How do I use the Reverse Operation System (ROS)?
Move the motion control lever to neutral position. With the engine running, turn the ignition key counterclockwise to the ROS 'On' position. Look down and behind before backing, then slowly move the motion control lever to reverse position to start movement. When ROS is no longer needed, turn the ignition key clockwise to the engine 'On' position. Do not mow in reverse unless absolutely necessary. (Page 12)
From the official Craftsman 917.275700 Lawn Mower manual, page 12
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