Baby Lock BL7800, Service Manual

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4. TIMING OF NEEDLE AND ROTARY HOOK (CLEARANCE BETWEEN THE
NEEDLE AND THE ROTARY HOOK POINT)
STANDARD
When the machine is in test mode and is selected, and the needle is raised 2.9 to 3.3 mm from its lowest
position, the rotary hook point should be aligned with the outer circumference of the needle. The clearance between
the needle (golden needle) and the rotary hook point should be 0.1 mm or less, and they should never touch each
other .
ADJUSTMENT
1. Put the machine in test mode and select pattern .
2. Loosen the three screws of the lower shaft gear.
3. Adjust the clearance between the needle and the rotary hook. (When the needle is raised 2.9-3.3 mm from its
lowest position, the rotary hook point should be positioned at the right side of the needle.)
4. Tighten the three screws of the lower shaft gear.
5. Turn the adjusting screw, and set the clearance between the needle and the rotary hook point to 0.1 mm or
less. Make sure that the needle does not make contact with the rotary hook point.