AMF S-4000 - Clamp Plate and Feed Adjustments

1-44
S-4000
Revised 01/2005
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Clamp Plate Zero Position For Machine BH
When the machine stops and starts in the same location each time, the possibility of producing
buttonholes with gaps is eliminated (between a bar and the first stitch). To achieve consistent stopping and
starting positions, the clamp plate must be correctly adjusted for zero position.
Note: Manual machine rotation is required to perform the settings,
setting up for a shorter stitch length will reduce the amount of manual
rotating.
With the machine in the home position, remove the needle and knife. Remove the seven screws securing the
cover plate and remove the plate.
Loosen the two screws securing the stop and position the stop out of the way.
Note: Since the cover is removed, manually secure the clamp plate when running the machine.
Manually engage and rotate the machine until the drive spring releases from the left shifter spring.
The moment the drive spring releases, stop rotating and tilt the machine back. Ensure a minimum .05 mm,
exists between the shifter plate and the casting boss.
If incorrect:
Remove the two screws and the left shifter spring. Loosen the two left shifter arm screws connected
to the block. Position the arm to the right, moving the shifter plate closer to the boss, or to the left to
position the shifter plate farther from the boss, when the drive spring releases, Figure A.
Note: The left spring must be installed, to check for the correct position. When installing the left
shifter spring, ensure the right side of the spring is even with or past the left arm shifter. If the spring
is in front of the shifter arm, the arm will lock up when trying to disengage.
CAUTION! If the shifter is located too far to the right, the drive spring will not release and the
machine will continue to sew in one spot, without feeding.
ADJUSTMENTS
Figure A
Left shifter
arm spring
Left shifter arm
Left shifter
block
Right shifter
arm spring
Right
shifter arm
Right
shifter block
Casting
boss
Shifter
plate
Clearance
NO GO GO