Which of the following statements will be true if the position of the manual control lever, shown in the illustration, remains unchanged after the pump is placed on stroke. Illustration GS-0039

Correct Answer: Option A — Although oil will leak past part 'B,' the amount of pump stroke will be maintained until the control handle position is changed.

Hydraulic control systems often utilize a pilot-operated mechanism where internal leakage is inherent. Once the control lever is set, the pump stroke is maintained by the balance of forces within the control piston. Minor leakage past the spool does not alter the stroke until the operator manually changes the input.