UnionSpecial 53700B, Adjusting Instructions And Illustrated Parts List

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SETTING THE LOOPER (CONTINUED)
The looper is set correctly front to back, as it moves to the left behind the needle, when its point passes
as close as possible without contacting the needle (.001-.002). If adjustment is necessary, loosen screw
(E, Fig. 2) in looper rock shaft arm (F), reposition looper as required and retighten screw (E).
SETTING HEIGHT OF NEEDLE BAR
The height of the needle is correct when the top of its eye is
1/64 inch below the underside of the looper, when the
looper point is flush with the left side of the needle. If adjust-
ment is necessary, loosen screw (A, Fig. 3) and move needle
bar (B) up or down as required and retighten screw (A).
SETTING THE FEED DOG
Set the feed dog (A, Fig. 4) in the throat plate so there is equal clearance on all sides. See that the tips
of the teeth extend 1/2 to 1 full tooth above the throat plate and are parallel with the throat plate at
high point of travel. Height can be set by loosening feed dog attaching screw (B) and adjusting feed
dog supporting screw (C). Parallelism can be set by loosening nut (D) and rotating feed dog holder
adjusting screw (A, Fig. 5), as required and retighten nut. Side clearance can be set by loosening screws
(E, Fig. 4) and moving feed rocker (F) to the right or left, as required.
NOTE: Whenever the feed rocker has been moved, always check to assure that the feed rocker a r m
(G) does not bind.
End clearance can be set by loosening screws (H) in the feed rocker arm (G) and moving feed rocker
(F) forward or backward as required.
Fig. 3
Fig. 4