18 needle to rotating hook relation adjustment – SINGER 191D-30 User Manual
High Speed Straight Lockstitch Sewing Machine
Instruction Manual and Parts List
Adjusting the height of the needle
bar (Figure 27)
Turn the handwheel until the nee-
dle bar has been at the lowest
point, loosen the setscrew ‘1’.
The line ‘A’ on the needle bar ‘2’
align with the bottom end of needle
bar lower bushing ’3’, then securely
tighten the setscrew ‘1’.
Adjusting the position of the rotat-
Loosen two rotating hook set-
screws and turn the handwheel un-
til the line ‘B’ on needle bar align
with the bottom end of needle bar
lower bushing ‘3’.
After the above adjustments steps,
the rotating hook point ‘5’ aligns
with the center of needle ‘4’, and
make sure the clearance between
the needle and the rotating hook
‘5’ is 0.04~0.1 mm.
If the clearance
is too small, the
rotating hook points
will wear out, and
too big, it will cause
the skip stitch.
When replacing the
rotating hook, it
should be using the