20
(E)
(F)
(C)
(D)
(B)
(A)
Check the play
(D)
Groove of lower shaft bushing
(E)
(F)
Lower shaft gear
MECHANICAL ADJUSTMENT
BACKLASH ( LOWER SHAFT GEAR )
TO CHECK:
1.
Remove the needle plate and bobbin holder.
2.
Turn the hand wheel slowly toward you until the tip of the shuttle hook (A) is between both
ends (b) of the feed dog.
3.
Rotate the hook race clockwise and counter clockwise by hand and check the play.
It should be within 0.8 mm.
* If there is more than 0.8 mm backlash between the gears, adjust as follows.
ADJUSTMENT PROCEDURE:
1.
Remove the bed cover (See page 5) and loosen hexagonal socket screw (C).
2.
Turn the lower shaft bushing (eccentric bushing) (D) in direction of (E) when the play at the
shuttle hook tip is too small.
3.
Turn the lower shaft bushing (eccentric bushing) (D) in direction of ( F ) when the play at the
shuttle hook tip is too large.
4.
Tighten hexagonal socket screw ( C ) securely after 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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