Button Hole; Motor Belt Tension - JUKI HZL-30Z Service Manual

4-19 Button hole

Remove the cover for adjusting the button hole.
How to adjust

4-20 Motor belt tension

Remove the front cover. (Similarly, the face cover, bottom cover and rear cover)
How to adjust
Bar tacking adjustment
1. Use the button hole foot and sew a button hole.
2. Turn the adjusting screw located at the upper left side from the hole for adjusting the
button hole with a screwdriver so that the feed amount of bar tacking should be 0 to
1.5 mm.
Turn the adjusting screw clockwise
Turn the adjusting screw counterclockwise
Feed pitch adjustment
1. Use the button hole foot and sew a button hole.
2. Turn the adjusting screw located at the lower right side from the hole for adjusting the
button hole with a screwdriver so that the feed pitch of the stitches on the right and
left sides should be equal.
If the adjusting screw is turned, the feed pitch of the stitches on the right side will
vary. In this case, set the pitch to the feed pitch of the left side.
Turn the adjusting screw clockwise
Turn the adjusting screw counterclockwise
Bar tacking
1. Loosen the setscrew of the motor belt and move up or down together with the motor
bracket to adjust the belt tension.
Excessive tension
Insufficient tension
Increase the feed amount.
Increase the feed pitch of the stitches
on the right side.
Reducion of max. sewing speed, excessive power
consumption, excessive vibration and excessive
rotation noise.
Belt-slip
-17- -17- -17- -17- -17-
Reduce the feed amount.
Reduce the feed pitch of the
stitches on the right side.
Feed pitch