ELNA 7200 Service Manual page 14

TO ADJUST THE BACKLASH OF HOOK DRIVE AND LOWER SHAFT GEARS
THE GEARS TURNS SMOOTHLY AND ROTARY PLAY OF THE HOOK SHOULD BE 0.8 MM OR
LESS (F) WHEN THE TIP OF HOOK (E) IS WITHIN THE WIDTH OF THE FEED DOG (C) AS
SHOWN BELOW.
LOWER SHAFT BUSHING
B
HEXAGONAL SOCKET SCREW (D)
WIDTH OF THE FEED DOG (C)
A
TIP OF HOOK (E)
0.8 MM OR LESS
1 REMOVE THE MACHINE BASE (REFER TO PAGE 2)
2 REMOVE THE NEEDLE, NEEDLE PLATE AND
BOBBIN HOLDER.
3 LOOSEN THE HEXAGONAL SOCKET SCREW (D).
4 IF THE BACKLASH IS TOO MUCH, TURN THE LOWER
SHAFT BUSHING IN DIRECTION A.
IF THE BACKLASH IS TOO LITTLE, TURN THE LOWER
SHAFT BUSHING IN DIRECTION B.
5 TIGHTEN THE HEXAGONAL SOCKET SCREW (D).
6 ATTACH THE NEEDLE, NEEDLE PLATE AND BOBBIN
HOLDER.
7 ATTACH THE MACHINE BASE.
NOTE: AFTER ADJUSTING THE BACKLUSH, BE SURE
TO CHECK AND ADJUST THE "HOOK TIMING"
AND THE "FEED DOG HEIGHT" (REFER TO
PAGES 10 AND 15).
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