When agricultural machinery manufacturers fit a PTO overload clutch to their implements and equipment, they take into account the maximum torque that the PTO driveline can handle on that piece of equipment including gearboxes, shafts, chains and sprockets.
For example ( maximum gearbox torque rating 2000Nm )
The manufacturer will then fit a PTO overload clutch to the implement with a slightly lower torque rating, thereby ensuring that the maximum gearbox torque rating is not exceeded in the event of a machine blockage or obstruction.
There are generally two types of PTO overload clutch, a cam cut-out clutch and a friction disc torque limiting clutch, commonly all referred to as "PTO Slip Clutches".
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