Hydraulically, servo-operated, automatic, change over valves, utilized in a two ram hydraulic steering gear, serve to __________.

Correct Answer: Option C — prevent either main pump from being hydraulically motored when idle by cross pressure flow

Automatic change-over valves prevent hydraulic motoring of idle pumps. If an idle pump were allowed to rotate due to cross-pressure flow from the active pump, it could cause mechanical damage or cavitation. These valves ensure that only the pressurized, active pump circuit drives the steering gear actuators effectively.