17
CLEARANCE BETWEEN NEEDLE AND HOOK
The clearance between the test pin and the tip of the hook should be between –0.10 and +0.05 mm.
PREPARATION:
1.
Turn on the power switch and set the stitch pattern to maximum zigzag width " ".
2.
Remove the needle plate (A) and bobbin holder (B), insert the test pin (C) into the needle bar and
push it up until it stops, then tighten the needle clamp screw.
3.
Remove the bed cover (See page 5).
ADJUSTMENT:
1.
Loosen the setscrews (D) and (E), then lightly loosen the setscrew (F).
2.
Turning the handwheel toward you slowly by hand, move the hook setplate up or down to adjust
the clearance between the test pin (C) and the point of the hook to -0.10 to +0.05 mm.
Repeat the procedure for both the left and right needle positions.
3.
Tighten the setscrews (D), (E) and (F) securely.
4.
Check the backlash of the hook gear and the lower shaft gear.
If the backlash is too large or small, adjusted the backlash (See page 20).
5.
Attach the bed cover.
6.
Remove the test pin (C), then attach the bobbin holder (B) and the needle plate (A).
Test pin (C)
–0.10 to +0.05mm
Point of hook
Setscrew (F)
Hook set
plate
Setscrew (D)
Setscrew (E)
Needle plate (A)
Bobbin holder (B)
MECHANICAL ADJUSTMENT
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...
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