NotTaR of small Gasoline Engines and Rotary Lawn Mowers : Dead-man control                        
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Dead-man control

All rotary mowers manufactured within the past 15 years or so must have a dead-man control to stop the blade quickly (within a couple of seconds) if the handle is released or the operator falls off of the seat of a riding mower or lawn tractor. While not foolproof, this feature greatly reduces the chances of serious injuries due to accidental slipping or falling - or attempting to make adjustments while the blade is spinning.

WARNING: Never defeat the dead-man control for any reason unless there is no chance of the mower starting.

Always restore the dead-man control to normal operation before attempting to start the mower.