Step 1: Unscrew the screws that fix the upper cover of the motor, and open the motor cover. Unscrew the tightening screw of the small belt, and then remove the screw that fixes the motor base to the frame.
Step 2: Remove the screws that fix the motor base, then replace the new motor and fix the base on the new motor, and fix the motor base on the frame.
Step 3: Adjust the small belt in a straight line, fix the screws on the motor base and the frame, and then tighten the small belt elastic screws. Turn the small belt by hand until it turns to 45 degrees.
Step 4: Close the motor cover and tighten the screws that fix the motor cover.