Use a screwdriver to remove the needle from the unit. Remove the foot from the machine with your screwdriver.
Remove the machine’s throat plate by taking out the screws from the unit casing.
Use a pair of tweezers and a lint brush to remove any debris from the gears or the other parts on the unit.
Use a can of compressed air to blow out the bobbin area and the footplate.
Use a degreaser to remove the grease from the gears on your sewing machine. Spray the degreaser onto your rag and then wipe down the gears to remove the grease.
After degreasing the gears, put a small drop of oil on the gears so they work properly. Replace the throat plate and the foot. Replace the screws on the unit casing.
Replace the needle on your sewing machine.