Belt Issues
The belts slip or come off the pulleys:
The sewing machine belts may require tension adjustment. The longer belt should be tensioned
to deflect 1/4" when pressed down using a little pressure by your finger (
38
). Tension on the belt
can be adjusted by loosening the bolt (
A
) located directly below the balance wheel. This bolt
attaches the idler pulley (
B
) to the machine. Move the idler pulley up or down to properly tension
the belt and, then, tighten the bolt.
The short belt should appear to be much looser, but its deflection should also be about 1/4" (
39
).
This belt should not require adjustment unless an adjustment to the longer belt has been made. If
adjustment is ever required, slide the idler pulley forward and backward in its slotted bracket. The
pulley shaft (p. 61,
10
) of the idler pulley is pressed flat at its outer end so that it can be rotated
(loosened) with a small wrench. After loosening the shaft, the pulley may be moved to re-tension
the belt. Tighten the shaft to complete the adjustment.
Ultrafeed
®
Timing
The timing of your machine is determined by the relationship of the needle to the gib
hook. The gib hook picks up the upper thread at the needle and carries it down around
the bottom of the bobbin case where the upper thread loop is pulled tight by the take
up arm above the needle bar.
Starting on p. 41, follow these steps to adjust the timing on your Ultrafeed
®
:
About the Class 15
Shuttle Hook System
The Ultrafeed
®
has a class 15 shuttle hook
system. In this system the gib hook oscillates
back and forth around the bobbin case in half
turns (
40
) carrying the upper thread around
the bottom of the bobbin case. Once this is
completed, the hook reverses direction and
returns to its original location. This movement
is geared by a simple yoke and cam
arrangement on the top shaft of the machine.
It is a relatively simple design but is both
reliable and satisfactory for canvas work.
38
39
40
A
B
Ultrafeed
®
Guidebook: Troubleshooting the Ultrafeed®
40
39
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