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SETTING THE FEED DOGS FOR DIFFERENTIAL FEED
If adjustment is necessary loosen screw (E, Fig. 11A) in feed
dog support (C) and move as required. Retighten screw (E).
The differential feed dog (A) may then be leveled with main
feed dog (B). If adjustment is necessary loosen screw (F) and
move feed dog up or down as required. Retighten screw (F).
NOTE:
Should the main feed dog require repositioning due
to contact with the throat plate in its forward or
rearward travel, loosen set screw (C, Fig. 10A) in
main feed bar driving link (D), rotate main feed bar
eccentric driving stud (E) as required. Driving stud
(E) has a thin hexagon head with cutouts on two of
the flats allowing movement by tapping with a sharp
pointed tool, when wrench 21388AZ is not available.
Whenever the main feed bar eccentric driving stud
position has been changed, recheck rear needle
guard setting, adjustment may be required. Retighten
set screw (C). Position main feed dog support (C,
Fig. 11A) flush against bottom of main feed dog (B),
tighten support screw (E) securely.
CHANGING STITCH LENGTH
When change in stitch length is required, remove large plug
screw (A, Fig. 12). Loosen feed rocker driving link screw (B) in lever
(C). Moving the feed rocker driving link up in the lever slot
lengthens the stitch, moving it down, shortens the stitch. Re-
tighten link screw (B) securely and replace plug screw (A).
NOTE:
If plug screw (A) is replaced with a new plug screw,it
should be sealed with a silicone seal.
Any stitch length change, requires resetting the needle
guard.
CAUTION:
When making stitch length adjustment do not
exceed maximum recomended stitch length
due to possible part damage.
SETTING REAR NEEDLE GUARD
Set the rear needle guard (A, Fig. 13) horizontally so that it
barely contacts needles (B) when at its extreme forward posi-
tion. If adjustment is necessary loosen screw (E) and move
guard front to back as required. It should be set vertically as
low as possible, yet have its guarding surface in contact with
the needles until the points of the loopers (C), moving to the
right, are even with the right side of the needles. If adjustment
is necessary loosen screw (F) and move guard and holder up or
down as required.
CAUTION:
If stitch length is changed, needle guard must be
reset.
NOTE:
When installing the needle it should be parallel with
the eye in line of feed. If adjustment is necessary,
loosen screw (N, Fig. 15) in needle head and rotate
needle to attain adjustment (D, Fig. 13).
(CONT.)
A
B
B
D
13
C
Plain Feed
FIG. 11
C
A
E
F
Differential Feed
FIG. 11A
FIG. 12
FIG. 13
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