🔍 Key Concepts

• Hydraulic transmission A-end vs B-end roles (which side is driven by the electric motor, which side drives the load) • Difference between a pump and a hydraulic motor in a closed hydraulic loop • What variable displacement versus fixed displacement means in terms of speed control at the output

💭 Think About

• Look at the illustration: which component is directly connected to the constant speed electric drive motor, and which component is connected to the final driven gear? How does that help you decide whether the B-end is pumping fluid or being driven by fluid? • In a hydraulic transmission used for speed control, which end usually has variable displacement to change flow, and which end is usually kept at a constant or fixed displacement? • Ask yourself: at the B-end, is the shaft shown as the input or the output of power? Does it send mechanical power into the system, or receive it from the hydraulic fluid?

✅ Before You Answer

• Confirm whether the A-end tilt box (shown in the illustration) is associated with changing the displacement on the pump or on the motor. • Check if the B-end is labeled near the side that connects to the load (gear) or to the electric drive motor—this indicates its function. • Make sure you can clearly state: at B-end, is it acting as a pump (mechanical to hydraulic) or a motor (hydraulic to mechanical), and is its displacement variable or fixed based on the drawing.