaust process of the engine. The exhaust system includes components such as the exhaust manifold and exhaust pipes, which work together to ensure that the engine’s waste gases are discharged efficiently and safely. Specifically, the functions of the exhaust hard pipe assembly are reflected in the following aspects:

1. **Reducing Exhaust Resistance**: By optimizing the design of the exhaust manifold, the resistance during waste gas discharge can be minimized, ensuring that the exhaust is expelled smoothly and preventing a decline in engine performance due to poor exhaust flow.

2. **Avoiding Mutual Interference Between Cylinders**: During the design process, by reasonably arranging the exhaust manifolds of each cylinder, mutual interference can be avoided, ensuring that the exhaust processes of each cylinder do not disturb one another, thus maintaining the efficient operation of the engine.

3. **Accelerating Preheating Speed During Cold Starts**: The advantage of an integrated exhaust manifold design is that it can quickly raise the temperature of the cooling fluid, speeding up the preheating process during cold starts, allowing the engine to reach an efficient working state more quickly and reducing wear on internal components during cold starts.

4. **Maintaining Normal Operating Temperature**: With cooling passages integrated into the cylinder head, the engine can maintain a normal operating temperature while running efficiently, ensuring both performance and durability.

In summary, the excavator exhaust hard pipe assembly optimizes the exhaust process, not only enhancing the engine’s performance and efficiency but also extending its service life, making it an important guarantee for the excavator’s performance and safety.