11
MECHANICAL ADJUSTMENT
NEEDLE SWING
TO CHECK:
If the needle bar starts sideways while the needle is in the fabric at sewing the zigzag pattern,
adjust the needle swing:
(The needle should start swinging when 2 to 3mm above the needle plate.)
ADJUSTMENT PROCEDURE:
1.
Remove the top cover (See page 4), set the pattern selector dial at " " and select the
maximum zigzag width.
2.
Loosen the two hexagonal socket screws on the upper shaft worm.
3.
Adjust the needle swing by turning the handwheel, while holding the worm so as not to rotate
it, until the needle swing starts at 2 to 3 mm above the needle plate after the needle has came
from the right side of the needle hole.
4.
Tighten the two hexagonal socket screws on the upper shaft worm.
5.
Attach the top cover (unit).
NOTE: For removal and replacement of the top cover (unit), see to page 2. After the
adjustment of the timing of lateral needle swing, make sure that there is no backlash
between the upper shaft worm and the other gear without any backlash between
them.
Upper shaft
worm
Hexagonal
socket screw
Gear
The backlash
is decreased.
The backlash
is increased.
(NOTE)
If the upper shaft worm deviates
laterally when turning the upper
shaft, the backlash between the
gears will change.
2-3 mm
(Right outflow start position)
Summary of Contents for HD718
Page 1: ...SERVICE MANUAL PARTS LIST MODEL HD718 First Edition 19 May 2017...
Page 33: ...PARTS LIST...
Page 42: ...40 MODEL HD718 PARTS LIST 1 2 3 4 5 6 7 8 9 10 11 12 16 9 13 14 15 18 17 20 24 23 21 23 22 19...
Page 44: ...42 MODEL HD718 PARTS LIST 1 4 2 5 3 6 8 9 20 19 18 17 15 13 12 11 10 16 21 4 7 5 11 14...
Page 54: ...52 MODEL HD718 PARTS LIST 1 2 3 4 5 8 17 12 14 6 10 11 13 15 20 16 9 7 19 18...
