Backlash (Lower Shaft Gear) - Janome HD718 Service Manual

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.
(E)
(F)
(C)
MECHANICAL ADJUSTMENT
(D)
Lower shaft gear
(F)
(B)
(D)
Groove of lower shaft bushing
(E)
20
(A)
Check the play