ELNA eXperience 520, Руководство по обслуживанию

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14
MODEL 520
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
width. 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.
NOTES:
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