How do I Replace a Motor Belt on a Bernina 830 Sewing Machine?

Reverse the hand wheel toward you to raise the needle. Turn off and unplug the Bernina 830 sewing machine. Remove any loose objects such as scissors, pins or seam rippers from the sewing arm. Tilt the machine on its side so that the bottom plate is exposed to view. Use a screwdriver to remove the screw in the middle of the plate. Set the bottom plate and its screw aside.

Angle the machine toward you so that you have a clear view of the inside of the side panel. Use a screwdriver to remove the screw in the middle of this side panel.

Carefully pull the bottom of the side panel out toward you and down to release it from the sewing machine. Set the side panel and its screw aside. Push the wire assembly running to the motor to the side to reveal the motor assembly screws.

Remove the two screws beneath the motor set-up with a screwdriver. Rotate the motor out toward you. Note how the motor belt is threaded around the motor and its pulley. Gently pull off the motor belt and discard it.

Thread the new motor belt around the motor and its pulley assembly. Rotate the motor back into the machine. Replace the two motor assembly screws that hold the motor in place. Gently pull the motor wiring back into place. Reattach the sewing machine's side and bottom panels. Flip the Bernina 830 right side up, plug it in and turn it on. Run some test stitches to ensure that the new motor belt is working properly.