Singer Centurion 121D200A - Page 35

ASSEMBLY SEQUENCE
NEEDLE BAR FRAME AND THREAD TAKE-UP MECHANISM
1. Mount and fasten throat plate to bed casting.
2. Take complete unit, as shown In Fig. B, and insert into arm casting with studs No. 1, 2
and 3 entering simultaneously. Make certain that the slotted portion of the needle bar
crank spacer, on stud No. 3, aligns with pin in counterbalance. Flats on all studs must
be positioned relative to its locking set screws.
3. Locate frame and take-up unit so as to have the sewing needle positioned dead
center into the throat plate needle hole. Lock studs No. 1 and 2 in place with set
screws provided.
4. insert thread take-up stud, with flats facing upward, through t^ke-up mechanism into
arm casting and lock in place with both set screws.
5. Snug needle bar crank set screw on flat and snug needle bar crank pinch screw.
Loosen set screw. Tighten pinch screw and set screw in that order.
6. insert oiling wick through hole in casting, through felt pad, back through hole in cast
ing into take-up stud.
7. Wrap sucker wick around presser bar bushing, behind needle bar frame, around
frame and under felt pad retaining springs at bottom, behind presser bar bushing.
-C21
FIG. A
FIG. B
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From the library of: Superior Sewing Machine & Supply LLC