Check the Left-Right Positioning
of the Shuttle Gib Hook
If the shuttle assembly and lower shaft have
slipped left or right of the factory setting, the gib
hook will not be in position to catch the loop.
1.
Re-install the gib hook (p. 30)
2.
Make sure you have a #20 needle
installed.
3.
Set the machine in straight stitch, center
the needle (LSZ-1 only), and grab a
flashlight.
4.
Remove the presser foot, needle plate and
feed dog.
5.
Looking from the top down in to the
machine (
45
), slowly rotate the balance
wheel. As the gib hook swings past the
needle, the hook should be as close as
possible to the right side of the needle
without deflecting it (
A
).
If the gap between the needle and the
hook is too large, the hook must be
moved to the left to close the gap.
If the needle is being deflected by the
hook, then the hook must be moved to
the right.
Adjusting the Left-Right Positioning of the Shuttle Gib Hook
1.
Set the machine to straight stitch.
2.
Make a mark on the cast iron bearing
surface next to the large oil hole
(
46
B
) in the shuttle race guide shaft (
C
).
If the shaft should accidentally rotate,
realign the mark with the oil hole.
3.
Loosen slightly the compressible timing
clamp screw (
D
) on the compressible
timing clamp that drives the entire
assembly back and forth with the zigzag
movement of the needle. Incrementally
loosen the screw until light taps will
move the shuttle assembly (
E
) in either
direction.
4.
Carefully move the assembly to position
the hook as close to the needle as
possible without deflecting (p. 45,
45
).
5.
With the mark on the bearing surface and
oil hole aligned, tighten the compressible
timing clamp screw (
D
).
Applies to LSZ-1 Model Only
>
For the sake of clarity (
45
) shows the machine
without the retaining ring installed. While this
makes it easier to see the timing, the hook
must be held in place with light finger pressure
to keep it from falling out of the shuttle
assembly when rotating the balance wheel.
A
45
46
D
C
D
B
E
Ultrafeed
®
Guidebook: Troubleshooting the Ultrafeed®
46
45
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