JUKI MF-7700D Series Engineer's Manual page 55

Adjustment Procedure
3. Oiling
The mechanisms inside the frame such as the needle bar, presser
lift and spreader components are lubricated with grease. Never add
oil inside the frame.
(Caution) If inside of the frame is oiled, the grease will be expelled,
resulting in mechanical failure.
4. Replacing the lubricating oil
In case of the new sewing machine, replace the lubricating oil (JUKI
MACHINE OIL 18) with new one after using it for approximately one
month. Then replace the lubricating oil every six months.
(1) Set a container to receive the lubricating oil under drain screw
.
(2) Remove drain screw
(3) After the drain, wipe out the oil and attach the drain screw
. The lubrication oil is drained.
– 51 –
Results of Improper Adjustment
.