UnionSpecial 53700B Adjusting Instructions And Illustrated Parts List page 10

INITIAL SETTINGS OF UPPER RUNNING FEED MECHANISM
The top feed eccentric assembly should be located on the main shaft so that the first screw in the
eccentric will be in a perpendicular position to the mainshaft when the needle bar has risen 1/4 inch
from the bottom of its stroke, with the handwheel turned in the operating direction.
NOTE: Eccentric may need to be advanced or retarded to obtain proper feeding between top and
bottom feeds.
NOTE: The next two paragraphs refer to the maximum height setting of the top feed mechanism
which can be lowered later to suit sewing conditions.
Fig. 5
the throat plate. Then tighten nut (B) securely.
The bell crank lever ball joint (A, Fig. 7) should be in the
center of the upper feed bell crank lever (B). The ball joint
may need to be moved slightly to meet sewing conditions.
Fig. 7
As the needle bar just begins to rise from the bottom
of its stroke, the distance between the rear of the
needle bar (A, Fig.8) and the front of the upper feed
bar (B) should be 1 3/32 inch (Fig. 8).
be made by loosening screw (C) in the upper feed
driving lever (D) and moving it forward or rearward as
required and retighten screw (C).
Turn handwheel in the
operating direction until the
needle bar is at the bottom
of its stroke. Loosen nut (B,
Fig.6), and move upper feed
lift driving lever (A) so that
the teeth of the upper feed
dog is 5/32" (7.9mm) for style
53700B and 3/16" to 13/64"
(4.8 to 5.2mm) for style
53800B, above the top of
Adjustment can
10
Fig. 6
Fig. 8