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(3) Grease every six months to the following units which consisted by gear mechanism.
NOTE Remove the face cover and other covers in advance.
<5>: Rack gear which has presser foot unit.
<6>: Gear of the needle thread tensioner drive unit.
<7>: Gear of the hook rotating unit.
Recommended grease: Molybdenum disulfide grease
<5>
<6>
<7>
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