Many users have replaced worn-out motors on older pumps. Close-coupled pump motors made before late 2010 did not have a regulated efficiency. In one recent case, a user replacing a 7.5-horsepower (hp), two-pole motor discovered that the motor had been drawing more than its nameplate amperage. This was because the old motor operated at 3,419 revolutions per minute (rpm) and the new motor at 3,542 rpm, which meant the pump was actually drawing 8.3 hp rather than the rated 7.5 hp—and producing more water flow. To adjust output, the pump’s impeller would need to be changed or trimmed based on input from the pump manufacturer.