Sensing system for agricultural machine

A drive mechanism subassembly comprising:

• a drive shaft;
• a gear assembly selectively coupled to the drive shaft by a slip clutch, the slip clutch including
• an outer sleeve operatively coupled to the gear assembly,
• an inner sleeve positioned within the outer sleeve, the inner sleeve coupled to and rotatable with the drive shaft,
• a torque-transfer member movably coupled to the inner sleeve and configured to selectively couple the inner sleeve to the outer sleeve when a torque on the drive shaft is at a first value that is less than a predetermined threshold, and
• a position sensor in communication with the torque-transfer member and configured to output a signal in response to the torque on the drive shaft increasing from the first value;
• and
• wherein a control unit is in communication with the position sensor and configured to determine that the clutch is beginning to slip in response to receiving the signal.

A drive mechanism subassembly comprising:

• a drive shaft;
• a gear assembly selectively coupled to the drive shaft by a clutch, the clutch including
• a gear assembly engaging member operatively coupled to the gear assembly,
• a drive shaft engaging member operatively coupled to the drive shaft and configured to selectively engage the gear assembly engaging member, and
• a sensor at least partially supported by the gear assembly engaging member and configured to output a signal in response to a differential torque between the gear assembly engaging member and the drive shaft engagement member being above a predetermined threshold;
• wherein a control unit is in communication with the sensor and configured to alter an operating parameter of a machine associated with the drive mechanism subassembly in response to receiving the signal.