Check the Rotational Timing of the Shuttle Gib Hook
The shuttle gib hook (p. 55,
16
) is driven by the shuttle driver (
15
). To change the rotation of the
hook, the driver must be repositioned on the lower shaft (
14
).
1.
Turn the balance wheel so the gib
hook point is at its furthest position
counterclockwise (
42
).
2.
Measure the distance between the gib
hook point and the needle. The driver
is correctly positioned when the point is
between 1/8" and 3/16" counterclockwise
of the needle (
A
).
If spaced properly, the driver is set
correctly. If not, continue on to adjust
the driver.
3.
The driver is secured to the lower shaft
with two set screws (
43
). Loosen the
screws (
B
) and gently twist the shuttle
driver. Keep the driver from sliding left or
right on the shaft. If the fit is tight, carefully
use a screwdriver as leverage.
After adjusting the rotational timing
of the gib hook, you may need to
adjust the rotational positioning of the
shuttle race guide shaft or the left-right
positioning of the shuttle gib hook.
Check the Rotational
Positioning of the Shuttle
Race Guide Shaft
Before making any adjustments to the left-
right positioning of the shuttle assembly,
check the rotational positioning of the shuttle
race guide shaft.
1.
Remove the needle plate (p. 49,
18
)
and feed dog (p. 57,
17
or
19
)
2.
Remove the bobbin case and hook,
re-install the retaining ring
.
3.
Rotate the balance wheel until the needle
enters the shuttle (
44
).
If positioned properly, the needle is
centered in the “triangular” opening of
the retaining ring cap spring from front
to back (
C
).
If not, you'll need to adjust the
rotational positioning of the shuttle
race guide shaft.
4.
Loosen the compressible timing clamp
screw (p. 46,
46
D
)
just a little.
5.
Twist the shuttle race guide shaft carefully
without moving it left or right. If it will not
move, loosen the compressible timing
clamp screw a little more.
6.
Verify that the needle is now positioned
correctly within the retaining ring cap
spring.
7.
Tighten the compressible timing clamp
screw.
42
43
A
B
C
44
Ultrafeed
®
Guidebook: Troubleshooting the Ultrafeed®
44
43
www.sailrite.com
