≈ 5/8"
Check the Needle Bar Height
1.
Remove the left end cover of the sewing
machine as shown (
41
).
2.
Manually lower the needle bar to its lowest
position by turning the balance wheel
toward you.
3.
We mark the proper height of the needle
bar for your machine by putting a small
scratch on the needle bar (
A
). Check to
see if the mark is level with the top surface
of the upper needle bar guide.
You can also determine the proper height
by measuring the distance between the
top of the needle eye and the gib hook
when the gib hook is directly behind the
needle and the needle is on its way up.
The distance should measure between 0
and 1/32" (
B
).
If aligned properly, the needle bar is set
correctly. If not, continue on to adjust
the needle bar height.
4.
Manually operate the machine to move
the needle bar to the bottom of its stroke
(all the way down). Unlock the needle
bar from the drive collar by loosening
the set screw located either in the front
or the side of the pillow block (
C
). If the
screw is in the side of the pillow block,
it can be accessed through a hole in the
machine casting (
D
). Use a 1/8" flat blade
screwdriver to loosen. Do not use the
screwdriver that comes with the machine,
it is not a proper fit.
5.
With the needle bar at the bottom of its
stroke, reposition the needle bar so the
mark lines up with the top surface of the
upper needle bar guide. Gently twist the
needle bar up or down to position the
mark making sure the screw that secures
the needle is facing the inside of the
sewing machine arm. Tighten the drive
collar set screw.
If your Ultrafeed
®
is still not performing
properly after adjusting the needle bar
height, proceed to check the rotational
timing.
0–1/32"
D
A
C
41
B
Ultrafeed
®
Guidebook: Troubleshooting the Ultrafeed®
42
41
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