Baby Lock BL7800, Service Manual

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6. LOWER SHAFT
1. Attach the bushing presser L temporarily so as the center of lower shaft is positioned higher by 1 mm against
the center of eccentric metal.
2. Install the outer rotary hook, then turn the eccentric metal and make sure that there is no backlash on the
gears.
3. Tighten the screw on the bushing presser L.
7. FRONT/BACK, LEFT/RIGHT POSITION OF FEED DOG
STANDARD
When the machine is in test mode and is selected, and the left/right position is the maximum feed amount by
one revolution of the upper axle, the feed dogs should not contact the needle plate.
When the front/back osition is the maximum feed amount, the clearance between the feed dogs and needle plate at
the feed start position (when feed dogs are at very front) should be 0.5 to 1.0 mm (refer to illustration).
ADJUSTMENT
1. Put the machine in test mode and select pattern .
2. Loosen the screw securing the horizontal feed plate.
3. Align the feed dog’s left/right position.
4. Tighten the screw securing the horizontal feed plate.
5. Turn the balance wheel and move the feed dogs to the feed start
position.
6. Loosen the screw securing the horizontal feed arm.
7. In the test mode, set the clearance between the feed dog and needle plate to 0.5 to 1.0.
8. Tighten the screw securing the horizontal feed arm.
9. After adjustment, press the thread cutter button and check that the thread cutter operates correctly. If the
thread cutter does not operate correctly, adjust the feed dogs back a bit.