D
C
B
55
53
54
Scan to watch a video
on how to replace
the Posi-Pin�
1�
Remove the broken Posi-Pin and discard it (
53
)�
2�
Insert a new Posi-Pin into one of the
holes in the balance wheel�
3�
Maintain light pressure on the Posi-Pin and rotate
the balance wheel toward you until the Posi-Pin locks
into a mating hole in the balance wheel bushing�
4�
Push the new Posi-Pin all the way in until the shoulder
(
A
) is flush against the balance wheel face.
5�
Tilt the machine back and remove the retaining ring (
B
),
bobbin case (
C
) and gib hook (
D
)� Check both parts
for burrs or damage from a needle strike (p� 38,
57
)�
6�
Remove any burrs by polishing the parts with emery
paper or a fine file. Or replace if badly damaged.
7�
Install a new needle and you are ready to keep sewing�
If Posi-Pin
®
Safety Shear Breaks
The Posi-Pin Safety Shear is designed to break at the shear
point to protect the machine from internal damage or timing
issues when you hit something you shouldn’t while sewing.
The pins are intended to be sacrificial, and replacing a
broken one is easy�
A
Removing the Hook to Clean the Shuttle
Race Guide Shaft & Free Thread Jams
Perform these steps with care:
1�
Move the needle to its highest point�
2�
Remove the bobbin case and bobbin�
3�
Turn each lever (
E
) 1/2 turn away from the retaining ring (
B
)�
4�
Pull the axle of the hook to remove retaining ring (
B
) and gib hook (
D
)�
5�
Gently remove the accumulated lint and thread from the retaining ring (
B
), hook (
D
)
and driver (
F
)� Use a small brush to clean the parts or blow out the debris�
6�
Replace hook (
D
) opposite driver (
F
)� The hook just
rests in place� Be sure the axle is facing out�
7�
Replace retaining ring (
B
) so that both pins are
under the black levers (
E
) when turned�
8�
Replace the bobbin and bobbin case
before beginning to sew�
Scan to watch a video on
how to clean the shuttle�
F
E
B
Gib Hook Axle
D
35 |
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Ultrafeed
®
LSZ Guidebook
| 36
