Diesel-hydraulic systems combine a diesel engine with hydraulic components to transmit power. The diesel engine generates mechanical energy, which is then converted into hydraulic energy through a hydraulic pump. This energy can be used to operate various machinery, such as excavators and forklifts, making it efficient for heavy-duty tasks. The hydraulic system uses fluid to transfer power, allowing for smooth and precise control of movement. This technology is commonly found in construction equipment and industrial machines, where high torque and lifting capabilities are essential. Overall, diesel-hydraulic systems are valued for their strength and reliability in demanding environments.