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Chapter 8 Standard Adjustment
BES-941BC • BES-1241BC
149
1. Dismount the pulley cover and turn the pulley B q until the pulley scale indicates 180˚ and
the needle bar is set at the lowest position. (The pulley B "
" mark and the stop mark " "
are aligned.)
2. Insert the positioning bar w into the hole of the pulley q and fix the drive shaft.
Note) Turn the pulley B securely in the clockwise direction to eliminate a backlash.
3. Loosen the needle bar clamp set screw e and the bolt u of the top dead center stopper t
when the needle tip is positioned 10.8 mm above the center of the rotary hook shaft. Adjust
the position of the needle bar thread guide so that the set screw r on it is turned to the right
by 25 ~ 30˚. Tighten the needle bar clamp set screw e securely.
Note) When tightening the needle bar clamp set screw e, the hole in the needle bar guide should face the front.
4. After adjustment is finished, remove the positioning bar w.
5. Set the needle bar at the highest position (where the pulley B indication mark "
" and the
cover indication mark "
" are aligned). Lightly press the top dead center stopper t toward
the cushion rubber y, and tighten the top dead center stopper bolt u while pressing down
the needle bar clamp so that it faces the front.
Note) • Make sure that the top dead center stopper does not hit the needle bar guide rail i at this time.
• When tightening the upper dead point stopper bolt u, insert the longer side of the attached wrench into
the bolt and tighten it by using the shorter side.
Excessive tightening may make the needle bar movement sluggish.