Possible cause 1: The clipping head is not adjusted correctly. If necessary, readjust the plate pressure. To do this, tighten the knurled screw so much that the upper cutting plate can be pushed back and forth with medium pressure between thumb and forefinger.
Or adjust with the Torqui GT142.
Possible cause 2: There is hair and/or dirt between the clippers. Disassemble the clipping head and clean all parts.
Possible cause 3: The clipping head wobbles back and forth and vibrates strongly after switching on. Check if the dovetail (blade holder) is loose. Tighten the fastening screws. Check whether the dovetail is worn. If so, a service is due.
Possible cause 4: The clipping head is not properly engaged on the swing lever. Switch off the machine and remove the clipping head. Push the clipping head halfway onto the dovetail, switch on the machine and, with the machine running, push the clipping head completely on, pressing the lever.