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The main pump of the excavator's hydraulic pump is the core of its hydraulic system, and the main working principle is as follows: 1.Power source: the main pump is powered by a diesel engine.   2.Hydraulic pump type: usually gear pumps or piston pumps, the oil pressure into the system.   3.Oil inlet: oil from the tank is sucked in and filtered.   4.Pressure oil: oil is compressed in the pump, pressure and flow increase.   5.Output oil: High-pressure oil is delivered to the hydraulic cylinders and motors to drive the various components of the excavator.   6.Control system: The flow of oil is controlled by hydraulic valves to realize the operation of different working devices.   7.Return oil: The oil returns to the tank after use and passes through the radiator to cool down.   In short, the main pump converts mechanical energy into hydraulic energy to drive the excavator to complete the operation. For further information, please feel free to ask!

The working principle of a diesel engine is based on the combustion process of diesel fuel, which is divided into several important steps:   1.Intake process: When a diesel engine is in operation, air is first drawn in through the intake valve. At this time, no fuel is added, only pure air into the cylinder. 2.Compression: The air entering the cylinder is compressed by the piston moving upwards. The compression ratio is usually high, which causes the temperature inside the cylinder to rise significantly, reaching approximately 700°C to 900°C. The compression ratio is usually high. 3.Injection and combustion: As the piston approaches top dead center, injectors atomize the diesel fuel and spray it into the hot, pressurized cylinder. The diesel fuel ignites spontaneously at high temperatures and then undergoes rapid combustion, resulting in the production of high-temperature, high-pressure gases.   4.Work process: the high pressure gas produced by combustion pushes the piston to move downward, which is converted into mechanical energy. The movement of the piston is connected to the crankshaft through a connecting rod, which rotates to drive a car or other mechanical device.   5.Exhaust process: When the piston moves to lower dead center, the exhaust valve opens and the combustion exhaust gas is pushed out of the cylinder, ready for the next round of work.   Diesel engines are widely used in heavy-duty vehicles and industrial machines due to their high efficiency, high torque and good fuel economy. If you have more in-depth interest or questions about certain aspects of diesel engines, feel free to let me know!