How do I remove the cutting head from a Troy-Bilt TB685 EC?

To remove the cutting head from a Troy-Bilt TB685 EC, first ensure the trimmer is turned off and disconnected from any power source. Use a wrench to loosen the bolt securing the cutting head, turning it counterclockwise. Once loose, pull the head straight off the shaft. If necessary, consult the user manual for specific details related to your model.