JUKI MF-7700D Series Engineer's Manual page 43

Adjustment Procedure
4. Longitudinal position of the feed dog (condition : feed momentum
3.6 mm (maximum))
(1) When fixing setscrew
from the edge of the slot of the throat plate to the front face of the
main feed dog to 0.6±0.2 mm when the feed dog travels to the
extreme front position (operator's side), press the main feed lever to
the rocking bar side, and fix it with setscrew.
(2) When fixing setscrew
differential feed ratio to 1 : 1, adjust the clearance provided between
the main feed dog and the differential feed dog to 1.6±0.2 mm, press
the differential feed lever to the rocking bar side, and fix it with
setscrew.
(Caution) When the adjustment value changes greatly, feed dog
or throat plate will be broken.
5. For C10
Front and rear positions of the feed dog
(1) When the main feed dog has a pitch of 3.6mm, the clearance
between the most advanced position of feed (worker side) and the
throat plate shall be 0.6 ± 0.2mm.
(2) When the differential feed dog has a pitch of 2.5mm and the
differential feed ratio is 1:1 at that time, the clearance between the
main feed dog and the differential feed dog shall be 1 ± 0.2mm.
in the main feed lever, adjust the clearance
in the differential feed lever, set the
– 39 –
Results of Improper Adjustment
o When the fixing position of the
main feed lever slips greatly out
of position, abnormal noise or
abrasion will be caused.
o When the fixing position of the
differential feed lever slips greatly
out of position, abnormal noise
or abrasion will be caused.