MECHANICAL ADJUSTMENT
BACKLASH (BETWEEN LOWER SHAFT GEAR AND SHUTTLE HOOK GEAR)
JOG THE HOOK RACE BACK AND FORTH TO CHECK ROTARY PLAY.
THE STANDARD PLAY SHOULD BE 0.8 MM (0.03") OR LESS WHEN THE HOOK POINT IS WITHIN THE
FEED DOG WODTH. IF PLAY EXCESS 0.8 MM, ADJUST AS FOLLOWS.
ADJUSTMENT:
1. REMOVE THE BED COVER (SEE PAGE 5).
2. LOOSEN THE SETSCREW.
3. TURN THE LOWER SHAFT BUSHING (ECCENTRIC BUSHING) CLOCKWISE (B) IF THERE IS TOO
MUCH PLAY IN THE SHUTTLE HOOK.
TURN THE LOWER SHAFT BUSHING (ECCENTRIC BUSHING) COUNTERCLOCKWISE (A) IF THERE
IS TOO LITTLE PLAY IN THE SHUTTLE HOOK.
4. TIGHTEN THE SETSCREW SECURELY AFTER ADJUSTMENT AND INSTALL THE BED COVER.
NOTE
AFTER ADJUSTING THE BACKLASH, BE SURE TO CHECK THE NEEDLE TO SHUTTLE TIMING
AND THE FEED DOG HEIGHT.
BACKLASH ALLOWANCE
POINT OF
SHUTTLE HOOK
CHECK THE
BACKLASH
GROOVE
GROOVE ON THE LOWER
SHAFT BUSHING
LOWER SHAFT GEAR
A
B
SETSCREW
SHUTTLE HOOK GEAR
14