What is the purpose of an overrun pto coupler?

An overrun PTO (Power Take-Off) coupler is designed to allow a tractor or other power source to transmit power to an implement while preventing back-driving of the implement when the power source is stopped or slowed down. This mechanism helps protect the tractor's drivetrain from damage due to sudden changes in speed or direction. Additionally, it enhances safety by ensuring that the implement cannot push the tractor forward unexpectedly. Overall, it improves the efficiency and safety of agricultural operations.