JUKI MF-7900 Series Engineer's Manual page 67

Adjustment procedures
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 ex-
pelled, resulting in mechanical failure.
4. Replacing the lubricating oil
In case of the new sewing machine, replace the lubricating oil
(JUKI CORPORATION GENUINE 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 ❶ .
(2) Remove drain screw ❶ . The lubrication oil is drained.
(3) After the drain, wipe out the oil and attach the drain screw ❶ .
Results of Improper adjustment
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