How do self-propelled rotary lawn mowers work?

Answer 1

Self-propelled rotary lawn mowers require the operator to squeeze a bar to engage the mower, which causes the machine to take off -- all you have to do is control the direction in which it goes. If you release your grip on the bar, the mower blade stops spinning. For the higher-end self-propelled rotary mowers, the drive system does not shut off when you release the bar – a convenient feature, in case you’d like to transport the lawn mower from point A to point B without cutting grass along the way.

Answer 2

They work off of the engine and a belt that drives the gears for the wheels