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Displacement is the measure of how much fluid it takes to turn the hydraulic motor shaft per revolution. It is typically expressed in cubic inches or cubic centimeters per revolution.

Given the same flow rate and pressure, a larger displacement motor will turn slower than a smaller displacement motor. A larger displacement motor will also produce higher torque than a smaller motor.

So as displacement increases, torque goes up and speed goes down. This makes sense as torque multiplied by speed equals horse power. For a same input horsepower (pressure times flow), if one value did not vary as the inverse of the other, the conservation of power would not be met.

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Q: How does displacement affect the speed of hydraulic motor?
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