Singer Centurion 121D200A - HOOK LUBRICATION TESTING

TO TEST HOOK LUBRICATION
Thread machine and sew 3 yards of scrap material. Pay no attention to stitch quality or
amount of oil at this time. Remove material and bed slide. Run machine approximately
one minute to establish a,uniform oil flow. Without stopping machine, hold a piece of
paper in place under hook for 10 seconds. Remove paper and compare oil pattern with
Fig. B for proper oil flow.
••• , " • # • ♦ •
FIG. B
If there is no trace of oil or an excess, adjustment should be made with the oil metering
screw, in order to gain access to oil metering screw, the hook should be in position as
shown in Fig. C. Turn oil metering screw clockwise for more oil and counterclockwise for
less (Fig. D). Normal setting is made by turning metering screw to maximum in position
and backing out 2-1 /2 turns. Less than 2-112 turns may be required for long continuous
runs.
FIG. C
Oil Metering
Screw
Hook Shaft
Bushing
Oil
Filter
More Oil
FIG. D
Oil Metering
Screw
Less Oil
From the library of: Superior Sewing Machine & Supply LLC