15
ADJUSTMENT OF HOOK TIMING
With the needle bar swung to the left at the maximum zigzag width, the amount of ascending
travel of the needle bar from its lower position to the position where the tip of the rotary hook
exactly meets the right side of the needle should be 3.15 to 3.45 mm.
Before the adjustment, be sure to check the needle bar height.
(1) Remove the needle plate, bobbin holder and bed cover.
(2) Set the pattern selector dial at “ “ and select the maximum zigzag width.
(3) Loosen the two set screws of the lower shaft gear.
(4) Turn the balance wheel toward you to move up the needle bar 3.15 to 3.45 mm from its
lowest position with the needle swung to the left.
(5) While holding the balance wheel by hand to prevent the needle bar from moving, turn the
upper shaft gear in the arrow direction until the tip of the rotary hook exactly meets the right
side of the needle.
(6) Taking care not to affect the relationship between the rotary hook tip and the needle, tighten
the two set screws of the lower shaft gear.
(7) Attach the bed cover, bobbin holder and needle plate.
Summary of Contents for HD3000
Page 1: ...SERVICING MANUAL HD 3000...
