11
DC4030P
MECHANICAL ADJUSTMENT
BACKLASH (BETWEEN LOWER SHAFT GEAR AND HOOK DRIVE 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 3).
2. Loosen the setscrew.
3. Turn the lower shaft bushing (eccentric bushing) clockwise (B) if there is too much play in the hook.
Turn the lower shaft bushing (eccentric bushing) counterclockwise (A) if there is too little play in the
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 hook timing and the feed dog height.
Backlash allowance
Point of shuttle hook
Check the backlash
Groove
Setscrew
Groove on the lower shaft bushing
Lower shaft gear
A
B
Shuttle hook gear
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