(1) The head of each hole, lubrication on the shaft and the upper shaft connected components.
(2) Panel internal components and parts connected to the moving parts. Lubricate the presser bar and needle bar and their associated components.
(3) The lower parts of the machine board activities wipe and add less oil.
The refueling holes and refueling parts of the amount of refueling do not have too much, one or two drops on the line.