A material reduction machine comprising: an engine ; a material reduction tool ; a drivetrain including a coupling and a power transfer element coupled to and driven by the engine when the coupling is in an engaged state, the engaged state configured to enable transfer of power from the engine through the power transfer element for driving the material reduction tool , the coupling further having a disengaged state configured to inhibit transfer of power from the engine through the power transfer element ; and a control system including a sensor in communication with the engine or the material reduction tool to detect a speed of the engine or the material reduction tool , characterised by a drivetrain protection system selectively operable during operation of the material reduction tool and, when triggered, configured to protect the power transfer element by putting the coupling into the disengaged state, and a controller including instructions configured to enable the drivetrain protection system in response to a first signal from the sensor indicative of the speed at or above a first threshold, the controller further including instructions to trigger the drivetrain protection system in response to a second signal from the sensor indicative of the speed below a second threshold. an engine ; a material reduction tool ; a drivetrain including a coupling and a power transfer element coupled to and driven by the engine when the coupling is in an engaged state, the engaged state configured to enable transfer of power from the engine through the power transfer element for driving the material reduction tool , the coupling further having a disengaged state configured to inhibit transfer of power from the engine through the power transfer element ; and a control system including a sensor in communication with the engine or the material reduction tool to detect a speed of the engine or the material reduction tool , characterised by a drivetrain protection system selectively operable during operation of the material reduction tool and, when triggered, configured to protect the power transfer element by putting the coupling into the disengaged state, and a controller including instructions configured to enable the drivetrain protection system in response to a first signal from the sensor indicative of the speed at or above a first threshold, the controller further including instructions to trigger the drivetrain protection system in response to a second signal from the sensor indicative of the speed below a second threshold. a sensor in communication with the engine or the material reduction tool to detect a speed of the engine or the material reduction tool , characterised by a drivetrain protection system selectively operable during operation of the material reduction tool and, when triggered, configured to protect the power transfer element by putting the coupling into the disengaged state, and a controller including instructions configured to enable the drivetrain protection system in response to a first signal from the sensor indicative of the speed at or above a first threshold, the controller further including instructions to trigger the drivetrain protection system in response to a second signal from the sensor indicative of the speed below a second threshold. <EOS>