14
MECHANICAL ADJUSTMENT
BACKLASH (BETWEEN LOWER SHAFT GEAR AND 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 width. If play
exceeds 0.8 mm, adjust as follows.
ADJUSTMENT:
1. Remove the bed cover (see page 4).
2. Loosen the setscrew.
3. Turn the lower shaft bushing (eccentric bushing) clockwise (B) if there is too much play in the hook race.
Turn the lower shaft bushing (eccentric bushing) counterclockwise (A) if there is too little play in the hook race.
4. Tighten the setscrew securely after adjustment and install the bed cover.
NOTE:
After adjusting the backlash, be sure to check the needle to hook timing and the feed dog height.
Backlash allowance
Point of hook
Check the backlash
Groove
Groove on the lower
shaft bushing
Lower shaft gear
A
B
Setscrew
Hook gear
