Like Todd said, the deck has a foot lever to engage the blades. The pto belt from the engine to deck is always spinning, if the belts/deck linkage is not adjusted properly, the blades will "drift" and spin even with the foot lever off. The thrower also has it's own system to start and stop the thrower while the pto pulley is spinning all the time. You don't need the add on pto to run the deck and thrower made for an O. It was a safety measure to have fewer constantly moving parts that could lead to injury.
Bill
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