Singer Sewing Machine Instruction Manual page 22

Moving the Hook Closer to the Needle
To adjust the hook to the left is done by
loosening the compressible clamp screw and moving the
shaft to the left. The shaft, hook and shuttle all move
together. Rotate the balance wheel so that the hook is at its
highest point at the top, where is crosses the
needle. Leave the retaining ring off. Move the shaft to
get the hook as close to the needle as possible without
actually touching it. Make sure to align the clamp gap with
the reference mark made earlier. Make sure the clamp is
still all the way left, fi rmly against the cast iron foot, then
tighten the clamp screw.
Holding the shuttle left, loosen the right collar and
move it all the way right leaving no play. Tighten the two
collar screws. Make sure there is no side–to–side play in
the center shaft.
5) Check the Hook Timing
If the performance of the machine is still off
after adjusting the left and right position of the hook, check
the hook rotation. The hook is driven by the shuttle driver.
The driver must be repositioned on the lower shaft in
order to change the rotation of the hook. There are two set
screws that secure the driver to the lower shaft. Rotating
the driver on its shaft is done by loosening the screws and
twisting the shuttle driver. If the shuttle driver is tight it
is sometimes necessary to use a screwdriver as leverage.
Caution must be taken so that the driver does not slide to
the left or right on the shaft. The shuttle driver is correctly
positioned when the hook point (sharpest point on the hook)
is between 1/8" and 3/16" counterclockwise of the needle.
(See fi g. 16A) The spacing can only be checked when the
machine balance wheel has been turned so that the hook
point is at its furthest position counterclockwise and the
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