Which step involves ensuring the vehicle does not move during PTO operation?

Setting the parking brake is crucial during Power Take-Off (PTO) operation because it secures the vehicle in place, preventing any unintended movement that could lead to accidents or equipment damage. When engaged, the parking brake locks the rear wheels, ensuring stability while the operator engages machinery powered by the PTO. This safety measure is especially important in emergency response scenarios where precision and control are vital.

While placing the transmission in neutral, chocking the wheels, and positioning the apparatus are also important safety practices, they serve different purposes. Placing the transmission in neutral helps to disengage the engine from the wheels, preventing the vehicle from moving if there were any inadvertent throttle applications. Chocking the wheels provides an additional safety measure to prevent rolling on an incline but may not always be feasible, especially on flat surfaces. Positioning the apparatus correctly ensures that the vehicle is positioned well for the task at hand; however, it does not directly prevent movement during PTO operation like utilizing the parking brake does.