UnionSpecial 31200AQ64Z6, Adjusting Instructions And Illustrated Parts List

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LOOPER THREAD TAKE-UP:
The double disc take-up must be set into the middle of the cast-off
plate slot. It is located on the left side of the crank shaft and is
adjustable with two set screws (see sketch). The looper thread cam
should be set so that the looper thread casts off the high lobe of
the cam as the point of the needle is 1/64" below the under side of
the looper as the looper moves to the left.
THREAD GUIDES OF THE CAST-OFF PLATE:
On the right and left side of the double disc take-up on the cast-off
plate there are adjustable thread eyelets. These eyelets must be set
as close as possible to the double disc take-up. Adjusting these
eyelets toward the operator results in more looper thread in the
system, and when moving them in the opposite direction less
looper thread will be drawn.
LOOPER THREAD RETAINING FINGER:
The looper thread retainer No. 31104 is adjustably mounted on the cast-off plate support. It should be set
laterally so that it is midway between the two discs of the take-up. The height of the retainer affects the
control of the looper thread as the looper moves to the right. More looper thread is given to the stitch when
the retainer is raised. However, if the retainer is raised too high, the looper thread may be wiped under the
looper blade causing triangle skips or pulled down stitches. This can be checked by observing the action of
the looper thread as the looper moves to the right.
NEEDLE THREAD CONTROL:
The frame eyelet No. G52758 located on the left side of the needle lever stud can be adjusted to get the
required amount of needle thread. Raising the left side of the frame eyelet puts less thread in the stitch.
Needle thread strike off should be set flush with bottom of thread holes in needle thread eyelet when needles
are at bottom of stroke.
THREAD TENSION:
The tension of the needle threads and looper threads should be sufficient to produce uniform stitches.